mirror of
https://github.com/MarlinFirmware/Marlin.git
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Libraries supporting Marlin platform
This commit is contained in:
Richard Wackerbarth
parent
6c86266fb6
commit
3004359191
@ -0,0 +1,106 @@
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;************************************************************
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; Windows USB CDC ACM Setup File
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; Copyright (c) 2000 Microsoft Corporation
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[Version]
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Signature="$Windows NT$"
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Class=Ports
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ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
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Provider=%MFGNAME%
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LayoutFile=layout.inf
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CatalogFile=%MFGFILENAME%.cat
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DriverVer=11/15/2007,5.1.2600.0
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[Manufacturer]
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%MFGNAME%=DeviceList, NTamd64
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[DestinationDirs]
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DefaultDestDir=12
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;------------------------------------------------------------------------------
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; Windows 2000/XP/Vista-32bit Sections
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;------------------------------------------------------------------------------
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[DriverInstall.nt]
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include=mdmcpq.inf
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CopyFiles=DriverCopyFiles.nt
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AddReg=DriverInstall.nt.AddReg
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[DriverCopyFiles.nt]
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usbser.sys,,,0x20
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[DriverInstall.nt.AddReg]
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HKR,,DevLoader,,*ntkern
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HKR,,NTMPDriver,,%DRIVERFILENAME%.sys
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HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"
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[DriverInstall.nt.Services]
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AddService=usbser, 0x00000002, DriverService.nt
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[DriverService.nt]
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DisplayName=%SERVICE%
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ServiceType=1
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StartType=3
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ErrorControl=1
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ServiceBinary=%12%\%DRIVERFILENAME%.sys
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;------------------------------------------------------------------------------
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; Vista-64bit Sections
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;------------------------------------------------------------------------------
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[DriverInstall.NTamd64]
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include=mdmcpq.inf
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CopyFiles=DriverCopyFiles.NTamd64
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AddReg=DriverInstall.NTamd64.AddReg
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[DriverCopyFiles.NTamd64]
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%DRIVERFILENAME%.sys,,,0x20
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[DriverInstall.NTamd64.AddReg]
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HKR,,DevLoader,,*ntkern
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HKR,,NTMPDriver,,%DRIVERFILENAME%.sys
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HKR,,EnumPropPages32,,"MsPorts.dll,SerialPortPropPageProvider"
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[DriverInstall.NTamd64.Services]
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AddService=usbser, 0x00000002, DriverService.NTamd64
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[DriverService.NTamd64]
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DisplayName=%SERVICE%
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ServiceType=1
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StartType=3
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ErrorControl=1
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ServiceBinary=%12%\%DRIVERFILENAME%.sys
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;------------------------------------------------------------------------------
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; Vendor and Product ID Definitions
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;------------------------------------------------------------------------------
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; When developing your USB device, the VID and PID used in the PC side
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; application program and the firmware on the microcontroller must match.
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; Modify the below line to use your VID and PID. Use the format as shown below.
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; Note: One INF file can be used for multiple devices with different VID and PIDs.
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; For each supported device, append ",USB\VID_xxxx&PID_yyyy" to the end of the line.
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;------------------------------------------------------------------------------
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[SourceDisksFiles]
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[SourceDisksNames]
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[DeviceList]
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%DESCRIPTION%=DriverInstall, USB\VID_16D0&PID_076B
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[DeviceList.NTamd64]
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%DESCRIPTION%=DriverInstall, USB\VID_16D0&PID_204A
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;------------------------------------------------------------------------------
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; String Definitions
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;------------------------------------------------------------------------------
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;Modify these strings to customize your device
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;------------------------------------------------------------------------------
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[Strings]
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MFGFILENAME="CDC_vista"
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DRIVERFILENAME ="usbser"
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MFGNAME="Metrix Create Space"
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INSTDISK="Brainwave Driver Installer"
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DESCRIPTION="Communications Port"
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SERVICE="USB RS-232 Emulation Driver"
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@ -0,0 +1,310 @@
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#include "LiquidCrystal.h"
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include "Arduino.h"
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// When the display powers up, it is configured as follows:
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//
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// 1. Display clear
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// 2. Function set:
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// DL = 1; 8-bit interface data
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// N = 0; 1-line display
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// F = 0; 5x8 dot character font
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// 3. Display on/off control:
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// D = 0; Display off
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// C = 0; Cursor off
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// B = 0; Blinking off
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// 4. Entry mode set:
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// I/D = 1; Increment by 1
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// S = 0; No shift
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//
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// Note, however, that resetting the Arduino doesn't reset the LCD, so we
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// can't assume that it's in that state when a sketch starts (and the
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// LiquidCrystal constructor is called).
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
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}
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
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}
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
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{
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init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
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}
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
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{
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init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
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}
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void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
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{
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_rs_pin = rs;
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_rw_pin = rw;
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_enable_pin = enable;
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_data_pins[0] = d0;
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_data_pins[1] = d1;
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_data_pins[2] = d2;
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_data_pins[3] = d3;
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_data_pins[4] = d4;
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_data_pins[5] = d5;
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_data_pins[6] = d6;
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_data_pins[7] = d7;
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pinMode(_rs_pin, OUTPUT);
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// we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
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if (_rw_pin != 255) {
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pinMode(_rw_pin, OUTPUT);
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}
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pinMode(_enable_pin, OUTPUT);
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if (fourbitmode)
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_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
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else
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_displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
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begin(16, 1);
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}
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void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
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if (lines > 1) {
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_displayfunction |= LCD_2LINE;
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}
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_numlines = lines;
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_currline = 0;
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// for some 1 line displays you can select a 10 pixel high font
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if ((dotsize != 0) && (lines == 1)) {
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_displayfunction |= LCD_5x10DOTS;
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}
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// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
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// according to datasheet, we need at least 40ms after power rises above 2.7V
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// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
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delayMicroseconds(50000);
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// Now we pull both RS and R/W low to begin commands
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digitalWrite(_rs_pin, LOW);
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digitalWrite(_enable_pin, LOW);
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if (_rw_pin != 255) {
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digitalWrite(_rw_pin, LOW);
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}
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//put the LCD into 4 bit or 8 bit mode
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if (! (_displayfunction & LCD_8BITMODE)) {
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// this is according to the hitachi HD44780 datasheet
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// figure 24, pg 46
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// we start in 8bit mode, try to set 4 bit mode
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write4bits(0x03);
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delayMicroseconds(4500); // wait min 4.1ms
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// second try
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write4bits(0x03);
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delayMicroseconds(4500); // wait min 4.1ms
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// third go!
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write4bits(0x03);
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delayMicroseconds(150);
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// finally, set to 4-bit interface
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write4bits(0x02);
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} else {
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// this is according to the hitachi HD44780 datasheet
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// page 45 figure 23
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// Send function set command sequence
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command(LCD_FUNCTIONSET | _displayfunction);
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delayMicroseconds(4500); // wait more than 4.1ms
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// second try
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command(LCD_FUNCTIONSET | _displayfunction);
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delayMicroseconds(150);
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// third go
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command(LCD_FUNCTIONSET | _displayfunction);
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}
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// finally, set # lines, font size, etc.
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command(LCD_FUNCTIONSET | _displayfunction);
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// turn the display on with no cursor or blinking default
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_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
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display();
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// clear it off
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clear();
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// Initialize to default text direction (for romance languages)
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_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
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// set the entry mode
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command(LCD_ENTRYMODESET | _displaymode);
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}
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/********** high level commands, for the user! */
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void LiquidCrystal::clear()
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{
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command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void LiquidCrystal::home()
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{
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command(LCD_RETURNHOME); // set cursor position to zero
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delayMicroseconds(2000); // this command takes a long time!
