include "freq_meter.h"

include "ws2812b.h"

uint16_t Capture_Raise[IC_BufSize] = {0x0000}; //CH1的DMA缓冲区，用于存放上升沿捕获数据 uint16_t Capture_Fall[IC_BufSize] = {0x0000}; //CH2的DMA缓冲区，用于存放下降沿捕获数据

uint16_t Avg_Raise = 0x0000; uint16_t Avg_Fall = 0x0000;

float Freq_Capture_Freq = 0.0; //所测信号频率 float Freq_Capture_Duty = 0.0; //所测信号占空比 extern WS2812B_OBJ_T ESHL_StateLed;

uint8_t i=0; void Freq_Meter_Init(void) { //开始TIM2CH1的DMA传输 HAL_TIM_IC_Start_DMA(&PWM_In_Timer, TIM_CHANNEL_1, (uint32_t)Capture_Fall, IC_BufSize); //还原TIM2状态，然后开始TIM2CH2的DMA传输 PWM_In_Timer.State = HAL_TIM_STATE_READY; HAL_TIM_IC_Start_DMA(&PWM_In_Timer, TIM_CHANNEL_2, (uint32_t)Capture_Raise, IC_BufSize); }

void Freq_Meter_DeInit(void) { HAL_TIM_IC_Stop_DMA(&PWM_In_Timer, TIM_CHANNEL_1); HAL_TIM_IC_Stop_DMA(&PWM_In_Timer, TIM_CHANNEL_2); } void Freq_Calc(void) { Avg_Raise = 0; Avg_Fall = 0;

//取平均值 for(uint16_t i = 0; i < IC_BufSize; i++) { Avg_Raise += Capture_Raise[i]; Avg_Fall += Capture_Fall[i]; } Avg_Raise /= IC_BufSize; Avg_Fall /= IC_BufSize;

//计算频率及占空比 if(Avg_Raise != 0) { Freq_Capture_Freq = (float)TIM_Clock / (float)((TIM_PSC + 1) * Avg_Raise); Freq_Capture_Duty = (float)Avg_Fall / (float)Avg_Raise; } } // 添加全局变量跟踪DMA传输状态 uint8_t dma_ch1_complete = 0; uint8_t dma_ch2_complete = 0;

// DMA传输完成回调 void HAL_TIM_IC_CaptureCpltCallback(TIM_HandleTypeDef *htim) {

i = (i + 1) % 255; if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1) { dma_ch1_complete = 1; } else if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2) { dma_ch2_complete = 1; }

// 两个通道都完成时才计算 if (dma_ch1_complete && dma_ch2_complete) { Freq_Calc(); dma_ch1_complete = 0; dma_ch2_complete = 0;

    //  // WS2812控制
    WS2812_Set(&ESHL_StateLed, 0, i, 0, 0);
    Freq_Meter_Init();

} }

如果你启用了Timer通道的捕获中断，并使用库提供中断服务函数，

当发生捕获中断后，在库的中断服务程序里会调用HAL_TIM_IC_CaptureCpltCallback。

而且该函数的具体内容由用户重写完成。