本帖最后由 busdriver 于 2013-5-12 22:17 编辑
发现只有第一个ADC通道比较准，后面的转换结果不准。请帮忙。
比如ADC_Channel_0对应DMA的RegularConvData_Tab[0]，结果准确，后面从RegularConvData_Tab[1]就不准确。注释掉ADC_Channel_0，让ADC_Channel_1对应DMA的RegularConvData_Tab[0]，结果神奇准确，后面从RegularConvData_Tab[1]依然不准确。
不知道说清楚没有，下面是程序代码。
#define ADC1_DR_Address 0x40012440
__IO uint16_t RegularConvData_Tab[5];
//__IO uint16_t RegularConvData_Tab[6];
uint32_t vdd_12v, vdd_5v5,vdd_3v3;
void ADC1_DMA_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
/* ADC1 DeInit */
ADC_DeInit(ADC1);
/* GPIOC Periph clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
/* ADC1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* DMA1 clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);
/* Configure ADC Channel11 as analog input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0| GPIO_Pin_1 |GPIO_Pin_1 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* DMA1 Channel1 Config */
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RegularConvData_Tab;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 5;
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);
/* ADC DMA request in circular mode */
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);
/* Enable ADC_DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Initialize ADC structure */
ADC_StructInit(&ADC_InitStructure);
/* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits */
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward;
ADC_Init(ADC1, &ADC_InitStructure);
/* Convert the ADC1 Channel 1 with 55.5 Cycles as sampling time */
//ADC_ChannelConfig(ADC1, ADC_Channel_0 , ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig (ADC1, ADC_Channel_1 , ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig (ADC1, ADC_Channel_2, ADC_SampleTime_55_5Cycles);
/* Convert the ADC1 temperature sensor with 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_TempSensor , ADC_SampleTime_55_5Cycles);
ADC_TempSensorCmd(ENABLE);
/* Convert the ADC1 Vref with 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_Vrefint , ADC_SampleTime_55_5Cycles);
ADC_VrefintCmd(ENABLE);
/* Convert the ADC1 Vbat with 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_Vbat , ADC_SampleTime_55_5Cycles);
//ADC_VbatCmd(ENABLE);
/* ADC Calibration */
ADC_GetCalibrationFactor(ADC1);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Wait the ADCEN falg */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));
//ADC_DMACmd(ADC1, ENABLE);
/* ADC1 regular Software Start Conv */
ADC_StartOfConversion(ADC1);
//ADC_DMACmd(ADC1, ENABLE);
}
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已经折腾好几天了，求帮助
