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Re: [avr-gcc-list] program memory access question

From: Marek Michalkiewicz
Subject: Re: [avr-gcc-list] program memory access question
Date: Wed, 12 Jun 2002 11:05:38 +0200 (CEST)

> Can I do what I'm trying to do without reverting to calls to _lpm_inline?

Well, besides lpm you have a few string functions (with *_P names)
that work on strings in program memory.  You can use memcpy_P() to
copy something from program memory to RAM - you can have a big array
of structs in program memory, and copy just one element, for example.

> Is there something obvious that I'm missing?

GCC itself doesn't handle different address spaces (extending it to do
that would be quite a lot of work, useful only for a few targets -
AVR, some DSP chips, x86 segments...), so we have to live with special
macros and library functions to access anything in program memory.

Not perfect, but not that hard in practice...


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