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

More documents

Recommendations

Info

16-Bit C Compiler User’s Guide ISO C restricts enumerator values to range of ‘int’ The range of enumerator values must not exceed the range of the int type. ISO C89 forbids compound literals Compound literals are not valid in ISO C89. ISO C89 forbids mixed declarations and code Declarations should be done first before any code is written. It should not be mixed in with the code. ISO C90 does not support ‘[*]’ array declarators Variable length arrays are not supported in ISO C90. ISO C90 does not support complex types Complex types, such as __complex__ float x, are not supported in ISO C90. ISO C90 does not support flexible array members A flexible array member is a new feature in C99. ISO C90 does not support it. ISO C90 does not support ‘long long’ The long long type is not supported in ISO C90. ISO C90 does not support ‘static’ or type qualifiers in parameter array declarators When using an array as a parameter to a function, ISO C90 does not allow the array declarator to use ‘static’ or type qualifiers. ISO C90 does not support the ‘char’ ‘function’ format ISO C does not support the specification character ‘char’ for the specified function format. ISO C90 does not support the ‘modifier’ ‘function’ length modifier The specified modifier is not supported as a length modifier for the given function. ISO C90 forbids variable-size array ‘name’ In ISO C90, the number of elements in the array must be specified by an integer constant expression. L label ‘identifier’ defined but not used The specified label was defined, but not referenced. large integer implicitly truncated to unsigned type An integer constant value appears in the source code without an explicit unsigned modifier, yet the number cannot be represented as a signed int; therefore, the compiler automatically treats it as an unsigned int. left-hand operand of comma expression has no effect One of the operands of a comparison is a promoted ~unsigned, while the other is unsigned. left shift count >= width of type Shift counts should be less than the number of bits in the type being shifted. Otherwise, the shift is meaningless, and the result is undefined. left shift count is negative Shift counts should be positive. A negative left shift count does not mean shift right; it is meaningless. DS51284H-page 192 © 2008 Microchip Technology Inc.
Diagnostics library function ‘identifier’ declared as non-function The specified function has the same name as a library function, yet is declared as something other than a function. line number out of range The limit for the line number for a #line directive in C89 is 32767 and in C99 is 2147483647. ‘identifier’ locally external but globally static The specified identifier is locally external but globally static. This is suspect. location qualifier ‘qualifier’ ignored Location qualifiers, which include ‘grp’ and ‘sfr’, are not used in the compiler, but are there for compatibility with MPLAB C Compiler for PIC18 MCUs. ‘long’ switch expression not converted to ‘int’ in ISO C ISO C does not convert ‘long’ switch expressions to ‘int’. M ‘main’ is usually a function The identifier main is usually used for the name of the main entry point of an application. The compiler detected that it was being used in some other way, for example, as the name of a variable. ‘operation’ makes integer from pointer without a cast A pointer has been implicitly converted to an integer. ‘operation’ makes pointer from integer without a cast An integer has been implicitly converted to a pointer. malformed ‘#pragma pack-ignored’ The syntax of the pack pragma is incorrect. malformed ‘#pragma pack(pop[,id])-ignored’ The syntax of the pack pragma is incorrect. malformed ‘#pragma pack(push[,id],)-ignored’ The syntax of the pack pragma is incorrect. malformed ‘#pragma weak-ignored’ The syntax of the weak pragma is incorrect. ‘identifier’ might be used uninitialized in this function The compiler detected a control path though a function which might use the specified identifier before it has been initialized. missing braces around initializer A required set of braces around an initializer is missing. missing initializer An initializer is missing. modification by ‘asm’ of read-only variable ‘identifier’ A const variable is the left-hand-side of an assignment in an ‘asm’ statement. multi-character character constant A character constant contains more than one character. © 2008 Microchip Technology Inc. DS51284H-page 193
