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

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16-Bit C Compiler User’s Guide DEVELOPMENT SYSTEMS CUSTOMER CHANGE NOTIFICATION SERVICE CUSTOMER SUPPORT Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. To register, access the Microchip web site at www.microchip.com, click on Customer Change Notification and follow the registration instructions. The Development Systems product group categories are: • Compilers – The latest information on Microchip C compilers, assemblers, linkers and other language tools. These include all MPLAB C compilers; all MPLAB assemblers (including MPASM assembler); all MPLAB linkers (including MPLINK object linker); and all MPLAB librarians (including MPLIB object librarian). • Emulators – The latest information on Microchip in-circuit emulators.These include the MPLAB REAL ICE, MPLAB ICE 2000 and MPLAB ICE 4000 in-circuit emulators • In-Circuit Debuggers – The latest information on Microchip in-circuit debuggers. These include the MPLAB ICD 2 in-circuit debugger and PICkit 2 debug express. • MPLAB ® IDE – The latest information on Microchip MPLAB IDE, the Windows ® Integrated Development Environment for development systems tools. This list is focused on the MPLAB IDE, MPLAB IDE Project Manager, MPLAB Editor and MPLAB SIM simulator, as well as general editing and debugging features. • Programmers – The latest information on Microchip programmers. These include the MPLAB PM3 and PRO MATE ® II device programmers and the PICSTART ® Plus and PICkit 1and 2 development programmers. Users of Microchip products can receive assistance through several channels: • Distributor or Representative • Local Sales Office • Field Application Engineer (FAE) • Technical Support Customers should contact their distributor, representative or field application engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://support.microchip.com DS51284H-page 6 © 2008 Microchip Technology Inc.
1.1 INTRODUCTION 1.2 HIGHLIGHTS MPLAB ® C COMPILER FOR PIC24 MCUs AND dsPIC ® DSCs USER’S GUIDE Chapter 1. Compiler Overview The dsPIC ® family of Digital Signal Controllers (dsPIC30F and dsPIC33F DSCs) combines the high performance required in DSP applications with standard microcontroller features needed for embedded applications. PIC24 MCUs are identical to the dsPIC DSCs with the exception that they do not have the digital signal controller module or that subset of instructions. They are a subset and are high-performance microcontrollers intended for applications that do not require the power of the DSC capabilities. All of these devices are fully supported by a complete set of software development tools, including an optimizing C compiler, an assembler, a linker and an archiver/ librarian. This chapter provides an overview of these tools and introduces the features of the optimizing C compiler, including how it works with the assembler and linker. The assembler and linker are discussed in detail in the “MPLAB ® Assembler, Linker and Utilities for PIC24 MCUs and dsPIC ® DSCs User’s Guide” (DS51317). Items discussed in this chapter are: • Compiler Description and Documentation • Compiler and Other Development Tools • Compiler Feature Set 1.3 COMPILER DESCRIPTION AND DOCUMENTATION There are three compilers that support Microchip 16-bit devices. The first compiler, previously called MPLAB C30, is now called: 1. MPLAB C Compiler for PIC24 MCUs and dsPIC ® DSCs – supports all 16-bit devices Two additional compilers, subsets of the first, are: 2. MPLAB C Compiler for dsPIC DSCs - supports dsPIC30F/33F DSC devices 3. MPLAB C Compiler for PIC24 MCUs - supports PIC24F/H MCU devices Each compiler is an ANSI x3.159-1989-compliant, optimizing C compiler. Each compiler is a Windows ® console application that provides a platform for developing C code. Each compiler is a port of the GCC compiler from the Free Software Foundation. The first and second compilers include language extensions for dsPIC DSC embedded-control applications. This manual describes the first compiler, as the second and third compilers are subsets of the first. Features that are unique to specific devices, and therefore specific compilers, are noted in the text with a star in the column (see Preface) and text identifying the devices to which the text applies. © 2008 Microchip Technology Inc. DS51284H-page 7
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: THE MICROCHIP WEB SITE Preface C Re
Page 15 and 16: 1.5 COMPILER FEATURE SET Compiler O
Page 19 and 20: Differences Between 16-Bit Device C
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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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Using the Compiler on the Command L
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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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