ADC配合DMA如何正常工作

DanielWang

按照教程配置DMA和ADC后，发现DMA并不能正常工作（memoryValue值一直是0），希望各位前辈可以帮忙看看。

DMA配置如下：
        dmaInitValue.DMA_Channel = DMA_Channel_0;
        dmaInitValue.DMA_PeripheralBaseAddr = ADC1_BASE+0x4C;
        dmaInitValue.DMA_Memory0BaseAddr = (u16)&memoryValue;
        dmaInitValue.DMA_DIR = DMA_DIR_PeripheralToMemory;
        dmaInitValue.DMA_BufferSize = 1;
        dmaInitValue.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
        dmaInitValue.DMA_MemoryInc = DMA_MemoryInc_Disable;
        dmaInitValue.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
        dmaInitValue.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
        dmaInitValue.DMA_Mode = DMA_Mode_Circular;
        dmaInitValue.DMA_Priority = DMA_Priority_Medium;
        dmaInitValue.DMA_FIFOMode = DMA_FIFOMode_Disable;
        dmaInitValue.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
        dmaInitValue.DMA_MemoryBurst = DMA_MemoryBurst_Single; //?
        dmaInitValue.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//?
       
        DMA_Init(DMA2_Stream0, &dmaInitValue);
        DMA_Cmd(DMA2_Stream0, ENABLE);



ADC配置如下：
void adcCommInit(void){
        ADC_DeInit();
       
        commonInitType.ADC_Mode = ADC_Mode_Independent;
        commonInitType.ADC_Prescaler = ADC_Prescaler_Div4;
        commonInitType.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;//这里曾经试过模式2,没效果。现在改成这样后面单独使能ADC1的DMA
        commonInitType.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
       
        ADC_CommonInit(&commonInitType);
}

ADC_InitTypeDef adc1InitType;
void adc1Init(void){
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
       
        RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE);
        RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE);
       
        adc1InitType.ADC_Resolution = ADC_Resolution_12b;
        adc1InitType.ADC_ScanConvMode = DISABLE;
        adc1InitType.ADC_ContinuousConvMode = ENABLE;
        adc1InitType.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
        adc1InitType.ADC_DataAlign = ADC_DataAlign_Right;
        adc1InitType.ADC_NbrOfConversion = 1;
       
        ADC_Init(ADC1, &adc1InitType);
        ADC_Cmd(ADC1, ENABLE);
       
        ADC_DMACmd(ADC1, ENABLE);
        ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
}


void startAdc1(){
        ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_144Cycles);
        ADC_SoftwareStartConv(ADC1);
}

正点原子

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