微處理器 - Microchip ATtiny13 - Assembly - LED

參考資訊：
https://www.microchip.com/en-us/product/attiny13#Documentation
https://nerdathome.blogspot.com/2008/04/avr-as-usage-tutorial.html

DDRB(I/O方向)、PORTB(I/O輸出)


main.s

    .equ PINB,  0x16
    .equ DDRB,  0x17
    .equ PORTB, 0x18
 
    .org 0x0000
    rjmp main
 
    .org 0x0010
main:
    sbi DDRB, 1
 
loop:
    sbi PORTB, 1
    rcall delay
    cbi PORTB, 1
    rcall delay
    rjmp loop
 
delay:
    ldi r24, 0xff
    ldi r25, 0x80
d0:
    sbiw r24, 1
    brne d0
    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
    avrdude: set SCK frequency to 500 Hz
    avrdude: AVR device initialized and ready to accept instructions

    Reading | ################################################## | 100% 0.20s

    avrdude: Device signature = 0x1e9007 (probably t13)
    avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
           To disable this feature, specify the -D option.
    avrdude: erasing chip
    avrdude: set SCK frequency to 500 Hz
    avrdude: reading input file "main.ihex"
    avrdude: writing flash (38 bytes):

    Writing | ################################################## | 100% 4.51s

    avrdude: 38 bytes of flash written
    avrdude: verifying flash memory against main.ihex:
    avrdude: load data flash data from input file main.ihex:
    avrdude: input file main.ihex contains 38 bytes
    avrdude: reading on-chip flash data:

    Reading | ################################################## | 100% 4.26s

    avrdude: verifying ...
    avrdude: 38 bytes of flash verified

    avrdude: safemode: Fuses OK (E:FF, H:FF, L:6A)

    avrdude done.  Thank you.

完成