Function HAL_PWREx_EnableVddUSB() for STM32C0 series MCU

[PPate.1]

Hi,

I am implementing USB CDC ACM on my custom board using STM32C071x series of microcontroller. It is currently not working and looking at other post on community I observed that one of the problem is of missing call to function - HAL_PWREx_EnableVddUSB(). is this function call necessary for all series of STM32 microcontrollers?

If that is the case then it is missing in my auto generated code from CubeMX. I also tried manually adding it but it is giving me compilation error - 'undefined reference to `HAL_PWREx_EnableVddUSB'

Thanks,

Pradeep

[AScha.3 · Accepted solution]

Hi,

so for the ..PWREx... look in the HAL driver, what functions are there - for your chip !

Maybe it has other name or this chip dont have it at all...

here, you can see, whats in the driver:

+

To know, whether USB is "ON" , look in debug at the "SFR" , then registers for USB , and see, what is there .

So you can find out, whats wrong; just read in rm, what should be in registers / their meaning.