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

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16-Bit C Compiler User’s Guide 3.4 FILE NAMING CONVENTIONS 3.5 OPTIONS The compilation driver recognizes the following file extensions, which are case-sensitive. TABLE 3-1: FILE NAMES Extensions Definition file.c A C source file that must be preprocessed. file.h A header file (not to be compiled or linked). file.i A C source file that should not be preprocessed. file.o An object file. file.p A pre procedural-abstraction assembly language file. file.s Assembler code. file.S Assembler code that must be preprocessed. other A file to be passed to the linker. The compiler has many options for controlling compilation, all of which are case-sensitive. • Options Specific to dsPIC DSC Devices • Options for Controlling the Kind of Output • Options for Controlling the C Dialect • Options for Controlling Warnings and Errors • Options for Debugging • Options for Controlling Optimization • Options for Controlling the Preprocessor • Options for Assembling • Options for Linking • Options for Directory Search • Options for Code Generation Conventions DS51284H-page 34 © 2008 Microchip Technology Inc.
Using the Compiler on the Command Line 3.5.1 Options Specific to dsPIC DSC Devices For more information on the memory models, see Section 4.6 “Memory Models”. TABLE 3-2: dsPIC ® DSC DEVICE-SPECIFIC OPTIONS Option Definition -mconst-in-code Put constants in the auto_psv space. The compiler will access these constants using the PSV window. (This is the default.) -mconst-in-data Put constants in the data memory space. -merrata= This option enables specific errata work arounds identified by id. Valid id[,id]* values for id change from time to time and may not be required for a particular variant. An id of list will display the currently supported errata identifiers along with a brief description of the errata. An id of all will enable all currently supported errata work arounds. -mlarge-code Compile using the large code model. No assumptions are made about the locality of called functions. When this option is chosen, single functions that are larger than 32k are not supported and may cause assembly-time errors since all branches inside of a function are of the short form. -mlarge-data Compile using the large data model. No assumptions are made about the location of static and external variables. -mcpu= This option selects the target processor ID (and communicates it to the target assembler and linker if those tools are invoked). This option affects how some predefined constants are set; see Section 3.7 “Predefined Macro Names” for more information. A full list of accepted targets can be seen in the Readme.htm file that came with the release. -mpa (1) Enable the procedure abstraction optimization. There is no limit on the nesting level. -mpa=n (1) -mno-pa (1) Enable the procedure abstraction optimization up to level n. If n is zero, the optimization is disabled. If n is 1, first level of abstraction is allowed; that is, instruction sequences in the source code may be abstracted into a subroutine. If n is 2, a second level of abstraction is allowed; that is, instructions that were put into a subroutine in the first level may be abstracted into a subroutine one level deeper. This pattern continues for larger values of n. The net effect is to limit the subroutine call nesting depth to a maximum of n. Do not enable the procedure abstraction optimization. (This is the default.) Note 1: The procedure abstractor behaves as the inverse of inlining functions. The pass is designed to extract common code sequences from multiple sites throughout a translation unit and place them into a common area of code. Although this option generally does not improve the run-time performance of the generated code, it can reduce the code size significantly. Programs compiled with -mpa can be harder to debug; it is not recommended that this option be used while debugging using the COFF object format. The procedure abstractor is invoked as a separate phase of compilation, after the production of an assembly file. This phase does not optimize across translation units. When the procedure-optimizing phase is enabled, inline assembly code must be limited to valid machine instructions. Invalid machine instructions or instruction sequences, or assembler directives (sectioning directives, macros, include files, etc.) must not be used, or the procedure abstraction phase will fail, inhibiting the creation of an output file. © 2008 Microchip Technology Inc. DS51284H-page 35
Page 1 and 2: MPLAB ® C COMPILER FOR PIC24 MCUs
Page 5 and 6: Table of Contents A.5 Identifiers .
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 39: MPLAB ® C COMPILER FOR PIC24 MCUs
Page 43 and 44: Using the Compiler on the Command L
Page 65 and 66: 3.6 ENVIRONMENT VARIABLES Using the
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Page 71 and 72: 4.5 MEMORY SPACES Run Time Environm
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Page 79 and 80: 4.11 FUNCTION CALL CONVENTIONS Run
Page 81 and 82: Run Time Environment The compiler a
Page 83 and 84: 4.14.2 String Literals as Arguments
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Page 87 and 88: 6.1 INTRODUCTION MPLAB ® C COMPILE
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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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7.1 INTRODUCTION 7.2 HIGHLIGHTS MPL
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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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8.1 INTRODUCTION 8.2 HIGHLIGHTS MPL
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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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MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

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