STM32H743的高性能ADC采样与DMA实现详解

#include "main.h"



// ADC句柄定义

ADC_HandleTypeDef hadc1;

DMA_HandleTypeDef hdma_adc1;



// ADC采样数据缓冲区

#define ADC_BUFFER_SIZE 256

uint32_t adc_buffer[ADC_BUFFER_SIZE];



// 初始化ADC1

void MX_ADC1_Init(void) {

    ADC_ChannelConfTypeDef sConfig = {0};



    // 配置ADC1

    hadc1.Instance = ADC1;

    hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2;

    hadc1.Init.Resolution = ADC_RESOLUTION_12B;

    hadc1.Init.ScanConvMode = DISABLE;

    hadc1.Init.ContinuousConvMode = ENABLE;

    hadc1.Init.DiscontinuousConvMode = DISABLE;

    hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;

    hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;

    hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;

    hadc1.Init.NbrOfConversion = 1;

    hadc1.Init.DMAContinuousRequests = ENABLE;

    hadc1.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;



    if (HAL_ADC_Init(&hadc1) != HAL_OK) {

        Error_Handler();

    }



    // 配置ADC通道

    sConfig.Channel = ADC_CHANNEL_0;

    sConfig.Rank = ADC_REGULAR_RANK_1;

    sConfig.SamplingTime = ADC_SAMPLETIME_2CYCLES_5;



    if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) {

        Error_Handler();

    }

}



// DMA初始化

void MX_DMA_Init(void) {

    // 启用DMA时钟

    __HAL_RCC_DMA2_CLK_ENABLE();



    // 配置DMA

    hdma_adc1.Instance = DMA2_Stream0;

    hdma_adc1.Init.Channel = DMA_CHANNEL_0;

    hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;

    hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;

    hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;

    hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;

    hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;

    hdma_adc1.Init.Mode = DMA_CIRCULAR;

    hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH;

    hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;



    if (HAL_DMA_Init(&hdma_adc1) != HAL_OK) {

        Error_Handler();

    }



    // 将DMA与ADC绑定

    __HAL_LINKDMA(&hadc1, DMA_Handle, hdma_adc1);

}



// 主函数

int main(void) {

    HAL_Init();               // 初始化HAL库

    SystemClock_Config();     // 配置系统时钟

    MX_DMA_Init();            // 初始化DMA

    MX_ADC1_Init();           // 初始化ADC1



    // 启动ADC与DMA

    HAL_ADC_Start_DMA(&hadc1, adc_buffer, ADC_BUFFER_SIZE);



    while (1) {

        // 可在此处理采样数据

        uint32_t avg = 0;

        for (int i = 0; i < ADC_BUFFER_SIZE; i++) {

            avg += adc_buffer[i];

        }

        avg