STM32测量不同频率方波的相位差hal库
时间: 2023-09-27 11:05:31 浏览: 63
要测量不同频率的方波的相位差,可以使用定时器计数器和输入捕获模式。下面是使用HAL库实现的代码示例:
```c
#include "stm32f4xx_hal.h"
TIM_HandleTypeDef htim2;
uint32_t ic1Value = 0, ic2Value = 0;
float phaseDiff = 0;
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
if (htim->Instance == TIM2)
{
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
{
ic1Value = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
}
else if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
{
ic2Value = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
phaseDiff = ((float)(ic2Value - ic1Value) / (float)htim->Init.Period) * 360.0;
}
}
}
int main(void)
{
HAL_Init();
__HAL_RCC_TIM2_CLK_ENABLE();
htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 999;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
HAL_TIM_IC_Init(&htim2);
TIM_IC_InitTypeDef sConfigIC;
sConfigIC.ICPolarity = TIM_ICPOLARITY_RISING;
sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
sConfigIC.ICFilter = 0;
HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_1);
HAL_TIM_IC_ConfigChannel(&htim2, &sConfigIC, TIM_CHANNEL_2);
HAL_TIM_Base_Start(&htim2);
HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2);
while (1)
{
}
}
```
在该代码中,定时器TIM2被用来计数。输入捕获模式被配置在通道1和通道2上。当捕获到通道1的输入时,将其值保存在ic1Value变量中。当捕获到通道2的输入时,将其值保存在ic2Value变量中,并计算相位差phaseDiff。在main()函数中,启动了定时器和输入捕获模式,并在无限循环中等待输入捕获中断的触发。
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