types.h

老外个人做的MP3/优盘。使用ATMEL MEGA系列的MCU

/* ***********************************************************************
**
**  Copyright (C) 2002  Jesper Hansen <[e-mail]> and 
**			Romuald Bialy (MIS) <[e-mail]>.
**
**
**  Yampp-3/USB - types definitions
**
**  File types.h
**
*************************************************************************
**
**   This file is part of the yampp system.
**
**  This program is free software; you can redistribute it and/or
**  modify it under the terms of the GNU General Public License
**  as published by the Free Software Foundation; either version 2
**  of the License, or (at your option) any later version.
**
**  This program is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
**  GNU General Public License for more details.
**
**  You should have received a copy of the GNU General Public License
**  along with this program; if not, write to the Free Software Foundation, 
**  Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
**
*************************************************************************
**
**  Revision History
**
**  when         what  who	why
**
**  2002-09-01   1.0   MIS	initial public release
**
*********************************************************************** */


#ifndef __TYPES_H__
#define __TYPES_H__


#define MAX_U16  65535
#define MAX_S16  32767

#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 

//
// basic unsigned types
//
typedef unsigned char  u08;
typedef unsigned short u16;
typedef unsigned long  u32;

//
// basic signed types
//
typedef char  s08;
typedef short s16;
typedef long  s32;

#ifndef NULL
#define NULL    0
#endif

// Make an unsigned copy of div function
typedef struct {
	unsigned quot;
	unsigned rem;
} udiv_t;
extern udiv_t udiv(unsigned, unsigned) __asm__("__udivmodhi4") __ATTR_CONST__;

// This structures are used to simplify code, compiler doesn't optimize 
// well shifts
struct u16bytes
{
	u08 low, high;
};

union u16convert
{
	u16 value;
	struct u16bytes bytes;
};

struct u32bytes
{
	u08 byte1, byte2, byte3, byte4;
};

struct u32words
{
	u16 low, high;
};

union u32convert 
{
	u32 value;
	struct u32bytes bytes;
	struct u32words words;
};


#endif