Keil Compiler: USB examples do not work in Opt level 0

flyer31 · ‎2012-03-29

Posted on March 29, 2012 at 19:59

Hi,

I have some nicely working USB device examples now, but none of them works, if I use the Keil compiler (uVision 4.23) with opt level 0 - for opt level 1-3 they work nicely.

Has anyone observed something similar already? Any hint, what the reason could be?

Tesla DeLorean · ‎2012-03-29

Posted on March 29, 2012 at 21:01

Perhaps you could check stack utilization, and if data buffers get pushed into different regions of memory (with different DMA access speeds/limitations, or alignments).

See if you can bisect the problem by optimizing different portions of the code.

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