I am attempting to modify the code in the STM32MP257f-ev1 GPIO_EXTI_CM33_NonSecure example to use LED2 vs LED3. The example runs correctly with the code provided, but simply changing LED3 to LED2, it does not run properly. The code compiles without error, yet LED2 does not illuminate when user button 2 is pressed.
Following the provided code and reference manual documentation, RM0457 Rev5 / pg.861, it appears all of the code is present in the example. To initialize LED2, VDDIO3 must be powered up to provide power for Port D I/Os. LED2 is on Port D.
During debug, the debugger does not stop at main, even though the Set breakpoint at main is checked in the Startup tab of my Debug configuration. This prevents me from stepping through the code to potentially identify what is going wrong. I have tried manually setting breakpoints and those seem to be disregarded as well. Skip all breakpoints is not enabled.
Furthermore, I do not know a way to verify whether VDDIO3 does in fact power up. Examining the PWR_CR1 SFR, it is not setting the bits necessary to enable or monitor VDDIO3. For future potential projects, I will likely need to power up other dormant VDDIOs.
Any suggestions are much appreciated.
