clock.comp

无线传感器网络操作系统源代码

/*									tab:4
 *
 *
 * "Copyright (c) 2000 and The Regents of the University 
 * of California.  All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 * 
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
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 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Authors:		Jason Hill
 * 
 * Will provide periodic clock events.  It is initialized with the number
 * of ticks per event and the scale of the ticks.
 * 
 * If it is initialized with a sclae of zero, the clock stops ticking.
 *
 * Here is the breakdown of tick spacing for the various scales:
 *
 * 0 - off
 * 1 - 32768 ticks/second
 * 2 - 4096 ticks/second
 * 3 - 1024 ticks/second
 * 4 - 512 ticks/second
 * 5 - 256 ticks/second
 * 6 - 128 ticks/second
 * 7 - 32 ticks/second
 *
 */

TOS_MODULE CLOCK;

ACCEPTS{
	char CLOCK_INIT(char interval, char scale);
	char CLOCK_GET_TIME(short *time);
	char CLOCK_SET_TIME(short time);
};

SIGNALS{
	void CLOCK_FIRE_EVENT(void);
};