學習筆記，高手勿笑！
組合語言迴圈點燈程式：
start.s
/******************/
/*迴圈點亮4盞led燈*/
/******************/
.globl _start
_start:
/* 硬體相關的設定 */
/* peri port setup */
ldr r0, =0x70000000
orr r0, r0, #0x13
mcr p15,0,r0,c15,c2,4 @ 256m(0x70000000-0x7fffffff)
/* 關看門狗 */
/* 往wtcon(0x7e004000)寫0 */
ldr r0, =0x7e004000
mov r1, #0
str r1, [r0]
/* 設定gpmcon讓gpm0-3作為輸出引腳 */
/*gpmcon = 0x7f008820,gpmdat 0x7f008824*/
ldr r0, =0x7f008820
ldr r1, =0x1111
str r1, [r0]
/* 設定gpmdat讓gpm3輸出0 */
ldr r1, =0x7f008824
mov r0, #0
str r0, [r1]
bl delay
loop:
/* 點亮led1 */
mov r0, #0xe
str r0,[r1]
bl delay
/* 點亮led2 */
mov r0, #0xd
str r0,[r1]
bl delay
/* 點亮led3 */
mov r0, #0xb
str r0,[r1]
bl delay
/* 點亮led4 */
mov r0, #0x7
str r0,[r1]
bl delay
b loop
/*延時*/
delay:
mov r2, #0x10000
delay_loop:
sub r2, r2,#1
cmp r2, #0
bne delay_loop
mov pc, lr
halt:
b halt
led.bin: start.o
arm-linux-ld -ttext 0 -o led.elf start.o
arm-linux-objcopy -o binary led.elf led.bin
arm-linux-objdump -d led.elf > led.dis
start.o: start.s
arm-linux-gcc -o start.o -c start.s
clean:
rm -f start.o led.dis led.bin led.elf
c語言迴圈點燈程式：
start.s
.globl _start
_start:
/* 硬體相關的設定 */
/* peri port setup */
ldr r0, =0x70000000
orr r0, r0, #0x13
mcr p15,0,r0,c15,c2,4
/* 關看門狗 */
/* 往wtcon(0x7e004000)寫0 */
ldr r0, =0x7e004000
mov r1, #0
str r1, [r0]
/*設定c語言語言環境*/
ldr sp, =8*1024
bl main
halt:
b halt
/*gpmcon = 0x7f008820,gpmdat 0x7f008824*/
#define gpmcon (*(volatile unsigned long *)0x7f008820)
#define gpmdat (*(volatile unsigned long *)0x7f008824)
void delay()
int main()
{ int i;
gpmcon = 0x1111;
gpmdat = 0xc;
while(1)
{ for(i = 0; i < 4;i++)
{ gpmdat = ~(1<
makefile
led.bin: start.o led.o
arm-linux-ld -ttext 0 -o led.elf start.o led.o
arm-linux-objcopy -o binary led.elf led.bin
arm-linux-objdump -d led.elf > led.dis
start.o : start.s
arm-linux-gcc -o start.o start.s -c -o2
led.o : led.c
arm-linux-gcc -o led.o led.c -c -o2
clean:
rm *.o led.elf led.bin led.dis
OK6410裸機程式 hello world
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include include include include include include include include include include include include include include include include include define device ...