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}
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void LiquidCrystal::setCursor(uint8_t col, uint8_t row)
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{
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int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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if ( row >= _numlines ) {
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row = _numlines-1; // we count rows starting w/0
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}
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command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
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}
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// Turn the display on/off (quickly)
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void LiquidCrystal::noDisplay() {
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_displaycontrol &= ~LCD_DISPLAYON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void LiquidCrystal::display() {
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_displaycontrol |= LCD_DISPLAYON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// Turns the underline cursor on/off
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void LiquidCrystal::noCursor() {
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_displaycontrol &= ~LCD_CURSORON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void LiquidCrystal::cursor() {
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_displaycontrol |= LCD_CURSORON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// Turn on and off the blinking cursor
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void LiquidCrystal::noBlink() {
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_displaycontrol &= ~LCD_BLINKON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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void LiquidCrystal::blink() {
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_displaycontrol |= LCD_BLINKON;
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command(LCD_DISPLAYCONTROL | _displaycontrol);
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}
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// These commands scroll the display without changing the RAM
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void LiquidCrystal::scrollDisplayLeft(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
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}
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void LiquidCrystal::scrollDisplayRight(void) {
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command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
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}
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// This is for text that flows Left to Right
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void LiquidCrystal::leftToRight(void) {
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_displaymode |= LCD_ENTRYLEFT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This is for text that flows Right to Left
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void LiquidCrystal::rightToLeft(void) {
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_displaymode &= ~LCD_ENTRYLEFT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This will 'right justify' text from the cursor
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void LiquidCrystal::autoscroll(void) {
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_displaymode |= LCD_ENTRYSHIFTINCREMENT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// This will 'left justify' text from the cursor
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void LiquidCrystal::noAutoscroll(void) {
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_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
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command(LCD_ENTRYMODESET | _displaymode);
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}
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// Allows us to fill the first 8 CGRAM locations
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// with custom characters
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void LiquidCrystal::createChar(uint8_t location, uint8_t charmap[]) {
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location &= 0x7; // we only have 8 locations 0-7
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command(LCD_SETCGRAMADDR | (location << 3));
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for (int i=0; i<8; i++) {
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write(charmap[i]);
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}
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}
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/*********** mid level commands, for sending data/cmds */
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inline void LiquidCrystal::command(uint8_t value) {
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send(value, LOW);
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}
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inline size_t LiquidCrystal::write(uint8_t value) {
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send(value, HIGH);
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return 1; // assume sucess
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}
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/************ low level data pushing commands **********/
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// write either command or data, with automatic 4/8-bit selection
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void LiquidCrystal::send(uint8_t value, uint8_t mode) {
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digitalWrite(_rs_pin, mode);
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// if there is a RW pin indicated, set it low to Write
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if (_rw_pin != 255) {
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digitalWrite(_rw_pin, LOW);
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}
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if (_displayfunction & LCD_8BITMODE) {
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write8bits(value);
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} else {
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write4bits(value>>4);
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write4bits(value);
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}
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}
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void LiquidCrystal::pulseEnable(void) {
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digitalWrite(_enable_pin, LOW);
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delayMicroseconds(1);
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digitalWrite(_enable_pin, HIGH);
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delayMicroseconds(1); // enable pulse must be >450ns
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digitalWrite(_enable_pin, LOW);
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delayMicroseconds(100); // commands need > 37us to settle
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}
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void LiquidCrystal::write4bits(uint8_t value) {
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for (int i = 0; i < 4; i++) {
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pinMode(_data_pins[i], OUTPUT);
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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pulseEnable();
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}
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void LiquidCrystal::write8bits(uint8_t value) {
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for (int i = 0; i < 8; i++) {
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pinMode(_data_pins[i], OUTPUT);
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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pulseEnable();
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}
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@ -0,0 +1,106 @@
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#ifndef LiquidCrystal_h
|
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#define LiquidCrystal_h
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|
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#include <inttypes.h>
|
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#include "Print.h"
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// commands
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||||
#define LCD_CLEARDISPLAY 0x01
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||||
#define LCD_RETURNHOME 0x02
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||||
#define LCD_ENTRYMODESET 0x04
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#define LCD_DISPLAYCONTROL 0x08
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#define LCD_CURSORSHIFT 0x10
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#define LCD_FUNCTIONSET 0x20
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#define LCD_SETCGRAMADDR 0x40
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#define LCD_SETDDRAMADDR 0x80
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// flags for display entry mode
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#define LCD_ENTRYRIGHT 0x00
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#define LCD_ENTRYLEFT 0x02
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#define LCD_ENTRYSHIFTINCREMENT 0x01
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#define LCD_ENTRYSHIFTDECREMENT 0x00
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// flags for display on/off control
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#define LCD_DISPLAYON 0x04
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#define LCD_DISPLAYOFF 0x00
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#define LCD_CURSORON 0x02
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#define LCD_CURSOROFF 0x00
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#define LCD_BLINKON 0x01
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#define LCD_BLINKOFF 0x00
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// flags for display/cursor shift
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#define LCD_DISPLAYMOVE 0x08
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#define LCD_CURSORMOVE 0x00
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#define LCD_MOVERIGHT 0x04
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#define LCD_MOVELEFT 0x00
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// flags for function set
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#define LCD_8BITMODE 0x10
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#define LCD_4BITMODE 0x00
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#define LCD_2LINE 0x08
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#define LCD_1LINE 0x00
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#define LCD_5x10DOTS 0x04
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#define LCD_5x8DOTS 0x00
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class LiquidCrystal : public Print {
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public:
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LiquidCrystal(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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||||
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
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||||
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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||||
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
|
||||
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
|
||||
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
|
||||
LiquidCrystal(uint8_t rs, uint8_t enable,
|
||||
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
|
||||
|
||||
void init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
|
||||
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
|
||||
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
|
||||
|
||||
void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
|
||||
|
||||
void clear();
|
||||
void home();
|
||||
|
||||
void noDisplay();
|
||||
void display();
|
||||
void noBlink();
|
||||
void blink();
|
||||
void noCursor();
|
||||
void cursor();
|
||||
void scrollDisplayLeft();
|
||||
void scrollDisplayRight();
|
||||
void leftToRight();
|
||||
void rightToLeft();
|
||||
void autoscroll();
|
||||
void noAutoscroll();
|
||||
|
||||
void createChar(uint8_t, uint8_t[]);
|
||||
void setCursor(uint8_t, uint8_t);
|
||||
virtual size_t write(uint8_t);
|
||||
void command(uint8_t);
|
||||
|
||||
using Print::write;
|
||||
private:
|
||||
void send(uint8_t, uint8_t);
|
||||
void write4bits(uint8_t);
|
||||
void write8bits(uint8_t);
|
||||
void pulseEnable();
|
||||
|
||||
uint8_t _rs_pin; // LOW: command. HIGH: character.
|
||||
uint8_t _rw_pin; // LOW: write to LCD. HIGH: read from LCD.
|
||||
uint8_t _enable_pin; // activated by a HIGH pulse.
|
||||
uint8_t _data_pins[8];
|
||||
|
||||
uint8_t _displayfunction;
|
||||
uint8_t _displaycontrol;
|
||||
uint8_t _displaymode;
|
||||
|
||||
uint8_t _initialized;
|
||||
|
||||
uint8_t _numlines,_currline;
|
||||
};
|
||||
|
||||
#endif
|
||||
@ -0,0 +1,37 @@
|
||||
#######################################
|
||||
# Syntax Coloring Map For LiquidCrystal
|
||||
#######################################
|
||||
|
||||
#######################################
|
||||
# Datatypes (KEYWORD1)
|
||||
#######################################
|
||||
|
||||
LiquidCrystal KEYWORD1
|
||||
|
||||
#######################################
|
||||
# Methods and Functions (KEYWORD2)
|
||||
#######################################
|
||||
|
||||
begin KEYWORD2
|
||||
clear KEYWORD2
|
||||
home KEYWORD2
|
||||
print KEYWORD2
|
||||
setCursor KEYWORD2
|
||||
cursor KEYWORD2
|
||||
noCursor KEYWORD2
|
||||
blink KEYWORD2
|
||||
noBlink KEYWORD2
|
||||
display KEYWORD2
|
||||
noDisplay KEYWORD2
|
||||
autoscroll KEYWORD2
|
||||
noAutoscroll KEYWORD2
|
||||
leftToRight KEYWORD2
|
||||
rightToLeft KEYWORD2
|
||||
scrollDisplayLeft KEYWORD2
|
||||
scrollDisplayRight KEYWORD2
|
||||
createChar KEYWORD2
|
||||
|
||||
#######################################
|
||||
# Constants (LITERAL1)
|
||||
#######################################
|
||||
|
||||
@ -0,0 +1,66 @@
|
||||
/*
|
||||
* Copyright (c) 2010 by Cristian Maglie <c.maglie@bug.st>
|
||||
* SPI Master library for arduino.
|
||||
*
|
||||
* This file is free software; you can redistribute it and/or modify
|
||||
* it under the terms of either the GNU General Public License version 2
|
||||
* or the GNU Lesser General Public License version 2.1, both as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include "pins_arduino.h"
|
||||
#include "SPI.h"
|
||||
|
||||
SPIClass SPI;
|
||||
|
||||
void SPIClass::begin() {
|
||||
|
||||
// Set SS to high so a connected chip will be "deselected" by default
|
||||
digitalWrite(SS, HIGH);
|
||||
|
||||
// When the SS pin is set as OUTPUT, it can be used as
|
||||
// a general purpose output port (it doesn't influence
|
||||
// SPI operations).
|
||||
pinMode(SS, OUTPUT);
|
||||
|
||||
// Warning: if the SS pin ever becomes a LOW INPUT then SPI
|
||||
// automatically switches to Slave, so the data direction of
|
||||
// the SS pin MUST be kept as OUTPUT.
