Atmel CAVR-4 Manual De Usuario
CAVR-4
Part 2. Compiler reference
243
Library functions
This chapter gives an introduction to the C and C++ library functions. It also
lists the header files used for accessing library definitions.
At the end of this chapter, all AVR-specific library functions are described.
For detailed reference information about the library functions, see the online
help system.
Introduction
The AVR IAR C/C++ Compiler provides two different libraries:
●
IAR DLIB Library is a complete ISO/ANSI C and C++ library. This library also
supports floating-point numbers in IEEE 754 format and it can be configured to
include different levels of support for locale, file descriptors, multibytes, et cetera.
supports floating-point numbers in IEEE 754 format and it can be configured to
include different levels of support for locale, file descriptors, multibytes, et cetera.
●
IAR CLIB Library is a light-weight library, which is not fully compliant with
ISO/ANSI C. Neither does it fully support floating-point numbers in IEEE 754
format or does it support Embedded C++.
ISO/ANSI C. Neither does it fully support floating-point numbers in IEEE 754
format or does it support Embedded C++.
Note that different customization methods are normally needed for these two libraries.
For additional information, see the chapter The DLIB runtime environment and The
CLIB runtime environment, respectively.
For additional information, see the chapter The DLIB runtime environment and The
CLIB runtime environment, respectively.
For detailed information about the library functions, see the online documentation
supplied with the product. There is also keyword reference information for the DLIB
library functions. To obtain reference information for a function, select the function
name in the editor window and press F1.
supplied with the product. There is also keyword reference information for the DLIB
library functions. To obtain reference information for a function, select the function
name in the editor window and press F1.
For additional information about library functions, see the chapter
Implementation-defined behavior in this guide.
Implementation-defined behavior in this guide.
HEADER FILES
Your application program gains access to library definitions through header files, which
it incorporates using the
it incorporates using the
#include
directive. The definitions are divided into a number
of different header files, each covering a particular functional area, letting you include
just those that are required.
just those that are required.
It is essential to include the appropriate header file before making any reference to its
definitions. Failure to do so can cause the call to fail during execution, or generate error
or warning messages at compile time or link time.
definitions. Failure to do so can cause the call to fail during execution, or generate error
or warning messages at compile time or link time.