127 lines
4.4 KiB
C
Executable File
127 lines
4.4 KiB
C
Executable File
/*-------------------------------------------------------------------------/
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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 sdescribed 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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/ Modified by Steve Chamberlin for Floppy Emu, October 2013
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/-------------------------------------------------------------------------*/
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#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <util/delay.h>
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#include <string.h>
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#include "pff.h"
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#include "lcd.h"
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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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#define BUTTON_PORT PORTD
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#define BUTTON_PIN PIND
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#define SELECT_BUTTON_PIN 4
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#define PREV_BUTTON_PIN 1
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#define NEXT_BUTTON_PIN 2
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#define LED_DDR DDRB
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#define LED_PORT PORTB
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#define LED_PIN_NUMBER 3
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int main (void)
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{
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DWORD fa; /* Flash address */
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WORD br; /* Bytes read */
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// enable the pull-up resistor for the user buttons
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BUTTON_PORT |= (1<<SELECT_BUTTON_PIN);
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BUTTON_PORT |= (1<<PREV_BUTTON_PIN);
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BUTTON_PORT |= (1<<NEXT_BUTTON_PIN);
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_delay_ms(10);
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// if PREV and SELECT are pressed, try to perform an application update
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if (bit_is_clear(BUTTON_PIN, PREV_BUTTON_PIN) &&
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bit_is_clear(BUTTON_PIN, SELECT_BUTTON_PIN))
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{
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// set LED as output
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LED_DDR |= (1<<LED_PIN_NUMBER);
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LcdInit();
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LcdString(PSTR("FLOPPYXEMUXBOOTLOADER"));
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LcdGoto(0,2);
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pf_mount(&Fatfs); /* Initialize file system */
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if (pf_open("femu.bin") == FR_OK) /* Open application file */
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{
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LcdString(PSTR("FLASHINGXFEMUQBINXQQQ"));
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for (fa = 0; fa < BOOT_ADR; fa += SPM_PAGESIZE) /* Update all application pages */
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{
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flash_erase(fa); /* Erase a page */
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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 (br) flash_write(fa, Buff); /* Write it if the data is available */
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// blink the LED while writing
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LED_PORT ^= (1<<LED_PIN_NUMBER);
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}
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}
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else
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{
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// couldn't open the application file
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LcdString(PSTR("FEMUQBINXNOTXFOUND"));
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}
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// wait for all buttons to be released
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while (bit_is_clear(BUTTON_PIN, PREV_BUTTON_PIN) ||
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bit_is_clear(BUTTON_PIN, SELECT_BUTTON_PIN) ||
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bit_is_clear(BUTTON_PIN, NEXT_BUTTON_PIN))
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{}
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}
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if (pgm_read_word(0) != 0xFFFF) /* Start application if exist */
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((void(*)(void))0)();
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/* No application, Halt. */
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LcdInit();
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LcdGoto(0,0);
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LcdString(PSTR("ERRORZXFLASHXISXEMPTY"));
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for (;;) ;
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}
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