STM32 + ADC Dual regular simultaneous mode and DMA : need to call HAL_DMA_Init

[Professional]

Hello,

i want to use 3 ADC :

-ADC1 et ADC2 in Dual regular simultaneous mode + trigger on timer +DMA

-ADC3 on its own in continuous mode + DMA.

According to reference manuel,for DMA :

-ADC1 can use channel0 + stream0

-ADC2 can use channel1 + stream2

-ADC3 can use channel2 + stream1

Is it mandatory to program explicitely the DMA ? (cubemx doesn't call  HAL_DMA_Init function)

Do i need to do the following initialization :

g_DmaHandleADC1.Instance = DMA2_Stream0;

 g_DmaHandleADC1.Init.Channel = DMA_CHANNEL_0;

 g_DmaHandleADC1.Init.Direction = DMA_PERIPH_TO_MEMORY;

 g_DmaHandleADC1.Init.PeriphInc = DMA_PINC_DISABLE;

 g_DmaHandleADC1.Init.MemInc = DMA_MINC_ENABLE;

 g_DmaHandleADC1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;

 g_DmaHandleADC1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;

 g_DmaHandleADC1.Init.Mode = DMA_NORMAL; //DMA_CIRCULAR;

 g_DmaHandleADC1.Init.Priority = DMA_PRIORITY_HIGH;

 g_DmaHandleADC1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

 g_DmaHandleADC1.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_HALFFULL;

 g_DmaHandleADC1.Init.MemBurst = DMA_MBURST_SINGLE;

 g_DmaHandleADC1.Init.PeriphBurst = DMA_PBURST_SINGLE;

 HAL_DMA_Init(&g_DmaHandleADC1);

 __HAL_LINKDMA(&hadc1, DMA_Handle, g_DmaHandleADC1);

 g_DmaHandleADC2.Instance = DMA2_Stream0;

 g_DmaHandleADC2.Init.Channel = DMA_CHANNEL_2;

 g_DmaHandleADC2.Init.Direction = DMA_PERIPH_TO_MEMORY;

 g_DmaHandleADC2.Init.PeriphInc = DMA_PINC_DISABLE;

 g_DmaHandleADC2.Init.MemInc = DMA_MINC_ENABLE;

 g_DmaHandleADC2.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;

 g_DmaHandleADC2.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;

 g_DmaHandleADC2.Init.Mode =DMA_NORMAL; //DMA_CIRCULAR;

 g_DmaHandleADC2.Init.Priority = DMA_PRIORITY_HIGH;

 g_DmaHandleADC2.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

 g_DmaHandleADC2.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_HALFFULL;

 g_DmaHandleADC2.Init.MemBurst = DMA_MBURST_SINGLE;

 g_DmaHandleADC2.Init.PeriphBurst = DMA_PBURST_SINGLE;

 HAL_DMA_Init(&g_DmaHandleADC2);

 __HAL_LINKDMA(&hadc2, DMA_Handle, g_DmaHandleADC2);

 g_DmaHandleADC3.Instance = DMA2_Stream0;

 g_DmaHandleADC3.Init.Channel = DMA_CHANNEL_1;

 g_DmaHandleADC3.Init.Direction = DMA_PERIPH_TO_MEMORY;

 g_DmaHandleADC3.Init.PeriphInc = DMA_PINC_DISABLE;

 g_DmaHandleADC3.Init.MemInc = DMA_MINC_ENABLE;

 g_DmaHandleADC3.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;

 g_DmaHandleADC3.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;

 g_DmaHandleADC3.Init.Mode = DMA_NORMAL; //DMA_CIRCULAR;

 g_DmaHandleADC3.Init.Priority = DMA_PRIORITY_HIGH;

 g_DmaHandleADC3.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

 g_DmaHandleADC3.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_HALFFULL;

 g_DmaHandleADC3.Init.MemBurst = DMA_MBURST_SINGLE;

 g_DmaHandleADC3.Init.PeriphBurst = DMA_PBURST_SINGLE;

 HAL_DMA_Init(&g_DmaHandleADC3);

 __HAL_LINKDMA(&hadc3, DMA_Handle, g_DmaHandleADC3);

best regards

thanks

[Amel NASRI]

Hi @Professional​ ,

You need to configure DMA in STM32CubeMX, then the initialization code for DMA will be added.

You need to check both main.c file as well as the generated stm32xxxx_hal_msp.c file.

-Amel

[Professional]

Hello

thank you very much for your reply : i was just looking at main.c

I have programmed ADC1 + ADC2 in Dual regular simultaneous mode and continuous mode, and i validated DMA2 stream0 and stream2 global interrupt in CubeMX

1) If i call the  HAL_ADC_Start_DMA (&hadc1, (uint32_t *) &aADCxConvertedData[0], ADC_CONVERTED_DATA_BUFFER_SIZE );

will it start the ADC1 and ADC2 in continuous mode (has just handle for ADC1 is given) ?

2) in the function void DMA2_Stream0_IRQHandler() can i get the data from ADC1 conversion (in aADCxConvertedData array)

3) in the function void DMA2_Stream2_IRQHandler() can i get the data from ADC2 conversion : where are they placed in my aADCxConvertedData array ?

thanks

regards