STM32H743 LSE pins as GPIO - not working

[uprogc]

Hi,

I'm trying to use one from the following pins: PC 13,14,15, PI8, but not working. The code is CubeMX generated. clock for PORTC is enabled, no LSEON, no alternate function. I tried in OUTPUT_PP mode with pullup and without pullup. I think the PC14,15 is floating. ( I use I2S on PORTC, but that is working. ) Any solution for this ? Regards.

[uprogc]

Anyone ?

[uprogc]

I must change my 6L PCB design thanks to this problem !

[Uwe Bonnes]

Start the program in a debugger and break into the program. Check the PORTC register settings against the reference manual. Keep in mind that PC13-15 has only limited source capability.

[uprogc]

"Start the program in a debugger" - The PORTC settings are OK.

"Keep in mind that PC13-15 has" - I know. These pins are used in output mode for driving a logic CMOS IC.

[waclawek.jan]

Also read the GPIOs controlled by the RTC subchapter of RTC chapter in RM, read out and check the RTC registers.

Also check LSEON by reading it back.

JW

[uprogc]

"Also check LSEON by reading it back." -- Done, No LSEON.

[waclawek.jan]

And the RTC registers?

And the GPIOC registers?

JW