|
||||
SPCR |= _BV(MSTR);
|
||||
SPCR |= _BV(SPE);
|
||||
|
||||
// Set direction register for SCK and MOSI pin.
|
||||
// MISO pin automatically overrides to INPUT.
|
||||
// By doing this AFTER enabling SPI, we avoid accidentally
|
||||
// clocking in a single bit since the lines go directly
|
||||
// from "input" to SPI control.
|
||||
// http://code.google.com/p/arduino/issues/detail?id=888
|
||||
pinMode(SCK, OUTPUT);
|
||||
pinMode(MOSI, OUTPUT);
|
||||
}
|
||||
|
||||
|
||||
void SPIClass::end() {
|
||||
SPCR &= ~_BV(SPE);
|
||||
}
|
||||
|
||||
void SPIClass::setBitOrder(uint8_t bitOrder)
|
||||
{
|
||||
if(bitOrder == LSBFIRST) {
|
||||
SPCR |= _BV(DORD);
|
||||
} else {
|
||||
SPCR &= ~(_BV(DORD));
|
||||
}
|
||||
}
|
||||
|
||||
void SPIClass::setDataMode(uint8_t mode)
|
||||
{
|
||||
SPCR = (SPCR & ~SPI_MODE_MASK) | mode;
|
||||
}
|
||||
|
||||
void SPIClass::setClockDivider(uint8_t rate)
|
||||
{
|
||||
SPCR = (SPCR & ~SPI_CLOCK_MASK) | (rate & SPI_CLOCK_MASK);
|
||||
SPSR = (SPSR & ~SPI_2XCLOCK_MASK) | ((rate >> 2) & SPI_2XCLOCK_MASK);
|
||||
}
|
||||
|
||||
@ -0,0 +1,70 @@
|
||||
/*
|
||||
* Copyright (c) 2010 by Cristian Maglie <c.maglie@bug.st>
|
||||
* SPI Master library for arduino.
|
||||
*
|
||||
* This file is free software; you can redistribute it and/or modify
|
||||
* it under the terms of either the GNU General Public License version 2
|
||||
* or the GNU Lesser General Public License version 2.1, both as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef _SPI_H_INCLUDED
|
||||
#define _SPI_H_INCLUDED
|
||||
|
||||
#include <stdio.h>
|
||||
#include <Arduino.h>
|
||||
#include <avr/pgmspace.h>
|
||||
|
||||
#define SPI_CLOCK_DIV4 0x00
|
||||
#define SPI_CLOCK_DIV16 0x01
|
||||
#define SPI_CLOCK_DIV64 0x02
|
||||
#define SPI_CLOCK_DIV128 0x03
|
||||
#define SPI_CLOCK_DIV2 0x04
|
||||
#define SPI_CLOCK_DIV8 0x05
|
||||
#define SPI_CLOCK_DIV32 0x06
|
||||
//#define SPI_CLOCK_DIV64 0x07
|
||||
|
||||
#define SPI_MODE0 0x00
|
||||
#define SPI_MODE1 0x04
|
||||
#define SPI_MODE2 0x08
|
||||
#define SPI_MODE3 0x0C
|
||||
|
||||
#define SPI_MODE_MASK 0x0C // CPOL = bit 3, CPHA = bit 2 on SPCR
|
||||
#define SPI_CLOCK_MASK 0x03 // SPR1 = bit 1, SPR0 = bit 0 on SPCR
|
||||
#define SPI_2XCLOCK_MASK 0x01 // SPI2X = bit 0 on SPSR
|
||||
|
||||
class SPIClass {
|
||||
public:
|
||||
inline static byte transfer(byte _data);
|
||||
|
||||
// SPI Configuration methods
|
||||
|
||||
inline static void attachInterrupt();
|
||||
inline static void detachInterrupt(); // Default
|
||||
|
||||
static void begin(); // Default
|
||||
static void end();
|
||||
|
||||
static void setBitOrder(uint8_t);
|
||||
static void setDataMode(uint8_t);
|
||||
static void setClockDivider(uint8_t);
|
||||
};
|
||||
|
||||
extern SPIClass SPI;
|
||||
|
||||
byte SPIClass::transfer(byte _data) {
|
||||
SPDR = _data;
|
||||
while (!(SPSR & _BV(SPIF)))
|
||||
;
|
||||
return SPDR;
|
||||
}
|
||||
|
||||
void SPIClass::attachInterrupt() {
|
||||
SPCR |= _BV(SPIE);
|
||||
}
|
||||
|
||||
void SPIClass::detachInterrupt() {
|
||||
SPCR &= ~_BV(SPIE);
|
||||
}
|
||||
|
||||
#endif
|
||||
@ -0,0 +1,36 @@
|
||||
#######################################
|
||||
# Syntax Coloring Map SPI
|
||||
#######################################
|
||||
|
||||
#######################################
|
||||
# Datatypes (KEYWORD1)
|
||||
#######################################
|
||||
|
||||
SPI KEYWORD1
|
||||
|
||||
#######################################
|
||||
# Methods and Functions (KEYWORD2)
|
||||
#######################################
|
||||
begin KEYWORD2
|
||||
end KEYWORD2
|
||||
transfer KEYWORD2
|
||||
setBitOrder KEYWORD2
|
||||
setDataMode KEYWORD2
|
||||
setClockDivider KEYWORD2
|
||||
|
||||
|
||||
#######################################
|
||||
# Constants (LITERAL1)
|
||||
#######################################
|
||||
SPI_CLOCK_DIV4 LITERAL1
|
||||
SPI_CLOCK_DIV16 LITERAL1
|
||||
SPI_CLOCK_DIV64 LITERAL1
|
||||
SPI_CLOCK_DIV128 LITERAL1
|
||||
SPI_CLOCK_DIV2 LITERAL1
|
||||
SPI_CLOCK_DIV8 LITERAL1
|
||||
SPI_CLOCK_DIV32 LITERAL1
|
||||
SPI_CLOCK_DIV64 LITERAL1
|
||||
SPI_MODE0 LITERAL1
|
||||
SPI_MODE1 LITERAL1
|
||||
SPI_MODE2 LITERAL1
|
||||
SPI_MODE3 LITERAL1
|
||||
@ -0,0 +1,303 @@
|
||||
/*
|
||||
TwoWire.cpp - TWI/I2C library for Wiring & Arduino
|
||||
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||
|
||||
This library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
This library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with this library; if not, write to the Free Software
|
||||
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
|
||||
Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
|
||||
*/
|
||||
|
||||
extern "C" {
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <inttypes.h>
|
||||
#include "twi.h"
|
||||
}
|
||||
|
||||
#include "Wire.h"
|
||||
|
||||
// Initialize Class Variables //////////////////////////////////////////////////
|
||||
|
||||
uint8_t TwoWire::rxBuffer[BUFFER_LENGTH];
|
||||
uint8_t TwoWire::rxBufferIndex = 0;
|
||||
uint8_t TwoWire::rxBufferLength = 0;
|
||||
|
||||
uint8_t TwoWire::txAddress = 0;
|
||||
uint8_t TwoWire::txBuffer[BUFFER_LENGTH];
|
||||
uint8_t TwoWire::txBufferIndex = 0;
|
||||
uint8_t TwoWire::txBufferLength = 0;
|
||||
|
||||
uint8_t TwoWire::transmitting = 0;
|
||||
void (*TwoWire::user_onRequest)(void);
|
||||
void (*TwoWire::user_onReceive)(int);
|
||||
|
||||
// Constructors ////////////////////////////////////////////////////////////////
|
||||
|
||||
TwoWire::TwoWire()
|
||||
{
|
||||
}
|
||||
|
||||
// Public Methods //////////////////////////////////////////////////////////////
|
||||
|
||||
void TwoWire::begin(void)
|
||||
{
|
||||
rxBufferIndex = 0;
|
||||
rxBufferLength = 0;
|
||||
|
||||
txBufferIndex = 0;
|
||||
txBufferLength = 0;
|
||||
|
||||
twi_init();
|
||||
}
|
||||
|
||||
void TwoWire::begin(uint8_t address)
|
||||
{
|
||||
twi_setAddress(address);
|
||||
twi_attachSlaveTxEvent(onRequestService);
|
||||
twi_attachSlaveRxEvent(onReceiveService);
|
||||
begin();
|
||||
}
|
||||
|
||||
void TwoWire::begin(int address)
|
||||
{
|
||||
begin((uint8_t)address);
|
||||
}
|
||||
|
||||
void TwoWire::setClock(uint32_t frequency)
|
||||
{
|
||||
TWBR = ((F_CPU / frequency) - 16) / 2;
|
||||
}
|
||||
|
||||
uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity, uint8_t sendStop)
|
||||
{
|
||||
// clamp to buffer length
|
||||
if(quantity > BUFFER_LENGTH){
|
||||
quantity = BUFFER_LENGTH;
|
||||
}
|
||||
// perform blocking read into buffer
|
||||
uint8_t read = twi_readFrom(address, rxBuffer, quantity, sendStop);
|
||||
// set rx buffer iterator vars
|
||||
rxBufferIndex = 0;
|
||||
rxBufferLength = read;
|
||||
|
||||
return read;
|
||||
}
|
||||
|
||||
uint8_t TwoWire::requestFrom(uint8_t address, uint8_t quantity)
|
||||
{
|
||||
return requestFrom((uint8_t)address, (uint8_t)quantity, (uint8_t)true);
|
||||
}
|
||||
|
||||
uint8_t TwoWire::requestFrom(int address, int quantity)
|
||||
{
|
||||
return requestFrom((uint8_t)address, (uint8_t)quantity, (uint8_t)true);
|
||||
}
|
||||
|
||||
uint8_t TwoWire::requestFrom(int address, int quantity, int sendStop)
|
||||
{
|
||||
return requestFrom((uint8_t)address, (uint8_t)quantity, (uint8_t)sendStop);
|
||||
}
|
||||
|
||||
void TwoWire::beginTransmission(uint8_t address)
|
||||
{
|
||||
// indicate that we are transmitting
|
||||
transmitting = 1;
|
||||
// set address of targeted slave
|
||||
txAddress = address;
|
||||
// reset tx buffer iterator vars
|
||||
txBufferIndex = 0;
|
||||
txBufferLength = 0;
|
||||
}
|
||||
|
||||
void TwoWire::beginTransmission(int address)
|
||||
{
|
||||
beginTransmission((uint8_t)address);
|
||||
}
|
||||
|
||||
//
|
||||
// Originally, 'endTransmission' was an f(void) function.
