Hello,
I have a program where I have several strings. To avoid the use of RAM, I'm using the PROGMEM to have array of strings, and also the F() to store strings on the flash (PGM).
I'm using a arduino mega2560, and I see if changes some strings to the flash, with F(), I start having problems with the encoding and decondig.
I have arrived to the point where I have a program with 83346 bytes (32% of program space). And all is working.
If I change the line:
_lcd->print("1) ");
to
_lcd->print(F("1) "));
The program size jumps to 83598 bytes, and the encode and decode doesn't work correctly.
I have made several changes on the code, but always I get a program above the 83346 I get problems on the AES library. All the rest is working.
I see that the library also uses PGM to store values.
My question, is there the possibility that the use of several strings stored on the PGM, could cause problem on the library?
I'm using AES CBC 128bits.
Thanks for any idea that can be shared.