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

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16-Bit C Compiler User’s Guide 4.13 Bit Reversed and Modulo Addressing ........................................................ 76 4.14 Program Space Visibility (PSV) Usage ...................................................... 76 Chapter 5. Data Types 5.1 Introduction ................................................................................................... 79 5.2 Highlights ...................................................................................................... 79 5.3 Data Representation .................................................................................... 79 5.4 Integer .......................................................................................................... 79 5.5 Floating Point ............................................................................................... 80 5.6 Pointers ........................................................................................................ 80 Chapter 6. Additional C Pointer Types 6.1 Introduction ................................................................................................... 81 6.2 Managed PSV Pointers ................................................................................ 81 6.3 PMP Pointers ............................................................................................... 83 6.4 External Pointers .......................................................................................... 85 Chapter 7. Device Support Files 7.1 Introduction ................................................................................................... 91 7.2 Highlights ...................................................................................................... 91 7.3 Processor Header Files ................................................................................ 91 7.4 Register Definition Files ............................................................................... 92 7.5 Using SFRs .................................................................................................. 93 7.6 Using Macros ............................................................................................... 95 7.7 Accessing EEDATA from C Code - dsPIC30F dSCs only ............................ 96 Chapter 8. Interrupts 8.1 Introduction ................................................................................................... 99 8.2 Highlights ...................................................................................................... 99 8.3 Writing an Interrupt Service Routine .......................................................... 100 8.4 Writing the Interrupt Vector ........................................................................ 102 8.5 Interrupt Service Routine Context Saving .................................................. 112 8.6 Latency ....................................................................................................... 112 8.7 Nesting Interrupts ....................................................................................... 112 8.8 Enabling/Disabling Interrupts ..................................................................... 113 8.9 Sharing Memory Between Interrupt Service Routines and Mainline Code 114 8.10 PSV Usage with Interrupt Service Routines ............................................. 117 Chapter 9. Mixing Assembly Language and C Modules 9.1 Introduction ................................................................................................. 119 9.2 Highlights .................................................................................................... 119 9.3 Mixing Assembly Language and C Variables and Functions ..................... 119 9.4 Using Inline Assembly Language ............................................................... 121 Appendix A. Implementation-Defined Behavior A.1 Introduction ................................................................................................ 129 A.2 Highlights ................................................................................................... 129 A.3 Translation ................................................................................................. 130 A.4 Environment ............................................................................................... 130 DS51284H-page iv © 2008 Microchip Technology Inc.
Table of Contents A.5 Identifiers ................................................................................................... 131 A.6 Characters ................................................................................................. 131 A.7 Integers ...................................................................................................... 132 A.8 Floating Point ............................................................................................. 132 A.9 Arrays and Pointers ................................................................................... 133 A.10 Registers .................................................................................................. 133 A.11 Structures, Unions, Enumerations and Bit fields ...................................... 134 A.12 Qualifiers .................................................................................................. 134 A.13 Declarators ............................................................................................... 134 A.14 Statements ............................................................................................... 134 A.15 Preprocessing Directives ......................................................................... 135 A.16 Library Functions ..................................................................................... 136 A.17 Signals ..................................................................................................... 137 A.18 Streams and Files .................................................................................... 137 A.19 tmpfile ...................................................................................................... 138 A.20 errno ......................................................................................................... 138 A.21 Memory .................................................................................................... 138 A.22 abort ......................................................................................................... 138 A.23 exit ........................................................................................................... 138 A.24 getenv ...................................................................................................... 139 A.25 system ...................................................................................................... 139 A.26 strerror ..................................................................................................... 139 Appendix B. Built-in Functions B.1 Introduction ................................................................................................ 141 B.2 Built-In Function List .................................................................................. 142 Appendix C. Diagnostics C.1 Introduction ................................................................................................ 163 C.2 Errors ......................................................................................................... 163 C.3 Warnings .................................................................................................... 182 Appendix D. MPLAB C Compiler for PIC18 MCUs vs. 16-Bit Devices D.1 Introduction ................................................................................................ 203 D.2 Highlights ................................................................................................... 203 D.3 Data Formats ............................................................................................. 204 D.4 Pointers ...................................................................................................... 204 D.5 Storage Classes ........................................................................................ 204 D.6 Stack Usage .............................................................................................. 204 D.7 Storage Qualifiers ...................................................................................... 205 D.8 Predefined Macro Names .......................................................................... 205 D.9 Integer Promotions .................................................................................... 205 D.10 String Constants ...................................................................................... 205 D.11 Access Memory ....................................................................................... 205 D.12 Inline Assembly ........................................................................................ 205 D.13 Pragmas .................................................................................................. 206 D.14 Memory Models ....................................................................................... 207 © 2008 Microchip Technology Inc. DS51284H-page v