|
||||
// It has been modified to take one parameter indicating
|
||||
// whether or not a STOP should be performed on the bus.
|
||||
// Calling endTransmission(false) allows a sketch to
|
||||
// perform a repeated start.
|
||||
//
|
||||
// WARNING: Nothing in the library keeps track of whether
|
||||
// the bus tenure has been properly ended with a STOP. It
|
||||
// is very possible to leave the bus in a hung state if
|
||||
// no call to endTransmission(true) is made. Some I2C
|
||||
// devices will behave oddly if they do not see a STOP.
|
||||
//
|
||||
uint8_t TwoWire::endTransmission(uint8_t sendStop)
|
||||
{
|
||||
// transmit buffer (blocking)
|
||||
int8_t ret = twi_writeTo(txAddress, txBuffer, txBufferLength, 1, sendStop);
|
||||
// reset tx buffer iterator vars
|
||||
txBufferIndex = 0;
|
||||
txBufferLength = 0;
|
||||
// indicate that we are done transmitting
|
||||
transmitting = 0;
|
||||
return ret;
|
||||
}
|
||||
|
||||
// This provides backwards compatibility with the original
|
||||
// definition, and expected behaviour, of endTransmission
|
||||
//
|
||||
uint8_t TwoWire::endTransmission(void)
|
||||
{
|
||||
return endTransmission(true);
|
||||
}
|
||||
|
||||
// must be called in:
|
||||
// slave tx event callback
|
||||
// or after beginTransmission(address)
|
||||
size_t TwoWire::write(uint8_t data)
|
||||
{
|
||||
if(transmitting){
|
||||
// in master transmitter mode
|
||||
// don't bother if buffer is full
|
||||
if(txBufferLength >= BUFFER_LENGTH){
|
||||
setWriteError();
|
||||
return 0;
|
||||
}
|
||||
// put byte in tx buffer
|
||||
txBuffer[txBufferIndex] = data;
|
||||
++txBufferIndex;
|
||||
// update amount in buffer
|
||||
txBufferLength = txBufferIndex;
|
||||
}else{
|
||||
// in slave send mode
|
||||
// reply to master
|
||||
twi_transmit(&data, 1);
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
// must be called in:
|
||||
// slave tx event callback
|
||||
// or after beginTransmission(address)
|
||||
size_t TwoWire::write(const uint8_t *data, size_t quantity)
|
||||
{
|
||||
if(transmitting){
|
||||
// in master transmitter mode
|
||||
for(size_t i = 0; i < quantity; ++i){
|
||||
write(data[i]);
|
||||
}
|
||||
}else{
|
||||
// in slave send mode
|
||||
// reply to master
|
||||
twi_transmit(data, quantity);
|
||||
}
|
||||
return quantity;
|
||||
}
|
||||
|
||||
// must be called in:
|
||||
// slave rx event callback
|
||||
// or after requestFrom(address, numBytes)
|
||||
int TwoWire::available(void)
|
||||
{
|
||||
return rxBufferLength - rxBufferIndex;
|
||||
}
|
||||
|
||||
// must be called in:
|
||||
// slave rx event callback
|
||||
// or after requestFrom(address, numBytes)
|
||||
int TwoWire::read(void)
|
||||
{
|
||||
int value = -1;
|
||||
|
||||
// get each successive byte on each call
|
||||
if(rxBufferIndex < rxBufferLength){
|
||||
value = rxBuffer[rxBufferIndex];
|
||||
++rxBufferIndex;
|
||||
}
|
||||
|
||||
return value;
|
||||
}
|
||||
|
||||
// must be called in:
|
||||
// slave rx event callback
|
||||
// or after requestFrom(address, numBytes)
|
||||
int TwoWire::peek(void)
|
||||
{
|
||||
int value = -1;
|
||||
|
||||
if(rxBufferIndex < rxBufferLength){
|
||||
value = rxBuffer[rxBufferIndex];
|
||||
}
|
||||
|
||||
return value;
|
||||
}
|
||||
|
||||
void TwoWire::flush(void)
|
||||
{
|
||||
// XXX: to be implemented.
|
||||
}
|
||||
|
||||
// behind the scenes function that is called when data is received
|
||||
void TwoWire::onReceiveService(uint8_t* inBytes, int numBytes)
|
||||
{
|
||||
// don't bother if user hasn't registered a callback
|
||||
if(!user_onReceive){
|
||||
return;
|
||||
}
|
||||
// don't bother if rx buffer is in use by a master requestFrom() op
|
||||
// i know this drops data, but it allows for slight stupidity
|
||||
// meaning, they may not have read all the master requestFrom() data yet
|
||||
if(rxBufferIndex < rxBufferLength){
|
||||
return;
|
||||
}
|
||||
// copy twi rx buffer into local read buffer
|
||||
// this enables new reads to happen in parallel
|
||||
for(uint8_t i = 0; i < numBytes; ++i){
|
||||
rxBuffer[i] = inBytes[i];
|
||||
}
|
||||
// set rx iterator vars
|
||||
rxBufferIndex = 0;
|
||||
rxBufferLength = numBytes;
|
||||
// alert user program
|
||||
user_onReceive(numBytes);
|
||||
}
|
||||
|
||||
// behind the scenes function that is called when data is requested
|
||||
void TwoWire::onRequestService(void)
|
||||
{
|
||||
// don't bother if user hasn't registered a callback
|
||||
if(!user_onRequest){
|
||||
return;
|
||||
}
|
||||
// reset tx buffer iterator vars
|
||||
// !!! this will kill any pending pre-master sendTo() activity
|
||||
txBufferIndex = 0;
|
||||
txBufferLength = 0;
|
||||
// alert user program
|
||||
user_onRequest();
|
||||
}
|
||||
|
||||
// sets function called on slave write
|
||||
void TwoWire::onReceive( void (*function)(int) )
|
||||
{
|
||||
user_onReceive = function;
|
||||
}
|
||||
|
||||
// sets function called on slave read
|
||||
void TwoWire::onRequest( void (*function)(void) )
|
||||
{
|
||||
user_onRequest = function;
|
||||
}
|
||||
|
||||
// Preinstantiate Objects //////////////////////////////////////////////////////
|
||||
|
||||
TwoWire Wire = TwoWire();
|
||||
|
||||
@ -0,0 +1,80 @@
|
||||
/*
|
||||
TwoWire.h - TWI/I2C library for Arduino & Wiring
|
||||
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||
|
||||
This library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
This library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with this library; if not, write to the Free Software
|
||||
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
|
||||
Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
|
||||
*/
|
||||
|
||||
#ifndef TwoWire_h
|
||||
#define TwoWire_h
|
||||
|
||||
#include <inttypes.h>
|
||||
#include "Stream.h"
|
||||
|
||||
#define BUFFER_LENGTH 32
|
||||
|
||||
class TwoWire : public Stream
|
||||
{
|
||||
private:
|
||||
static uint8_t rxBuffer[];
|
||||
static uint8_t rxBufferIndex;
|
||||
static uint8_t rxBufferLength;
|
||||
|
||||
static uint8_t txAddress;
|
||||
static uint8_t txBuffer[];
|
||||
static uint8_t txBufferIndex;
|
||||
static uint8_t txBufferLength;
|
||||
|
||||
static uint8_t transmitting;
|
||||
static void (*user_onRequest)(void);
|
||||
static void (*user_onReceive)(int);
|
||||
static void onRequestService(void);
|
||||
static void onReceiveService(uint8_t*, int);
|
||||
public:
|
||||
TwoWire();
|
||||
void begin();
|
||||
void begin(uint8_t);
|
||||
void begin(int);
|
||||
void setClock(uint32_t);
|
||||
void beginTransmission(uint8_t);
|
||||
void beginTransmission(int);
|
||||
uint8_t endTransmission(void);
|
||||
uint8_t endTransmission(uint8_t);
|
||||
uint8_t requestFrom(uint8_t, uint8_t);
|
||||
uint8_t requestFrom(uint8_t, uint8_t, uint8_t);
|
||||
uint8_t requestFrom(int, int);
|
||||
uint8_t requestFrom(int, int, int);
|
||||
virtual size_t write(uint8_t);
|
||||
virtual size_t write(const uint8_t *, size_t);
|
||||
virtual int available(void);
|
||||
virtual int read(void);
|
||||
virtual int peek(void);
|
||||
virtual void flush(void);
|
||||
void onReceive( void (*)(int) );
|
||||
void onRequest( void (*)(void) );
|
||||
|
||||
inline size_t write(unsigned long n) { return write((uint8_t)n); }
|
||||
