Nicholas Outram / Mbed OS Task341Solution

Task 3.4.1 Solution

main.cpp@1:dbb3a9fe720d, 2017-07-13 (annotated)

Committer:
noutram
Date:
Thu Jul 13 14:50:14 2017 +0000
Revision:
1:dbb3a9fe720d
Parent:
0:9de80b65dfc5 
updated for mbed-os 5.5

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:9de80b65dfc5 1 #include "mbed.h"
noutram 0:9de80b65dfc5 2
noutram 0:9de80b65dfc5 3 //Global objects
noutram 0:9de80b65dfc5 4 BusOut binaryOutput(D5, D6, D7);
noutram 0:9de80b65dfc5 5 DigitalIn SW1(D4);
noutram 0:9de80b65dfc5 6
noutram 0:9de80b65dfc5 7 //Function prototypes
noutram 0:9de80b65dfc5 8 void waitForButtonPress();
noutram 0:9de80b65dfc5 9
noutram 0:9de80b65dfc5 10 //Main function
noutram 0:9de80b65dfc5 11 int main() {
noutram 0:9de80b65dfc5 12
noutram 0:9de80b65dfc5 13 //Create a variable to hold the bit pattern
noutram 0:9de80b65dfc5 14 unsigned int u;
noutram 0:9de80b65dfc5 15
noutram 0:9de80b65dfc5 16 //Flash LED's to indicate the code is running
noutram 0:9de80b65dfc5 17 binaryOutput = 7;
noutram 0:9de80b65dfc5 18 wait(0.5);
noutram 0:9de80b65dfc5 19 binaryOutput = 0;
noutram 0:9de80b65dfc5 20
noutram 0:9de80b65dfc5 21 while(1) {
noutram 0:9de80b65dfc5 22
noutram 0:9de80b65dfc5 23 u = 0; //Set initial value
noutram 0:9de80b65dfc5 24 binaryOutput = u; //Show binary on LED's
noutram 0:9de80b65dfc5 25 waitForButtonPress(); //Call function
noutram 0:9de80b65dfc5 26
noutram 0:9de80b65dfc5 27 //Here is the first - use | to set bit 1
noutram 0:9de80b65dfc5 28 u = u | 2; //OR with binary 010
noutram 0:9de80b65dfc5 29 binaryOutput = u;
noutram 0:9de80b65dfc5 30 waitForButtonPress();
noutram 0:9de80b65dfc5 31
noutram 0:9de80b65dfc5 32 //Modify u with the | to set bit 2 to a 1
noutram 0:9de80b65dfc5 33 u = u | 4;
noutram 0:9de80b65dfc5 34 binaryOutput = u;
noutram 0:9de80b65dfc5 35 waitForButtonPress();
noutram 0:9de80b65dfc5 36
noutram 0:9de80b65dfc5 37
noutram 0:9de80b65dfc5 38 //Modify u with the | to set bit 0 to a 1
noutram 0:9de80b65dfc5 39 u = u | 1;
noutram 0:9de80b65dfc5 40 binaryOutput = u;
noutram 0:9de80b65dfc5 41 waitForButtonPress();
noutram 0:9de80b65dfc5 42
noutram 0:9de80b65dfc5 43 } //end while(1)
noutram 0:9de80b65dfc5 44 } //end main
noutram 0:9de80b65dfc5 45
noutram 0:9de80b65dfc5 46
noutram 0:9de80b65dfc5 47 void waitForButtonPress() {
noutram 0:9de80b65dfc5 48 while (SW1 == 0);
noutram 0:9de80b65dfc5 49 wait(0.25);
noutram 0:9de80b65dfc5 50 while (SW1 == 1);
noutram 0:9de80b65dfc5 51 }