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

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16-Bit C Compiler User’s Guide Pragma A directive that has meaning to a specific compiler. Often a pragma is used to convey implementation-defined information to the compiler. The MPLAB C Compiler for PIC24 MCUs and dsPIC ® DSCs uses attributes to convey this information. Precedence Rules that define the order of evaluation in expressions. Program Counter The location that contains the address of the instruction that is currently executing. Program Memory The memory area in a device where instructions are stored. Prologue A portion of compiler-generated code that is responsible for allocating stack space, preserving registers and performing any other machine-specific requirement specified in the run-time model. This code executes before any user code for a given function. RAM Random Access Memory (Data Memory). Memory in which information can be accessed in any order. Recursive Calls A function that calls itself, either directly or indirectly. Relocatable An object file whose sections have not been assigned to a fixed location in memory. Relocation A process performed by the linker in which absolute addresses are assigned to relocatable sections and all symbols in the relocatable sections are updated to their new addresses. ROM Read Only Memory (Program Memory). Memory that cannot be modified. Run Time Model Describes the use of target architecture resources. Section A named sequence of code or data. SFR See Special Function Registers. Simulator A software program that models the operation of devices. Source Code The form in which a computer program is written by the programmer. Source code is written in some formal programming language which can be translated into machine code or executed by an interpreter. Source File An ASCII text file containing source code. Special Function Registers The portion of data memory (RAM) dedicated to registers that control I/O processor functions, I/O status, timers or other modes or peripherals. DS51284H-page 226 © 2008 Microchip Technology Inc.
Glossary Stack, Software Memory used by an application for storing return addresses, function parameters and local variables. This memory is typically managed by the compiler when developing code in a high-level language. Storage Class Determines the lifetime of an object. Storage Qualifier Indicates special properties of an object (e.g., volatile). Trigraphs Three-character sequences, all starting with ??, that are defined by ISO C as replacements for single characters. Uninitialized Data Data which is defined without an initial value. In C, int myVar; defines a variable which will reside in an uninitialized data section. Vector The memory locations from which an application starts execution when a specific event occurs, such as a reset or interrupt. Warning Warnings report conditions that may indicate a problem, but do not halt processing. In the 16-bit compiler, warning messages report the source file name and line number, but include the text ‘warning:’ to distinguish them from error messages. © 2008 Microchip Technology Inc. DS51284H-page 227
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MPLAB ® C COMPILER FOR PIC24 MCUs
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Table of Contents A.5 Identifiers .
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INTRODUCTION MPLAB ® C COMPILER FO
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CONVENTIONS USED IN THIS GUIDE The
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THE MICROCHIP WEB SITE Preface C Re
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1.1 INTRODUCTION 1.2 HIGHLIGHTS MPL
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1.5 COMPILER FEATURE SET Compiler O
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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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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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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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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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Page 225 and 226: GNU Free Documentation License incl
Page 229 and 230: Glossary File Registers On-chip dat
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Page 235 and 236: Symbols __builtin_add..............
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Page 241 and 242: Peephole Optimization..............
Page 243 and 244: -Wsequence-point...................
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