322 lines
10 KiB
C++
322 lines
10 KiB
C++
//! @file
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// Based on the OptiBoot project
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// https://github.com/Optiboot/optiboot
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// Licence GLP 2 or later.
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#include "Marlin.h"
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#include "w25x20cl.h"
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#include "stk500.h"
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#include "bootapp.h"
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#define OPTIBOOT_MAJVER 6
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#define OPTIBOOT_CUSTOMVER 0
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#define OPTIBOOT_MINVER 2
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static unsigned const int __attribute__((section(".version")))
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optiboot_version = 256*(OPTIBOOT_MAJVER + OPTIBOOT_CUSTOMVER) + OPTIBOOT_MINVER;
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/* Watchdog settings */
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#define WATCHDOG_OFF (0)
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#define WATCHDOG_16MS (_BV(WDE))
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#define WATCHDOG_32MS (_BV(WDP0) | _BV(WDE))
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#define WATCHDOG_64MS (_BV(WDP1) | _BV(WDE))
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#define WATCHDOG_125MS (_BV(WDP1) | _BV(WDP0) | _BV(WDE))
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#define WATCHDOG_250MS (_BV(WDP2) | _BV(WDE))
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#define WATCHDOG_500MS (_BV(WDP2) | _BV(WDP0) | _BV(WDE))
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#define WATCHDOG_1S (_BV(WDP2) | _BV(WDP1) | _BV(WDE))
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#define WATCHDOG_2S (_BV(WDP2) | _BV(WDP1) | _BV(WDP0) | _BV(WDE))
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#define WATCHDOG_4S (_BV(WDP3) | _BV(WDE))
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#define WATCHDOG_8S (_BV(WDP3) | _BV(WDP0) | _BV(WDE))
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#if 0
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#define W25X20CL_SIGNATURE_0 9
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#define W25X20CL_SIGNATURE_1 8
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#define W25X20CL_SIGNATURE_2 7
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#else
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//FIXME this is a signature of ATmega2560!
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#define W25X20CL_SIGNATURE_0 0x1E
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#define W25X20CL_SIGNATURE_1 0x98
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#define W25X20CL_SIGNATURE_2 0x01
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#endif
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static void watchdogConfig(uint8_t x) {
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WDTCSR = _BV(WDCE) | _BV(WDE);
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WDTCSR = x;
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}
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static void watchdogReset() {
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__asm__ __volatile__ (
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"wdr\n"
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);
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}
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#define RECV_READY ((UCSR0A & _BV(RXC0)) != 0)
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static uint8_t getch(void) {
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uint8_t ch;
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while(! RECV_READY) ;
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if (!(UCSR0A & _BV(FE0))) {
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/*
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* A Framing Error indicates (probably) that something is talking
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* to us at the wrong bit rate. Assume that this is because it
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* expects to be talking to the application, and DON'T reset the
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* watchdog. This should cause the bootloader to abort and run
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* the application "soon", if it keeps happening. (Note that we
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* don't care that an invalid char is returned...)
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*/
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watchdogReset();
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}
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ch = UDR0;
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return ch;
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}
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static void putch(char ch) {
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while (!(UCSR0A & _BV(UDRE0)));
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UDR0 = ch;
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}
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static void verifySpace() {
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if (getch() != CRC_EOP) {
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putch(STK_FAILED);
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watchdogConfig(WATCHDOG_16MS); // shorten WD timeout
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while (1) // and busy-loop so that WD causes
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; // a reset and app start.
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}
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putch(STK_INSYNC);
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}
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static void getNch(uint8_t count) {
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do getch(); while (--count);
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verifySpace();
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}
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typedef uint16_t pagelen_t;
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static const char entry_magic_send [] PROGMEM = "start\n";
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static const char entry_magic_receive[] PROGMEM = "w25x20cl_enter\n";
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static const char entry_magic_cfm [] PROGMEM = "w25x20cl_cfm\n";
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struct block_t;
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extern struct block_t *block_buffer;
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//! @brief Enter an STK500 compatible Optiboot boot loader waiting for flashing the languages to an external flash memory.
