/**********************************************************/ /* Serial Bootloader for Atmel mega8 AVR Controller */ /* */ /* ATmegaBOOT.c */ /* */ /* Copyright (c) 2003, Jason P. Kyle */ /* */ /* Hacked by DojoCorp - ZGZ - MMX - IVR */ /* Hacked by David A. Mellis */ /* */ /* This program is free software; you can redistribute it */ /* and/or modify it under the terms of the GNU General */ /* Public License as published by the Free Software */ /* Foundation; either version 2 of the License, or */ /* (at your option) any later version. */ /* */ /* This program 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 General Public */ /* License for more details. */ /* */ /* You should have received a copy of the GNU General */ /* Public License along with this program; if not, write */ /* to the Free Software Foundation, Inc., */ /* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* */ /* Licence can be viewed at */ /* http://www.fsf.org/licenses/gpl.txt */ /* */ /* Target = Atmel AVR m8 */ /**********************************************************/ #include #include #include #include #include #include //#define F_CPU 16000000 /* We, Malmoitians, like slow interaction * therefore the slow baud rate ;-) */ //#define BAUD_RATE 9600 /* 6.000.000 is more or less 8 seconds at the * speed configured here */ //#define MAX_TIME_COUNT 6000000 #define MAX_TIME_COUNT (F_CPU>>1) ///#define MAX_TIME_COUNT_MORATORY 1600000 /* SW_MAJOR and MINOR needs to be updated from time to time to avoid warning message from AVR Studio */ #define HW_VER 0x02 #define SW_MAJOR 0x01 #define SW_MINOR 0x12 // AVR-GCC compiler compatibility // avr-gcc compiler v3.1.x and older doesn't support outb() and inb() // if necessary, convert outb and inb to outp and inp #ifndef outb #define outb(sfr,val) (_SFR_BYTE(sfr) = (val)) #endif #ifndef inb #define inb(sfr) _SFR_BYTE(sfr) #endif /* defines for future compatibility */ #ifndef cbi #define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit)) #endif #ifndef sbi #define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit)) #endif /* Adjust to suit whatever pin your hardware uses to enter the bootloader */ #define eeprom_rb(addr) eeprom_read_byte ((uint8_t *)(addr)) #define eeprom_rw(addr) eeprom_read_word ((uint16_t *)(addr)) #define eeprom_wb(addr, val) eeprom_write_byte ((uint8_t *)(addr), (uint8_t)(val)) /* Onboard LED is connected to pin PB5 */ #define LED_DDR DDRB #define LED_PORT PORTB #define LED_PIN PINB #define LED PINB5 #define SIG1 0x1E // Yep, Atmel is the only manufacturer of AVR micros. Single source :( #define SIG2 0x93 #define SIG3 0x07 #define PAGE_SIZE 0x20U //32 words void putch(char); char getch(void); void getNch(uint8_t); void byte_response(uint8_t); void nothing_response(void); union address_union { uint16_t word; uint8_t byte[2]; } address; union length_union { uint16_t word; uint8_t byte[2]; } length; struct flags_struct { unsigned eeprom : 1; unsigned rampz : 1; } flags; uint8_t buff[256]; //uint8_t address_high; uint8_t pagesz=0x80; uint8_t i; //uint8_t bootuart0=0,bootuart1=0; void (*app_start)(void) = 0x0000; int main(void) { uint8_t ch,ch2; uint16_t w; //cbi(BL_DDR,BL); //sbi(BL_PORT,BL); asm volatile("nop\n\t"); /* check if flash is programmed already, if not start bootloader anyway */ //if(pgm_read_byte_near(0x0000) != 0xFF) { /* check if bootloader pin is set low */ //if(bit_is_set(BL_PIN,BL)) app_start(); //} /* initialize UART(s) depending on CPU defined */ /* m8 */ UBRRH = (((F_CPU/BAUD_RATE)/16)-1)>>8; // set baud rate UBRRL = (((F_CPU/BAUD_RATE)/16)-1); UCSRB = (1<> 8; //UCSRA = 0x00; //UCSRC = 0x86; //UCSRB = _BV(TXEN)|_BV(RXEN); /* this was giving uisp problems, so I removed it; without it, the boot works on with uisp and avrdude on the mac (at least). */ //putch('\0'); //uint32_t l; //uint32_t time_count; //time_count=0; /* set LED pin