inline size_t write(long n) { return write((uint8_t)n); }
|
||||
inline size_t write(unsigned int n) { return write((uint8_t)n); }
|
||||
inline size_t write(int n) { return write((uint8_t)n); }
|
||||
using Print::write;
|
||||
};
|
||||
|
||||
extern TwoWire Wire;
|
||||
|
||||
#endif
|
||||
|
||||
@ -0,0 +1,87 @@
|
||||
// I2C SRF10 or SRF08 Devantech Ultrasonic Ranger Finder
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
// and James Tichenor <http://www.jamestichenor.net>
|
||||
|
||||
// Demonstrates use of the Wire library reading data from the
|
||||
// Devantech Utrasonic Rangers SFR08 and SFR10
|
||||
|
||||
// Created 29 April 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(); // join i2c bus (address optional for master)
|
||||
Serial.begin(9600); // start serial communication at 9600bps
|
||||
}
|
||||
|
||||
int reading = 0;
|
||||
|
||||
void loop()
|
||||
{
|
||||
// step 1: instruct sensor to read echoes
|
||||
Wire.beginTransmission(112); // transmit to device #112 (0x70)
|
||||
// the address specified in the datasheet is 224 (0xE0)
|
||||
// but i2c adressing uses the high 7 bits so it's 112
|
||||
Wire.write(byte(0x00)); // sets register pointer to the command register (0x00)
|
||||
Wire.write(byte(0x50)); // command sensor to measure in "inches" (0x50)
|
||||
// use 0x51 for centimeters
|
||||
// use 0x52 for ping microseconds
|
||||
Wire.endTransmission(); // stop transmitting
|
||||
|
||||
// step 2: wait for readings to happen
|
||||
delay(70); // datasheet suggests at least 65 milliseconds
|
||||
|
||||
// step 3: instruct sensor to return a particular echo reading
|
||||
Wire.beginTransmission(112); // transmit to device #112
|
||||
Wire.write(byte(0x02)); // sets register pointer to echo #1 register (0x02)
|
||||
Wire.endTransmission(); // stop transmitting
|
||||
|
||||
// step 4: request reading from sensor
|
||||
Wire.requestFrom(112, 2); // request 2 bytes from slave device #112
|
||||
|
||||
// step 5: receive reading from sensor
|
||||
if (2 <= Wire.available()) // if two bytes were received
|
||||
{
|
||||
reading = Wire.read(); // receive high byte (overwrites previous reading)
|
||||
reading = reading << 8; // shift high byte to be high 8 bits
|
||||
reading |= Wire.read(); // receive low byte as lower 8 bits
|
||||
Serial.println(reading); // print the reading
|
||||
}
|
||||
|
||||
delay(250); // wait a bit since people have to read the output :)
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
|
||||
// The following code changes the address of a Devantech Ultrasonic Range Finder (SRF10 or SRF08)
|
||||
// usage: changeAddress(0x70, 0xE6);
|
||||
|
||||
void changeAddress(byte oldAddress, byte newAddress)
|
||||
{
|
||||
Wire.beginTransmission(oldAddress);
|
||||
Wire.write(byte(0x00));
|
||||
Wire.write(byte(0xA0));
|
||||
Wire.endTransmission();
|
||||
|
||||
Wire.beginTransmission(oldAddress);
|
||||
Wire.write(byte(0x00));
|
||||
Wire.write(byte(0xAA));
|
||||
Wire.endTransmission();
|
||||
|
||||
Wire.beginTransmission(oldAddress);
|
||||
Wire.write(byte(0x00));
|
||||
Wire.write(byte(0xA5));
|
||||
Wire.endTransmission();
|
||||
|
||||
Wire.beginTransmission(oldAddress);
|
||||
Wire.write(byte(0x00));
|
||||
Wire.write(newAddress);
|
||||
Wire.endTransmission();
|
||||
}
|
||||
|
||||
*/
|
||||
@ -0,0 +1,39 @@
|
||||
// I2C Digital Potentiometer
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
// and Shawn Bonkowski <http://people.interaction-ivrea.it/s.bonkowski/>
|
||||
|
||||
// Demonstrates use of the Wire library
|
||||
// Controls AD5171 digital potentiometer via I2C/TWI
|
||||
|
||||
// Created 31 March 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(); // join i2c bus (address optional for master)
|
||||
}
|
||||
|
||||
byte val = 0;
|
||||
|
||||
void loop()
|
||||
{
|
||||
Wire.beginTransmission(44); // transmit to device #44 (0x2c)
|
||||
// device address is specified in datasheet
|
||||
Wire.write(byte(0x00)); // sends instruction byte
|
||||
Wire.write(val); // sends potentiometer value byte
|
||||
Wire.endTransmission(); // stop transmitting
|
||||
|
||||
val++; // increment value
|
||||
if (val == 64) // if reached 64th position (max)
|
||||
{
|
||||
val = 0; // start over from lowest value
|
||||
}
|
||||
delay(500);
|
||||
}
|
||||
|
||||
@ -0,0 +1,32 @@
|
||||
// Wire Master Reader
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
|
||||
// Demonstrates use of the Wire library
|
||||
// Reads data from an I2C/TWI slave device
|
||||
// Refer to the "Wire Slave Sender" example for use with this
|
||||
|
||||
// Created 29 March 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(); // join i2c bus (address optional for master)
|
||||
Serial.begin(9600); // start serial for output
|
||||
}
|
||||
|
||||
void loop()
|
||||
{
|
||||
Wire.requestFrom(2, 6); // request 6 bytes from slave device #2
|
||||
|
||||
while (Wire.available()) // slave may send less than requested
|
||||
{
|
||||
char c = Wire.read(); // receive a byte as character
|
||||
Serial.print(c); // print the character
|
||||
}
|
||||
|
||||
delay(500);
|
||||
}
|
||||
@ -0,0 +1,31 @@
|
||||
// Wire Master Writer
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
|
||||
// Demonstrates use of the Wire library
|
||||
// Writes data to an I2C/TWI slave device
|
||||
// Refer to the "Wire Slave Receiver" example for use with this
|
||||
|
||||
// Created 29 March 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(); // join i2c bus (address optional for master)
|
||||
}
|
||||
|
||||
byte x = 0;
|
||||
|
||||
void loop()
|
||||
{
|
||||
Wire.beginTransmission(4); // transmit to device #4
|
||||
Wire.write("x is "); // sends five bytes
|
||||
Wire.write(x); // sends one byte
|
||||
Wire.endTransmission(); // stop transmitting
|
||||
|
||||
x++;
|
||||
delay(500);
|
||||
}
|
||||
@ -0,0 +1,38 @@
|
||||
// Wire Slave Receiver
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
|
||||
// Demonstrates use of the Wire library
|
||||
// Receives data as an I2C/TWI slave device
|
||||
// Refer to the "Wire Master Writer" example for use with this
|
||||
|
||||
// Created 29 March 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(4); // join i2c bus with address #4
|
||||
Wire.onReceive(receiveEvent); // register event
|
||||
Serial.begin(9600); // start serial for output
|
||||
}
|
||||
|
||||
void loop()
|
||||
{
|
||||
delay(100);
|
||||
}
|
||||
|
||||
// function that executes whenever data is received from master
|
||||
// this function is registered as an event, see setup()
|
||||
void receiveEvent(int howMany)
|
||||
{
|
||||
while (1 < Wire.available()) // loop through all but the last
|
||||
{
|
||||
char c = Wire.read(); // receive byte as a character
|
||||
Serial.print(c); // print the character
|
||||
}
|
||||
int x = Wire.read(); // receive byte as an integer
|
||||
Serial.println(x); // print the integer
|
||||
}
|
||||
@ -0,0 +1,32 @@
|
||||
// Wire Slave Sender
|
||||
// by Nicholas Zambetti <http://www.zambetti.com>
|
||||
|
||||
// Demonstrates use of the Wire library
|
||||
// Sends data as an I2C/TWI slave device
|
||||
// Refer to the "Wire Master Reader" example for use with this
|
||||
|
||||
// Created 29 March 2006
|
||||
|
||||
// This example code is in the public domain.
