微處理器 - Microchip AT91SAM7S64 - Assembly - LED

參考資訊：
https://github.com/dwelch67/sam7s_samples
https://ww1.microchip.com/downloads/en/DeviceDoc/6175s.pdf
https://ww1.microchip.com/downloads/en/DeviceDoc/doc6175.pdf

Enable


Output


Output High


Output Low


main.s

    .equ PMC_PCER, 0xfffffc10
    .equ PIO_PER,  0xfffff400
    .equ PIO_OER,  0xfffff410
    .equ PIO_SODR, 0xfffff430
    .equ PIO_CODR, 0xfffff434
 
    .text
    .align 2
    .global _start
_start:    b reset
_undef:    b .
_swi:      b .
_pabort:   b .
_dabort:   b .
_reserved: b .
_irq:      b .
_fiq:      b .

reset:
    ldr r0, =PMC_PCER
    ldr r1, =4
    str r1, [r0]
 
    ldr r0, =PIO_PER
    ldr r1, =0x40000
    str r1, [r0]
  
    ldr r0, =PIO_OER
    ldr r1, =0x40000
    str r1, [r0]
 
loop:
    ldr r0, =PIO_SODR
    ldr r1, =0x40000
    str r1, [r0]
    mov r4, #0x300
1:
    subs r4, #1
    bne 1b
 
    ldr r0, =PIO_CODR
    ldr r1, =0x40000
    str r1, [r0]
    mov r4, #0x300
1:
    subs r4, #1
    bne 1b
    b loop
    .end

main.ld

MEMORY {
    ROM : ORIGIN = 0x00100000, LENGTH = 64K
}

SECTIONS {
    .text : {
        *(.text*)
    } > ROM
}

Makefile

all: main.bin

main.o: main.s
	arm-none-eabi-as main.s -o main.o

main.bin: main.o main.ld
	arm-none-eabi-ld main.o -T main.ld -o main.elf
	arm-none-eabi-objdump -D main.elf > main.list
	arm-none-eabi-objcopy main.elf main.bin -O binary

clean:
	rm -f *.bin *.o *.elf *.list

完成