On Nov 20, 2010, at 1:35 PM, Peter Bigot wrote:
> You could probably avoid the assembler file with a simple:
>
> uint8_t USBMEM[2048] asm("0x1c00");
I have a couple more (possibly dumb?) questions about this:
First, how does emitting a constant value with the asm() directive result in
assigning the specified address as the variable's location? It's not clear to
me how this actually functions, given the documentation I've seen for the asm()
directive so far at http://mspgcc.sourceforge.net/manual/c1308.html
Second, is there a means to use a preprocessor symbol to specify the address in
one of these directives? Some of the location pragmas in the code that I'm
porting use hex constants, while others use preprocessor symbols that are
pulled from one of the header files. I'd prefer to avoid needing to hard-code
the corresponding addresses in the C code file(s) if possible. It appears that
I need to enclose the arguments to the asm() directives in quotes, but that
keeps the preprocessor symbols from being evaluated.
--
Mark J. Blair, NF6X <[email protected]>
Web page: http://www.nf6x.net/
GnuPG public key available from my web page.
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