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Code compiled as Release behaves different than Debug code

Question asked by Krellmann.Martin on Dec 16, 2016
Latest reply on Dec 29, 2016 by Clive One

Hello experts.


Currently I experience a very strange problem with my firmware for a STM32F334.
I just switched from the debug configuration to release, uploaded the code to the device and it behaves totally different.

First of all being programmed with St-Link it does not start at all. If I program the device by the debug environment it starts, but does not work correct. To name it exactly, there is a timer for frequency measurement counting on an external clock. The data is collected by a DMA channel with a samling rate of 5 kHz. This fails at some point (not sure where) and a security mechanism is triggered.


I use a modified linker script and a modified startup file since I have initialized data in CCMRAM. Please find the files attached. Thus, I also use a different objcopy command to create the binary image for the flash memory:


arm-none-eabi-objcopy -R .data -R .ccmram -R .ccmidata -R .bss -O binary "${BuildArtifactFileBaseName}.elf" "${BuildArtifactFileBaseName}.bin"


The pehripheral initialization is the same for release or debug firmwares. I have the same optimization level for both as well. But, there are no debugging symbols in the release firmware. Because of this and because I do not expect different hardware timinigs with a connected debugger, there is probably something wrong with the linker script, the startup code or the objcopy command.


I'm not sure what information I can proivde in addition... Please ask if there is any.

My platform is Eclipse with SW4 and I do use the StdPeriph library and the arm-math library (but not in precompiled form).


Best regards,