cancel
Showing results for 
Search instead for 
Did you mean: 

STM32MP15x USART/UART Default Pins

Otavio Borges
Associate III

Is stated on STM32MP157 datasheet's boot mode table that the MPU can be booted through UART:

– USART2/3/6 and UART4/5/7/8 on default pins

Nevertheless, I wasn't able to find which are the default pins for the UART interfaces, on the datasheet or reference manual. Where can I find those? STM32MP15-DISCO schematics uses UART4 pins PG11 and PB2 routed back to the Serial/USB bridge, are those UART4 by default?

 

GPIOx_AFRH/L reset value is 0 for all ports, and no UART pin is selected on AF0.

1 ACCEPTED SOLUTION

Accepted Solutions
4 REPLIES 4
MWoło.2
Senior II

Hi Otavio,

I think You should rather check in the reference manual on which GPIO ports STM32MP1 can be booted, the source doesn't matters.

Otavio Borges
Associate III

Hey @Michał Wołowik​ ,

Thanks, but didn't find mention of which GPIOs are usable on boot, on reference or datasheet. For some inputs is easy to assume, since there's only one pin option, e.g. FMC and USB.

But for UART/USART there are multiple mux possibilities, couldn't find on reference or datasheet where those are allocated on boot.

MWoło.2
Senior II

Missed that AN :)

Thanks @Michał Wołowik​ ​