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

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16-Bit C Compiler User’s Guide ‘identifier’ was used with no declaration before its definition When compiling with the -Wmissing-declarations command-line option, the compiler ensures that functions are declared before they are defined. In this case, a function definition was encountered without a preceding function declaration. ‘identifier’ was used with no prototype before its definition When compiling with the -Wmissing-prototypes command-line option, the compiler ensures that function prototypes are specified for all functions. In this case, a function call was encountered without a preceding function prototype for the called function. writing into constant object (arg n) When checking the argument list of a call to printf, scanf, etc., the compiler found that the specified argument number n was a const object that the format specifier indicated should be written into. Z zero-length identifier format string When checking the argument list of a call to printf, scanf, etc., the compiler found that the format string was empty (“”). DS51284H-page 202 © 2008 Microchip Technology Inc.
MPLAB ® C COMPILER FOR PIC24 MCUs AND dsPIC ® DSCs USER’S GUIDE Appendix D. MPLAB C Compiler for PIC18 MCUs vs. 16-Bit Devices D.1 INTRODUCTION D.2 HIGHLIGHTS The purpose of this chapter is to highlight the differences between the MPLAB C Compiler for PIC18 MCUs (formerly MPLAB C18) and the MPLAB C C Compiler for PIC24 MCUs and dsPIC ® DSCs (formerly MPLAB C30). For more details on the PIC18 MCU compiler, please refer to the “MPLAB ® C18 C Compiler User’s Guide” (DS51288). This chapter discusses the following areas of difference between the two compilers: • Data Formats • Pointers • Storage Classes • Stack Usage • Storage Qualifiers • Predefined Macro Names • Integer Promotions • String Constants • Access Memory • Inline Assembly • Pragmas • Memory Models • Calling Conventions • Startup Code • Compiler-Managed Resources • Optimizations • Object Module Format • Implementation-Defined Behavior • Bit fields © 2008 Microchip Technology Inc. DS51284H-page 203
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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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Page 229 and 230: Glossary File Registers On-chip dat
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Page 241 and 242: Peephole Optimization..............
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