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- Subject: Re: dsPIC33F Lua support (Was: Advocating Lua on an embedded systems fair)
- From: Doug Currie <doug.currie@...>
- Date: Mon, 9 Feb 2009 12:37:01 -0500
On Feb 9, 2009, at 12:02 PM, Bogdan Marinescu wrote:
on GCC, and GCC doesn't know about multiple memory spaces, you'll have
a problem with C "const" data on such systems, because it will be
simply copied to RAM (which is already tight) and accessed from there.
But there are some other compilers seem to know how to handle this
issue (don't know if one exists for the dsPIC though)/
The C30 compiler (based on gcc) from Microchip for dsPIC33 and PIC24H
knows to keep const data in flash. It can even avoid the "Harvard
blues" by mapping a big chunk (32 Kbytes) of data address space to
flash using a PSVPAG (Program Space Visibility) register. The compiler
will manage the PSVPAG register for you, or let you have control.
That said, I wouldn't necessarily advocate the dsPIC33 or PIC24H over
ARM or AVR processors for Lua.