stm32hal库捕获pwm频率
时间: 2023-10-06 21:09:06 浏览: 141
stm32输出pwm波
要使用STM32HAL库捕获PWM频率,可以按照以下步骤进行操作:
1. 配置TIM定时器,使其工作在输入捕获模式。
```c
TIM_HandleTypeDef htim;
TIM_IC_InitTypeDef sConfigIC;
htim.Instance = TIMx;
htim.Init.Prescaler = 0;
htim.Init.CounterMode = TIM_COUNTERMODE_UP;
htim.Init.Period = 0xFFFF;
htim.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
if (HAL_TIM_IC_Init(&htim) != HAL_OK)
{
Error_Handler();
}
sConfigIC.ICPolarity = TIM_ICPOLARITY_RISING;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
if (HAL_TIM_IC_ConfigChannel(&htim, &sConfigIC, TIM_CHANNEL_x) != HAL_OK)
{
Error_Handler();
}
```
2. 在HAL_TIM_IC_CaptureCallback()中获取捕获值并计算频率。
```c
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
if (htim->Channel == TIM_CHANNEL_x)
{
uint32_t captureValue = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_x);
uint32_t timerValue = __HAL_TIM_GET_COUNTER(htim);
uint32_t frequency = HAL_RCC_GetPCLK1Freq() / (htim->Init.Prescaler + 1) / captureValue;
// do something with the frequency value
}
}
```
3. 启动定时器并启用输入捕获中断。
```c
HAL_TIM_Base_Start(&htim);
HAL_TIM_IC_Start_IT(&htim, TIM_CHANNEL_x);
```
注意,上述代码中的TIM_CHANNEL_x需要替换为实际使用的定时器通道号。另外,要确保输入PWM信号的极性与上述代码中的ICPolarity一致。
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