University of Plymouth - Stages 1, 2 and 3 / Mbed OS Task343Solution

Task 3.4.3 Solution

Fork of Task343Solution by Nicholas Outram

main.cpp@0:807cc79e50f0, 2015-09-24 (annotated)

Committer:
noutram
Date:
Thu Sep 24 12:27:10 2015 +0000
Revision:
0:807cc79e50f0
Child:
2:1e53c842f790
Initial version 24-09-2015

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:807cc79e50f0 1 #include "mbed.h"
noutram 0:807cc79e50f0 2
noutram 0:807cc79e50f0 3 //Global objects
noutram 0:807cc79e50f0 4 BusOut binaryOutput(D5, D6, D7);
noutram 0:807cc79e50f0 5 DigitalIn SW1(D4);
noutram 0:807cc79e50f0 6
noutram 0:807cc79e50f0 7 //Function prototypes
noutram 0:807cc79e50f0 8 void waitForButtonPress();
noutram 0:807cc79e50f0 9
noutram 0:807cc79e50f0 10 //Main function
noutram 0:807cc79e50f0 11 int main() {
noutram 0:807cc79e50f0 12
noutram 0:807cc79e50f0 13 //Create a variable to hold the bit pattern
noutram 0:807cc79e50f0 14 unsigned int u;
noutram 0:807cc79e50f0 15
noutram 0:807cc79e50f0 16 //Flash LED's to indicate the code is running
noutram 0:807cc79e50f0 17 binaryOutput = 7;
noutram 0:807cc79e50f0 18 wait(0.5);
noutram 0:807cc79e50f0 19 binaryOutput = 0;
noutram 0:807cc79e50f0 20
noutram 0:807cc79e50f0 21 while(1) {
noutram 0:807cc79e50f0 22
noutram 0:807cc79e50f0 23 u = 0; //Set initial value 0
noutram 0:807cc79e50f0 24 binaryOutput = u; //Show binary on LED's
noutram 0:807cc79e50f0 25 waitForButtonPress(); //Call function
noutram 0:807cc79e50f0 26
noutram 0:807cc79e50f0 27 //Use & to toggle bit 0
noutram 0:807cc79e50f0 28 u = u ^ 1; //XOR with binary 001
noutram 0:807cc79e50f0 29 binaryOutput = u;
noutram 0:807cc79e50f0 30 waitForButtonPress();
noutram 0:807cc79e50f0 31
noutram 0:807cc79e50f0 32 //Toggle bit 1
noutram 0:807cc79e50f0 33 u = u ^ 2; //XOR with 010
noutram 0:807cc79e50f0 34 binaryOutput = u;
noutram 0:807cc79e50f0 35 waitForButtonPress();
noutram 0:807cc79e50f0 36
noutram 0:807cc79e50f0 37
noutram 0:807cc79e50f0 38 //Toggle bit 2
noutram 0:807cc79e50f0 39 u = u ^ 4; //XOR with 100
noutram 0:807cc79e50f0 40 binaryOutput = u;
noutram 0:807cc79e50f0 41 waitForButtonPress();
noutram 0:807cc79e50f0 42
noutram 0:807cc79e50f0 43 //Toggle bits 0 and 2
noutram 0:807cc79e50f0 44 u = u ^ 5;
noutram 0:807cc79e50f0 45 binaryOutput = u;
noutram 0:807cc79e50f0 46 waitForButtonPress();
noutram 0:807cc79e50f0 47
noutram 0:807cc79e50f0 48 //Toggle all bits
noutram 0:807cc79e50f0 49 u = u ^ 7;
noutram 0:807cc79e50f0 50 binaryOutput = u;
noutram 0:807cc79e50f0 51 waitForButtonPress();
noutram 0:807cc79e50f0 52
noutram 0:807cc79e50f0 53 //Toggle all bits
noutram 0:807cc79e50f0 54 u = u ^ 7;
noutram 0:807cc79e50f0 55 binaryOutput = u;
noutram 0:807cc79e50f0 56 waitForButtonPress();
noutram 0:807cc79e50f0 57
noutram 0:807cc79e50f0 58 } //end while(1)
noutram 0:807cc79e50f0 59 } //end main
noutram 0:807cc79e50f0 60
noutram 0:807cc79e50f0 61
noutram 0:807cc79e50f0 62 void waitForButtonPress() {
noutram 0:807cc79e50f0 63 while (SW1 == 0);
noutram 0:807cc79e50f0 64 wait(0.25);
noutram 0:807cc79e50f0 65 while (SW1 == 1);
noutram 0:807cc79e50f0 66 }