as output */ sbi(LED_DDR,LED); for (i = 0; i < 16; i++) { outb(LED_PORT, inb(LED_PORT) ^ _BV(LED)); _delay_loop_2(0); } //for (l=0; l<40000000; l++) //outb(LED_PORT, inb(LED_PORT) ^= _BV(LED)); /* flash onboard LED three times to signal entering of bootloader */ //for(i=0; i<3; ++i) { //for(l=0; l<40000000; ++l); //sbi(LED_PORT,LED); //for(l=0; l<40000000; ++l); //cbi(LED_PORT,LED); //} /* see comment at previous call to putch() */ //putch('\0'); // this line is needed for the synchronization of the programmer /* forever */ for (;;) { //if((inb(UCSRA) & _BV(RXC))){ /* get character from UART */ ch = getch(); /* A bunch of if...else if... gives smaller code than switch...case ! */ /* Hello is anyone home ? */ if(ch=='0') { nothing_response(); } /* Request programmer ID */ /* Not using PROGMEM string due to boot block in m128 being beyond 64kB boundry */ /* Would need to selectively manipulate RAMPZ, and it's only 9 characters anyway so who cares. */ else if(ch=='1') { if (getch() == ' ') { putch(0x14); putch('A'); putch('V'); putch('R'); putch(' '); putch('I'); putch('S'); putch('P'); putch(0x10); } } /* AVR ISP/STK500 board commands DON'T CARE so default nothing_response */ else if(ch=='@') { ch2 = getch(); if (ch2>0x85) getch(); nothing_response(); } /* AVR ISP/STK500 board requests */ else if(ch=='A') { ch2 = getch(); if(ch2==0x80) byte_response(HW_VER); // Hardware version else if(ch2==0x81) byte_response(SW_MAJOR); // Software major version else if(ch2==0x82) byte_response(SW_MINOR); // Software minor version //else if(ch2==0x98) byte_response(0x03); // Unknown but seems to be required by avr studio 3.56 else byte_response(0x00); // Covers various unnecessary responses we don't care about } /* Device Parameters DON'T CARE, DEVICE IS FIXED */ else if(ch=='B') { getNch(20); nothing_response(); } /* Parallel programming stuff DON'T CARE */ else if(ch=='E') { getNch(5); nothing_response(); } /* Enter programming mode */ else if(ch=='P') { nothing_response(); // FIXME: modified only here by DojoCorp, Mumbai, India, 20050626 //time_count=0; // exted the delay once entered prog.mode } /* Leave programming mode */ else if(ch=='Q') { nothing_response(); //time_count=MAX_TIME_COUNT_MORATORY; // once the programming is done, // we should start the application // but uisp has problems with this, // therefore we just change the times // and give the programmer 1 sec to react } /* Erase device, don't care as we will erase one page at a time anyway. */ else if(ch=='R') { nothing_response(); } /* Set address, little endian. EEPROM in bytes, FLASH in words */ /* Perhaps extra address bytes may be added in future to support > 128kB FLASH. */ /* This might explain why little endian was used here, big endian used everywhere else. */ else if(ch=='U') { address.byte[0] = getch(); address.byte[1] = getch(); nothing_response(); } /* Universal SPI programming command, disabled. Would be used for fuses and lock bits. */ else if(ch=='V') { getNch(4); byte_response(0x00); } /* Write memory, length is big endian and is in bytes */ else if(ch=='d') { length.byte[1] = getch(); length.byte[0] = getch(); flags.eeprom = 0; if (getch() == 'E') flags.eeprom = 1; for (w=0;w127) address_high = 0x01; //Only possible with m128, m256 will need 3rd address byte. FIXME //else address_high = 0x00; //address.word = address.word << 1; //address * 2 -> byte location //if ((length.byte[0] & 0x01)) length.word++; //Even up an odd number of bytes cli(); //Disable interrupts, just to be sure while(bit_is_set(EECR,EEWE)); //Wait for previous EEPROM writes to complete asm volatile( "clr r17 \n\t" //page_word_count "lds r30,address \n\t" //Address of FLASH location (in words) "lds r31,address+1 \n\t" "lsl r30 \n\t" //address * 2 -> byte location "rol r31 \n\t" "ldi r28,lo8(buff) \n\t" //Start of buffer array in RAM "ldi r29,hi8(buff) \n\t" "lds