Re: dsPIC33F Lua support (Was: Advocating Lua on an embedded systems fair)

[Doug Currie <doug.currie@...>]

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.

e