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//! @return 1 if "start\n" was not sent. Optiboot was skipped
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//! @return 0 if "start\n" was sent. Optiboot ran normally. No need to send "start\n" in setup()
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uint8_t optiboot_w25x20cl_enter()
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{
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if (boot_app_flags & BOOT_APP_FLG_USER0) return 1;
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uint8_t ch;
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uint8_t rampz = 0;
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register uint16_t address = 0;
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register pagelen_t length;
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// Use the planner's queue for the receive / transmit buffers.
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// uint8_t *buff = (uint8_t*)block_buffer;
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uint8_t buff[260];
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// bitmap of pages to be written. Bit is set to 1 if the page has already been erased.
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uint8_t pages_erased = 0;
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// Handshake sequence: Initialize the serial line, flush serial line, send magic, receive magic.
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// If the magic is not received on time, or it is not received correctly, continue to the application.
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{
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watchdogReset();
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unsigned long boot_timeout = 2000000;
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unsigned long boot_timer = 0;
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const char *ptr = entry_magic_send;
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const char *end = strlen_P(entry_magic_send) + ptr;
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const uint8_t selectedSerialPort_bak = selectedSerialPort;
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// Flush the serial line.
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while (RECV_READY) {
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watchdogReset();
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// Dummy register read (discard)
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(void)(*(char *)UDR0);
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}
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selectedSerialPort = 0; //switch to Serial0
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MYSERIAL.flush(); //clear RX buffer
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int SerialHead = rx_buffer.head;
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// Send the initial magic string.
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while (ptr != end)
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putch(pgm_read_byte(ptr ++));
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watchdogReset();
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// Wait for two seconds until a magic string (constant entry_magic) is received
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// from the serial line.
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ptr = entry_magic_receive;
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end = strlen_P(entry_magic_receive) + ptr;
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while (ptr != end) {
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while (rx_buffer.head == SerialHead) {
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watchdogReset();
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delayMicroseconds(1);
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if (++ boot_timer > boot_timeout)
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{
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// Timeout expired, continue with the application.
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selectedSerialPort = selectedSerialPort_bak; //revert Serial setting
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return 0;
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}
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}
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ch = rx_buffer.buffer[SerialHead];
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SerialHead = (unsigned int)(SerialHead + 1) % RX_BUFFER_SIZE;
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if (pgm_read_byte(ptr ++) != ch)
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{
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// Magic was not received correctly, continue with the application
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selectedSerialPort = selectedSerialPort_bak; //revert Serial setting
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return 0;
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}
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watchdogReset();
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}
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cbi(UCSR0B, RXCIE0); //disable the MarlinSerial0 interrupt
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// Send the cfm magic string.
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ptr = entry_magic_cfm;
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while (ptr != end)
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putch(pgm_read_byte(ptr ++));
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}
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spi_init();
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w25x20cl_init();
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watchdogConfig(WATCHDOG_OFF);
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/* Forever loop: exits by causing WDT reset */
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for (;;) {
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/* get character from UART */
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ch = getch();
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if(ch == STK_GET_PARAMETER) {
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unsigned char which = getch();
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verifySpace();
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/*
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* Send optiboot version as "SW version"
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* Note that the references to memory are optimized away.
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*/
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if (which == STK_SW_MINOR) {
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putch(optiboot_version & 0xFF);
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} else if (which == STK_SW_MAJOR) {
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putch(optiboot_version >> 8);
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} else {
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/*
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* GET PARAMETER returns a generic 0x03 reply for
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* other parameters - enough to keep Avrdude happy
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*/
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putch(0x03);
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}
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}
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else if(ch == STK_SET_DEVICE) {
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// SET DEVICE is ignored
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getNch(20);
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}
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else if(ch == STK_SET_DEVICE_EXT) {
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// SET DEVICE EXT is ignored
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getNch(5);
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}
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else if(ch == STK_LOAD_ADDRESS) {
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// LOAD ADDRESS
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uint16_t newAddress;
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// Workaround for the infamous ';' bug in the Prusa3D usb to serial converter.
