项目内容：本人测试固定时间内2个同频率方波（频率约为：3KHz，占空比约为：50%，相位差约为：25%）的占空比、周期及相位差，固定时间约为1000个周期，且知道方波A超前于方波B。通过PWM输入模式测量方波A和方波B的占空比及周期，在方波A的上升沿中断时开启定时器，在方波B的上升沿中断时停止定时器，用于测量两者的相位差。
处理器：STM32F103ZET6，系统时钟72M
问题：占空比、周期测量正常，相位差测量偶尔会出现异常，异常一般出现在开始测量的第一个相位差，希望大神帮忙分析？
- /**
- * [url=home.php?mod=space&uid=247401]@brief[/url] Input Capture callback in non blocking mode
- * @param htim : TIM IC handle
- * @retval None
- */
- void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
- {
-
- /* Prevent unused argument(s) compilation warning */
- UNUSED(htim);
- /* NOTE : This function Should not be modified, when the callback is needed,
- the __HAL_TIM_IC_CaptureCallback could be implemented in the user file
- */
-
- if(htim==&htim3)
- {
- //CH1上升沿中断
- if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
- {
- switch(a)
- {
- case 0:
- HAL_TIM_IC_Start_IT(&htim4,TIM_CHANNEL_1);//开启方波B的PWM输入模式
- HAL_TIM_IC_Start_IT(&htim4,TIM_CHANNEL_2);//开启方波B的PWM输入模式
- a=1;
- break;
- case 1:
- IC1Value1 = HAL_TIM_ReadCapturedValue(&htim3, TIM_CHANNEL_1);
- HAL_TIM_Base_Start(&htim6);
- duty_A = IC1Value2*1.0/IC1Value1;
- duty_Asum+=duty_A;
- if(flag_z==1)//规定时间到后停止测量
- {
- HAL_TIM_IC_Stop_IT(&htim3,TIM_CHANNEL_1);
- HAL_TIM_IC_Stop_IT(&htim3,TIM_CHANNEL_2);
- condition++;
- }
- if((duty_A<0.40) | (duty_A>0.60))//方波A的占空比不符合条件
- {
- HAL_GPIO_WritePin(GPIOG, LED3_Pin, GPIO_PIN_RESET);//LED报警
- //condition=0;
- }
- break;
- }
- }
- //CH2下降沿中断
- else if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
- {
- IC1Value2 = HAL_TIM_ReadCapturedValue(&htim3, TIM_CHANNEL_2);
- A++;
- }
- }
- else if(htim==&htim4)
- {
- if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
- {
- switch(b)
- {
- case 0:b=1;break;
- case 1:
- IC1Value3 = HAL_TIM_ReadCapturedValue(&htim4, TIM_CHANNEL_1);
- HAL_TIM_Base_Stop(&htim6);
- duty_B = IC1Value4*1.0/IC1Value3;
- duty_Bsum+=duty_B;
- IC1ValueAB=htim6.Instance->CNT;
- phase_AB = IC1ValueAB*1.0/IC1Value1;
- phase_ABsum+=phase_AB;
- htim6.Instance->CNT=0;
- if(flag_z==1)//规定时间到后停止测量
- {
- HAL_TIM_IC_Stop_IT(&htim4,TIM_CHANNEL_1);
- HAL_TIM_IC_Stop_IT(&htim4,TIM_CHANNEL_2);
- condition++;
- }
- if((duty_B < 0.40)|(duty_B > 0.60))//方波B的占空比不符合条件
- {
- HAL_GPIO_WritePin(GPIOG,LED4_Pin,GPIO_PIN_RESET);//LED4报警
- //condition=0;
- }
- else if((phase_AB < 0.20)|(phase_AB > 0.30))//相位差不符合条件
- {
- phase=phase_AB;
- HAL_GPIO_WritePin(GPIOC,LED5_Pin,GPIO_PIN_RESET);//LED5报警
- //condition=0;
- }
- break;
- }
- }
- //CH2下降沿中断
- else if(htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
- {
- IC1Value4 = HAL_TIM_ReadCapturedValue(&htim4, TIM_CHANNEL_2);
- B++;
- }
- }
- }
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