Have you looked at the generated assembly code? (Add "-Wa,-ahlsd" to your compiler options to generate a list file). And have you considered other problems, such as watchdog resets causing problems for the slower code?
mvh., David Brian Neltner wrote:
Very oddly, the code runs when I compile it with -O3, but not with any other optimization level. ... Is this a known bug? On Fri, 2008-11-07 at 00:05 -0500, Brian Neltner wrote:Apologies if this has been mentioned before. I have some software that previously compiled perfectly on my computer, but which now fails silently when uploaded (no compile-time errors or warnings). I am hoping someone can help me! This works: int main(void) { uint8_t i; for(i=1;i<0xFF;i++) asm volatile("nop/n/t"); PORTA=0x01; while(1); } and PORTA is correctly set. However, this doesn't work: int main(void) { uint16_t i; for(i=1;i<0xFF;i++) asm volatile("nop/n/t"); PORTA=0x01; while(1); } and the code never reaches the PORTA setting command. I have included the following libraries: #include <avr/io.h> #include <avr/interrupt.h> #include <stdlib.h> #include <stdint.h> #include <stdbool.h> and this all worked previously, so I'm not sure what to do. This is using avr-gcc 4.3.0 Hopefully I am just missing a library which didn't used to be necessary but now is? It's very strange to me that my code is compiling without errors or warnings... but not running. Thanks, Brian
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