r24,length \n\t" //Length of data to be written (in bytes) "lds r25,length+1 \n\t" "sbrs r24,0 \n\t" //Even up an odd number of bytes "rjmp length_loop \n\t" "adiw r24,1 \n\t" "length_loop: \n\t" //Main loop, repeat for number of words in block "cpi r17,0x00 \n\t" //If page_word_count=0 then erase page "brne no_page_erase \n\t" "rcall wait_spm \n\t" // "wait_spm1: \n\t" // "lds r16,%0 \n\t" //Wait for previous spm to complete // "andi r16,1 \n\t" // "cpi r16,1 \n\t" // "breq wait_spm1 \n\t" "ldi r16,0x03 \n\t" //Erase page pointed to by Z "sts %0,r16 \n\t" "spm \n\t" "rcall wait_spm \n\t" // "wait_spm2: \n\t" // "lds r16,%0 \n\t" //Wait for previous spm to complete // "andi r16,1 \n\t" // "cpi r16,1 \n\t" // "breq wait_spm2 \n\t" "ldi r16,0x11 \n\t" //Re-enable RWW section "sts %0,r16 \n\t" "spm \n\t" "no_page_erase: \n\t" "ld r0,Y+ \n\t" //Write 2 bytes into page buffer "ld r1,Y+ \n\t" "rcall wait_spm \n\t" // "wait_spm3: \n\t" // "lds r16,%0 \n\t" //Wait for previous spm to complete // "andi r16,1 \n\t" // "cpi r16,1 \n\t" // "breq wait_spm3 \n\t" "ldi r16,0x01 \n\t" //Load r0,r1 into FLASH page buffer "sts %0,r16 \n\t" "spm \n\t" "inc r17 \n\t" //page_word_count++ "cpi r17,%1 \n\t" "brlo same_page \n\t" //Still same page in FLASH "write_page: \n\t" "clr r17 \n\t" //New page, write current one first "rcall wait_spm \n\t" // "wait_spm4: \n\t" // "lds r16,%0 \n\t" //Wait for previous spm to complete // "andi r16,1 \n\t" // "cpi r16,1 \n\t" // "breq wait_spm4 \n\t" "ldi r16,0x05 \n\t" //Write page pointed to by Z "sts %0,r16 \n\t" "spm \n\t" "rcall wait_spm \n\t" // "wait_spm5: \n\t" // "lds r16,%0 \n\t" //Wait for previous spm to complete // "andi r16,1 \n\t" // "cpi r16,1 \n\t" // "breq wait_spm5 \n\t" "ldi r16,0x11 \n\t" //Re-enable RWW section "sts %0,r16 \n\t" "spm \n\t" "same_page: \n\t" "adiw r30,2 \n\t" //Next word in FLASH "sbiw r24,2 \n\t" //length-2 "breq final_write \n\t" //Finished "rjmp length_loop \n\t" "wait_spm: \n\t" "lds r16,%0 \n\t" //Wait for previous spm to complete "andi r16,1 \n\t" "cpi r16,1 \n\t" "breq wait_spm \n\t" "ret \n\t" "final_write: \n\t" "cpi r17,0 \n\t" "breq block_done \n\t" "adiw r24,2 \n\t" //length+2, fool above check on length after short page write "rjmp write_page \n\t" "block_done: \n\t" "clr __zero_reg__ \n\t" //restore zero register : "=m" (SPMCR) : "M" (PAGE_SIZE) : "r0","r16","r17","r24","r25","r28","r29","r30","r31"); /* Should really add a wait for RWW section to be enabled, don't actually need it since we never */ /* exit the bootloader without a power cycle anyhow */ } putch(0x14); putch(0x10); } } /* Read memory block mode, length is big endian. */ else if(ch=='t') { length.byte[1] = getch(); length.byte[0] = getch(); if (getch() == 'E') flags.eeprom = 1; else { flags.eeprom = 0; address.word = address.word << 1; // address * 2 -> byte location } if (getch() == ' ') { // Command terminator putch(0x14); for (w=0;w < length.word;w++) { // Can handle odd and even lengths okay if (flags.eeprom) { // Byte access EEPROM read putch(eeprom_rb(address.word)); address.word++; } else { if (!flags.rampz) putch(pgm_read_byte_near(address.word)); address.word++; } } putch(0x10); } } /* Get device signature bytes */ else if(ch=='u') { if (getch() == ' ') { putch(0x14); putch(SIG1); putch(SIG2); putch(SIG3); putch(0x10); } } /* Read oscillator calibration byte */ else if(ch=='v') { byte_response(0x00); } // } else { // time_count++; // if (time_count>=MAX_TIME_COUNT) { // app_start(); // } // } } /* end of forever loop */ } void putch(char ch) { /* m8 */ while (!(inb(UCSRA) & _BV(UDRE))); outb(UDR,ch); } char getch(void) { /* m8 */ uint32_t count = 0; while(!(inb(UCSRA) & _BV(RXC))) { /* HACKME:: here is a good place to count times*/ count++; if (count > MAX_TIME_COUNT) app_start(); } return (inb(UDR)); } void getNch(uint8_t count) { uint8_t i; for(i=0;i