WATCHDOG TIMER
![](https://img.laitimes.com/img/_0nNw4CM6IyYiwiM6ICdiwiI0NXYFhGd192UvwVe0lmdhJ3ZvwFM38CXlZHbvN3cpR2Lc1TPB10QGtWUCpEMJ9CXsxWam9CXwADNvwVZ6l2c052bm9CXUJDT1wkNhVzLcRnbvZ2LcZXUYpVd1kmYr50MZV3YyI2cKJDT29GRjBjUIF2LcRHelR3LcJzLctmch1mclRXY39DO4cjNxYTNzETNxkDM3EDMy8CX0Vmbu4GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.jpg)
原理圖
手冊
舉例
start.S
.globl _start
_start:
/* 關看門狗 */
/* 往WTCON(0x53000000)寫0 */
ldr r0, =
mov r1, #0
str r1, [r0] @ str, store,
/* 設定GPFCON讓GPF5作為輸出引腳 */
ldr r1, =
mov r0, #(1<<10)
str r0, [r1]
/* 設定GPFDAT讓GPF5輸出0 */
ldr r1, =
mov r0, #0
str r0, [r1]
/* 無限循環 */
halt:
b halt
Makefile
led.bin: start.o
arm-linux-gnueabihf-ld -Ttext -o led.elf start.o
arm-linux-gnueabihf-objcopy -O binary led.elf led.bin
arm-linux-gnueabihf-objdump -D led.elf > led.dis
start.o : start.S
arm-linux-gnueabihf-gcc -o start.o start.S -c
clean:
rm *.o led.elf led.bin led.dis