Matthew Sims / Lab1B

Lab 1 Program B

Dependencies:   mbed

main.cpp@0:3f29ab39579a, 2015-09-29 (annotated)

Committer:
mattsims12
Date:
Tue Sep 29 02:57:03 2015 +0000
Revision:
0:3f29ab39579a
Lab 1 Program B

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mattsims12 0:3f29ab39579a 1 /*Lab 1 Program B
mattsims12 0:3f29ab39579a 2 Lights Random LED every second based on a timer's seed
mattsims12 0:3f29ab39579a 3 Matthew Sims
mattsims12 0:3f29ab39579a 4 Section 1001
mattsims12 0:3f29ab39579a 5 */
mattsims12 0:3f29ab39579a 6
mattsims12 0:3f29ab39579a 7 #include "Timer.h"
mattsims12 0:3f29ab39579a 8 #include "mbed.h"
mattsims12 0:3f29ab39579a 9
mattsims12 0:3f29ab39579a 10 DigitalIn s1=p16;
mattsims12 0:3f29ab39579a 11 DigitalOut out[]= {p26,p27,p28,p29,p30}; //Sets up pins
mattsims12 0:3f29ab39579a 12 Timer timer; //Initializes timer object
mattsims12 0:3f29ab39579a 13
mattsims12 0:3f29ab39579a 14 int main()
mattsims12 0:3f29ab39579a 15 {
mattsims12 0:3f29ab39579a 16
mattsims12 0:3f29ab39579a 17 //Timer stopped by user to create a unique number for seed.
mattsims12 0:3f29ab39579a 18 timer.start(); //starts timer
mattsims12 0:3f29ab39579a 19 printf("Turn switch 1 on"); //prompt user to turn on switch. Only useful is terraterm is on
mattsims12 0:3f29ab39579a 20 while(s1!=1) { //waits for user to turn on switch
mattsims12 0:3f29ab39579a 21 if(s1==1) { //When switch 1 is on turned on, the timer stops
mattsims12 0:3f29ab39579a 22 timer.stop(); //stops the timer
mattsims12 0:3f29ab39579a 23 }
mattsims12 0:3f29ab39579a 24 }
mattsims12 0:3f29ab39579a 25 srand(timer.read_us()); //Sets up rand with a seed based on the timer's value
mattsims12 0:3f29ab39579a 26
mattsims12 0:3f29ab39579a 27 int r=-1;
mattsims12 0:3f29ab39579a 28 int prev=-1;
mattsims12 0:3f29ab39579a 29 while(1) { //Infinite loop
mattsims12 0:3f29ab39579a 30 while(r==prev) { //generates randoms until it is different from previously on random
mattsims12 0:3f29ab39579a 31 r=rand()%5; //random int 0-4 based on seed
mattsims12 0:3f29ab39579a 32 }
mattsims12 0:3f29ab39579a 33 out[r]=1; //Turns on corresponding led
mattsims12 0:3f29ab39579a 34 wait(1);
mattsims12 0:3f29ab39579a 35 out[r]=0;
mattsims12 0:3f29ab39579a 36 prev=r; //Wait 1 sec before repeating loop
mattsims12 0:3f29ab39579a 37 }
mattsims12 0:3f29ab39579a 38 }