260 lines
7.8 KiB
C
260 lines
7.8 KiB
C
/*-------------------------------------------------------------------------/
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/ Stand-alone MMC boot loader R0.01
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/--------------------------------------------------------------------------/
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/
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/ Copyright (C) 2010, ChaN, all right reserved.
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/
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/ * This software is a free software and there is NO WARRANTY.
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/ * No restriction on use. You can use, modify and redistribute it for
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/ personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
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/ * Redistributions of source code must retain the above copyright notice.
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/
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/--------------------------------------------------------------------------/
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/ Dec 6, 2010 R0.01 First release
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/--------------------------------------------------------------------------/
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/ This is a stand-alone MMC/SD boot loader for megaAVRs. It requires a 4KB
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/ boot section for code, four GPIO pins for MMC/SD as shown in sch.jpg and
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/ nothing else. To port the boot loader into your project, follow the
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/ instruction described below.
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/
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/ 1. Setup the hardware. Attach a memory card socket to the any GPIO port
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/ where you like. Select boot size at least 4KB for the boot loader with
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/ BOOTSZ fuses and enable boot loader with BOOTRST fuse.
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/
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/ 2. Setup the software. Change the four port definitions in the asmfunc.S.
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/ Change MCU_TARGET, BOOT_ADR and MCU_FREQ in the Makefile. The BOOT_ADR
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/ is a BYTE address of boot section in the flash. Build the boot loader
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/ and write it to the device with a programmer.
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/
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/ 3. Build the application program and output it in binary form instead of
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/ hex format. Rename the file "app.bin" and put it into the memory card.
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/
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/ 4. Insert the card and turn the target power on. When the boot loader found
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/ the application file, the file is written into the flash memory prior to
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/ start the application program. On-board LED lights (if exist) during
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/ the flash programming operation.
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/
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/-------------------------------------------------------------------------*/
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const char filename[13] ="FIRMWARE.BIN\0"; // EDIT FILENAME HERE
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <avr/eeprom.h>
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#include <util/delay.h>
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#include <string.h>
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#include "pff/src/pff.h"
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#include <avr/wdt.h> //Watchdog
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// The following code is recommended in http://avr-libc.nongnu.org/user-manual/group__avr__watchdog.html but is disabled for now because avr_boot doesn't currently do anything with mcusr_mirror so for now we will only reset MCUSR and disable WDT.
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//uint8_t mcusr_mirror __attribute__ ((section (".noinit")));void get_mcusr(void) __attribute__((naked)) __attribute__((section(".init3")));void get_mcusr(void){mcusr_mirror = MCUSR;MCUSR = 0;wdt_disable();}
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void disable_watchdog(void) __attribute__((naked)) __attribute__((section(".init3")));
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void disable_watchdog(void)
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{
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#if defined(MCUCSR)
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MCUCSR = ~(_BV(WDRF)); //Some MCUs require the watchdog reset flag to be cleared before WDT can be disabled. & operation is skipped to spare few bytes as bits in MCUSR can only be cleared.
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#else
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MCUSR = ~(_BV(WDRF)); //Some MCUs require the watchdog reset flag to be cleared before WDT can be disabled. & operation is skipped to spare few bytes as bits in MCUSR can only be cleared.
