TIM+PWM输出+输入捕获测 频率+占空比（HAL库）
一：PWM输出（TIM2_CH1）
HAL_TIM_PWM_Start(&htim2,TIM_CHANNEL_1);二：输入捕获测（TIM1 CH1+CH2）
三：开启CH1和CH2的中断![]()
四：初始化中断
HAL_TIM_IC_Start_IT(&htim1,TIM_CHANNEL_1); HAL_TIM_IC_Start_IT(&htim1,TIM_CHANNEL_2);五：重新编写回调函数
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim) { switch (htim->Channel) { case HAL_TIM_ACTIVE_CHANNEL_1: CRR1_VALUE = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1); Frequency = 1000000.0f / CRR1_VALUE; i++; break; case HAL_TIM_ACTIVE_CHANNEL_2: CRR2_VALUE = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2); DutyCycle = ((float)CRR2_VALUE / CRR1_VALUE) * 100; j++; break; default: break; } }