avrlibdefs.h

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/*! \file avrlibdefs.h \brief AVRlib global defines and macros. */
//*****************************************************************************
//
// File Name    : 'avrlibdefs.h'
// Title        : AVRlib global defines and macros include file
// Author       : Pascal Stang
// Created      : 7/12/2001
// Revised      : 9/30/2002
// Version      : 1.1
// Target MCU   : Atmel AVR series
// Editor Tabs  : 4
//
//  Description : This include file is designed to contain items useful to all
//                  code files and projects, regardless of specific implementation.
//
// This code is distributed under the GNU Public License
//      which can be found at http://www.gnu.org/licenses/gpl.txt
//
//*****************************************************************************


#ifndef AVRLIBDEFS_H
#define AVRLIBDEFS_H

// Code compatibility to new AVR-libc
// outb(), inb(), inw(), outw(), BV(), sbi(), cbi(), sei(), cli()
#ifndef outb
    #define outb(addr, data)    addr = (data)
#endif
#ifndef inb
    #define inb(addr)           (addr)
#endif
#ifndef outw
    #define outw(addr, data)    addr = (data)
#endif
#ifndef inw
    #define inw(addr)           (addr)
#endif
#ifndef BV
    #define BV(bit)         (1<<(bit))
#endif
#ifndef cbi
    #define cbi(reg,bit)    reg &= ~(BV(bit))
#endif
#ifndef sbi
    #define sbi(reg,bit)    reg |= (BV(bit))
#endif
#ifndef cli
    #define cli()           __asm__ __volatile__ ("cli" ::)
#endif
#ifndef sei
    #define sei()           __asm__ __volatile__ ("sei" ::)
#endif

// support for individual port pin naming in the mega128
// see port128.h for details
#ifdef __AVR_ATmega128__
// not currently necessary due to inclusion
// of these defines in newest AVR-GCC
// do a quick test to see if include is needed
#ifndef PD0
    #include "port128.h"
#endif
#endif

// use this for packed structures
// (this is seldom necessary on an 8-bit architecture like AVR,
//  but can assist in code portability to AVR)
#define GNUC_PACKED __attribute__((packed)) 

// port address helpers
#define DDR(x) ((x)-1)    // address of data direction register of port x
#define PIN(x) ((x)-2)    // address of input register of port x

// MIN/MAX/ABS macros
#define MIN(a,b)            ((a<b)?(a):(b))
#define MAX(a,b)            ((a>b)?(a):(b))
#define ABS(x)              ((x>0)?(x):(-x))

// constants
#define PI      3.14159265359

#endif

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