mirror of
https://github.com/MarlinFirmware/Marlin.git
synced 2024-11-30 23:30:16 +00:00
96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
|
/*
|
||
|
|
wiring_digital.c - digital input and output functions
|
||
|
|
Part of Arduino - http://www.arduino.cc/
|
||
|
|
|
||
|
|
Copyright (c) 2005-2006 David A. Mellis
|
||
|
|
|
||
|
|
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., 59 Temple Place, Suite 330,
|
||
|
|
Boston, MA 02111-1307 USA
|
||
|
|
|
||
|
|
$Id: wiring.c 248 2007-02-03 15:36:30Z mellis $
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "wiring_private.h"
|
||
|
|
#include "pins_arduino.h"
|
||
|
|
|
||
|
|
void pinMode(uint8_t pin, uint8_t mode)
|
||
|
|
{
|
||
|
|
uint8_t bit = digitalPinToBitMask(pin);
|
||
|
|
uint8_t port = digitalPinToPort(pin);
|
||
|
|
volatile uint8_t *reg;
|
||
|
|
|
||
|
|
if (port == NOT_A_PIN) return;
|
||
|
|
|
||
|
|
// JWS: can I let the optimizer do this?
|
||
|
|
reg = portModeRegister(port);
|
||
|
|
|
||
|
|
if (mode == INPUT) *reg &= ~bit;
|
||
|
|
else *reg |= bit;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Forcing this inline keeps the callers from having to push their own stuff
|
||
|
|
// on the stack. It is a good performance win and only takes 1 more byte per
|
||
|
|
// user than calling. (It will take more bytes on the 168.)
|
||
|
|
//
|
||
|
|
// But shouldn't this be moved into pinMode? Seems silly to check and do on
|
||
|
|
// each digitalread or write.
|
||
|
|
//
|
||
|
|
static inline void turnOffPWM(uint8_t timer) __attribute__ ((always_inline));
|
||
|
|
static inline void turnOffPWM(uint8_t timer)
|
||
|
|
{
|
||
|
|
if (timer == TIMER0A) cbi(TCCR0A, COM0A1);
|
||
|
|
if (timer == TIMER0B) cbi(TCCR0A, COM0B1);
|
||
|
|
if (timer == TIMER1A) cbi(TCCR1A, COM1A1);
|
||
|
|
if (timer == TIMER1B) cbi(TCCR1A, COM1B1);
|
||
|
|
if (timer == TIMER2A) cbi(TCCR2A, COM2A1);
|
||
|
|
if (timer == TIMER2B) cbi(TCCR2A, COM2B1);
|
||
|
|
}
|
||
|
|
|
||
|
|
void digitalWrite(uint8_t pin, uint8_t val)
|
||
|
|
{
|
||
|
|
uint8_t timer = digitalPinToTimer(pin);
|
||
|
|
uint8_t bit = digitalPinToBitMask(pin);
|
||
|
|
uint8_t port = digitalPinToPort(pin);
|
||
|
|
volatile uint8_t *out;
|
||
|
|
|
||
|
|
if (port == NOT_A_PIN) return;
|
||
|
|
|
||
|
|
// If the pin that support PWM output, we need to turn it off
|
||
|
|
// before doing a digital write.
|
||
|
|
if (timer != NOT_ON_TIMER) turnOffPWM(timer);
|
||
|
|
|
||
|
|
out = portOutputRegister(port);
|
||
|
|
|
||
|
|
if (val == LOW) *out &= ~bit;
|
||
|
|
else *out |= bit;
|
||
|
|
}
|
||
|
|
|
||
|
|
int digitalRead(uint8_t pin)
|
||
|
|
{
|
||
|
|
uint8_t timer = digitalPinToTimer(pin);
|
||
|
|
uint8_t bit = digitalPinToBitMask(pin);
|
||
|
|
uint8_t port = digitalPinToPort(pin);
|
||
|
|
|
||
|
|
if (port == NOT_A_PIN) return LOW;
|
||
|
|
|
||
|
|
// If the pin that support PWM output, we need to turn it off
|
||
|
|
// before getting a digital reading.
|
||
|
|
if (timer != NOT_ON_TIMER) turnOffPWM(timer);
|
||
|
|
|
||
|
|
if (*portInputRegister(port) & bit) return HIGH;
|
||
|
|
|
||
|
|
return LOW;
|
||
|
|
}
|