大家帮忙看看我的dma传输

只看该作者 · 2015-11-26 10:42

我用STM32F401的adc1采样一个通道数据，然后通过dma传输到存储器，但是程序一直显示adc溢出，并且dma无动作，我查看dma的寄存器，显示都是0，似乎配置都没有写进寄存器，不知道哪里的问题，请大神帮忙看下，小弟不胜感激

#define ADC1_DR_Address  ((uint32_t)0X4001204C)

void DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStruct;

RCC_AHB1PeriphResetCmd(RCC_AHB1Periph_DMA2,ENABLE);

DMA_DeInit(DMA2_Stream0);
DMA_InitStruct.DMA_BufferSize=10;
DMA_InitStruct.DMA_Channel=DMA_Channel_0;
DMA_InitStruct.DMA_DIR=DMA_DIR_PeripheralToMemory;
DMA_InitStruct.DMA_FIFOMode=DMA_FIFOMode_Disable;
DMA_InitStruct.DMA_FIFOThreshold=DMA_FIFOThreshold_HalfFull;
DMA_InitStruct.DMA_Memory0BaseAddr=(uint32_t)&adc_buff[0];
DMA_InitStruct.DMA_MemoryBurst=DMA_MemoryBurst_Single;
DMA_InitStruct.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord;
DMA_InitStruct.DMA_MemoryInc=DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_Mode=DMA_Mode_Circular;
DMA_InitStruct.DMA_PeripheralBaseAddr=/*(uint32_t)(ADC1_BASE+0x4C);*/ADC1_DR_Address;
DMA_InitStruct.DMA_PeripheralBurst=DMA_PeripheralBurst_Single;
DMA_InitStruct.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord;
DMA_InitStruct.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_Priority=DMA_Priority_High;

DMA_Init(DMA2_Stream0,&DMA_InitStruct);
DMA_Cmd(DMA2_Stream0,ENABLE);
}
void adc_init(void)
{
GPIO_InitTypeDef GPIO_SET;             //GPIO config
ADC_InitTypeDef ADC_InitStruct;
ADC_CommonInitTypeDef ADC_CommonInitStruct;

GPIO_SET.GPIO_Mode=GPIO_Mode_AN;       //Analog mode
GPIO_SET.GPIO_Speed=GPIO_Speed_100MHz; //Max speed is 50M
GPIO_SET.GPIO_OType=GPIO_OType_OD;    //Open drain output
GPIO_SET.GPIO_PuPd=GPIO_PuPd_NOPULL;    //Pull no
GPIO_SET.GPIO_Pin=GPIO_Pin_1;
GPIO_Init(GPIOA, &GPIO_SET);          //Init GPIO

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);

ADC_DeInit();

ADC_CommonInitStruct.ADC_DMAAccessMode=ADC_DMAAccessMode_1;
ADC_CommonInitStruct.ADC_Mode=ADC_Mode_Independent;
ADC_CommonInitStruct.ADC_Prescaler=ADC_Prescaler_Div2;
ADC_CommonInitStruct.ADC_TwoSamplingDelay=ADC_TwoSamplingDelay_5Cycles;

ADC_CommonInit(&ADC_CommonInitStruct);

ADC_InitStruct.ADC_ContinuousConvMode=ENABLE;
ADC_InitStruct.ADC_DataAlign=ADC_DataAlign_Right;
ADC_InitStruct.ADC_ExternalTrigConv=ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_ExternalTrigConvEdge=ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_NbrOfConversion=1;
ADC_InitStruct.ADC_Resolution=ADC_Resolution_12b;
ADC_InitStruct.ADC_ScanConvMode=ENABLE;

ADC_Init(ADC1,&ADC_InitStruct);

ADC_RegularChannelConfig(ADC1,ADC_Channel_1,1,ADC_SampleTime_15Cycles);

   ADC_DMARequestAfterLastTransferCmd(ADC1,DISABLE);
ADC_DMACmd(ADC1,ENABLE);

ADC_Cmd(ADC1,ENABLE);

DMA_Config();
adc_delay(20000);
ADC_SoftwareStartConv(ADC1);

}

只看该作者 · 2015-11-26 10:44

自己帮忙顶下，adc本来应该连续采样的，可是只能采样一个数据，然后就溢出停到那了，各路大神帮帮忙

只看该作者 · 2015-11-26 15:46

DMA上面的那句时钟使能写错了，写成了复位，改过之后DMA寄存器正确了，可是还是不能传输，并且ADC依然只采样一次就显示溢出。