STM32 ADC和DMA

STM32 ADC和DMA简单总结

1.简介

使用野火开发板F429IGT6

ADC框图

ADC主要的选项配置有

• 时钟的分频配置，这个决定了ADC的时钟速度，
• 采样时钟数量，采样的时间长一点会更准，整个一个采样的周期是采样时间加上转换时间，如果使用12位的就需要加上12个时钟的转换时间，这样3个采样时间加上12个转换时间，整个采样周期就是15个周期
• 数据对齐的方式为左对齐还是右对齐，因为数据寄存器的宽度是16位的，采样的精度只能12位
• 扫描模式是同一个ADC开启多个通道，是否要轮流转换每个通道
• 连续采样是ADC是否要一直采样转换还是触发一次就停止转换
• EOC是转换结束标志
• 可以配置ADC的触发是软件触发还是硬件触发
• rank可以配置各个通道的转换先后顺序
• ADC可以分为规则转换通道和注入转换通道，一般用的就是规则转换通道

ADC还可以配置为多重采样的模式，一共有3个ADC，可以轮流来采样转换同一个通道，这样在第一个ADC转换的时候第二个可以紧接着采样，可以提升ADC的采样率。

将3个ADC的相同通道选中，在ADC1的模式中选择三重采样。配置DMA以ADC1为主，其他ADC不需要配置，每个ADC都要打开循环检测模式。

DMA的配置主要有

• 数据传输的方向，分为存储器到存储器，外设到存储器，存储器到外设
• 传输的模式是循环传输还是只传输一次
• 传输数据的宽度
• 传输时外设寄存器的地址和存储器的地址要不要递增，注意每次递增的地址的大小是和设置的数据宽度相同的

如果使用FIFO的话可以设置突发模式等

2.代码

使用cubemx6.6.0

MDK5.34

2.1多通道DMA

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    adc.c
  * @brief   This file provides code for the configuration
  *          of the ADC instances.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2022 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "adc.h"

/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;

/* ADC1 init function */
void MX_ADC1_Init(void)
{
   
   

  /* USER CODE BEGIN ADC1_Init 0 */

  /* USER CODE END ADC1_Init 0 */

  ADC_ChannelConfTypeDef sConfig = {
   
   0};

  /* USER CODE BEGIN ADC1_Init 1 */

  /* USER CODE END ADC1_Init 1 */

  /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
  */
  hadc1.Instance = ADC1;
  hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
  hadc1.Init.Resolution = ADC_RESOLUTION_12B;
  hadc1.Init.ScanConvMode = ENABLE;
  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 = 3;
  hadc1.Init.DMAContinuousRequests = ENABLE;
  hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
  if (HAL_ADC_Init(&hadc1) != HAL_OK)
  {
   
   
    Error_Handler();
  }

  /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
  */
  sConfig.Channel = ADC_CHANNEL_13;
  sConfig.Rank = 1;
  sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
   
   
    Error_Handler();
  }

  /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
  */
  sConfig.Channel = ADC_CHANNEL_4;
  sConfig.Rank = 2;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
   
   
    Error_Handler();
  }

  /** Configure for the selected ADC regular channel its corresponding rank in the sequencer and its sample time.
  */
  sConfig.Channel = ADC_CHANNEL_6;
  sConfig.Rank = 3;
  if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
  {
   
   
    Error_Handler();
  }
  /* USER CODE BEGIN ADC1_Init 2 */
  /* USER CODE END ADC1_Init 2 */

}

void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{
   
   

  GPIO_InitTypeDef GPIO_InitStruct = {
   
   0};
  if(adcHandle->Instance==ADC1)
  {
   
   
  /* USER CODE BEGIN ADC1_MspInit 0 */

  /* USER CODE END ADC1_MspInit 0 */
    /* ADC1 clock enable */
    __HAL_RCC_ADC1_CLK_ENABLE();

    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**ADC1 GPIO Configuration
    PC3     ------> ADC1_IN13
    PA4     ------> ADC1_IN4
    PA6     ------> ADC1_IN6
    */
    GPIO_InitStruct.Pin = GPIO_PIN_3;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* ADC1 DMA Init */
    /* ADC1 Init */
    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_HALFWORD;
    hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
    hdma_adc1.Init.Mode = DMA_CIRCULAR;
    hdma_adc1.Init.Priority = DMA_PRIORITY_LOW;
    hdma_adc1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
    if (HAL_DMA_Init(&hdma_adc1) != HAL_OK)
    {
   
   
      Error_Handler();
    }

    __HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc1);

  /* USER CODE BEGIN ADC1_MspInit 1 */
	
  /* USER CODE END ADC1_MspInit 1 */
  }
}

void HAL_ADC_MspDeInit(ADC_HandleTypeDef* adcHandle)
{
   
   

  if(adcHandle->Instance==ADC1)
  {
   
   
  /* USER CODE BEGIN ADC1_MspDeInit 0 */

  /* USER CODE END ADC1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_ADC1_CLK_DISABLE();

    /**ADC1 GPIO Configuration
    PC3     ------> ADC1_IN13
    PA4     ------> ADC1_IN4
    PA6     ------> ADC1_IN6
    */
    HAL_GPIO_DeInit(GPIOC, GPIO_PIN_3);

    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_4|GPIO_PIN_6);

    /* ADC1 DMA DeInit */
    HAL_DMA_DeInit(adcHandle->DMA_Handle);
  /* USER CODE BEGIN ADC1_MspDeInit 1 */

  /* USER CODE END ADC1_MspDeInit 1 */