I have a STM32F427 micro controller with 2.5 V power supply. Some input signals are 3.3 V. Does it cause any damage on GPIO or can the STM32F427 tolerate 3.3 V logic?
The datasheet is here:
So if look for I/O pins in the table that have I/O structure "FT". These can tolerate inputs of up to 5V. (This appears to be most of the I/O pins.)
I learned this procedure from this Olimex forum post: https://www.olimex.com/forum/index.php?topic=1301.msg6060#msg6060