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MPLAB ? C32 C COMPILER
USER ’S GUIDE
Chapter 2. Library Environment
2.1
2.2
INTRODUCTION
This chapter discusses using the MPLAB C32 C libraries.
HIGHLIGHTS
Items discussed in this chapter are:
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2.3
2.4
STANDARD I/O
The standard input/output library functions support two modes of operation, simple and
full. The simple mode supports I/O via a two function interface on a single character
device used for stdout , stdin and stderr . The full mode supports the complete set
of standard I/O functions. The library will use full mode if the application calls fopen ,
otherwise simple mode is used.
Simple mode performs I/O using four functions, _mon_puts, _mon_write ,
_mon_getc and _mon_putc , to perform the raw device I/O. The default
implementation of _mon_getc always returns failure (i.e., by default, character input is
not available). The default implementation of _mon_putc writes a character to UART2.
It is assumed that the application has performed any necessary initialization of the
UART. The default implementations of _mon_puts and _mon_write both simply call
_mon_putc iteratively. All four functions are defined as weak functions, and so may be
overridden by the user application if different functionality is desired. See the MPLAB
C32 C Compiler Libraries for detailed information on these functions.
An application using full mode must supply the standard low-level POSIX I/O functions
open , read , write , lseek and close . No default implementations are provided. See
the “ MPLAB C32 C Compiler Libraries” (DS51685) for detailed information on these
functions.
WEAK FUNCTIONS
The standard library provides a number of weak function implementations of low level
interfaces. User applications which use this functionality will often implement more full
featured versions of these functions. For details of the specific functions, see the
“ MPLAB C32 C Compiler Libraries ” (DS51685).
As described above, the standard I/O library functions utilize a set of weak functions for
simple output: _mon_write , _mon_putc , _mon_puts , and _mon_getc .
The standard startup code (See Section 5.7 “Startup and Initialization” ) invokes a
number of weak functions directly and provides weak handlers for bootstrap exceptions
and general exceptions: _on_reset , _nmi_handler ,
_bootstrap_exception_handler , _general_exception_handler , and
_on_bootstrap .
? 2007 Microchip Technology Inc.
DS51686A-page 43
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