其实这篇的1Hz灯，就是在上一篇的基础上添加了SysTick滴答时钟。
main.c代码如下- #include "MK64F12.h"
- #include "../driver/inc/led.h"
- #include "../driver/inc/systick.h"
- int main(void)
- {
- led_init();
- systick_init();
- while(1)
- {
- // PTB->PSOR = 1 << 22;
- // PTB->PCOR = 1 << 22;
- }
- }
- #include "../inc/systick.h"
- static int tim = 0;
- int
- systick_init(void)
- {
- SysTick_Config(SystemCoreClock / 1000);
- return 0;
- }
- void SysTick_Handler()
- {
- static int tt = 0;
- if(tim++ - tt > 500)
- {
- tt = tim;
- PTB->PTOR |= 1 << 22;
- }
- }
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