STM32F407ZGT6ADC通过DMA传输数据的初始化

ID:668759 · 发表于 2019-12-19 22:04

ADC通过DMA传输数据的初始化，F407ZGT6板子可用

#include "stm32f4xx.h"
#include "adc.h"
#include "math.h"

#define ADC_BUF_SIZE 20
__IO u16 aADCConvertedValue[ADC_BUF_SIZE];

//êy×é?a???3

//PA0-[0]
//3?ê??ˉADC
void _Adc_Init()
{

      ADC_CommonInitTypeDef ADC_CommonInitStructure ;
      ADC_InitTypeDef    ADC_InitStructure;

      DMA_InitTypeDef    DMA_InitStructure;

      DMA_DeInit(DMA2_Stream0);

      while (DMA_GetCmdStatus(DMA2_Stream0) != DISABLE)
      {
      }


      DMA_InitStructure.DMA_Channel = DMA_Channel_0;
      DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&ADC1->DR;
      DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)aADCConvertedValue;
      DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
      DMA_InitStructure.DMA_BufferSize = ADC_BUF_SIZE;
      DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
      DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
      DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
      DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
      DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
      DMA_InitStructure.DMA_Priority = DMA_Priority_High;
      DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
      DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
      DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
      DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
      DMA_Init(DMA2_Stream0, &DMA_InitStructure);
      DMA_Cmd(DMA2_Stream0, ENABLE);

      RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE);
      RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE);

      ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
      ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
      ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
      ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
      ADC_CommonInit(&ADC_CommonInitStructure);

      ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
      ADC_InitStructure.ADC_ScanConvMode = DISABLE;
      ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
      ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;

      ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
      ADC_InitStructure.ADC_NbrOfConversion = 1;
      ADC_Init(ADC1, &ADC_InitStructure);


      ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_15Cycles);







      ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);


      ADC_DMACmd(ADC1, ENABLE);

      ADC_Cmd(ADC1, ENABLE);


      ADC_SoftwareStartConv(ADC1);
}


void Adc_Init()
{
      GPIO_InitTypeDef  GPIO_InitStructure;
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);




      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
      GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
      GPIO_Init(GPIOA, &GPIO_InitStructure);


      _Adc_Init();

}

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