NAME

       avr_string - <string.h>: Strings

SYNOPSIS

   Macros
       #define _FFS(x)

Detailed Description

       #include <string.h>

       The string functions perform string operations on NULL terminated strings.

       Note
           If the strings you are working on resident in program space (flash), you will need to
           use the string functions described in <avr/pgmspace.h>: Program Space Utilities.

Macro Definition Documentation

   #define _FFS(x)
       This macro finds the first (least significant) bit set in the input value.

       This macro is very similar to the function ffs() except that it evaluates its argument at
       compile-time, so it should only be applied to compile-time constant expressions where it
       will reduce to a constant itself. Application of this macro to expressions that are not
       constant at compile-time is not recommended, and might result in a huge amount of code
       generated.

       Returns
           The _FFS() macro returns the position of the first (least significant) bit set in the
           word val, or 0 if no bits are set. The least significant bit is position 1. Only 16
           bits of argument are evaluted.

Author

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