ADC2 calibration

[LKoe]

Hi,

I have a problem with the ADC2 calibration on STM32H743VIT6(V). I use ADC1 and ADC2 in dual mode(Regular simultaneous mode). On some boards the ADC2 calibartion doesn't work. (The ADCAL-Bit in ADC_CR is not cleard after start).

On the boards where I have the problem with the ADC2 calibration, when I change the dual mode to simultaneous mode + Regular simultaneous mode the calibration of ADC2 works.

I don't unstertand this bevaior. 

What is the problem of ADC2 calibration on some controllers in Regular simultaneous mode.

[Pierre_Paris]

Hello @LKoe ,

Thank you for your question.

Q: "What is the problem of ADC2 calibration on some controllers in Regular simultaneous mode."

A: ADC1 (master) and ADC2 (slave) must not be used by the application and must wait calibration is complete. You must try first with HAL API.

 /* Run the ADC calibration in single-ended mode */
  if (HAL_ADCEx_Calibration_Start(&AdcHandle_master, ADC_CALIB_OFFSET_LINEARITY, ADC_SINGLE_ENDED) != HAL_OK)
  {
    /* Calibration Error */
    Error_Handler();
  }

  if (HAL_ADCEx_Calibration_Start(&AdcHandle_slave, ADC_CALIB_OFFSET_LINEARITY, ADC_SINGLE_ENDED) != HAL_OK)
  {
    /* Calibration Error */
    Error_Handler();
  }

 Then you can follow the Software procedure to calibrate the ADC at the page 925 of the Reference manual.

Best Regards,

Pierre