|
||||
|
||||
|
||||
#include <Wire.h>
|
||||
|
||||
void setup()
|
||||
{
|
||||
Wire.begin(2); // join i2c bus with address #2
|
||||
Wire.onRequest(requestEvent); // register event
|
||||
}
|
||||
|
||||
void loop()
|
||||
{
|
||||
delay(100);
|
||||
}
|
||||
|
||||
// function that executes whenever data is requested by master
|
||||
// this function is registered as an event, see setup()
|
||||
void requestEvent()
|
||||
{
|
||||
Wire.write("hello "); // respond with message of 6 bytes
|
||||
// as expected by master
|
||||
}
|
||||
@ -0,0 +1,32 @@
|
||||
#######################################
|
||||
# Syntax Coloring Map For Wire
|
||||
#######################################
|
||||
|
||||
#######################################
|
||||
# Datatypes (KEYWORD1)
|
||||
#######################################
|
||||
|
||||
#######################################
|
||||
# Methods and Functions (KEYWORD2)
|
||||
#######################################
|
||||
|
||||
begin KEYWORD2
|
||||
setClock KEYWORD2
|
||||
beginTransmission KEYWORD2
|
||||
endTransmission KEYWORD2
|
||||
requestFrom KEYWORD2
|
||||
send KEYWORD2
|
||||
receive KEYWORD2
|
||||
onReceive KEYWORD2
|
||||
onRequest KEYWORD2
|
||||
|
||||
#######################################
|
||||
# Instances (KEYWORD2)
|
||||
#######################################
|
||||
|
||||
Wire KEYWORD2
|
||||
|
||||
#######################################
|
||||
# Constants (LITERAL1)
|
||||
#######################################
|
||||
|
||||
@ -0,0 +1,8 @@
|
||||
name=Wire
|
||||
version=1.0
|
||||
author=Arduino
|
||||
maintainer=Arduino <info@arduino.cc>
|
||||
sentence=Allows the communication between devices or sensors connected via Two Wire Interface Bus. For all Arduino boards, BUT Arduino DUE.
|
||||
paragraph=
|
||||
url=http://arduino.cc/en/Reference/Wire
|
||||
architectures=avr
|
||||
@ -0,0 +1,527 @@
|
||||
/*
|
||||
twi.c - TWI/I2C library for Wiring & Arduino
|
||||
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||
|
||||
This library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
This library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with this library; if not, write to the Free Software
|
||||
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
|
||||
Modified 2012 by Todd Krein (todd@krein.org) to implement repeated starts
|
||||
*/
|
||||
|
||||
#include <math.h>
|
||||
#include <stdlib.h>
|
||||
#include <inttypes.h>
|
||||
#include <avr/io.h>
|
||||
#include <avr/interrupt.h>
|
||||
#include <compat/twi.h>
|
||||
#include "Arduino.h" // for digitalWrite
|
||||
|
||||
#ifndef cbi
|
||||
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
|
||||
#endif
|
||||
|
||||
#ifndef sbi
|
||||
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
|
||||
#endif
|
||||
|
||||
#include "pins_arduino.h"
|
||||
#include "twi.h"
|
||||
|
||||
static volatile uint8_t twi_state;
|
||||
static volatile uint8_t twi_slarw;
|
||||
static volatile uint8_t twi_sendStop; // should the transaction end with a stop
|
||||
static volatile uint8_t twi_inRepStart; // in the middle of a repeated start
|
||||
|
||||
static void (*twi_onSlaveTransmit)(void);
|
||||
static void (*twi_onSlaveReceive)(uint8_t*, int);
|
||||
|
||||
static uint8_t twi_masterBuffer[TWI_BUFFER_LENGTH];
|
||||
static volatile uint8_t twi_masterBufferIndex;
|
||||
static volatile uint8_t twi_masterBufferLength;
|
||||
|
||||
static uint8_t twi_txBuffer[TWI_BUFFER_LENGTH];
|
||||
static volatile uint8_t twi_txBufferIndex;
|
||||
static volatile uint8_t twi_txBufferLength;
|
||||
|
||||
static uint8_t twi_rxBuffer[TWI_BUFFER_LENGTH];
|
||||
static volatile uint8_t twi_rxBufferIndex;
|
||||
|
||||
static volatile uint8_t twi_error;
|
||||
|
||||
/*
|
||||
* Function twi_init
|
||||
* Desc readys twi pins and sets twi bitrate
|
||||
* Input none
|
||||
* Output none
|
||||
*/
|
||||
void twi_init(void)
|
||||
{
|
||||
// initialize state
|
||||
twi_state = TWI_READY;
|
||||
twi_sendStop = true; // default value
|
||||
twi_inRepStart = false;
|
||||
|
||||
// activate internal pullups for twi.
|
||||
digitalWrite(SDA, 1);
|
||||
digitalWrite(SCL, 1);
|
||||
|
||||
// initialize twi prescaler and bit rate
|
||||
cbi(TWSR, TWPS0);
|
||||
cbi(TWSR, TWPS1);
|
||||
TWBR = ((F_CPU / TWI_FREQ) - 16) / 2;
|
||||
|
||||
/* twi bit rate formula from atmega128 manual pg 204
|
||||
SCL Frequency = CPU Clock Frequency / (16 + (2 * TWBR))
|
||||
note: TWBR should be 10 or higher for master mode
|
||||
It is 72 for a 16mhz Wiring board with 100kHz TWI */
|
||||
|
||||
// enable twi module, acks, and twi interrupt
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA);
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_slaveInit
|
||||
* Desc sets slave address and enables interrupt
|
||||
* Input none
|
||||
* Output none
|
||||
*/
|
||||
void twi_setAddress(uint8_t address)
|
||||
{
|
||||
// set twi slave address (skip over TWGCE bit)
|
||||
TWAR = address << 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_readFrom
|
||||
* Desc attempts to become twi bus master and read a
|
||||
* series of bytes from a device on the bus
|
||||
* Input address: 7bit i2c device address
|
||||
* data: pointer to byte array
|
||||
* length: number of bytes to read into array
|
||||
* sendStop: Boolean indicating whether to send a stop at the end
|
||||
* Output number of bytes read
|
||||
*/
|
||||
uint8_t twi_readFrom(uint8_t address, uint8_t* data, uint8_t length, uint8_t sendStop)
|
||||
{
|
||||
uint8_t i;
|
||||
|
||||
// ensure data will fit into buffer
|
||||
if(TWI_BUFFER_LENGTH < length){
|
||||
return 0;
|
||||
}
|
||||
|
||||
// wait until twi is ready, become master receiver
|
||||
while(TWI_READY != twi_state){
|
||||
continue;
|
||||
}
|
||||
twi_state = TWI_MRX;
|
||||
twi_sendStop = sendStop;
|
||||
// reset error state (0xFF.. no error occured)
|
||||
twi_error = 0xFF;
|
||||
|
||||
// initialize buffer iteration vars
|
||||
twi_masterBufferIndex = 0;
|
||||
twi_masterBufferLength = length-1; // This is not intuitive, read on...
|
||||
// On receive, the previously configured ACK/NACK setting is transmitted in
|
||||
// response to the received byte before the interrupt is signalled.
|
||||
// Therefor we must actually set NACK when the _next_ to last byte is
|
||||
// received, causing that NACK to be sent in response to receiving the last
|
||||
// expected byte of data.
|
||||
|
||||
// build sla+w, slave device address + w bit
|
||||
twi_slarw = TW_READ;
|
||||
twi_slarw |= address << 1;
|
||||
|
||||
if (true == twi_inRepStart) {
|
||||
// if we're in the repeated start state, then we've already sent the start,
|
||||
// (@@@ we hope), and the TWI statemachine is just waiting for the address byte.
