B-U585I-IOT02A: No ADC1 data from PC0 pin

Hello all!

I need some rubber ducking help here.

I have got hold of a B-U585I-IOT02A dev board, where I'm trying to get learn and get to know the STM32 family.

I have got a lot of things working, but the ADC1 is giving me a hard time:

Here is my MX config:

IN1 enabled, and expecting the data to be stored in the DR register.

PC0 is selected as ADC1_IN1:

Global interrupts are enabled:

So far, so good( I think ).

my application code:

/* Running in my main while(1) loop */
 // Other stuff before here
 if (StartConv) {
 if (HAL_ADC_Start_IT(&hadc1) != HAL_OK)
 {
 /* Start Conversation Error */
 Error_Handler();
 }
 StartConv = 0;
 }
 HAL_Delay(10);

And when above is executed, I can see that I'm getting a interrupt and call to my own ConversionCallback function:

void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* AdcHandle)
{
 /* Get the converted value of regular channel */
 adc_raw = HAL_ADC_GetValue(AdcHandle);
 printf("ADC Raw Value: %lu\r\n", adc_raw);
 // Retrigger convertion
 StartConv = 1;
}

 (Remember folks, this is just for learning, I would never but a printf call in my ISR ;) )

And the prints i'm getting:

Fluctuating values between 0 and 2:

"But hey, have he even applied any voltage on the PC0 pin?" you might be thinking.

And the answer is: Yes, I have tried to direct hot wire the 3.3V pin from connector CN17.

I have also tried to use a potentiometer(This is my standard setup):

When I measure the PC0 pin (Green cable in my setup), I can see that it is between 0 and 3.3V based on the potentiometer position.

I base the board pins on the documentation:

So, so far during my rubber ducking session I have not found the problem!

Can someone else see my probably n00b mistake?