STM32F303K8 DAC problem

[Rad Rad]

Posted on July 14, 2017 at 13:38The original post was too long to process during our migration. Please click on the attachment to read the original post.

[waclawek.jan]

Posted on July 17, 2017 at 12:44

And are the GPIO set properly? If you toggle the respective bits in GPIO_ODR, does the output level change?

JW

[Zt Liu]

Posted on July 19, 2017 at 03:47

hi, using my F303K8 nucleo 32 board,

I just test the code of your init and 

HAL_DAC_SetValue() and

 HAL_DAC_Start();

It works fine for both DACx and for three channels.

You may check in your stm32f3xx_hal_msp.c, is there any code looks like:

void HAL_DAC_MspInit(DAC_HandleTypeDef* hdac)

{

   GPIO_InitTypeDef GPIO_InitStruct;

    if(hdac->Instance==DAC1)

   {       

      /* Peripheral clock enable */

      __HAL_RCC_DAC1_CLK_ENABLE();

      /**DAC1 GPIO Configuration

      PA4 ------> DAC1_OUT1

      PA5 ------> DAC1_OUT2

      */

      GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5;

      GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;

      GPIO_InitStruct.Pull = GPIO_NOPULL;

      HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);   

   }

   else if(hdac->Instance==DAC2)

   {

      /* Peripheral clock enable */

      __HAL_RCC_DAC2_CLK_ENABLE();

      /**DAC2 GPIO Configuration

      PA6 ------> DAC2_OUT1

      */

      GPIO_InitStruct.Pin = GPIO_PIN_6;

      GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;

      GPIO_InitStruct.Pull = GPIO_NOPULL;

      HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

   }

}

It seems that, sometime, if you rework on you ioc projects, this msp part is not written or left blank.(not sure about this)

Good luck!

[Rad Rad]

Posted on August 22, 2017 at 11:43

Yes, mine stm32f3xx_hal_msp.c includes these code lines.

[Rad Rad]

Posted on August 22, 2017 at 12:02

yes, output stages are changing respectively, I can drive LED2 & LED3, some other pins also checked and works. DAC control register also seems to be set correctly (to my knowledge), from STM Studio it returns a value of  4128829 = DAC2: 00 00000000111111  DAC1: 00 00000000111101.