STM32F373多路ADC DMA采集问题

天涯水乡 · 发表于 2014-7-9 16:26:31

以下如代码，采集四路ADC，但现在第二路上电总会有1V左右电压，再添加几路同样莫名的有电压，不知道为什么。有人知道吗？
#include "adc.h"
__IO uint16_t ADCConvertedValue[4]={0};
#define ADC1_DR_Address ((uint32_t)0x4001244C)

void ADC_Config(void)
{
ADC_InitTypeDef     ADC_InitStructure;
GPIO_InitTypeDef    GPIO_InitStructure;
DMA_InitTypeDef     DMA_InitStructure;

/* ADCCLK = PCLK2/4 */
//RCC_ADCCLKConfig(RCC_PCLK2_Div4);
RCC_ADCCLKConfig(RCC_PCLK2_Div6);
/* GPIOB Periph clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

/* Configure ADC Channel9 as analog input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_4|GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);

/* DMA1 clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);

/* DMA1 Channel1 Config */
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADCConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 4;
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);
/* DMA1 Channel1 enable */
DMA_Cmd(DMA1_Channel1, ENABLE);

/* ADC1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

/* ADC1 DeInit */
ADC_DeInit(ADC1);

/* Enable ADC_DMA */
ADC_DMACmd(ADC1, ENABLE);

/* Initialize ADC structure */
ADC_StructInit(&ADC_InitStructure);

/* Configure the ADC1 in continuous mode */
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 4;
ADC_Init(ADC1, &ADC_InitStructure);

/* Convert the ADC1 Channel 9 with 55.5 Cycles as sampling time */
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_239Cycles5);

/* Convert the ADC1 temperature sensor with 55.5 Cycles as sampling time */
ADC_RegularChannelConfig(ADC1, ADC_Channel_1 ,2, ADC_SampleTime_239Cycles5);

/* Convert the ADC1 Vref with 55.5 Cycles as sampling time */
ADC_RegularChannelConfig(ADC1, ADC_Channel_4 , 3, ADC_SampleTime_239Cycles5);

/* Convert the ADC1 Vbat with 239.5 Cycles as sampling time */
ADC_RegularChannelConfig(ADC1, ADC_Channel_5 ,4, ADC_SampleTime_239Cycles5);

/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);

/* ADC1 reset calibration register */
ADC_ResetCalibration(ADC1);

while(ADC_GetResetCalibrationStatus(ADC1));

/* ADC1 calibration start */
ADC_StartCalibration(ADC1);

while(ADC_GetCalibrationStatus(ADC1));

/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
}