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#endif
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wdt_disable(); //immediately disable watchdog in case it was running in the application to avoid perpetual reset loop
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}
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#if BOOT_ADR > 0xFFFF
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#define PGM_READ_BYTE(x) pgm_read_byte_far(x)
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#else
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#define PGM_READ_BYTE(x) pgm_read_byte(x)
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#endif
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#if USE_UART
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#include "uart/uart.h"
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#endif
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#if USE_LED
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void init_leds();
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void led_power_on();
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void led_power_off();
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void led_power_toggle();
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void led_write_on();
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void led_write_off();
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void led_write_toggle();
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#endif
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void flash_erase (DWORD); /* Erase a flash page (asmfunc.S) */
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void flash_write (DWORD, const BYTE*); /* Program a flash page (asmfunc.S) */
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FATFS Fatfs; // Petit-FatFs work area
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BYTE Buff[SPM_PAGESIZE]; // Page data buffer
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static uint8_t pagecmp(const DWORD fa, uint8_t buff[SPM_PAGESIZE])
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{
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UINT i;
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uint8_t b_flash,b_buff;
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for (i = 0; i < SPM_PAGESIZE; i++) {
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b_flash = PGM_READ_BYTE(fa+i);
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b_buff = buff[i];
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if ( b_flash != b_buff) {
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#if USE_UART //output first difference
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UART_puthex32(fa);UART_puts(PSTR(":"));
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UART_puthex(b_flash);UART_puts(PSTR(" "));
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UART_puthex(b_buff); UART_newline();
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#endif
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return 1;
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}
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}
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#if USE_UART //output first difference
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UART_puthex32(fa);UART_puts(PSTR(":"));
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UART_puts(PSTR("="));UART_newline();
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#endif
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return 0;
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}
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void doFlash() {
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DWORD fa; /* Flash address */
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UINT br; /* Bytes read */
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#if USE_LED
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uint8_t i;
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for(i=0;i<50;i++) { led_write_toggle();_delay_ms(100);} //Start Programming: Flash WRITE Wildly for 5 secs
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#endif
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for (fa = 0; fa < BOOT_ADR; fa += SPM_PAGESIZE) { /* Update all application pages */
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memset(Buff, 0xFF, SPM_PAGESIZE); /* Clear buffer */
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pf_read(Buff, SPM_PAGESIZE, &br); /* Load a page data */
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if (pagecmp(fa, Buff)) { /* Only flash if page is changed */
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#if USE_LED
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led_write_off();
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//led_power_on();
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#endif
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flash_erase(fa); /* Erase a page */
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flash_write(fa, Buff); /* Write it if the data is available */
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} else {
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#if USE_LED
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//led_power_off();
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led_write_on();
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#endif
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}
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}
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}
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void checkFile() {
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uint8_t fresult;
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fresult = pf_mount(&Fatfs); /* Initialize file system */
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if (fresult != FR_OK) { /* File System could not be mounted */
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#if USE_UART
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UART_puts(PSTR("File not mounted"));
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UART_newline();
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#endif
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#if USE_LED
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//uint8_t i;
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//led_write_on();
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//for(i=0;i<2*fresult;i++) { led_power_toggle();_delay_ms(500);}//Give error number while Write led is on
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//led_write_off();
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#endif
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return;
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}
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/*
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WORD flashver = eeprom_read_word((const uint16_t *)E2END - 1);
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if (flashver > 999) {
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flashver = 0;
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}
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BYTE y, tmp;
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WORD x;
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BYTE found = 0;
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for (x = flashver+10; x > flashver; x--) {
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y = x / 100;
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filename[5] = y + 0x30;
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tmp = x % 100;
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y = tmp / 10;
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filename[6] = y + 0x30;
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tmp = x % 10;
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filename[7] = tmp + 0x30;
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if (pf_open(filename) == FR_OK) { // File opens normally
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found = 1;
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doProgram();
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}
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led_power_toggle();
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}
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if (found == 0) {*/
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fresult = pf_open(filename);
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if (fresult != FR_OK) { /* File could not be opened */
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#if USE_UART
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UART_puts(PSTR("File not open"));
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UART_newline();
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#endif
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#if USE_LED
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//uint8_t i;
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//led_power_on();
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//for(i=0;i<2*fresult;i++) { led_write_toggle();_delay_ms(500);}//Give error number while Power led is on
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//led_power_off();
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#endif
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return;
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}
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doFlash();
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#if USE_LED
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led_write_off();
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//led_power_off();
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_delay_ms(2000);
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uint8_t i;
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//for(i=0;i<40;i++) { led_power_toggle();_delay_ms(50);}//SUCCESS FLASH WILDLY for 2 secs
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for(i=0;i<40;i++) { led_write_toggle();_delay_ms(50);}//SUCCESS FLASH WILDLY for 2 secs
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#endif
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}
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int main (void)
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{
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#if USE_LED
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init_leds();
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uint8_t i=0;
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#endif
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#if USE_UART
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UART_init();
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UART_puts(PSTR("AVR_BOOT"));
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UART_newline();
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#endif
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while (1) {
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#if USE_LED
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//led_power_on();_delay_ms(200);led_power_off(); //Test Power Led
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led_write_on();_delay_ms(200);led_write_off(); //Test Write Led
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#endif
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checkFile();
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if (pgm_read_word(0) != 0xFFFF) ((void(*)(void))0)(); //EXIT BOOTLOADER
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#if USE_UART
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UART_puts(PSTR("retry"));
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UART_newline();
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#endif
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#if USE_LED
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//for(i=0;i<10;i++) { led_power_toggle();_delay_ms(200);} //SOMETHING WENT WRONG: Flash Power LED
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for(i=0;i<10;i++) { led_write_toggle();_delay_ms(200);} //SOMETHING WENT WRONG: Flash Write LED
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#endif
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_delay_ms(5000); // Retry
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}
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}
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