用输入捕获测量方波占空比时为什么只有高电平时间对而低电平时间不准。原子哥求帮忙

chenjinji

[mw_shl_code=c,true]void TIM2_IRQHandler(void) { if(((TIM2CH1_CAPTURE_STA&0XC0)==0)) { if (TIM_GetITStatus(TIM2, TIM_IT_CC1) != RESET)[/mw_shl_code] [mw_shl_code=c,true] { if(TIM2CH1_CAPTURE_STA==0X20) { TIM2CH1_CAPTURE_STA=0X80; TIM2CH1_CAPTURE_VAL2=TIM_GetCapture1(TIM2); TIM2CH1_CAPTURE_VAL=0; TIM_SetCounter(TIM2,0); TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Rising); [/mw_shl_code] [mw_shl_code=c,true] } [/mw_shl_code] [mw_shl_code=c,true] if(TIM2CH1_CAPTURE_STA==0) { TIM2CH1_CAPTURE_STA=0X40; [/mw_shl_code] [mw_shl_code=c,true] TIM2CH1_CAPTURE_VAL=TIM_GetCapture1(TIM2); TIM2CH1_CAPTURE_VAL2=0; TIM_SetCounter(TIM2,0); TIM_OC1PolarityConfig(TIM2,TIM_ICPolarity_Falling); } } } TIM_ClearITPendingBit(TIM2, TIM_IT_CC1|TIM_IT_Update); [/mw_shl_code] [mw_shl_code=c,true] [/mw_shl_code] [mw_shl_code=c,true] [/mw_shl_code]

[mw_shl_code=c,true]   	while(1)
	{
		
		
	  if(TIM2CH1_CAPTURE_STA&0X40)//??????????????????????
		{
			
			temp1=TIM2CH1_CAPTURE_VAL;	[/mw_shl_code]
[mw_shl_code=c,true]                        printf("H:%d us\r\n",temp1);				[/mw_shl_code]
[mw_shl_code=c,true]                       TIM2CH1_CAPTURE_STA=0x20;

 		}

		
		
		if(TIM2CH1_CAPTURE_STA&0X80)
		{
		 
			temp=TIM2CH1_CAPTURE_VAL2;				 [/mw_shl_code]
[mw_shl_code=c,true]                         printf("zong:%d us\r\n",temp);        [/mw_shl_code]
[mw_shl_code=c,true]                         TIM2CH1_CAPTURE_STA=0;			 		[/mw_shl_code]
[mw_shl_code=c,true]                     }
		
	}[/mw_shl_code]
[/mw_shl_code]
[mw_shl_code=c,true]} [/mw_shl_code]

正点原子

你的原理是什么？