发一个STM32的MDA控制ADC采样程序

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sasmike 发布时间：2015-1-8 15:49

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本帖最后由 sasmike 于 2015-1-8 16:00 编辑

最近学习了STM32F0芯片，写了一个DMA控制ADC采样程序，给大家分享一下。还是新手，希望大家多提宝贵意见

程序在STM32F051上面测试的
基本内容是：
1、使用ADC1的11通道每1us采集一次ADC数值
2、使用DMA1的1通道对采集数据自动存储，共采集1000个数据
3、每次采集1000次数据后，在主函数中对1000次数据进行求平均值
4、由串口1发送到电脑串口上显示
具体程序如下：
#include "main.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define ADC_DR_Address                0x40012440
#define ADC_BUFFER_SIZE                1000
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
__IO uint16_t ADC_Buffer[ADC_BUFFER_SIZE];
__IO uint32_t ADC_ConvertedData_Sum;
__IO uint16_t ADC_ConvertedData;
__IO uint16_t ADC_ConvertedVoltage;
/* Private functions ---------------------------------------------------------*/
void Delay(__IO uint32_t nCount);

int main(void)
{

  __IO uint16_t index;

  USART1_GPIO_Init();

  printf("This is a ADC DMA Demo...\n");

  ADC_DMA_Config();

  /* Infinite loop */
  while (1)
  {
ADC_StartOfConversion(ADC1);

while ((DMA_GetFlagStatus(DMA1_FLAG_TC1)) == RESET)
{
}

ADC_StopOfConversion(ADC1);

DMA_ClearFlag(DMA1_FLAG_TC1);

ADC_ConvertedData_Sum = 0;
for (index = 0; index < ADC_BUFFER_SIZE; index ++)
{
   ADC_ConvertedData_Sum += ADC_Buffer[index];
}

ADC_ConvertedData = ADC_ConvertedData_Sum / ADC_BUFFER_SIZE;

ADC_ConvertedVoltage = (float)(ADC_ConvertedData * 2980) / 0xFFF + 0.5;
printf("------------------------------------\n");
printf("ADC_ConvertedData       = %d\n", ADC_ConvertedData);
printf("ADC_ConvertedVoltage    = %d\n", ADC_ConvertedVoltage);

  Delay(5000000);
  }
}
void ADC_DMA_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  ADC_InitTypeDef ADC_InitStructure;
  DMA_InitTypeDef DMA_InitStructure;

  ADC_DeInit(ADC1);

  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

  GPIO_DeInit(GPIOC);
  GPIO_StructInit(&GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  DMA_DeInit(DMA1_Channel1);
  DMA_StructInit(&DMA_InitStructure);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_Buffer;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = ADC_BUFFER_SIZE;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);

  DMA_Cmd(DMA1_Channel1, ENABLE);

  ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);

  ADC_DMACmd(ADC1, ENABLE);

  ADC_StructInit(&ADC_InitStructure);
  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
  ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
  ADC_Init(ADC1,&ADC_InitStructure);

  ADC_ChannelConfig(ADC1, ADC_Channel_11, ADC_SampleTime_239_5Cycles);
  ADC_GetCalibrationFactor(ADC1);

  ADC_Cmd(ADC1, ENABLE);

  while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN))
  {
  }
}
最后附上源程序：

STM32F0xx-ADC1000_DMA.rar (2.26 MB, 下载次数: 270)

赞收藏 2 评论22 发布时间：2015-1-8 15:49

22个回答

mengqiqq 回答时间：2015-1-8 22:15:02

非常好！！
楼主能否解释一下DMA配置的部分，刚学，总是整不好。
  DMA_DeInit(DMA1_Channel1);
  DMA_StructInit(&DMA_InitStructure);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_DR_Address;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_Buffer;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = ADC_BUFFER_SIZE;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);

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