2025-09-08 11:31 PM
Hi,
I would like to in-live upgrade firmware of STM32F407 through USART1, that means in-application program(IAP) . If I remember right, there need a trigger signal from key meanwhile NRST is low.
My question is that the Key signal could be connected to any GPIO I/O of STM32F407 except those dedicated pin, right? Is there special point to care about selection of Key I/O pin?
Thanks in advance!
Best regards!
Jason
Solved! Go to Solution.
2025-09-09 8:18 PM
Hi
very clear, get it!
Many thanks to all replier
Best regards!
Jason
2025-09-10 3:59 AM
@JieShen_Jason wrote:So, the pin for key could be any GPIO I/O
Doesn't even have to be a GPIO pin - you can use any event you like to trigger the upgrade process.
It could be a UART command (as illustrated by the menu in the AN4657 example) or anything else...