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 #include "pic24_all.h" 00031 00040 volatile uint8 u8_cFlag = 0; 00041 00042 //Interrupt Service Routine for Change Notification 00043 void _ISRFAST _CNInterrupt (void) { 00044 _CNIF = 0; //clear the change notification interrupt bit 00045 u8_cFlag = 1; 00046 } 00047 00049 inline void CONFIG_SW1() { 00050 CONFIG_RB13_AS_DIG_INPUT(); //use RB13 for switch input 00051 ENABLE_RB13_PULLUP(); //enable the pullup 00052 ENABLE_RB13_CN_INTERRUPT(); //CN13IE = 1 00053 } 00054 00055 int main (void) { 00056 configBasic(HELLO_MSG); 00058 CONFIG_SW1(); //enables individual CN interrupt also 00059 DELAY_US(1); //delay for pullup 00061 _CNIF = 0; //Clear the interrupt flag 00062 _CNIP = 2; //Choose a priority 00063 _CNIE = 1; //enable the Change Notification general interrupt 00064 while (1) { 00065 if (u8_cFlag) { 00066 DELAY_MS(15); //wait for switch bounce to settle 00067 u8_cFlag = 0; 00068 outString("Change notification interrupt occurred\n"); 00069 } 00070 doHeartbeat(); 00071 } 00072 }
1.5.8