STM32F030 多通道ADC DMA采集

利用STM32F030C8T6的PA0和PA1引腳來進行兩通道ADC采集，通過DMA方式。直接上代碼。

1、ADC的GPIO引腳配置

void ADC_GPIO_Config(void)

{

    GPIO_InitTypeDef  GPIO_InitStructure;

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;    //模拟輸入

    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;    

    GPIO_Init(GPIOA, &GPIO_InitStructure);     

}

2、ADC對應的是DMA1的通道1：DMA1_Channel1

void DMA_Config(void)

{

    DMA_InitTypeDef   DMA_InitStructure;

    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

    DMA_DeInit(DMA1_Channel1);

    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;

    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RegularConvData_Tab;

    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

    DMA_InitStructure.DMA_BufferSize = 10;

    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;

    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;

    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_M2M = DMA_M2M_Disable;

    DMA_Init(DMA1_Channel1, &DMA_InitStructure);

    DMA_Cmd(DMA1_Channel1, ENABLE);

}

3、ADC初始化配置

void  ADC_Mode_Config(void)

{    

    ADC_InitTypeDef ADC_InitStructure;

    RCC_ADCCLKConfig(RCC_ADCCLK_PCLK_Div4);//配置ADC的時鐘頻率

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    ADC_StructInit(&ADC_InitStructure);

    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;    //12位模式

    ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;

    ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;    

    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;   

    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;    //右對齊    

    ADC_Init(ADC1, &ADC_InitStructure);//ADC初始化

    ADC_ChannelConfig(ADC1, ADC_Channel_0, ADC_SampleTime_239_5Cycles);     

    ADC_ChannelConfig(ADC1, ADC_Channel_1, ADC_SampleTime_239_5Cycles); 

    ADC_GetCalibrationFactor(ADC1);

    ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);

    ADC_DMACmd(ADC1,ENABLE);

    ADC_Cmd(ADC1,ENABLE);    //開啟AD轉換器    

    while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY)); 

    ADC_StartOfConversion(ADC1);

}