Interrupt Levels - Saving registers ??

Andreas · Joined: 25 Oct 2004 Posts: 136

Hi All,

After searching the forum I couldnt find a sample of how and which registers I should save when using fast interrupts

Can somebody give me some hints or smaples of how dealing with this ?

best regards
Andreas

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

future · Joined: 14 May 2004 Posts: 330

Fast interrupts must be coded in a way that no external registers are changed or save/restore everything you change.

Code something then watch the generated asm.

In the other thread, I was having problems with the scratch register 3. I did not see that it was being changed.

Andreas · Joined: 25 Oct 2004 Posts: 136

Thank You PCM Programmer,

No I didnt See this topic.

For me I think the search function is not very efficient, when searching for interrupt fast I get hundreds of threads.

Thanks for pointing me there, I will try to understand it now. Also the linkjs within this thread have been very helpful

best regards
Andreas