HAL_DAC_Start_DMA stops on start calling HAL_DAC_ErrorCallbackCh1

[RPere.4]

if (HAL_DAC_Start(&hdac4, DAC_CHANNEL_1))
 {
 /* DAC conversion start error */
 Error_Handler();
 }
 
 if (HAL_OPAMP_Start(&hopamp4) != HAL_OK)
 {
 /* OPAMP start error */
 Error_Handler();
 }
 
 HAL_TIM_Base_Start(&htim7);
// while(1)
// 	 HAL_DAC_SetValue(&hdac4, DAC_CHANNEL_1, DAC_ALIGN_12B_R, Dacbuffers[0][0]);
 if (HAL_DAC_Start_DMA(&hdac4, DAC_CHANNEL_1,(uint32_t *) Dacbuffers[0], DAC_BUFFER_SIZE, DAC_ALIGN_12B_R) != HAL_OK)
 {
 /* DAC conversion start error */
 Error_Handler();
 }

Project is Cubemx generated. Everything works fine without DMA and i get result on DAC output. Trying to start DMA immediately stops with calling HAL_DAC_ErrorCallbackCh1. What can be the reason for this?

Cubemx generated code

DAC_HandleTypeDef hdac4;
DMA_HandleTypeDef hdma_dac4_ch1;
 
/* DAC4 init function */
void MX_DAC4_Init(void)
{
 DAC_ChannelConfTypeDef sConfig = {0};
 
 /** DAC Initialization 
 */
 hdac4.Instance = DAC4;
 if (HAL_DAC_Init(&hdac4) != HAL_OK)
 {
 Error_Handler();
 }
 /** DAC channel OUT1 config 
 */
 sConfig.DAC_HighFrequency = DAC_HIGH_FREQUENCY_INTERFACE_MODE_AUTOMATIC;
 sConfig.DAC_DMADoubleDataMode = DISABLE;
 sConfig.DAC_SignedFormat = DISABLE;
 sConfig.DAC_SampleAndHold = DAC_SAMPLEANDHOLD_DISABLE;
 sConfig.DAC_Trigger = DAC_TRIGGER_T7_TRGO;
 sConfig.DAC_Trigger2 = DAC_TRIGGER_NONE;
 sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_DISABLE;
 sConfig.DAC_ConnectOnChipPeripheral = DAC_CHIPCONNECT_ENABLE;
 sConfig.DAC_UserTrimming = DAC_TRIMMING_FACTORY;
 if (HAL_DAC_ConfigChannel(&hdac4, &sConfig, DAC_CHANNEL_1) != HAL_OK)
 {
 Error_Handler();
 }
 
}
 
void HAL_DAC_MspInit(DAC_HandleTypeDef* dacHandle)
{
 
 if(dacHandle->Instance==DAC4)
 {
 /* USER CODE BEGIN DAC4_MspInit 0 */
 
 /* USER CODE END DAC4_MspInit 0 */
 /* DAC4 clock enable */
 __HAL_RCC_DAC4_CLK_ENABLE();
 
 /* DAC4 DMA Init */
 /* DAC4_CH1 Init */
 hdma_dac4_ch1.Instance = DMA2_Channel1;
 hdma_dac4_ch1.Init.Request = DMA_REQUEST_DAC4_CHANNEL1;
 hdma_dac4_ch1.Init.Direction = DMA_MEMORY_TO_PERIPH;
 hdma_dac4_ch1.Init.PeriphInc = DMA_PINC_DISABLE;
 hdma_dac4_ch1.Init.MemInc = DMA_MINC_ENABLE;
 hdma_dac4_ch1.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
 hdma_dac4_ch1.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
 hdma_dac4_ch1.Init.Mode = DMA_CIRCULAR;
 hdma_dac4_ch1.Init.Priority = DMA_PRIORITY_VERY_HIGH;
 if (HAL_DMA_Init(&hdma_dac4_ch1) != HAL_OK)
 {
 Error_Handler();
 }
 
 __HAL_LINKDMA(dacHandle,DMA_Handle1,hdma_dac4_ch1);
 
 /* USER CODE BEGIN DAC4_MspInit 1 */
 
 /* USER CODE END DAC4_MspInit 1 */
 }
}

[Sirac]

Hi,

do you initialise DMA before ?

This is not righ => (uint32_t *) Dacbuffers[0]

Remplace by simply (uint32_t *) Dacbuffers, or at least (uint32_t *) &Dacbuffers[0]

[RPere.4]

Sorry to confuse you

Dacbuffers[2][DAC_BUFFER_SIZE] Supposed to be double buffer

What do you mean by initialization. Typically cubemex do this for you (second snippet)

[Sirac]

OK for Dacbuffers[2][DAC_BUFFER_SIZE]

Yes normally CubeMx generate for you a function call MX_DMA_Init() witch enable Irq and clk, but as I can't see this on your code I ask.

Do you configure the pin as analog.

You can try to you place breakpoint on DAC Irq and follow until HAL_DAC_ErrorCallbackCh1 to see what's going wrong.

[RPere.4]

Sure it is generated

void MX_DMA_Init(void) 
{
 
 /* DMA controller clock enable */
 __HAL_RCC_DMAMUX1_CLK_ENABLE();
 __HAL_RCC_DMA2_CLK_ENABLE();
 __HAL_RCC_DMA1_CLK_ENABLE();
 
 /* DMA interrupt init */
 /* DMA1_Channel1_IRQn interrupt configuration */
 NVIC_SetPriority(DMA1_Channel1_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),5, 0));
 NVIC_EnableIRQ(DMA1_Channel1_IRQn);
 /* DMA1_Channel2_IRQn interrupt configuration */
 NVIC_SetPriority(DMA1_Channel2_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),5, 0));
 NVIC_EnableIRQ(DMA1_Channel2_IRQn);
 /* DMA1_Channel3_IRQn interrupt configuration */
 NVIC_SetPriority(DMA1_Channel3_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),5, 0));
 NVIC_EnableIRQ(DMA1_Channel3_IRQn);
 /* DMA1_Channel4_IRQn interrupt configuration */
 NVIC_SetPriority(DMA1_Channel4_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),5, 0));
 NVIC_EnableIRQ(DMA1_Channel4_IRQn);
 /* DMA2_Channel1_IRQn interrupt configuration */
 HAL_NVIC_SetPriority(DMA2_Channel1_IRQn, 0, 0);
 HAL_NVIC_EnableIRQ(DMA2_Channel1_IRQn);
 
}

Pin is configured correctly. It is high speed DAC and output is through built-in op-amp as follower. See CUBEMX file attached.

And everything is working including DAC output without dma.

[B.Lunce]

I'm curious if you found and answer. I have pretty much the same problem. I notice the DMAUDRx bit gets set immediately after I turn on the timer associated with the DAC channel. Which means the data is triggered too fast. For my application it is way under 1Msps.