配置如下:
void ADC_INTI(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
/* Enable peripheral clocks *************************************************/
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOB , ENABLE);
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_DMA2 , ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1 , ENABLE);
/* Configure ADC Channel 12 pin as analog input *****************************/
GPIO_InitStructure.GPIO_Pin = ADC12_IN8_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(ADC12_IN8_PORT, &GPIO_InitStructure);
/* DMA2 Stream0 channel0 configuration **************************************/
DMA_DeInit(DMA_CHANNELx);
DMA_InitStructure.DMA_Channel = DMA_CHANNELx;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&aADCTripleConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = 1;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA_STREAMx, &DMA_InitStructure);
/* DMA2_Stream0 enable */
DMA_Cmd(DMA_STREAMx, ENABLE);
/* ADC Common configuration *************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC1 regular channel 12 configuration ************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 1, ADC_SampleTime_3Cycles);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
// /* ADC2 regular channel 12 configuration ************************************/
// ADC_Init(ADC2, &ADC_InitStructure);
// /* ADC2 regular channel12 configuration */
// ADC_RegularChannelConfig(ADC2, ADC_Channel_8, 1, ADC_SampleTime_3Cycles);
// /* ADC3 regular channel 12 configuration ************************************/
// ADC_Init(ADC3, &ADC_InitStructure);
// /* ADC3 regular channel12 configuration */
// ADC_RegularChannelConfig(ADC3, ADC_Channel_8, 1, ADC_SampleTime_3Cycles);
/* Enable DMA request after last transfer (multi-ADC mode) ******************/
// ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
/* Enable ADC1 **************************************************************/
ADC_Cmd(ADC1, ENABLE);
}
我在后边调用aADCTripleConvertedValue的时候一直是一个值,但是ADC的数据寄存器内数值一直在变化,谁能告诉我怎么回事啊?
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