Hi Johny,
Thanks for the insight. I have moved all consts to pgm memory and accessed them with macros, so able to liberate a few hundred bytes of RAM I also noticed that all my const array of structs are being stored in RAM. Is there any way to force const them into program memory Yes, but that might not be what you really want. Since the Iris uses an AVR chip, you have a Harvard memory architecture. This means that the program space and RAM space are separate, so to access constants you need specific code to read from program space rather than plain RAM (using the instruction "LPM"). The header file <avr/pgmspace.h> defines the macro PROGMEM which instructs the compiler to place a const entity in program memory, as well as some macros for easier reading from program space (e.g. pgm_read_byte_near/far). If you're storing string constants in program space, there is also a whole bunch of str..._P functions which directly take a program space string pointer. Hth, /Johny -- Johny Mattsson Senior Software Engineer DiUS Computing Pty. Ltd. where ideas are engineered
_______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
