DUAL MODE DAC OF STM32 F0

[Stark]

I want to create 2 analog output (DAC) on PA4 & PA5 pin. How to make DAC dual mode as instructed in refmanual? When I use template code and add 1 more DAC channel but no success.please help me how to make 2 DACs simultaneously.

Thanks

static void DAC_Ch1_EscalatorConfig(void)    // DAC channel 1
{
  /*##-1- Initialize the DAC peripheral ######################################*/
  if (HAL_DAC_Init(&DacHandle) != HAL_OK)
  {
    /* Initiliazation Error */
    Error_Handler();
  }
 
  /*##-1- DAC channel1 Configuration #########################################*/
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
 
  if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DACx_CHANNEL) != HAL_OK)
  {
    /* Channel configuration Error */
    Error_Handler();
  }
    
 
  /*##-2- Enable DAC Channel1 and associeted DMA #############################*/
    //sine_val
    //if (HAL_DAC_Start_DMA(&DacHandle, DACx_CHANNEL, (uint32_t *)aEscalator8bit, 6, DAC_ALIGN_8B_R) != HAL_OK)
  if (HAL_DAC_Start_DMA(&DacHandle, DACx_CHANNEL, (uint32_t *)Wave_LUT8_36, 4608, DAC_ALIGN_8B_R) != HAL_OK)
  {
    /* Start DMA Error */
    Error_Handler();
  }
}
static void DAC_Ch2_EscalatorConfig(void)       //dac channel 2
{
  /*##-1- Initialize the DAC peripheral ######################################*/
  if (HAL_DAC_Init(&DacHandle) != HAL_OK)
  {
    /* Initiliazation Error */
    Error_Handler();
  }
 
  /*##-1- DAC channel1 Configuration #########################################*/
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
 
  if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DAC_CHANNEL_2) != HAL_OK)
  {
    /* Channel configuration Error */
    Error_Handler();
  }
    
 
  /*##-2- Enable DAC Channel1 and associeted DMA #############################*/
    //sine_val
    //if (HAL_DAC_Start_DMA(&DacHandle, DACx_CHANNEL, (uint32_t *)aEscalator8bit, 6, DAC_ALIGN_8B_R) != HAL_OK)
  if (HAL_DAC_Start_DMA(&DacHandle, DAC_CHANNEL_2, (uint32_t *)Wave_LUT8_36, 4608, DAC_ALIGN_8B_R) != HAL_OK)
  {
    /* Start DMA Error */
    Error_Handler();
  }
}

[RomainR. · Accepted solution]

Hello @danh.1 (Community Member)

I have inspected your code stm32f0xx_hal_msp.c and in the function HAL_DAC_MspInit():

I notice that all the code of the PA5 configuration and which corresponds to the DAC Channel 2 is commented on lines 72 to 75 ? PA5 is not well configured for DAC output.

This is also the case for your DMA, you have configured a single channel DMA1_CHANNEL3 for DAC Channel 1 (PA4) and that is linked to hdma_dac1.

You also need a second DMA1_CHANNEL4 for DAC Channel 2 (PA5) for an hdma_dac2 which you should declare and initialize.

Thank you to tag my answer as best.

Best regards,

Romain,