Issue to use PC13 as output on RTC wakeup timer

hello all,

I want to write a code to test the possibility to use PC13 as output to activate a regulator when the micro is in Vbat mode.. I'm using a STM32F476.

in the manual, in Vbat mode, RTC_OUT still available for Alarm ou wakeup output.

so, in cube Mx I configure RTC in wakeup mode Routed to out. it active PC13 Pin.

I also enable NVIC interrupt.

I use a callback with a toogle on another GPIO to try my code, and it work with this IO.

I enter in the callback every 10sec but nothing append on PC13.

it seem that pc13, RTC and HAL lib have issue together.

if anyone can help me on this please.

I also try to use the PC13 as simple GPIO and it doesnt work until I change some RTC register manualy...