STM32 ADC single conversion DMA read

 The DMA reading method is very suitable for high-frequency ADC sampling signals.

     The DMA reading method of ADC is actually similar to the interrupt reading method in the previous article, and the initialization code is even more similar. The initialization code is as follows:

static void ADC_GPIO_Config(void)

{

  GPIO_InitTypeDef  GPIO_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //ʹÄÜPB,PE¶Ë¿ÚʱÖÓ

GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN;

GPIO_Init(GPIOA, &GPIO_InitStructure);

}

static void ADC_Mode_Config(void)

{

  ADC_InitTypeDef ADC_InitStructure;

  DMA_InitTypeDef DMA_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);

DMA_DeInit(DMA1_Channel1);

DMA_InitStructure.DMA_PeripheralBaseAddr=(uint32_t)&ADC1->DR;

DMA_InitStructure.DMA_MemoryBaseAddr=(uint32_t)&adcconverdata;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize=1;

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;

DMA_InitStructure.DMA_PeripheralInc =DMA_PeripheralInc_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_Medium;

DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;

DMA_Init(DMA1_Channel1,&DMA_InitStructure);

DMA_Cmd(DMA1_Channel1,ENABLE);

ADC_DeInit(ADC1);

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

ADC_InitStructure.ADC_ScanConvMode=DISABLE;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfChannel=ADC_Channel_1;

ADC_Init(ADC1,&ADC_InitStructure);

RCC_ADCCLKConfig(RCC_PCLK2_Div8); 

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5);

ADC_DMACmd(ADC1,ENABLE);

  ADC_Cmd(ADC1,ENABLE);

ADC_ResetCalibration(ADC1);

while(ADC_GetResetCalibrationStatus(ADC1));

ADC_StartCalibration(ADC1);

while(ADC_GetCalibrationStatus(ADC1));

ADC_SoftwareStartConvCmd(ADC1,ENABLE);

}

void ADC_InitConfig(void)

{

  ADC_GPIO_Config();

  ADC_Mode_Config();

}

The code above is very clear. Although there are no annotations, I believe you can understand it. The code is very simple, so I won’t explain it.