MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

16-Bit C Compiler User’s Guide
3.10 NOTABLE SYMBOLS
z = Add(x,y);
return 0;
}
File 2
/* add.c */
#include
unsigned int
Add(unsigned int a, unsigned int b)
{
return(a+b);
}
Compile both files by typing the following at a DOS prompt:
C:\> pic30-gcc -o ex1.o ex1.c add.c
This command compiles the modules ex1.c and add.c. The compiled modules are
linked with the compiler libraries and the executable file ex1.o is created.
The 16-bit linker defines several symbols that may be used in your C code development.
Please see the MPLAB Assembler, Linker and Utilities for PIC24 MCUs and
dsPIC ® DSCs User’s Guide (DS51317) for more information.
A useful address symbol, _PROGRAM_END, is defined in program memory to mark the
highest address used by a CODE or PSV section. It should be referenced with the
address operator (&) in a built-in function call that accepts the address of an object in
program memory. This symbol can be used by applications as an end point for checksum
calculations.
For example:
__builtin_tblpage(&_PROGRAM_END)
__builtin_tbloffset(&_PROGRAM_END)
_prog_addressT big_addr;
_init_prog_address(big_addr, _PROGRAM_END)
DS51284H-page 62 © 2008 Microchip Technology Inc.