捕获实验中同一个else里面放语句顺序不同差别这么大！！！

15721227 · 发表于 2015-10-11 18:40:05

[mw_shl_code=c,true]oid TIM5_IRQHandler(void) { if((TIM5CH1_CAPTURE_STA&0X80)==0)//还未成功捕获 { if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET) { if(TIM5CH1_CAPTURE_STA&0X40)//已经捕获到高电平了 { if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)//高电平太长了 { TIM5CH1_CAPTURE_STA|=0X80;//标记成功捕获了一次 TIM5CH1_CAPTURE_VAL=0XFFFF; }else TIM5CH1_CAPTURE_STA++; } } if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//捕获1发生捕获事件 { if(TIM5CH1_CAPTURE_STA&0X40) //捕获到一个下降沿 { TIM5CH1_CAPTURE_STA|=0X80; //标记成功捕获到一次高电平脉宽 TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5); TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=0 设置为上升沿捕获 }else //还未开始,第一次捕获上升沿 { TIM5CH1_CAPTURE_STA=0; //清空 TIM5CH1_CAPTURE_VAL=0; TIM_SetCounter(TIM5,0); TIM5CH1_CAPTURE_STA|=0X40; //标记捕获到了上升沿 TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //CC1P=1 设置为下降沿捕获 } } } TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //清除中断标志位 } [/mw_shl_code]

else
{
TIM5CH1_CAPTURE_STA=0;
TIM5CH1_CAPTURE_VAL=0;
TIM_SetCounter(TIM5,0);
TIM5CH1_CAPTURE_STA|=0X40; TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);
}
写成
{
TIM5CH1_CAPTURE_STA|=0X40;
TIM5CH1_CAPTURE_STA=0;
TIM5CH1_CAPTURE_VAL=0;
TIM_SetCounter(TIM5,0); TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling);
}
就没有结果显示！！！！
[mw_shl_code=c,true] [/mw_shl_code]