STM32G4 HAL does not support ADC_CHANNEL_0. Bug?

[unterberg_rtb]

We are using the ADC on an STM32G4xx for a safety project. The safety manual requires us to read VSS or VDD for ADC diagnostics. STM32G4 has ADC channel 0 internally connected to VSSA, so we are trying to use HAL_ADC_ConfigChannel() to configure ADC_CHANNEL_0.

Unfortunately, HAL_ADC_ConfigChannel() asserts on IS_ADC_CHANNEL(hadc, sConfig->Channel) because IS_ADC_CHANNEL() does not check for ADC_CHANNEL_0. I would assume this is a bug in stm32g4xx_hal_adc_ex.h since all ADC instances in the G4 do support VSS as valid input channel (see reference manual section 21.4.4).

Can someone please look at this?

Regards, Norbert

[Imen.D · Accepted solution]

Hello @unterberg_rtb ,

First let me welcome you to the STM32 Community :) and thank you for having reported this issue.

Indeed, this is a confirmed issue in HAL ADC driver: ADC_CHANNEL_0 is listed, so it must be checked by macro IS_ADC_CHANNEL().

To do: In this macro, and add "ADC_CHANNEL_0".

#define IS_ADC_CHANNEL(__HANDLE__, __CHANNEL__)  (      ( ((__CHANNEL__) == ADC_CHANNEL_1)                || \
                                                          ((__CHANNEL__) == ADC_CHANNEL_2)                || \
                     ...

An internal ticket ID 159520 is submitted for correction.
(PS: ID 159520 is an internal tracking number and is not accessible or usable by customers).

Thanks

Imen