本帖最后由 laosun2008 于 2017-5-8 15:41 编辑
我在T0_EXT(PA7)上装了一个按键,每次按键触发CAPIF中断好几次,并且捕获值一直为零
主函数代码如下:int32_t main(void)
{
//初始始化部份省略
NVIC_EnableIRQ(TMR0_IRQn);
TIMER_Open(TIMER0, TIMER_CONTINUOUS_MODE, 1);
TIMER_SET_PRESCALE_VALUE(TIMER0, 0);
TIMER_SET_CMP_VALUE(TIMER0, 0xFFFFFF);
TIMER_EnableEventCounter(TIMER0, TIMER_COUNTER_FALLING_EDGE);//使能事件计 数模式
TIMER_EnableCapture(TIMER0, TIMER_CAPTURE_FREE_COUNTING_MODE, TIMER_CAPTURE_FALLING_EDGE);//使能捕获模式
TIMER_EnableCaptureDebounce(TIMER0); TIMER_EnableInt(TIMER0);
TIMER_EnableCaptureInt(TIMER0);
TIMER_Start(TIMER0);
for(;;);
return 0;
}
中断函数
static int cnt=0;
void TMR0_IRQHandler(void)
{
if(TIMER_GetCaptureIntFlag(TIMER0) == 1)
{
uint32_t au32CAPValue;
/* Clear Timer0 capture trigger interrupt flag */
au32CAPValue = TIMER_GetCaptureData(TIMER0)
TIMER_ClearCaptureIntFlag(TIMER0);
printf("capture int_cnt=%d , captureVal=%d \n",cnt++,au32CAPValue);
}
}
下面是芯片运行时的引脚状态图
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