Non-working firmware when product_state is changed to "closed" - STM32H523CET6

[jwoj088]

Hello,

I have a problem with the operation of my firmware in "closed" state of PRODUCT_STATE. When my device is in "open" mode (ED code) my firmware works perfectly fine, but when i do provisioning procedure and change state to closed (72 code), my firmware works for a second and then hangs. In that state i cannot attach a debbuger to see what going on, so I have no idea why it doesn't work. My device has trust zone disabled, it is a custom PCB with STM32H523CET6.

Thanks in advance for any help.

[Jocelyn RICARD]

Hello @jwoj088 ,

one possible reason could be that you usage of DWT (Data Watchpoint and Trace Unit) to get the clock cycle counter.

This feature is disabled when you go in CLOSED state.

I can't see any other reason for such behaviour

Best regards

Jocelyn

 

[jwoj088]

Hello Jocelyn, 

I removed the use of DWT in my code and now the "closed" state works correctly. 

Thank you for your help.