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// Send the binary data by nibbles to avoid transmitting the ';' character.
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newAddress = getch();
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newAddress |= getch();
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newAddress |= (((uint16_t)getch()) << 8);
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newAddress |= (((uint16_t)getch()) << 8);
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// Transfer top bit to LSB in rampz
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if (newAddress & 0x8000)
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rampz |= 0x01;
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else
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rampz &= 0xFE;
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newAddress += newAddress; // Convert from word address to byte address
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address = newAddress;
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verifySpace();
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}
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else if(ch == STK_UNIVERSAL) {
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// LOAD_EXTENDED_ADDRESS is needed in STK_UNIVERSAL for addressing more than 128kB
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if ( AVR_OP_LOAD_EXT_ADDR == getch() ) {
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// get address
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getch(); // get '0'
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rampz = (rampz & 0x01) | ((getch() << 1) & 0xff); // get address and put it in rampz
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getNch(1); // get last '0'
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// response
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putch(0x00);
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}
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else {
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// everything else is ignored
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getNch(3);
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putch(0x00);
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}
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}
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/* Write memory, length is big endian and is in bytes */
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else if(ch == STK_PROG_PAGE) {
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// PROGRAM PAGE - we support flash programming only, not EEPROM
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uint8_t desttype;
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uint8_t *bufPtr;
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pagelen_t savelength;
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// Read the page length, with the length transferred each nibble separately to work around
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// the Prusa's USB to serial infamous semicolon issue.
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length = ((pagelen_t)getch()) << 8;
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length |= ((pagelen_t)getch()) << 8;
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length |= getch();
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length |= getch();
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savelength = length;
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// Read the destination type. It should always be 'F' as flash.
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desttype = getch();
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// read a page worth of contents
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bufPtr = buff;
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do *bufPtr++ = getch();
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while (--length);
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// Read command terminator, start reply
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verifySpace();
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if (desttype == 'E') {
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while (1) ; // Error: wait for WDT
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} else {
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uint32_t addr = (((uint32_t)rampz) << 16) | address;
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// During a single bootloader run, only erase a 64kB block once.
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// An 8bit bitmask 'pages_erased' covers 512kB of FLASH memory.
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if ((address == 0) && (pages_erased & (1 << (addr >> 16))) == 0) {
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w25x20cl_wait_busy();
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w25x20cl_enable_wr();
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w25x20cl_block64_erase(addr);
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pages_erased |= (1 << (addr >> 16));
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}
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w25x20cl_wait_busy();
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w25x20cl_enable_wr();
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w25x20cl_page_program(addr, buff, savelength);
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w25x20cl_wait_busy();
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w25x20cl_disable_wr();
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}
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}
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/* Read memory block mode, length is big endian. */
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else if(ch == STK_READ_PAGE) {
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uint32_t addr = (((uint32_t)rampz) << 16) | address;
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register pagelen_t i;
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// Read the page length, with the length transferred each nibble separately to work around
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// the Prusa's USB to serial infamous semicolon issue.
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length = ((pagelen_t)getch()) << 8;
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length |= ((pagelen_t)getch()) << 8;
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length |= getch();
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length |= getch();
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// Read the destination type. It should always be 'F' as flash. It is not checked.
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(void)getch();
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verifySpace();
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w25x20cl_wait_busy();
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w25x20cl_rd_data(addr, buff, length);
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for (i = 0; i < length; ++ i)
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putch(buff[i]);
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}
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/* Get device signature bytes */
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else if(ch == STK_READ_SIGN) {
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// READ SIGN - return what Avrdude wants to hear
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verifySpace();
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putch(W25X20CL_SIGNATURE_0);
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putch(W25X20CL_SIGNATURE_1);
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putch(W25X20CL_SIGNATURE_2);
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}
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else if (ch == STK_LEAVE_PROGMODE) { /* 'Q' */
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// Adaboot no-wait mod
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watchdogConfig(WATCHDOG_16MS);
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verifySpace();
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}
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else {
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// This covers the response to commands like STK_ENTER_PROGMODE
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verifySpace();
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}
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putch(STK_OK);
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}
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}
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