PROGMEM about chipkit32-max HOT 6 CLOSED

From Mark Sproul:

const

works the same as PROGMEM.

from chipkit32-max.

He's verifying that.

from chipkit32-max.

Sorry, he checked and it's not the equivalent.

from chipkit32-max.

The solution is around const, but we need to understand better what is happening under the hood...

with and without const the errors I get are different (different sections of memory)

I also found that using const_cast is a way to cast correctly between variables with const and regular variables

from chipkit32-max.

Under closer checking, const does indeed put data into the flash memory space. Definitions for all of the prog_char etc data types have been added to the wiring.h file. <avr/pgmspace.h> is not needed, besides its avr only
The proper way to do this in a program that is going to use memory is

#if defined(AVR)
#include <avr/pgmspace.h>
#endif

this way if the program gets used under avr, the prog_char defs are present. They are automatically included for pic32

Mark

from chipkit32-max.

Some guideline should be written about using const, as accessing libraries that are not expecting const variables can result in a compilation error. cost_cast must be used.

from chipkit32-max.