|
||||
// We need to remove ourselves from the repeated start state before we enable interrupts,
|
||||
// since the ISR is ASYNC, and we could get confused if we hit the ISR before cleaning
|
||||
// up. Also, don't enable the START interrupt. There may be one pending from the
|
||||
// repeated start that we sent outselves, and that would really confuse things.
|
||||
twi_inRepStart = false; // remember, we're dealing with an ASYNC ISR
|
||||
TWDR = twi_slarw;
|
||||
TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE); // enable INTs, but not START
|
||||
}
|
||||
else
|
||||
// send start condition
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTA);
|
||||
|
||||
// wait for read operation to complete
|
||||
while(TWI_MRX == twi_state){
|
||||
continue;
|
||||
}
|
||||
|
||||
if (twi_masterBufferIndex < length)
|
||||
length = twi_masterBufferIndex;
|
||||
|
||||
// copy twi buffer to data
|
||||
for(i = 0; i < length; ++i){
|
||||
data[i] = twi_masterBuffer[i];
|
||||
}
|
||||
|
||||
return length;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_writeTo
|
||||
* Desc attempts to become twi bus master and write a
|
||||
* series of bytes to a device on the bus
|
||||
* Input address: 7bit i2c device address
|
||||
* data: pointer to byte array
|
||||
* length: number of bytes in array
|
||||
* wait: boolean indicating to wait for write or not
|
||||
* sendStop: boolean indicating whether or not to send a stop at the end
|
||||
* Output 0 .. success
|
||||
* 1 .. length to long for buffer
|
||||
* 2 .. address send, NACK received
|
||||
* 3 .. data send, NACK received
|
||||
* 4 .. other twi error (lost bus arbitration, bus error, ..)
|
||||
*/
|
||||
uint8_t twi_writeTo(uint8_t address, uint8_t* data, uint8_t length, uint8_t wait, uint8_t sendStop)
|
||||
{
|
||||
uint8_t i;
|
||||
|
||||
// ensure data will fit into buffer
|
||||
if(TWI_BUFFER_LENGTH < length){
|
||||
return 1;
|
||||
}
|
||||
|
||||
// wait until twi is ready, become master transmitter
|
||||
while(TWI_READY != twi_state){
|
||||
continue;
|
||||
}
|
||||
twi_state = TWI_MTX;
|
||||
twi_sendStop = sendStop;
|
||||
// reset error state (0xFF.. no error occured)
|
||||
twi_error = 0xFF;
|
||||
|
||||
// initialize buffer iteration vars
|
||||
twi_masterBufferIndex = 0;
|
||||
twi_masterBufferLength = length;
|
||||
|
||||
// copy data to twi buffer
|
||||
for(i = 0; i < length; ++i){
|
||||
twi_masterBuffer[i] = data[i];
|
||||
}
|
||||
|
||||
// build sla+w, slave device address + w bit
|
||||
twi_slarw = TW_WRITE;
|
||||
twi_slarw |= address << 1;
|
||||
|
||||
// if we're in a repeated start, then we've already sent the START
|
||||
// in the ISR. Don't do it again.
|
||||
//
|
||||
if (true == twi_inRepStart) {
|
||||
// if we're in the repeated start state, then we've already sent the start,
|
||||
// (@@@ we hope), and the TWI statemachine is just waiting for the address byte.
|
||||
// We need to remove ourselves from the repeated start state before we enable interrupts,
|
||||
// since the ISR is ASYNC, and we could get confused if we hit the ISR before cleaning
|
||||
// up. Also, don't enable the START interrupt. There may be one pending from the
|
||||
// repeated start that we sent outselves, and that would really confuse things.
|
||||
twi_inRepStart = false; // remember, we're dealing with an ASYNC ISR
|
||||
TWDR = twi_slarw;
|
||||
TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE); // enable INTs, but not START
|
||||
}
|
||||
else
|
||||
// send start condition
|
||||
TWCR = _BV(TWINT) | _BV(TWEA) | _BV(TWEN) | _BV(TWIE) | _BV(TWSTA); // enable INTs
|
||||
|
||||
// wait for write operation to complete
|
||||
while(wait && (TWI_MTX == twi_state)){
|
||||
continue;
|
||||
}
|
||||
|
||||
if (twi_error == 0xFF)
|
||||
return 0; // success
|
||||
else if (twi_error == TW_MT_SLA_NACK)
|
||||
return 2; // error: address send, nack received
|
||||
else if (twi_error == TW_MT_DATA_NACK)
|
||||
return 3; // error: data send, nack received
|
||||
else
|
||||
return 4; // other twi error
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_transmit
|
||||
* Desc fills slave tx buffer with data
|
||||
* must be called in slave tx event callback
|
||||
* Input data: pointer to byte array
|
||||
* length: number of bytes in array
|
||||
* Output 1 length too long for buffer
|
||||
* 2 not slave transmitter
|
||||
* 0 ok
|
||||
*/
|
||||
uint8_t twi_transmit(const uint8_t* data, uint8_t length)
|
||||
{
|
||||
uint8_t i;
|
||||
|
||||
// ensure data will fit into buffer
|
||||
if(TWI_BUFFER_LENGTH < length){
|
||||
return 1;
|
||||
}
|
||||
|
||||
// ensure we are currently a slave transmitter
|
||||
if(TWI_STX != twi_state){
|
||||
return 2;
|
||||
}
|
||||
|
||||
// set length and copy data into tx buffer
|
||||
twi_txBufferLength = length;
|
||||
for(i = 0; i < length; ++i){
|
||||
twi_txBuffer[i] = data[i];
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_attachSlaveRxEvent
|
||||
* Desc sets function called before a slave read operation
|
||||
* Input function: callback function to use
|
||||
* Output none
|
||||
*/
|
||||
void twi_attachSlaveRxEvent( void (*function)(uint8_t*, int) )
|
||||
{
|
||||
twi_onSlaveReceive = function;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_attachSlaveTxEvent
|
||||
* Desc sets function called before a slave write operation
|
||||
* Input function: callback function to use
|
||||
* Output none
|
||||
*/
|
||||
void twi_attachSlaveTxEvent( void (*function)(void) )
|
||||
{
|
||||
twi_onSlaveTransmit = function;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_reply
|
||||
* Desc sends byte or readys receive line
|
||||
* Input ack: byte indicating to ack or to nack
|
||||
* Output none
|
||||
*/
|
||||
void twi_reply(uint8_t ack)
|
||||
{
|
||||
// transmit master read ready signal, with or without ack
|
||||
if(ack){
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWINT) | _BV(TWEA);
|
||||
}else{
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWINT);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_stop
|
||||
* Desc relinquishes bus master status
|
||||
* Input none
|
||||
* Output none
|
||||
*/
|
||||
void twi_stop(void)
|
||||
{
|
||||
// send stop condition
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT) | _BV(TWSTO);
|
||||
|
||||
// wait for stop condition to be exectued on bus
|
||||
// TWINT is not set after a stop condition!
|
||||
while(TWCR & _BV(TWSTO)){
|
||||
continue;
|
||||
}
|
||||
|
||||
// update twi state
|
||||
twi_state = TWI_READY;
|
||||
}
|
||||
|
||||
/*
|
||||
* Function twi_releaseBus
|
||||
* Desc releases bus control
|
||||
* Input none
|
||||
* Output none
|
||||
*/
|
||||
void twi_releaseBus(void)
|
||||
{
|
||||
// release bus
|
||||
TWCR = _BV(TWEN) | _BV(TWIE) | _BV(TWEA) | _BV(TWINT);
|
||||
|
||||
// update twi state
|
||||
twi_state = TWI_READY;
|
||||
}
|
||||
|
||||
ISR(TWI_vect)
|
||||
{
|
||||
switch(TW_STATUS){
|
||||
// All Master
|
||||
case TW_START: // sent start condition
|
||||
case TW_REP_START: // sent repeated start condition
|
||||
// copy device address and r/w bit to output register and ack
|
||||
TWDR = twi_slarw;
|
||||
twi_reply(1);
|
||||
break;
|
||||
|
||||
// Master Transmitter
|
||||
case TW_MT_SLA_ACK: // slave receiver acked address
|
||||
case TW_MT_DATA_ACK: // slave receiver acked data
|
||||
// if there is data to send, send it, otherwise stop
|
||||
if(twi_masterBufferIndex < twi_masterBufferLength){
|
||||
// copy data to output register and ack
|
||||
TWDR = twi_masterBuffer[twi_masterBufferIndex++];
|
||||
twi_reply(1);
|
||||
}else{
|
||||
if (twi_sendStop)
|
||||
twi_stop();
|
||||
else {
|
||||
twi_inRepStart = true; // we're gonna send the START
|
||||
// don't enable the interrupt. We'll generate the start, but we
|
||||
// avoid handling the interrupt until we're in the next transaction,
|
||||
// at the point where we would normally issue the start.
