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

Task 3.4.3 Solution

Fork of Task343Solution by Nicholas Outram

main.cpp@2:1e53c842f790, 2019-09-18 (annotated)

Committer:
noutram
Date:
Wed Sep 18 12:14:02 2019 +0000
Revision:
2:1e53c842f790
Parent:
0:807cc79e50f0 
2019

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:807cc79e50f0 1 #include "mbed.h"
noutram 0:807cc79e50f0 2
noutram 2:1e53c842f790 3 #ifdef TARGET_NUCLEO_F429ZI
noutram 2:1e53c842f790 4 //#define ONBOARD
noutram 2:1e53c842f790 5 #endif
noutram 2:1e53c842f790 6
noutram 2:1e53c842f790 7 #ifdef ONBOARD
noutram 2:1e53c842f790 8 BusOut binaryOutput(LED1, LED2, LED3);
noutram 2:1e53c842f790 9 DigitalIn SW1(USER_BUTTON);
noutram 2:1e53c842f790 10 #else
noutram 0:807cc79e50f0 11 //Global objects
noutram 0:807cc79e50f0 12 BusOut binaryOutput(D5, D6, D7);
noutram 0:807cc79e50f0 13 DigitalIn SW1(D4);
noutram 2:1e53c842f790 14 #endif
noutram 0:807cc79e50f0 15
noutram 0:807cc79e50f0 16 //Function prototypes
noutram 0:807cc79e50f0 17 void waitForButtonPress();
noutram 0:807cc79e50f0 18
noutram 0:807cc79e50f0 19 //Main function
noutram 0:807cc79e50f0 20 int main() {
noutram 0:807cc79e50f0 21
noutram 0:807cc79e50f0 22 //Create a variable to hold the bit pattern
noutram 0:807cc79e50f0 23 unsigned int u;
noutram 0:807cc79e50f0 24
noutram 0:807cc79e50f0 25 //Flash LED's to indicate the code is running
noutram 0:807cc79e50f0 26 binaryOutput = 7;
noutram 0:807cc79e50f0 27 wait(0.5);
noutram 0:807cc79e50f0 28 binaryOutput = 0;
noutram 0:807cc79e50f0 29
noutram 0:807cc79e50f0 30 while(1) {
noutram 0:807cc79e50f0 31
noutram 0:807cc79e50f0 32 u = 0; //Set initial value 0
noutram 0:807cc79e50f0 33 binaryOutput = u; //Show binary on LED's
noutram 0:807cc79e50f0 34 waitForButtonPress(); //Call function
noutram 0:807cc79e50f0 35
noutram 0:807cc79e50f0 36 //Use & to toggle bit 0
noutram 0:807cc79e50f0 37 u = u ^ 1; //XOR with binary 001
noutram 0:807cc79e50f0 38 binaryOutput = u;
noutram 0:807cc79e50f0 39 waitForButtonPress();
noutram 0:807cc79e50f0 40
noutram 0:807cc79e50f0 41 //Toggle bit 1
noutram 0:807cc79e50f0 42 u = u ^ 2; //XOR with 010
noutram 0:807cc79e50f0 43 binaryOutput = u;
noutram 0:807cc79e50f0 44 waitForButtonPress();
noutram 0:807cc79e50f0 45
noutram 0:807cc79e50f0 46
noutram 0:807cc79e50f0 47 //Toggle bit 2
noutram 0:807cc79e50f0 48 u = u ^ 4; //XOR with 100
noutram 0:807cc79e50f0 49 binaryOutput = u;
noutram 0:807cc79e50f0 50 waitForButtonPress();
noutram 0:807cc79e50f0 51
noutram 0:807cc79e50f0 52 //Toggle bits 0 and 2
noutram 0:807cc79e50f0 53 u = u ^ 5;
noutram 0:807cc79e50f0 54 binaryOutput = u;
noutram 0:807cc79e50f0 55 waitForButtonPress();
noutram 0:807cc79e50f0 56
noutram 0:807cc79e50f0 57 //Toggle all bits
noutram 0:807cc79e50f0 58 u = u ^ 7;
noutram 0:807cc79e50f0 59 binaryOutput = u;
noutram 0:807cc79e50f0 60 waitForButtonPress();
noutram 0:807cc79e50f0 61
noutram 0:807cc79e50f0 62 //Toggle all bits
noutram 0:807cc79e50f0 63 u = u ^ 7;
noutram 0:807cc79e50f0 64 binaryOutput = u;
noutram 0:807cc79e50f0 65 waitForButtonPress();
noutram 0:807cc79e50f0 66
noutram 0:807cc79e50f0 67 } //end while(1)
noutram 0:807cc79e50f0 68 } //end main
noutram 0:807cc79e50f0 69
noutram 0:807cc79e50f0 70
noutram 0:807cc79e50f0 71 void waitForButtonPress() {
noutram 0:807cc79e50f0 72 while (SW1 == 0);
noutram 0:807cc79e50f0 73 wait(0.25);
noutram 0:807cc79e50f0 74 while (SW1 == 1);
noutram 0:807cc79e50f0 75 }