CubeMX and Vdd

MAI THANH.Brice · ‎2016-11-23

Posted on November 23, 2016 at 16:26

Hi

For some reason my µC is powered by 3V (instead of standard 3.3V)

On the file stm32f7xx_hal_conf.h we can find some define about the board.

One is ''VDD_VALUE'' and the value is 3300.

How can I change this default value ?

Thanks

MAI THANH.Brice · ‎2016-12-07

Posted on December 07, 2016 at 10:43

I find the solution. I don't know if this appears in the last update but you can choose the VDD value in the 'Configuration' tab then in RCC

View solution in original post

Andrei Chichak · ‎2016-11-23

Posted on November 23, 2016 at 21:46

This isn't the answer that you are looking for but, on my F4Discovery board I found exactly the same situation with Vdd being 3V.

There is a diode between the 3V3 for the debugger processor (generated by the 5V from the USB) and the 32F407 processor. This diode is dropping the 3V3 to 3V. On my board it is D3. I guess it is a blocking diode so that, if you power up the board through the bus pins, you will not back power the debugger section.

I brought up the voltage, so that I can run an ESP8266, by soldering a wire bridge across D3.

MAI THANH.Brice · ‎2016-12-07

Posted on December 07, 2016 at 10:43

I find the solution. I don't know if this appears in the last update but you can choose the VDD value in the 'Configuration' tab then in RCC