Arduino for STM32

Hello,

did anybody set the stm32G4xx to internal Vref of 2.048, 2.5 or 2.9 V or other STM32 with internal reference which can be used?

Thanks in advance

never used the chip myself but presummably there is a register / bits that control the internal reference?

Yes, there are register(s) to set it, but if anybody made it before and got it running then it would be helpful.

ok, it was easier than i thought.

#define VREFBUF (*(volatile uint32_t *)(0x40010030)) // address of the VREF register

To use the internal Reverence:

Bit0 (ENVR) must be set to 1. That swithes to internal reference mode.
Bit1 (HIZ) must be set to 0. That connects the VREF+ pin internally with the vref buffer output. The reference voltage is now also at the VREF+ pin and can be used for other devices. In this mode the VREF+ pin must not connected to another voltage source.
Bit4 and 5 sets the reference voltage. 00= 2.048V, 01= 2.50V and 10= 2.90V.

in my case it is just 1 for 2.048V.
VREFBUF =1;
Now you should check Bit 3 (VRR) until it is set. Then the setup is finished.

https://www.st.com/resource/en/referenc ... ronics.pdf page 770+

You can use ll system API by including stm32yyxx_ll_system.h to manage the bits you mentioned:
https://github.com/stm32duino/Arduino_C ... 1158-L1254

with those values for voltage:
https://github.com/stm32duino/Arduino_C ... #L306-L308:

Thank you fpiSTM, that was what i am asking for but i did not found by myself.

I can use the system API ll run it useful. Thanks for the advice.