Nicholas Outram / Mbed OS Task341

Task 3.4.1

main.cpp@1:bcafc833577d, 2017-07-13 (annotated)

Committer:
noutram
Date:
Thu Jul 13 14:50:03 2017 +0000
Revision:
1:bcafc833577d
Parent:
0:08f1d029d089 
updated for mbed-os 5.5

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:08f1d029d089 1 #include "mbed.h"
noutram 0:08f1d029d089 2
noutram 0:08f1d029d089 3 //Global objects
noutram 0:08f1d029d089 4 BusOut binaryOutput(D5, D6, D7);
noutram 0:08f1d029d089 5 DigitalIn SW1(D4);
noutram 0:08f1d029d089 6
noutram 0:08f1d029d089 7 //Function prototypes
noutram 0:08f1d029d089 8 void waitForButtonPress();
noutram 0:08f1d029d089 9
noutram 0:08f1d029d089 10 //Main function
noutram 0:08f1d029d089 11 int main() {
noutram 0:08f1d029d089 12
noutram 0:08f1d029d089 13 //Create a variable to hold the bit pattern
noutram 0:08f1d029d089 14 unsigned int u;
noutram 0:08f1d029d089 15
noutram 0:08f1d029d089 16 //Flash LED's to indicate the code is running
noutram 0:08f1d029d089 17 binaryOutput = 7;
noutram 0:08f1d029d089 18 wait(0.5);
noutram 0:08f1d029d089 19 binaryOutput = 0;
noutram 0:08f1d029d089 20
noutram 0:08f1d029d089 21 //Main Loop
noutram 0:08f1d029d089 22 while(1) {
noutram 0:08f1d029d089 23
noutram 0:08f1d029d089 24 u = 0; //Set initial value
noutram 0:08f1d029d089 25 binaryOutput = u; //Show binary on LED's
noutram 0:08f1d029d089 26 waitForButtonPress(); //Call function
noutram 0:08f1d029d089 27
noutram 0:08f1d029d089 28 //Here is the first - use | to set bit 1
noutram 0:08f1d029d089 29 u = u | 2; //OR with binary 010
noutram 0:08f1d029d089 30 binaryOutput = u;
noutram 0:08f1d029d089 31 waitForButtonPress();
noutram 0:08f1d029d089 32
noutram 0:08f1d029d089 33 //Modify u with the | to set bit 2
noutram 0:08f1d029d089 34 //WRITE CODE HERE
noutram 0:08f1d029d089 35
noutram 0:08f1d029d089 36 binaryOutput = u;
noutram 0:08f1d029d089 37 waitForButtonPress();
noutram 0:08f1d029d089 38
noutram 0:08f1d029d089 39
noutram 0:08f1d029d089 40 //Modify u with the | to set bit 0
noutram 0:08f1d029d089 41 //WRITE CODE HERE
noutram 0:08f1d029d089 42
noutram 0:08f1d029d089 43 binaryOutput = u;
noutram 0:08f1d029d089 44 waitForButtonPress();
noutram 0:08f1d029d089 45
noutram 0:08f1d029d089 46 } //end while(1)
noutram 0:08f1d029d089 47 } //end main
noutram 0:08f1d029d089 48
noutram 0:08f1d029d089 49 //This is known as a C function.
noutram 0:08f1d029d089 50 //This saves a lot of code repetition
noutram 0:08f1d029d089 51 void waitForButtonPress() {
noutram 0:08f1d029d089 52 while (SW1 == 0);
noutram 0:08f1d029d089 53 wait(0.25);
noutram 0:08f1d029d089 54 while (SW1 == 1);
noutram 0:08f1d029d089 55 }