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| From: | Anatoly Sokolov |
| Subject: | [avr-libc-dev] [patch #6352] Far pointer library |
| Date: | Wed, 02 Jan 2008 16:20:32 +0000 |
| User-agent: | Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; MRA 4.1 (build 00975); .NET CLR 1.0.3705; .NET CLR 1.1.4322; .NET CLR 2.0.50727) |
Follow-up Comment #1, patch #6352 (project avr-libc):
These functions modify RAMPZ register and is non-reenterable. They cannot
be used in interrupt handlers and pre-emptive Real Time OS. It should be
written in documentation.
Your comments on such offer:
Add in AVR GCC toolchain architectures for 128KB devices. Define
"__AVR_HAVE_RAMPZ__" macro and save RAMPZ register in interrupt handlers for
these devices.
Pro:
1. Safely use more 64KB data stored in FLASH.
2. Add xxxx_PF string functions in avr-libc.
3. In future add support of "far" pointer in avr-gcc.
Contra:
1. Longer prologue/epologue code in interrupt handlers (4 instructions + 1
byte stored in stack).
Anatoly.
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