Nucleo G431KB enable OPAMP and COMP

[OmegaDryan]

Hi guys,

Can someone explain how to enable the opamp in the G4 board?

I found this wiki, and it looks like I need to create a file "variant.h" to enable the OPAMP peripheral. I really don't know where to start here. I know how to do it using CubeMX but I have never done it in Arduino.

https://github.com/stm32duino/wiki/wiki ... ion--150-1

I would like to do the same thing for the COMP peripheral.

Best,

Alessandro

[OmegaDryan]

I was able to make it work!

In the Arduino make a new tap (create a file named "hal_conf_extra.h") and paste the following code:

Code: Select all

#if !defined(HAL_OPAMP_MODULE_DISABLED)
  #define HAL_OPAMP_MODULE_ENABLED
#else
  #undef HAL_OPAMP_MODULE_ENABLED
#endif

The main Arduino code:

Code: Select all

OPAMP_HandleTypeDef hopamp2;

void setup() {
  // put your setup code here, to run once:


MX_OPAMP2_Init();
HAL_OPAMP_MspInit(&hopamp2);
HAL_OPAMP_Start(&hopamp2);
}

void loop() {
  // put your main code here, to run repeatedly:

}

static void MX_OPAMP2_Init(void)
{

  /* USER CODE BEGIN OPAMP2_Init 0 */

  /* USER CODE END OPAMP2_Init 0 */

  /* USER CODE BEGIN OPAMP2_Init 1 */

  /* USER CODE END OPAMP2_Init 1 */
  hopamp2.Instance = OPAMP2;
  hopamp2.Init.PowerMode = OPAMP_POWERMODE_NORMAL;
  hopamp2.Init.Mode = OPAMP_PGA_MODE;
  hopamp2.Init.NonInvertingInput = OPAMP_NONINVERTINGINPUT_IO0;
  hopamp2.Init.InternalOutput = DISABLE;
  hopamp2.Init.TimerControlledMuxmode = OPAMP_TIMERCONTROLLEDMUXMODE_DISABLE;
  hopamp2.Init.PgaConnect = OPAMP_PGA_CONNECT_INVERTINGINPUT_NO;
  hopamp2.Init.PgaGain = OPAMP_PGA_GAIN_4_OR_MINUS_3;
  hopamp2.Init.UserTrimming = OPAMP_TRIMMING_FACTORY;
  if (HAL_OPAMP_Init(&hopamp2) != HAL_OK)
  {
    //Error_Handler();
  }
}

void HAL_OPAMP_MspInit(OPAMP_HandleTypeDef* hopamp)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(hopamp->Instance==OPAMP2)
  {
  /* USER CODE BEGIN OPAMP2_MspInit 0 */

  /* USER CODE END OPAMP2_MspInit 0 */

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**OPAMP2 GPIO Configuration
    PA6     ------> OPAMP2_VOUT
    PA7     ------> OPAMP2_VINP
    */
    GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
  }

}

[fpiSTM]

Simply add a hal_conf_extra.h file with:

Code: Select all

#define HAL_OPAMP_MODULE_ENABLED

For ref:
https://github.com/stm32duino/wiki/wiki ... definition

[OmegaDryan]

Simply add a hal_conf_extra.h file with:

Code: Select all

#define HAL_OPAMP_MODULE_ENABLED

For ref:
https://github.com/stm32duino/wiki/wiki ... definition

That's only one step in the whole process.

I used CubeMX to generate the code for the main and the msp. Then copied it to Arduino with some small modification. Last but not least you need to start the peripheral otherwise nothing will work!

HAL_OPAMP_Start(&hopamp2);

Even CubeMX doesn't start the peripheral by default, so you need to add that command by yourself!

[fpiSTM]

I only comment on HAL OPAMP enable way. As there is no dedicated support for it you have to manage it by yourself like you've made