pic24_delay.h

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00001 /*
00002  * "Copyright (c) 2008 Robert B. Reese, Bryan A. Jones, J. W. Bruce ("AUTHORS")"
00003  * All rights reserved.
00004  * (R. Reese, reese_AT_ece.msstate.edu, Mississippi State University)
00005  * (B. A. Jones, bjones_AT_ece.msstate.edu, Mississippi State University)
00006  * (J. W. Bruce, jwbruce_AT_ece.msstate.edu, Mississippi State University)
00007  *
00008  * Permission to use, copy, modify, and distribute this software and its
00009  * documentation for any purpose, without fee, and without written agreement is
00010  * hereby granted, provided that the above copyright notice, the following
00011  * two paragraphs and the authors appear in all copies of this software.
00012  *
00013  * IN NO EVENT SHALL THE "AUTHORS" BE LIABLE TO ANY PARTY FOR
00014  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
00015  * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE "AUTHORS"
00016  * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00017  *
00018  * THE "AUTHORS" SPECIFICALLY DISCLAIMS ANY WARRANTIES,
00019  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
00020  * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
00021  * ON AN "AS IS" BASIS, AND THE "AUTHORS" HAS NO OBLIGATION TO
00022  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
00023  *
00024  * Please maintain this header in its entirety when copying/modifying
00025  * these files.
00026  *
00027  *
00028  */
00029 
00030 // Documentation for this file. If the \file tag isn't present,
00031 // this file won't be documented.
00038 #ifndef _PIC24_DELAY_H_
00039 #define _PIC24_DELAY_H_
00040 
00044 #ifndef DEBOUNCE_DLY
00045 #define DEBOUNCE_DLY  15   //in milliseconds
00046 #endif
00047 
00052 #define CYCLES_PER_MS ((uint32)(FCY * 0.001))
00053 
00058 #define CYCLES_PER_US ((uint32)(FCY * 0.000001))
00059 
00060 #include "pic24_util.h"  // Need u32_heartbeatCount
00061 #include <libpic30.h>    // Has __delay32
00062 
00072 inline static void delayAndUpdateHeartbeatCount(uint32 u32_cyc) {
00073   __delay32(u32_cyc);
00074 #if USE_HEARTBEAT
00075   u32_heartbeatCount += (u32_cyc >> 4);
00076 #endif
00077 }
00078 
00079 
00088 #define DELAY_MS(ms)  delayAndUpdateHeartbeatCount(CYCLES_PER_MS * ((uint32) ms));
00089 
00094 #define DELAY_US(us)  delayAndUpdateHeartbeatCount(CYCLES_PER_US * ((uint32) us));
00095 
00096 
00097 #endif

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