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ledtoggle_nofsm.c
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1 /*
2  * "Copyright (c) 2008 Robert B. Reese, Bryan A. Jones, J. W. Bruce ("AUTHORS")"
3  * All rights reserved.
4  * (R. Reese, reese_AT_ece.msstate.edu, Mississippi State University)
5  * (B. A. Jones, bjones_AT_ece.msstate.edu, Mississippi State University)
6  * (J. W. Bruce, jwbruce_AT_ece.msstate.edu, Mississippi State University)
7  *
8  * Permission to use, copy, modify, and distribute this software and its
9  * documentation for any purpose, without fee, and without written agreement is
10  * hereby granted, provided that the above copyright notice, the following
11  * two paragraphs and the authors appear in all copies of this software.
12  *
13  * IN NO EVENT SHALL THE "AUTHORS" BE LIABLE TO ANY PARTY FOR
14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
15  * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE "AUTHORS"
16  * HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
17  *
18  * THE "AUTHORS" SPECIFICALLY DISCLAIMS ANY WARRANTIES,
19  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20  * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21  * ON AN "AS IS" BASIS, AND THE "AUTHORS" HAS NO OBLIGATION TO
22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
23  *
24  * Please maintain this header in its entirety when copying/modifying
25  * these files.
26  *
27  *
28  */
29 
30 #include "pic24_all.h"
31 
32 /** \file
33 A program that toggles an LED whenever a pushbutton switch is pressed
34 and released. Does not use a finite statement approach.
35 */
36 
37 
38 /// LED1
39 #define CONFIG_LED1() CONFIG_RB14_AS_DIG_OUTPUT()
40 #define LED1 _LATB14 //led1 state
41 
42 /// Switch1 configuration
43 inline void CONFIG_SW1() {
44  CONFIG_RB13_AS_DIG_INPUT(); //use RB13 for switch input
45  ENABLE_RB13_PULLUP(); //enable the pullup
46 }
47 #define SW1 _RB13 //switch state
48 #define SW1_PRESSED() (SW1==0) //switch test
49 #define SW1_RELEASED() (SW1==1) //switch test
50 
51 int main (void) {
52  configBasic(HELLO_MSG); // Set up heartbeat, UART, print hello message and diags
53  /** GPIO config ***************************/
54  CONFIG_SW1(); //configure switch
55  CONFIG_LED1(); //configure LED
56  DELAY_US(1); //give pullups a little time
57  LED1 = 0; //LED off initially
58  while (1) {
59  // wait for press
60  while (SW1_RELEASED()) doHeartbeat(); //loop (1)
61  DELAY_MS(15); //debounce
62  // wait for release
63  while (SW1_PRESSED()) doHeartbeat(); //loop (2)
64  DELAY_MS(15); // debounce
65  LED1 = !LED1; //toggle the LED
66  }
67 }