AT91SAM7S64 >> Assembly
LED
參考資訊：
1. pdf
2. pid
3. sam7s_samples
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
{
ram : ORIGIN = 0x00200000, LENGTH = 16K
rom : ORIGIN = 0x00100000, LENGTH = 64K
}
SECTIONS
{
.text : { *(.text*) } > rom
.bss : { *(.bss*) } > ram
}
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
