ADC_DMA_Transfer example on NUCLEO-U575ZI-Q board failure to go through

[hguan]

I am loading and running example "ADC_DMA_Transfer" on NUCLEO-U575ZI-Q board but failed go through on function call

MX_ADC4_Init();

Step into this function, the software trapped in the ADC calibration process.

if (HAL_ADCEx_Calibration_Start(&hadc4, ADC_CALIB_OFFSET, ADC_SINGLE_ENDED) != HAL_OK)

{

Error_Handler();

}

The software failed to start calibration and then tangled in Error_Handler() permanently.

I searched through the early post but didn't find right solution.

Any thought on this issue? Thanks.

[FBL]

Hello @hguan 

Could you check which kind of errors do you get from HAL? Is it linked to configuration/DMA error?

Could you share more details to reproduce the error?

Dump errors from registers view as well to make sure they are linked properly. 

[hguan]

Thank you for your quick response.

The dead loop happened during function call of HAL_ADCEx_Calibration_Start(...) within

stm32u5xx_hal_adc_ex.c.

Inside the HAL_ADCEx_Calibration_Start(...), it calls LL_ADC_IsCalibrationOnGoing(...)

/* Wait for calibration completion */

while (LL_ADC_IsCalibrationOnGoing(hadc->Instance) != 0UL)

{

wait_loop_index++;

if (wait_loop_index >= ADC_CALIBRATION_TIMEOUT)

{

/* Update ADC state machine to error */

ADC_STATE_CLR_SET(hadc->State, HAL_ADC_STATE_BUSY_INTERNAL, HAL_ADC_STATE_ERROR_INTERNAL);

__HAL_UNLOCK(hadc);

return HAL_ERROR;

}

}

The function LL_ADC_IsCalibrationOnGoing(...) always return non-zero value:

READ_BIT(ADCx->CR, ADC_CR_ADCAL) = 0x80000000

Once the timeout reaches ADC_CALIBRATION_TIMEOUT, it returns HAL_ERROR to the caller and then the software hungs up in the

Error_Handler().

The hardware board in my test is using STM32U575VIT6Q, not the evaluation board NUCLEO-U575ZI-Q.

[hguan · Accepted solution]

Hi, I found the issue, it is related to my hardware board. After I fixed the hardware (on power section) the ADC is working fine.

Appreciate your help.