STM32F070 ADC 多通道DMA方式数据错位
使用STM32F070进行ADC多通道数据采集，DMA的方式，配置如下，但出现DMA数据错位情况void ADCInit(void){
ADC_InitTypeDef ADC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
/* ADC1 DeInit */
ADC_DeInit(ADC1);
/* ADC1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* 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)AD_Value;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 4*2;
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 temperature sensorwith 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_11 , ADC_SampleTime_55_5Cycles);
/* Convert the ADC1 Vrefwith 55.5 Cycles as sampling time */
ADC_ChannelConfig(ADC1, ADC_Channel_13 , ADC_SampleTime_55_5Cycles);
/* ADC Calibration */
ADC_GetCalibrationFactor(ADC1);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Wait the ADCEN falg */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADEN));
/* ADC1 regular Software Start Conv */
ADC_StartOfConversion(ADC1);
}
程序GPIO部分在初始化ADC之前已经初始化了
使用DMA进行数据传送，目标地址为AD_Value;本意是每通道采集4此后求平均的
理论上AD_Value,AD_Value,AD_Value,AD_Value,应该是通道11的数据；
AD_Value,AD_Value,AD_Value,AD_Value,应该是通道13的数据，但是实际上数据对调了
求大神指点，谢谢！
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Backward;
把上面这句的参数改为ADC_ScanDirection_Upward 用这个配置采集的顺序ADC_RegularChannelConfig(ADC1,ADC_Channel_11,1,ADC_SampleTime_55Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_13, 2, ADC_SampleTime_55Cycles5); 詹科联手走天下吗 发表于 2017-12-7 08:39
用这个配置采集的顺序ADC_RegularChannelConfig(ADC1,ADC_Channel_11,1,ADC_SampleTime_55Cycles5); ADC_ ...
谢谢回复，在STM32F0XX系列中是没有这样指定顺序的函数的 应该先初始化DMA后才初始化ADC。
页:
[1]