main.cpp

00001 /* * * * * * * * * * * * * * * * * * * * * * * * * * *
00002  * This detects a winner in a two person race by     *
00003  * detecting when there is a break in the signal     *
00004  * sent to two different pins.  When the winner is   *
00005  * detected, the corresponding LED is lit.           *
00006  *                                                   *
00007  * Created by: Michael Dushkoff (mad1841@rit.edu)    *
00008  * * * * * * * * * * * * * * * * * * * * * * * * * * */
00009 #include "mbed.h"
00010 
00011 /* This is a print button that allows the time to be outputted */
00012 DigitalIn button(p30);
00013 
00014 /* Tells when to stop the timer */
00015 int end1 = 0;
00016 int end2 = 0;
00017 
00018 /* Rise detection */
00019 int rise = 0;
00020 
00021 /* Create two individual timers */
00022 Timer t1;
00023 Timer t2;
00024 
00025 /* Recieving pin */
00026 InterruptIn rxo(p10);
00027 
00028 /* Interrupt sensors */
00029 InterruptIn sEnd1(p20);
00030 InterruptIn sEnd2(p21);
00031 
00032 /* Indicator LEDs */
00033 DigitalOut iled1(p22);
00034 DigitalOut iled2(p23);
00035 
00036 /* Status LEDs */
00037 DigitalOut sled1(LED1);
00038 DigitalOut sled2(LED2);
00039 DigitalOut sled3(LED3);
00040 DigitalOut sled4(LED4);
00041 
00042 /* Winner LEDs */
00043 DigitalOut wled11(p11);  // Gate 1 Win
00044 DigitalOut wled12(p12);  // Gate 1 Win
00045 DigitalOut wled13(p13);  // Gate 1 Win
00046 DigitalOut wled21(p36);  // Gate 2 Win
00047 DigitalOut wled22(p35);  // Gate 2 Win
00048 DigitalOut wled23(p34);  // Gate 2 Win
00049 
00050 /* Tells when there is a winner */
00051 int win = 0;
00052 
00053 /* Pulsed recieving */
00054 int rxc = 0;
00055 
00056 /* This detects a transmitted signal */
00057 void recieve(){
00058     if (rxc >= 1){
00059         /* Set status LEDs */
00060         sled2 = 1;
00061         sled3 = 1;
00062         
00063         /* Start timers */
00064         t1.start();
00065         t2.start();
00066     }
00067     rxc += 1;
00068 }
00069 
00070 /* This detects interrupt 1 */
00071 void l1(){
00072     if (win == 0){
00073         iled1 = 1;
00074         win = 1;
00075         wled11 = 1;
00076         wled12 = 1;
00077         wled13 = 1;
00078     }
00079     end1 = 1;
00080     sled1 = 1;  // Set status LED
00081     t1.stop();  // Stop timer 1
00082 }
00083 
00084 /* This detects interrupt 2 */
00085 void l2(){
00086     if (win == 0){
00087         iled2 = 1;
00088         win = 1;
00089         wled21 = 1;
00090         wled22 = 1;
00091         wled23 = 1;
00092     }
00093     end2 = 1;
00094     sled4 = 1;  // Set status LED
00095     t2.stop();  // Stop timer 2
00096 }
00097 
00098 int main() {
00099     /* Set the LEDs off */
00100     iled1 = 0;
00101     iled2 = 0;
00102     sled1 = 0;
00103     sled2 = 0;
00104     sled3 = 0;
00105     sled4 = 0;
00106     wled11 = 0;
00107     wled12 = 0;
00108     wled13 = 0;
00109     wled21 = 0;
00110     wled22 = 0;
00111     wled23 = 0;
00112     
00113     /* Attach interrupt service routine to pins */
00114     sEnd1.fall(&l1);
00115     sEnd2.fall(&l2);
00116     rxo.rise(&recieve);
00117     
00118     printf("Ready!\n\r");
00119     while(1) {
00120         if (button.read() == 1 && rise == 0){
00121             /* Set rise detector to high */
00122             rise = 1;
00123             
00124             /* Check Track 1 */
00125             if (end1 == 1){
00126                 printf("========== Track 1 Time ==========\n\r");
00127                 printf(" Finished in: %lf seconds\n\r", t1.read());
00128                 printf("==================================\n\r\n\r"); 
00129             }
00130             else {
00131                 printf("Track 1 has not finished\n\r\n\r");   
00132             }
00133             
00134             /* Check Track 2 */
00135             if (end2 == 1){
00136                 printf("========== Track 2 Time ==========\n\r");
00137                 printf(" Finished in: %lf seconds\n\r", t2.read());
00138                 printf("==================================\n\r\n\r"); 
00139             }
00140             else {
00141                 printf("Track 2 has not finished\n\r\n\r");   
00142             }
00143         }
00144         else if (button.read() == 0 && rise == 1){
00145             /* Reset rise detection */
00146             rise = 2;
00147             wait (0.001); //Debounce
00148         }
00149         else if (button.read() == 0 && rise == 2){
00150             rise = 0;
00151         }
00152     }
00153 }