STM32F4 DAC not working

Posted on January 28, 2017 at 23:40

hi,

   I am trying to use discovery board DAC module to adjust my external led's brightness by giving different level out voltage.

   I am sure that led is working on 3V, GPIOA.PA5 port also is working.

   But when I run the following my DAC module, the led has no light at all. Any ideas?

  void main()

  {

    uint32_t Ret;

    HAL_Init();

    __HAL_RCC_GPIOA_CLK_ENABLE();

    GPIO_InitTypeDef GPIOInitDef;

    GPIOInitDef.Pin = GPIO_PIN_4;

    GPIOInitDef.Mode = GPIO_MODE_ANALOG;

    GPIOInitDef.Pull = GPIO_NOPULL;

    GPIOInitDef.Speed = GPIO_SPEED_FREQ_LOW;

    HAL_GPIO_Init(GPIOA, &GPIOInitDef);

    DAC_HandleTypeDef DACHandleTypeStruct;

    DACHandleTypeStruct.Instance = DAC;

    Ret = HAL_DAC_Init(&DACHandleTypeStruct);

    DAC_ChannelConfTypeDef DACChannelConfStruct;

    DACChannelConfStruct.DAC_Trigger = DAC_TRIGGER_NONE;

    DACChannelConfStruct.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;

    Ret = HAL_DAC_ConfigChannel(&DACHandleTypeStruct,&DACChannelConfStruct, DAC_CHANNEL_1);

    Ret = HAL_DAC_Start(&DACHandleTypeStruct, DAC_CHANNEL_1);

    HAL_DAC_SetValue(&DACHandleTypeStruct, DAC_CHANNEL_1, DAC_ALIGN_12B_R, 0x0FFF);

    while(1)

    {

      ;

    }

}

#dac