Question
Problem with ADCs in dual regular mode
Posted on September 23, 2013 at 08:42
I�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