Specifications

CAVR-4
Contents
xi
Writing efficient code ......................................................................... 130
Saving stack space and RAM memory ............................................ 131
Function prototypes .......................................................................... 131
Integer types and bit negation .......................................................... 132
Protecting simultaneously accessed variables .................................. 132
Accessing special function registers ................................................ 133
Non-initialized variables .................................................................. 134
Part 2. Compiler reference .................................................... 135
Data representation ...................................................................................... 137
Alignment ................................................................................................ 137
Alignment in the AVR IAR C/C++ Compiler ................................. 137
Basic data types .................................................................................... 138
Integer types ..................................................................................... 138
Floating-point types ........................................................................ 139
Pointer types .......................................................................................... 141
Function pointers .............................................................................. 141
Data pointers .................................................................................... 141
Casting ............................................................................................. 142
Structure types ...................................................................................... 143
Alignment ......................................................................................... 143
General layout ................................................................................. 143
Type and object attributes ............................................................... 144
Type attributes .................................................................................. 144
Object attributes ............................................................................... 145
Declaring objects in source files ...................................................... 146
Declaring objects volatile ................................................................ 146
Data types in C++ ................................................................................. 147
Segment reference ......................................................................................... 149
Summary of segments ...................................................................... 149
Descriptions of segments .................................................................. 151