STM32f3 ADC & DMA Problem

[alexander239955_stm1_stmicro_c]

Posted on October 04, 2015 at 15:30

Hey,

i am trying hard to get the DMA & ADC controller to work on my discovery board. I want to sample PA1&2, which are connected to current shunts.the following code is not working, and i am not sure why. the DMA_IT_TC is called once. i start the conversion in the TIM1_CC4 withDMA_SetCurrDataCounter(DMA1_Channel1, 2);DMA_Cmd(DMA1_Channel1, ENABLE);ADC_StartConversion(ADC1);this is my init_code:uint16_t ADCBuffer[] = {1,1};void ADC_DMA_Config(void){  RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div2);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 ;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;  GPIO_Init(GPIOA, &GPIO_InitStructure);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 ;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;  GPIO_Init(GPIOA, &GPIO_InitStructure);  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;  ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode;  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;  ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_OneShot;  ADC_CommonInitStructure.ADC_TwoSamplingDelay = 10;  ADC_CommonInit(ADC1, &ADC_CommonInitStructure);  ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable;  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;  ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0;  ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None;  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;  ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable;  ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable;  ADC_InitStructure.ADC_NbrOfRegChannel = 2;  ADC_Init(ADC1, &ADC_InitStructure);  /* ADC1 regular channel7 configuration */  ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_7Cycles5);  ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 2, ADC_SampleTime_7Cycles5);  DMA_StructInit(&DMA_InitStructure);  DMA_InitStructure.DMA_PeripheralBaseAddr  = (uint32_t)&(ADC1->DR);  DMA_InitStructure.DMA_MemoryBaseAddr  = (uint32_t)&ADCBuffer;  DMA_InitStructure.DMA_DIR  = DMA_DIR_PeripheralSRC;  DMA_InitStructure.DMA_BufferSize  = 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_Normal;  DMA_InitStructure.DMA_Priority  = DMA_Priority_Medium;  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  DMA_Init(DMA1_Channel1, &DMA_InitStructure);  DMA_ClearITPendingBit(DMA1_IT_TC1);  DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  NVIC_Init(&NVIC_InitStructure);  /* Enable ADC1 */  ADC_DMAConfig( ADC1, ADC_DMAMode_OneShot);  ADC_DMACmd(ADC1, ENABLE);  ADC_Cmd(ADC1, ENABLE); }

[Tesla DeLorean]

Posted on October 04, 2015 at 15:35

the DMA_IT_TC is called once

That would suggest you'd need to reset the DMA controller more effectively, or use it in Circular mode so it reconfigures itself each time around.

[alexander239955_stm1_stmicro_c]

Posted on October 04, 2015 at 16:38

Hey Clive,

thank you for your input. i changed to code. the DMA interrupt is called every time, but the values of the ADCBuffer are wrong or not changed.uint16_t ADCBuffer[] = {1,1};void ADC_DMA_Config(void){  RCC_ADCCLKConfig(RCC_ADC12PLLCLK_Div8);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_ADC12, ENABLE);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 ;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;  GPIO_Init(GPIOA, &GPIO_InitStructure);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 ;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;  GPIO_Init(GPIOA, &GPIO_InitStructure);  ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;  ADC_CommonInitStructure.ADC_Clock = ADC_Clock_AsynClkMode;  ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;  ADC_CommonInitStructure.ADC_DMAMode = ADC_DMAMode_Circular;  ADC_CommonInitStructure.ADC_TwoSamplingDelay = 16;  ADC_CommonInit(ADC1, &ADC_CommonInitStructure);  ADC_InitStructure.ADC_ContinuousConvMode = ADC_ContinuousConvMode_Disable;  ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;  ADC_InitStructure.ADC_ExternalTrigConvEvent = ADC_ExternalTrigConvEvent_0;  ADC_InitStructure.ADC_ExternalTrigEventEdge = ADC_ExternalTrigEventEdge_None;  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;  ADC_InitStructure.ADC_OverrunMode = ADC_OverrunMode_Disable;  ADC_InitStructure.ADC_AutoInjMode = ADC_AutoInjec_Disable;  ADC_InitStructure.ADC_NbrOfRegChannel = 2;  ADC_Init(ADC1, &ADC_InitStructure);  /* ADC1 regular channel7 configuration */  ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_7Cycles5);  ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 2, ADC_SampleTime_7Cycles5);  DMA_StructInit(&DMA_InitStructure);  DMA_InitStructure.DMA_PeripheralBaseAddr  = (uint32_t)&(ADC1->DR);  DMA_InitStructure.DMA_MemoryBaseAddr  = (uint32_t)&ADCBuffer;  DMA_InitStructure.DMA_DIR  = DMA_DIR_PeripheralSRC;  DMA_InitStructure.DMA_BufferSize  = 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_Medium;  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  DMA_Init(DMA1_Channel1, &DMA_InitStructure);  DMA_ClearITPendingBit(DMA1_IT_TC1);  DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  NVIC_Init(&NVIC_InitStructure);  ADC_DMAConfig( ADC1, ADC_DMAMode_Circular);  ADC_DMACmd(ADC1, ENABLE);  ADC_Cmd(ADC1, ENABLE); }

[G S]

Posted on November 17, 2017 at 19:47

I have the same exact issue, was this ever resolved?