SX Compiler adding too much interrupt code.

DragonPIC · Joined: 11 Nov 2003 Posts: 118

I am working on a project that is very time critical to the cycle. I need to detect RTCC overflow, inc. a variable, and get out quick. I compiled my code and the CCS compiler for the SX chip adds in all this code to save all kinds of registers before executing the routine. I am guessing it is using these registers for holding misc. temp. data. I don't need it! Is there a way to keep it from creating this extra code?

Neutone · Joined: 08 Sep 2003 Posts: 839 Location: Houston

If you can manualy check the interupt flag more often than it can be set you can simply move the functionality from within your interupt to the main program area.

Darren Rook · Joined: 06 Sep 2003 Posts: 287 Location: Milwaukee, WI

Write your own interrupt service routine.

dyeatman · Joined: 06 Sep 2003 Posts: 1912 Location: Norman, OK

Use the CCS Global Interrupt call and create your own. Then you can do anything you like in C or assembler (I assume you would prefer assembler since it would only be a few instructions). Many of us have done this in time critical appilications.

Search for the topic number below I found doing a SEARCH on this web site:

144515295

I feel sure it will answer most of your questions.