Posted on September 23, 2013 at 08:42I�ve have a problem with the ADCs in dual regular simultaneous mode.
I want to measure 3 channels with ADC1 and 3 channels with ADC2. The conversions are started by software. I want to get 32 acquisitions in DMA mode and then stop the ADCs. The conversions will be started by software again.
My code works fine but after several acquisitions I get sometimes wrong results for ADC2.
// init DMA and ADC
DMA_DeInit(DMA1_Channel1); // ADC and DMA handling
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_DualConvertedValueTab;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = (32*3);
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);
DMA_Cmd(DMA1_Channel1, ENABLE);
// ADC1 configuration
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;
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 = 3;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 1, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_12, 2, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 3, ADC_SampleTime_41Cycles5);
ADC_DMACmd(ADC1, ENABLE);
// ADC2 configuration
ADC_InitStructure.ADC_Mode = ADC_Mode_RegSimult;
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 = 3;
ADC_Init(ADC2, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC2, ADC_Channel_7, 1, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC2, ADC_Channel_6, 2, ADC_SampleTime_41Cycles5);
ADC_RegularChannelConfig(ADC2, ADC_Channel_13, 3, ADC_SampleTime_41Cycles5);
ADC_ExternalTrigConvCmd(ADC2, ENABLE);
// calibrate ADC1
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
// calibrate ADC2
ADC_Cmd(ADC2, ENABLE);
ADC_ResetCalibration(ADC2);
while(ADC_GetResetCalibrationStatus(ADC2));
ADC_StartCalibration(ADC2);
while(ADC_GetCalibrationStatus(ADC2));
__disable_interrupt();
// DMA1 interrupt
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
__enable_interrupt();
}
void ADC_Start(void)
{
DMA_Cmd(DMA1_Channel1, ENABLE);
ADC_Cmd(ADC1, ENABLE);
ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}
// DMA Mode
void DMA_ADC1_2_IRQHandler(void)
{
DMA_Cmd(DMA1_Channel1, DISABLE); // ADC and DMA handling
DMA_ClearFlag(DMA1_FLAG_TC1);
ADC_Cmd(ADC1, DISABLE);
}
#provide-complete-code #adc-dma-dualmode
