STM32-ADC Introduction

1. Turn on the clocks of DMA and ADC1.

In RCC_Configuration(), add:

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

2. Configure analog IO input port

Configure in GPIO_Configuration()

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //ADC0 -light
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //ADC9-sound
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOB, &GPIO_InitStructure);

3. Configure DMA initialization and ADC initialization

void DMA_Configuration（void)

void ADC1_Configuration(void)

4. Start and read the ADC data

启动：ADC_SoftwareStartConvCmd(ADC1, ENABLE);

Wait for DMA processing completion flag: if (DMA_GetFlagStatus (DMA_FLAG_TC1) == 1)

deal with:

5. Selection of ADC hardware reference voltage:

void DMA_Configuration(void)
{
DMA_DeInit(DMA_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;       //Define DMA peripheral base
addressDMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue; //Define DMA memory base addressDMA_InitStructure.DMA_DIR
= DMA_DIR_PeripheralSRC;                //Peripheral as the source of data transmission (peripheral to memory) DMA_DIR_PeripheralDST——memory to peripheralDMA_InitStructure.DMA_BufferSize
= 3;                             //Continuously convert 3 AD channel valuesDMA_InitStructure.DMA_PeripheralInc
= DMA_PeripheralInc_Disable; //Peripheral register address remains
unchangedDMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;           //Memory register address increments
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word; //Peripheral data width 32bit
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;     //Memory data width 32bit
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;      //DMA mode is circular
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA priority
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;        //DMA is not set for memory to memory transfer
DMA_Init(DMA_Channel1, &DMA_InitStructure);

DMA_Cmd(DMA_Channel1, ENABLE);
}

void ADC1_Configuration(void)
{
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; // ADC1 ADC2 in independent mode
ADC_InitStructure.ADC_ScanConvMode = ENABLE; //ENABLE-ADC multi-channel scan, DISABLE-ADC single channel scan
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; // ENABLE--ADC continuous conversion mode DISABLE--ADC single conversion mode
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; // Triggered by software
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //Data aligned to the right
ADC_InitStructure.ADC_NbrOfChannel = 3; //Continuously convert 3 AD channel values
​​ADC_Init(ADC1, &ADC_InitStructure);

//Enable Vrefint channel17
ADC_TempSensorVrefintCmd(ENABLE); //channel17

   // ADC1 regular channel17 configuration
ADC_RegularChannelConfig(ADC1, ADC_Channel_17, 1, ADC_SampleTime_28Cycles5); //Vref
// ADC1 regular channel0 configuration
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 2, ADC_SampleTime_28Cycles5); //light
// ADC1 regular channel9 configuration
ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 3, ADC_SampleTime_28Cycles5); //sound

// ADC_RegularChannelConfig(ADC1, ADC_Channel_1,4, ADC_SampleTime_55Cycles5); //voltage

// Enable ADC1 DMA );
ADC_DMACmd(ADC1, ENABLE);

// Enable ADC1
ADC_Cmd(ADC1, ENABLE);

// Enable ADC1 reset calibaration register   
ADC_ResetCalibration(ADC1);
// Check the end of ADC1 reset calibration register
while(ADC_GetResetCalibrationStatus(ADC1));

// Start ADC1 calibaration
ADC_StartCalibration(ADC1);
// Check the end of ADC1 calibration
while(ADC_GetCalibrationStatus(ADC1));

  
}

void ADC_process_Voltage_Light_Voice(void)
{
ADC_Cmd(ADC1, ENABLE);
DMA_Cmd(DMA_Channel1, ENABLE);
   
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
// Delay(20);
    while(1)
{
      if(DMA_GetFlagStatus(DMA_FLAG_TC1)==1)
   {
        DMA_ClearFlag(DMA_FLAG_TC1); // Clear Channel 1 DMA_FLAG_TC flag
           break;
   }
   if((DMA_GetFlagStatus(DMA_FLAG_HT1)==1)||(DMA_GetFlagStatus(DMA_FLAG_TE1)==1))
   {
   DMA_ClearFlag(DMA_FLAG_HT1);
    DMA_ClearFlag(DMA_FLAG_TE1);
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
   }

}
   // voltage
    adv[0] = (float)1.2*4096/(ADC_ConvertedValue[0]&0x0fff); //放大50倍
   // light
adv[1] = (float)(ADC_ConvertedValue[1]&0x0fff)*1.2/(ADC_ConvertedValue[0]&0X0FFF); //放大100倍
    // sound
    adv[2] = (float)(ADC_ConvertedValue[2]&0x0fff)*1.2/(ADC_ConvertedValue[0]&0X0FFF); //放大100倍
      
    ADC_Cmd(ADC1, DISABLE);
DMA_Cmd(DMA_Channel1, DISABLE);
                                  
    Voltage = adv[0]*50;
    Light = adv[1]*100;      
    Voice = adv[2]*100;
}