NUCLEO-H743ZI2 TIM17 problem

[vhsabino]

Description

Hello, we are trying to instance TIM17 to use it as PWMout, however it crashes the code. We removed everything from the code, except this pin (PB_9 or PF_7) and the code crashes instantly.
Thanks in advance.

Issue request type

[ ] Question
[ ] Enhancement
[x] Bug

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOCUSTRIA-1697

[LMESTM]

@vhsabino - would be great to share the sample code and the console logs when reporting such a problem.

You're not supposed to explicitly select a given Timer instance in MBED. If using PB_9, the default Timer instance that will be selected is TIM4, See pin map table here:
https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H743xI/TARGET_NUCLEO_H743ZI2/PeripheralPins.c#L206

In case you want to use TIM17, you have the possibility to use PB9_ALT0 pin. Which is the same pin with an alternative ALT configuration than the default one. See here:
https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H743xI/TARGET_NUCLEO_H743ZI2/PeripheralPins.c#L207

Hope this helps

[0xc0170]

@vhsabino As noted above, without description how to reproduce, we can't much help.

[vhsabino]

Thank you for your fast answer!

We are aware of the pin map table and we tried PB9_ALT0 as well before coming here.

Here is the simplest code I can provide you.

#include <mbed.h>
Serial pc(USBTX, USBRX, 115200);
PwmOut LED(PF_7);
int main() {
// It does not print anything with the PWM at the PF_7, if I change the interface to DigitalOut it prints.
pc.printf("Hello World!\n");
LED.write(0.5);
}

I appreciate your help!

[LMESTM]

Ok thanks - that is clearer now.
We may be missing a few lines with TIM17 indeed then, like here:
https://github.com/ARMmbed/mbed-os/blob/master/targets/TARGET_STM/TARGET_STM32H7/pwmout_device.c#L73

@jeromecoutant

[jeromecoutant]

Please review #12295