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[avr-gcc-list] On the subject of lean ISR's
From: |
Dennis Clark |
Subject: |
[avr-gcc-list] On the subject of lean ISR's |
Date: |
Wed, 25 Feb 2009 10:23:29 -0700 (MST) |
User-agent: |
SquirrelMail/1.4.13 |
Rather than hijack a thread I'll start my own.
How does everyone lean out an ISR? I too have been appalled at the
preamble/postamble code GCC puts into the ISR.
I always put ISR variables in global space to avoid stack issues, but the
heap access registers still need push/popped. I tried using register
variables to avoid heap access and found that there is no way to know if a
library call is using that register - The compiler does NOT guarantee
exclusive access. Can you actually get away with a "NAKID" attribute on
the ISR?
How have others dealt with ISR bloat reduction?
Many thanks,
DLC
--
Dennis Clark
TTT Enterprises
- [avr-gcc-list] On the subject of lean ISR's,
Dennis Clark <=