Diff: main.cpp

Revision:

0:3f29ab39579a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Sep 29 02:57:03 2015 +0000
@@ -0,0 +1,38 @@
+/*Lab 1 Program B
+  Lights Random LED every second based on a timer's seed
+  Matthew Sims
+  Section 1001
+*/
+
+#include "Timer.h"
+#include "mbed.h"
+
+DigitalIn s1=p16;
+DigitalOut out[]= {p26,p27,p28,p29,p30};        //Sets up pins
+Timer timer;                                    //Initializes timer object
+
+int main()
+{
+
+    //Timer stopped by user to create a unique number for seed.
+    timer.start();              //starts timer
+    printf("Turn switch 1 on"); //prompt user to turn on switch. Only useful is terraterm is on
+    while(s1!=1) {              //waits for user to turn on switch
+        if(s1==1) {             //When switch 1 is on turned on, the timer stops
+            timer.stop();       //stops the timer
+        }
+    }
+    srand(timer.read_us());     //Sets up rand with a seed based on the timer's value
+
+    int r=-1;
+    int prev=-1;                   
+    while(1) {                  //Infinite loop
+        while(r==prev) {        //generates randoms until it is different from previously on random   
+            r=rand()%5;         //random int 0-4 based on seed
+        }                           
+        out[r]=1;               //Turns on corresponding led
+        wait(1);
+        out[r]=0;
+        prev=r;                //Wait 1 sec before repeating loop
+    }
+}
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