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Program does not run with optimization disabled, except if debugging

Enzo Redivo

Hello.

I've been having issues with a program of mine that works perfectly fine while running with optimizations enabled but if I disable it, it doesn't seem to get to main, the only exception being running in debug mode.  I have set up the pins using MCUXpresso Config Tools v7, and did not modify any of the generated code except for changing the #pragma push and #pragma pop for #pragma clang diagnostic push and #pragma clang diagnostic pop in the MK22FA12.h header file generated by Keil, as the ARM6 compiler seems not to accept the former.

I have also changed the first line in the scatter file for #!armclang -E --target=arm-arm-none-eabi -mcpu=cortex-m4 -xc (was #! armcc -E) and disabled the "Use Memory Layout from Target Dialog" option in the Linker.


Using debug mode every optimization setting seems to work fine.

Compiler: ARM V6.13.1

Board: MK22FX512AVLL12

SDK: MCUXpresso 2

IDE: Keil uVision5

I've included a simple project that makes one of the leds blink when it gets to main that reproduces the presented problem. I have tested with all optimization levels and the only one that does not work when I run is -O0*.

*It does run, in debug mode only.

If anyone could help me, I'd be really glad.

Blink.zip

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