我是通过DMA来获得ADC数据的，贴上我的代码，请大家看看有什么问题
int main (void)
{
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
ADC_Configuration();//在这个位置ADC可以工作正常
OSInit();
OSTaskCreate(AppTaskStart,(void *)0,(OS_STK *)&AppTaskStartStk[128-1],16);
OSStart();
}
void AppTaskStart (void *pdata)
{
BSP_Init();
NVIC_Configuration();
//ADC_Configuration();//放到这里ADC无法工作
GPIO_Config();
OSStatInit();
USBD_Init(&USB_OTG_dev,USB_OTG_FS_CORE_ID,&USR_desc, &USBD_CDC_cb, &USR_cb);
CAN_Config();
while(1)
{
AppTaskCreate();
OSTaskSuspend(OS_PRIO_SELF);
OSTimeDly(4);
}
}
void ADC_Configuration(void)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;
/* Enable ADC3, DMA2 and GPIO clocks ****************************************/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* DMA2 Stream0 channel2 configuration **************************************/
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&AD_Value;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = 64;
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_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream0, ENABLE);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC3 Init ****************************************************************/
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 4;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC3 regular channel6 configuration *************************************/
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 1, ADC_SampleTime_144Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 2, ADC_SampleTime_144Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 3, ADC_SampleTime_144Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 4, ADC_SampleTime_144Cycles);
/* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
/* Enable ADC3 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC3 */
ADC_Cmd(ADC1, ENABLE);
ADC_SoftwareStartConv(ADC1);
} |
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