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Page 7 and 8: INTRODUCTION MPLAB ® C COMPILER FO
Page 9 and 10: CONVENTIONS USED IN THIS GUIDE The
Page 11 and 12: THE MICROCHIP WEB SITE Preface C Re
Page 13 and 14: 1.1 INTRODUCTION 1.2 HIGHLIGHTS MPL
Page 15 and 16: 1.5 COMPILER FEATURE SET Compiler O
Page 19 and 20: Differences Between 16-Bit Device C
Page 41 and 42: Using the Compiler on the Command L
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Using the Compiler on the Command L
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3.6 ENVIRONMENT VARIABLES Using the
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4.1 INTRODUCTION 4.2 HIGHLIGHTS 4.3
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4.5 MEMORY SPACES Run Time Environm
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Run Time Environment 1. It is possi
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4.8 SOFTWARE STACK Run Time Environ
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FIGURE 4-2: CALL OR RCALL Stack gro
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4.11 FUNCTION CALL CONVENTIONS Run
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Run Time Environment The compiler a
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4.14.2 String Literals as Arguments
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5.1 INTRODUCTION 5.2 HIGHLIGHTS MPL
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6.1 INTRODUCTION MPLAB ® C COMPILE
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6.3 PMP POINTERS Additional C Point
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6.4 EXTERNAL POINTERS 6.3.3 Define
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ead_external16 Additional C Pointer
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Additional C Pointer Types } else {
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7.5 USING SFRS Device Support Files
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7.6 USING MACROS Device Support Fil
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EXAMPLE 7-2: EEDATA ACCESS VIA PSV
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Interrupts When using the interrupt
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8.4.1 dsPIC30F DSCs (Non-SMPS) Inte
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8.4.3 PIC24F MCUs Interrupt Vectors
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Interrupts TABLE 8-3: INTERRUPT VEC
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Interrupts TABLE 8-4: INTERRUPT VEC
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85 _Interrupt85 _AltInterrupt85 Res
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8.8 ENABLING/DISABLING INTERRUPTS I
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Interrupts 2. Unsafe: read bar inte
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LATGbits.LATG2 = 0; /* No problem l
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MPLAB ® C COMPILER FOR PIC24 MCUs
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Mixing Assembly Language and C Modu
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A.5 IDENTIFIERS A.6 CHARACTERS Impl
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Implementation-Defined Behavior The
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A.15 PREPROCESSING DIRECTIVES Imple
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A.17 SIGNALS A.18 STREAMS AND FILES
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A.24 GETENV A.25 SYSTEM A.26 STRERR
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B.1 INTRODUCTION MPLAB ® C COMPILE
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__builtin_btg Built-in Functions De
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__builtin_clr_prefetch Argument: xp
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__builtin_dmaoffset Built-in Functi
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__builtin_fbcl Built-in Functions A
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__builtin_modsd Argument: dividend
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__builtin_mpy Error Messages An err
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__builtin_mulss Built-in Functions
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__builtin_psvoffset Built-in Functi
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__builtin_subab Built-in Functions
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__builtin_tblwth Built-in Functions
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C.1 INTRODUCTION C.2 ERRORS MPLAB
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Diagnostics ambiguous abbreviation
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Diagnostics cast specifies function
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F Diagnostics ‘identifier’ fail
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Diagnostics initializer for static
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Diagnostics invalid use of undefine
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N Diagnostics negative width in bit
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R Diagnostics redeclaration of ‘i
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Diagnostics symbol ‘symbol’ not
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Diagnostics void expression between
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Diagnostics anonymous union declare
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Diagnostics comparison between sign
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duplicate ‘const’ The ‘const
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Diagnostics function might be possi
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Diagnostics ‘identifier’ is nar
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Diagnostics library function ‘ide
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P Diagnostics parameter has incompl
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Diagnostics shift count >= width of
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Diagnostics too many arguments for
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V Diagnostics __VA_ARGS__ can only
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MPLAB C Compiler for PIC18 MCUs vs.
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E.1 INTRODUCTION E.2 HIGHLIGHTS MPL
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G.1 PREAMBLE MPLAB ® C COMPILER FO
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G.3 VERBATIM COPYING G.4 COPYING IN
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GNU Free Documentation License incl
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Glossary File Registers On-chip dat
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Glossary Machine Language A set of
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Glossary Stack, Software Memory use
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Symbols __builtin_add..............
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-fpack-struct .....................
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-idirafter.........................
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Peephole Optimization..............
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-Wsequence-point...................
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