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16-Bit Language Tools Libraries
2.2
USING THE STANDARD C LIBRARIES
Building an application which utilizes the standard C libraries requires two types of files:
header files and library files.
2.2.1
Header Files
All standard C library entities are declared or defined in one or more standard headers
(See list in Section 2.1.3 “Chapter Organization” .) To make use of a library entity in
a program, write an include directive that names the relevant standard header.
The contents of a standard header is included by naming it in an include directive, as in:
#include <stdio.h> /* include I/O facilities */
The standard headers can be included in any order. Do not include a standard header
within a declaration. Do not define macros that have the same names as keywords
before including a standard header.
A standard header never includes another standard header.
2.2.2
Library Files
The archived library files contain all the individual object files for each library function.
When linking an application, the library file must be provided as an input to the linker
(using the --library or -l linker option) such that the functions used by the
application may be linked into the application.
A typical C application will require three library files: libc- omf .a , libm- omf .a , and
libpic30- omf .a . (See Section 1.2 “OMF-Specific Libraries/Start-up Modules” for
more on OMF-specific libraries.) These libraries will be included automatically if linking
is performed using the compiler.
DS51456E-page 12
Note:
Some standard library functions require a heap. These include the standard
I/O functions that open files and the memory allocation functions. See the
“ MPLAB ? Assembler, Linker and Utilities for PIC24 MCUs and dsPIC ?
DSCs User’s Guide” (DS51317) and “ MPLAB ? C Compiler for PIC24
MCUs and dsPIC ? DSCs User ’s Guide” (DS51284) for more information on
the heap.
? 2008 Microchip Technology Inc.
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相关PDF资料
SW006015
C COMPILER MPLAB C32
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
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