Timer interrupts are not running on time.

Posted on March 24, 2014 at 01:09

Hello, I'm programing a VGA signal with the STM32 discovery board. I'm using a timer to generate sync pulses and everything seems to work fine since the image shows static in the monitor. But there are some glitches, the image is not static 100%  some rows are shifted to the right. I've tried every possible thing to fix this... and nothing worked.

POSSIBLE REASON:

(might not be the real reason)

I've discovered it's due to calling functions in my main program. It seems that if a function is called just before an interrupt then the interrupt is called some microseconds after, and this is why some rows are shifted to the right in my monitor. If I just run plain instructions in my main loop then this bug doesn't happen, but I need to call some functions in my main loop, so this is not a solution...

Is there any way to configure this processor to run interrupts right when they should run.

Thanks in advance.