|
||||
TWCR = _BV(TWINT) | _BV(TWSTA)| _BV(TWEN) ;
|
||||
twi_state = TWI_READY;
|
||||
}
|
||||
}
|
||||
break;
|
||||
case TW_MT_SLA_NACK: // address sent, nack received
|
||||
twi_error = TW_MT_SLA_NACK;
|
||||
twi_stop();
|
||||
break;
|
||||
case TW_MT_DATA_NACK: // data sent, nack received
|
||||
twi_error = TW_MT_DATA_NACK;
|
||||
twi_stop();
|
||||
break;
|
||||
case TW_MT_ARB_LOST: // lost bus arbitration
|
||||
twi_error = TW_MT_ARB_LOST;
|
||||
twi_releaseBus();
|
||||
break;
|
||||
|
||||
// Master Receiver
|
||||
case TW_MR_DATA_ACK: // data received, ack sent
|
||||
// put byte into buffer
|
||||
twi_masterBuffer[twi_masterBufferIndex++] = TWDR;
|
||||
case TW_MR_SLA_ACK: // address sent, ack received
|
||||
// ack if more bytes are expected, otherwise nack
|
||||
if(twi_masterBufferIndex < twi_masterBufferLength){
|
||||
twi_reply(1);
|
||||
}else{
|
||||
twi_reply(0);
|
||||
}
|
||||
break;
|
||||
case TW_MR_DATA_NACK: // data received, nack sent
|
||||
// put final byte into buffer
|
||||
twi_masterBuffer[twi_masterBufferIndex++] = TWDR;
|
||||
if (twi_sendStop)
|
||||
twi_stop();
|
||||
else {
|
||||
twi_inRepStart = true; // we're gonna send the START
|
||||
// don't enable the interrupt. We'll generate the start, but we
|
||||
// avoid handling the interrupt until we're in the next transaction,
|
||||
// at the point where we would normally issue the start.
|
||||
TWCR = _BV(TWINT) | _BV(TWSTA)| _BV(TWEN) ;
|
||||
twi_state = TWI_READY;
|
||||
}
|
||||
break;
|
||||
case TW_MR_SLA_NACK: // address sent, nack received
|
||||
twi_stop();
|
||||
break;
|
||||
// TW_MR_ARB_LOST handled by TW_MT_ARB_LOST case
|
||||
|
||||
// Slave Receiver
|
||||
case TW_SR_SLA_ACK: // addressed, returned ack
|
||||
case TW_SR_GCALL_ACK: // addressed generally, returned ack
|
||||
case TW_SR_ARB_LOST_SLA_ACK: // lost arbitration, returned ack
|
||||
case TW_SR_ARB_LOST_GCALL_ACK: // lost arbitration, returned ack
|
||||
// enter slave receiver mode
|
||||
twi_state = TWI_SRX;
|
||||
// indicate that rx buffer can be overwritten and ack
|
||||
twi_rxBufferIndex = 0;
|
||||
twi_reply(1);
|
||||
break;
|
||||
case TW_SR_DATA_ACK: // data received, returned ack
|
||||
case TW_SR_GCALL_DATA_ACK: // data received generally, returned ack
|
||||
// if there is still room in the rx buffer
|
||||
if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){
|
||||
// put byte in buffer and ack
|
||||
twi_rxBuffer[twi_rxBufferIndex++] = TWDR;
|
||||
twi_reply(1);
|
||||
}else{
|
||||
// otherwise nack
|
||||
twi_reply(0);
|
||||
}
|
||||
break;
|
||||
case TW_SR_STOP: // stop or repeated start condition received
|
||||
// put a null char after data if there's room
|
||||
if(twi_rxBufferIndex < TWI_BUFFER_LENGTH){
|
||||
twi_rxBuffer[twi_rxBufferIndex] = '\0';
|
||||
}
|
||||
// sends ack and stops interface for clock stretching
|
||||
twi_stop();
|
||||
// callback to user defined callback
|
||||
twi_onSlaveReceive(twi_rxBuffer, twi_rxBufferIndex);
|
||||
// since we submit rx buffer to "wire" library, we can reset it
|
||||
twi_rxBufferIndex = 0;
|
||||
// ack future responses and leave slave receiver state
|
||||
twi_releaseBus();
|
||||
break;
|
||||
case TW_SR_DATA_NACK: // data received, returned nack
|
||||
case TW_SR_GCALL_DATA_NACK: // data received generally, returned nack
|
||||
// nack back at master
|
||||
twi_reply(0);
|
||||
break;
|
||||
|
||||
// Slave Transmitter
|
||||
case TW_ST_SLA_ACK: // addressed, returned ack
|
||||
case TW_ST_ARB_LOST_SLA_ACK: // arbitration lost, returned ack
|
||||
// enter slave transmitter mode
|
||||
twi_state = TWI_STX;
|
||||
// ready the tx buffer index for iteration
|
||||
twi_txBufferIndex = 0;
|
||||
// set tx buffer length to be zero, to verify if user changes it
|
||||
twi_txBufferLength = 0;
|
||||
// request for txBuffer to be filled and length to be set
|
||||
// note: user must call twi_transmit(bytes, length) to do this
|
||||
twi_onSlaveTransmit();
|
||||
// if they didn't change buffer & length, initialize it
|
||||
if(0 == twi_txBufferLength){
|
||||
twi_txBufferLength = 1;
|
||||
twi_txBuffer[0] = 0x00;
|
||||
}
|
||||
// transmit first byte from buffer, fall
|
||||
case TW_ST_DATA_ACK: // byte sent, ack returned
|
||||
// copy data to output register
|
||||
TWDR = twi_txBuffer[twi_txBufferIndex++];
|
||||
// if there is more to send, ack, otherwise nack
|
||||
if(twi_txBufferIndex < twi_txBufferLength){
|
||||
twi_reply(1);
|
||||
}else{
|
||||
twi_reply(0);
|
||||
}
|
||||
break;
|
||||
case TW_ST_DATA_NACK: // received nack, we are done
|
||||
case TW_ST_LAST_DATA: // received ack, but we are done already!
|
||||
// ack future responses
|
||||
twi_reply(1);
|
||||
// leave slave receiver state
|
||||
twi_state = TWI_READY;
|
||||
break;
|
||||
|
||||
// All
|
||||
case TW_NO_INFO: // no state information
|
||||
break;
|
||||
case TW_BUS_ERROR: // bus error, illegal stop/start
|
||||
twi_error = TW_BUS_ERROR;
|
||||
twi_stop();
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
@ -0,0 +1,53 @@
|
||||
/*
|
||||
twi.h - TWI/I2C library for Wiring & Arduino
|
||||
Copyright (c) 2006 Nicholas Zambetti. All right reserved.
|
||||
|
||||
This library is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU Lesser General Public
|
||||
License as published by the Free Software Foundation; either
|
||||
version 2.1 of the License, or (at your option) any later version.
|
||||
|
||||
This library is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public
|
||||
License along with this library; if not, write to the Free Software
|
||||
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
|
||||
#ifndef twi_h
|
||||
#define twi_h
|
||||
|
||||
#include <inttypes.h>
|
||||
|
||||
//#define ATMEGA8
|
||||
|
||||
#ifndef TWI_FREQ
|
||||
#define TWI_FREQ 100000L
|
||||
#endif
|
||||
|
||||
#ifndef TWI_BUFFER_LENGTH
|
||||
#define TWI_BUFFER_LENGTH 32
|
||||
#endif
|
||||
|
||||
#define TWI_READY 0
|
||||
#define TWI_MRX 1
|
||||
#define TWI_MTX 2
|
||||
#define TWI_SRX 3
|
||||
#define TWI_STX 4
|
||||
|
||||
void twi_init(void);
|
||||
void twi_setAddress(uint8_t);
|
||||
uint8_t twi_readFrom(uint8_t, uint8_t*, uint8_t, uint8_t);
|
||||
uint8_t twi_writeTo(uint8_t, uint8_t*, uint8_t, uint8_t, uint8_t);
|
||||
uint8_t twi_transmit(const uint8_t*, uint8_t);
|
||||
void twi_attachSlaveRxEvent( void (*)(uint8_t*, int) );
|
||||
void twi_attachSlaveTxEvent( void (*)(void) );
|
||||
void twi_reply(uint8_t);
|
||||
void twi_stop(void);
|
||||
void twi_releaseBus(void);
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user