led_driver.h

arm嵌入式系统开发--软件设计与优化随书源代码。开发环境asm+c。小操作系统。

/*
 *  ____________________________________________________________________
 * 
 *  Copyright (c) 2002, Andrew N. Sloss, Chris Wright and Dominic Symes
 *  All rights reserved.
 *  ____________________________________________________________________
 * 
 *  NON-COMMERCIAL USE License
 *  
 *  Redistribution and use in source and binary forms, with or without 
 *  modification, are permitted provided that the following conditions 
 *  are met: 
 *  
 *  1. For NON-COMMERCIAL USE only.
 * 
 *  2. Redistributions of source code must retain the above copyright 
 *     notice, this list of conditions and the following disclaimer. 
 * 
 *  3. Redistributions in binary form must reproduce the above 
 *     copyright notice, this list of conditions and the following 
 *     disclaimer in the documentation and/or other materials provided 
 *     with the distribution. 
 * 
 *  4. All advertising materials mentioning features or use of this 
 *     software must display the following acknowledgement:
 * 
 *     This product includes software developed by Andrew N. Sloss,
 *     Chris Wright and Dominic Symes. 
 * 
 *   THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY 
 *   EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 *   IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 *   PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE CONTRIBUTORS BE 
 *   LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 
 *   OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 *   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 *   OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 
 *   TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
 *   OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 *   OF SUCH DAMAGE. 
 * 
 *  If you have questions about this license or would like a different
 *  license please email :
 * 
 * 	[e-mail]
 * 
 * 
 */
 
/*****************************************************************************
 * Simple Little Operating System - SLOS
 *****************************************************************************/

/*****************************************************************************
 * 
 * Module      : led_driver.h
 * Description : low level LED device driver
 * OS          : SLOS 0.09
 * Platform    : e7t
 * History     : 
 *
 * 19th November 2001 Andrew N. Sloss
 * - Example simple Device driver by Chris Wright's 
 *   specification
 *
 *****************************************************************************/

#ifndef _DEVICE_E7T_LED

#define _DEVICE_E7T_LED  1

#define DEVICE_LED_E7T   55075


#define GREEN1      0
#define RED         2
#define ORANGE      1
#define GREEN2      3

#define ON          1
#define OFF         0

/* -- led_init ----------------------------------------------------------------
 *
 * Description : initalize the LED device driver internal 
 *               data structures and hardware. Set all the
 *               LED's to be zero.
 * 
 * Parameters  : none...
 * Return      : none...
 * Notes       : none...
 *
 */

void led_init(void);

/* -- led_open ----------------------------------------------------------------
 *
 * Description : example open on the LED 
 * 
 * Parameters  : unsigned device = 55075 
 *             : unsigned minor = (0=GREEN1,1=RED,2=ORANGE,3=GREEN2)
 * Return      : UID -
 * Notes       : 
 *
 */

UID led_open(unsigned device,unsigned led);

/* -- led_close ---------------------------------------------------------------
 *
 * Description : example open on the LED 
 * 
 * Parameters  : UID id = 55075 
 * Return      : 
 *   DEVICE_SUCCESS - successfully close the device
 *   DEVICE_UNKNOWN - couldn't identify the UID
 * Notes       : 
 *
 */

int led_close(UID id);

/* -- led_write_bit -----------------------------------------------------------
 *
 * Description : write a particular bit to an LED 
 * 
 * Parameters  : UID id = 55075 + unit (0..3)
 *             : BYTE led_set - least significant bit is used
 * Return      : none...
 *
 * Notes       : an example of a led write bit
 *
 */

void led_write_bit(UID id,BYTE led_set);

/* -- led_read_bit ------------------------------------------------------------
 *
 * Description : read a particular bit value 
 * 
 * Parameters  : UID id = 55075 + unit (0..3)
 * Return      : value return error if 255
 *
 * Notes       : an example of a led read bit
 */

BYTE led_read_bit(UID id);

#endif