MPLAB C32 C COMPILER USER'S GUIDE

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MPLAB ® C32 C Compiler User’s GuideNOTES:DS51686A-page 42© 2007 Microchip Technology Inc.
MPLAB ® C32 C COMPILERUSER’S GUIDEChapter 2. Library Environment2.1 INTRODUCTION2.2 HIGHLIGHTS2.3 STANDARD I/O2.4 WEAK FUNCTIONSThis chapter discusses using the MPLAB C32 C libraries.Items discussed in this chapter are:• Standard I/O• Weak Functions• “Helper” Header Files• MultilibsThe standard input/output library functions support two modes of operation, simple andfull. The simple mode supports I/O via a two function interface on a single characterdevice used for stdout, stdin and stderr. The full mode supports the complete setof 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 defaultimplementation of _mon_getc always returns failure (i.e., by default, character input isnot available). The default implementation of _mon_putc writes a character to UART2.It is assumed that the application has performed any necessary initialization of theUART. 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 beoverridden by the user application if different functionality is desired. See the MPLABC32 C Compiler Libraries for detailed information on these functions.An application using full mode must supply the standard low-level POSIX I/O functionsopen, read, write, lseek and close. No default implementations are provided. Seethe “MPLAB C32 C Compiler Libraries” (DS51685) for detailed information on thesefunctions.The standard library provides a number of weak function implementations of low levelinterfaces. User applications which use this functionality will often implement more fullfeatured 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 forsimple output: _mon_write, _mon_putc, _mon_puts, and _mon_getc.The standard startup code (See Section 5.7 “Startup and Initialization”) invokes anumber of weak functions directly and provides weak handlers for bootstrap exceptionsand general exceptions: _on_reset, _nmi_handler,_bootstrap_exception_handler, _general_exception_handler, and_on_bootstrap.© 2007 Microchip Technology Inc. DS51686A-page 43
Page 1 and 2: MPLAB C32C COMPILERUSER’S GUIDE©
Page 3 and 4: Table of ContentsMPLAB ® C32 C COM
Page 5 and 6: PrefaceMPLAB ® C32 C COMPILERUSER
Page 7 and 8: PrefaceRECOMMENDED READINGThis user
Page 9 and 10: PrefaceDEVELOPMENT SYSTEMS CUSTOMER
Page 11 and 12: Chapter 1. Language SpecificsMPLAB
Page 13 and 14: Language Specifics1.5.6 limits.hThe
Page 15 and 16: Language Specifics__mips___mips_MIP
Page 17 and 18: Language SpecificsThe first_to_chec
Page 19 and 20: Language SpecificsGenerate a branch
Page 21 and 22: Language Specifics1.8.2 Options for
Page 25 and 26: Language SpecificsTABLE 1-5:-Wswitc
Page 27 and 28: Language SpecificsThe following -W
Page 29 and 30: Language SpecificsTABLE 1-6:-Wredun
Page 33 and 34: Language SpecificsTABLE 1-9: SPECIF
Page 35 and 36: Language SpecificsOptions of the fo
Page 37 and 38: Language SpecificsTABLE 1-11:-I--Id
Page 39 and 40: Language SpecificsTABLE 1-11: PREPR
Page 41 and 42: Language Specifics1.8.10 Options fo
Page 43 and 44: Language SpecificsTABLE 1-15:Option
Page 45: Language Specifics1.10 COMPILING MU
Page 49 and 50: Library Environment2.6.2 What Multi
Page 51 and 52: Chapter 3. InterruptsMPLAB ® C32 C
Page 53 and 54: Interrupts3.4.2 Vector PragmaThe ve
Page 55 and 56: MPLAB ® C32 C COMPILERUSER’S GUI
Page 57 and 58: Low Level Processor Control4.6 SPEC
Page 59 and 60: Low Level Processor Control4.8.1.1
Page 63 and 64: Compiler Runtime Environment5.5 HEA
Page 65 and 66: Compiler Runtime Environment5.7 STA
Page 67 and 68: Compiler Runtime EnvironmentWithout
Page 69 and 70: Compiler Runtime EnvironmentFIGURE
Page 71 and 72: Compiler Runtime Environment5.7.2.9
Page 75 and 76: Compiler Runtime Environment• The
Page 77 and 78: Compiler Runtime Environment5.7.4 S
Page 79 and 80: Compiler Runtime Environment5.8.3 P
Page 81 and 82: Compiler Runtime Environment(i.e.,
Page 85 and 86: Compiler Runtime Environment.dbg_da
Page 87 and 88: Compiler Runtime Environment*/. = A
Page 89 and 90: Compiler Runtime Environment5.9 RAM
Page 93 and 94: Implementation Defined BehaviorISO
Page 95 and 96: Implementation Defined BehaviorImpl
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Implementation Defined BehaviorISO
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Implementation Defined BehaviorImpl
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Implementation Defined BehaviorImpl
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MPLAB ® C32 C COMPILERUSER’S GUI
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IndexMPLAB ® C32 C COMPILERUSER’
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IndexCHAR_BIT .....................
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Indexread..........................
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Index-fcaller-saves ...............
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IndexStack Location ...............
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IndexNOTES:© 2007 Microchip Techno
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MPLAB C32 C COMPILER USER'S GUIDE

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