timer0_pwm.h

基于Atmel ATMega88+ATA682的应用实例 主要功能包括： 1) PWM输出控制 2) H-Bridge,4 POWER FET 驱动 3) 模拟量比较

/*
**
****************************************************************************
**
**
**             Copyright (c) 2007 - Atmel Corporation
**             Proprietaty Information
**
** Project    	: ATMEGA88 + ATA6824 High Temperature H-bridge System
** Module     	: Timer0_PWM.h
** Description	: High temperature DC motor control
**                PWM output compare OC0B pluged on ATA6824 PWM input command
**
** Version :     Date:         Author:      Comment:
**    1.0        26.01.2007    F.G.          Creation 
**
** LICENSE -
**
** ATMEL - 2007
** All software programs are provided 'as is' without warranty of any kind:
** Atmel does not state the suitability of the provided materials for any
** purpose. Atmel hereby disclaim all warranties and conditions with regard
** to the provided software, including all implied warranties, fitness for
** a particular purpose, title and non-infringement.In no event will Atmel
** be liable for any indirect or consequential damages or any damages
** whatsoever resulting from the usage of the software program.
****************************************************************************
**
*/

#ifndef _TIMER0_PWM_H
#define _TIMER0_PWM_H
/*_____ I N C L U D E S ____________________________________________________*/

/*_____ M A C R O S ________________________________________________________*/

#define TIMER0_SET_OC0B_PWM(val)          (OCR0B = val)

/*_____ D E F I N I T I O N S ______________________________________________*/

//! SoftTimer_t Used as a time based for general purpose non-critical use (like LED toggle) 
typedef struct{
  U16 count :15;      //!< 15 bit counter
  U16 ovf   :1;       //!< 1 overflow flag
}SoftTimer_t;
                
#define WD_TIME_TRIG  320     // 320 * 32祍 --> 10.24ms, half of the WD refresh period. 
                              // A 51 Kohms resistor is pluged to the ATA6824 Rwd pin
                              // Which lead to a typical 25ms Twd (see ATA6824 datasheet