ATtiny13 >> Assembly
Self-Programming the Flash
參考資訊：
1. self-programming-tiny13-solved
Program Flash的操作都是以Page為單位，一個Page是16 Words(32 Bytes)，Z(r32:r30)暫存器是位址，r1:r0則是Word的資料，唯一要注意的地方是，填寫的位址是0x00開始
main.s
.equ SPMCSR, 0x37 .org 0x0000 rjmp main .org 0x0020 main: rcall program_flash loop: rjmp loop program_flash: ; erase ldi r30, 0x00 ldi r31, 0x01 ldi r16, 0x03 out SPMCSR, r16 spm ; fill (0x100: 0x50, 0xa0, 0x5a, 0xa1...) ldi r30, 0x00 ldi r31, 0x00 ldi r18, 0x50 ldi r19, 0xa0 ldi r17, 16 0: mov r0, r18 mov r1, r19 ldi r16, 0x01 out SPMCSR, r16 spm inc r18 inc r19 inc r30 inc r30 dec r17 tst r17 brne 0b ; write ldi r30, 0x00 ldi r31, 0x01 ldi r16, 0x05 out SPMCSR, r16 spm ret
編譯和燒錄
$ avr-as -mmcu=attiny13 -o main.o main.s $ avr-ld -o main.elf main.o $ avr-objcopy --output-target=ihex main.elf main.ihex $ sudo avrdude -c usbasp -p t13 -B 1024 -U flash:w:main.ihex:i
接著讀取Flash
$ sudo avrdude -c usbasp -p t13 -B 1024 -U flash:r:flash.bin:r
完成