Page 1 and 2:
MPLAB ® C COMPILER FOR PIC24 MCUs
Page 3 and 4:
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 17 and 18:
Page 19 and 20:
Differences Between 16-Bit Device C
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Using the Compiler on the Command L
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
3.6 ENVIRONMENT VARIABLES Using the
Page 67 and 68:
Page 69 and 70:
4.1 INTRODUCTION 4.2 HIGHLIGHTS 4.3
Page 71 and 72:
4.5 MEMORY SPACES Run Time Environm
Page 73 and 74:
Run Time Environment 1. It is possi
Page 75 and 76:
4.8 SOFTWARE STACK Run Time Environ
Page 77 and 78:
FIGURE 4-2: CALL OR RCALL Stack gro
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
Page 85 and 86:
Page 87 and 88:
6.1 INTRODUCTION MPLAB ® C COMPILE
Page 89 and 90:
6.3 PMP POINTERS Additional C Point
Page 91 and 92:
6.4 EXTERNAL POINTERS 6.3.3 Define
Page 93 and 94:
ead_external16 Additional C Pointer
Page 95 and 96:
Additional C Pointer Types } else {
Page 97 and 98:
Page 99 and 100:
7.5 USING SFRS Device Support Files
Page 101 and 102:
7.6 USING MACROS Device Support Fil
Page 103 and 104:
EXAMPLE 7-2: EEDATA ACCESS VIA PSV
Page 105 and 106:
Page 107 and 108:
Interrupts When using the interrupt
Page 109 and 110:
8.4.1 dsPIC30F DSCs (Non-SMPS) Inte
Page 111 and 112:
8.4.3 PIC24F MCUs Interrupt Vectors
Page 113 and 114:
Interrupts TABLE 8-3: INTERRUPT VEC
Page 115 and 116:
Interrupts TABLE 8-4: INTERRUPT VEC
Page 117 and 118:
85 _Interrupt85 _AltInterrupt85 Res
Page 119 and 120:
8.8 ENABLING/DISABLING INTERRUPTS I
Page 121 and 122:
Interrupts 2. Unsafe: read bar inte
Page 123 and 124:
LATGbits.LATG2 = 0; /* No problem l
Page 125 and 126:
Page 127 and 128:
Mixing Assembly Language and C Modu
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
A.5 IDENTIFIERS A.6 CHARACTERS Impl
Page 139 and 140:
Implementation-Defined Behavior The
Page 141 and 142:
A.15 PREPROCESSING DIRECTIVES Imple
Page 143 and 144:
A.17 SIGNALS A.18 STREAMS AND FILES
Page 145 and 146:
A.24 GETENV A.25 SYSTEM A.26 STRERR
Page 147 and 148: B.1 INTRODUCTION MPLAB ® C COMPILE
Page 149 and 150: __builtin_btg Built-in Functions De
Page 151 and 152: __builtin_clr_prefetch Argument: xp
Page 153 and 154: __builtin_dmaoffset Built-in Functi
Page 155 and 156: __builtin_fbcl Built-in Functions A
Page 157 and 158: __builtin_modsd Argument: dividend
Page 159 and 160: __builtin_mpy Error Messages An err
Page 161 and 162: __builtin_mulss Built-in Functions
Page 163 and 164: __builtin_psvoffset Built-in Functi
Page 165 and 166: __builtin_subab Built-in Functions
Page 167 and 168: __builtin_tblwth Built-in Functions
Page 169 and 170: C.1 INTRODUCTION C.2 ERRORS MPLAB
Page 171 and 172: Diagnostics ambiguous abbreviation
Page 173 and 174: Diagnostics cast specifies function
Page 175 and 176: F Diagnostics ‘identifier’ fail
Page 177 and 178: Diagnostics initializer for static
Page 179 and 180: Diagnostics invalid use of undefine
Page 181 and 182: N Diagnostics negative width in bit
Page 183 and 184: R Diagnostics redeclaration of ‘i
Page 185 and 186: Diagnostics symbol ‘symbol’ not
Page 187 and 188: Diagnostics void expression between
Page 189 and 190: Diagnostics anonymous union declare
Page 191 and 192: Diagnostics comparison between sign
Page 193 and 194: duplicate ‘const’ The ‘const
Page 195 and 196: Diagnostics function might be possi
Page 197: Diagnostics ‘identifier’ is nar
Page 201 and 202: P Diagnostics parameter has incompl
Page 203 and 204: Diagnostics shift count >= width of
Page 205 and 206: Diagnostics too many arguments for
Page 207 and 208: V Diagnostics __VA_ARGS__ can only
Page 209 and 210: MPLAB ® C COMPILER FOR PIC24 MCUs
Page 211 and 212: MPLAB C Compiler for PIC18 MCUs vs.
Page 217 and 218: E.1 INTRODUCTION E.2 HIGHLIGHTS MPL
Page 221 and 222: G.1 PREAMBLE MPLAB ® C COMPILER FO
Page 223 and 224: G.3 VERBATIM COPYING G.4 COPYING IN
Page 225 and 226: GNU Free Documentation License incl
Page 229 and 230: Glossary File Registers On-chip dat
Page 231 and 232: Glossary Machine Language A set of
Page 233 and 234: Glossary Stack, Software Memory use
Page 235 and 236: Symbols __builtin_add..............
Page 237 and 238: -fpack-struct .....................
Page 239 and 240: -idirafter.........................
Page 241 and 242: Peephole Optimization..............
Page 243 and 244: -Wsequence-point...................
show all

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

Create successful ePaper yourself

Delete template?

Save as template?