University of Plymouth - Stages 1, 2 and 3 / Mbed OS Task342Solution

Task 4.3.2 Solution

Fork of Task342Solution by Nicholas Outram

main.cpp@2:717364fdf071, 2019-09-18 (annotated)

Committer:
noutram
Date:
Wed Sep 18 12:09:27 2019 +0000
Revision:
2:717364fdf071
Parent:
0:cdb59b84bd58 
2019

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:cdb59b84bd58 1 #include "mbed.h"
noutram 0:cdb59b84bd58 2
noutram 2:717364fdf071 3 #ifdef TARGET_NUCLEO_F429ZI
noutram 2:717364fdf071 4 //#define ONBOARD
noutram 2:717364fdf071 5 #endif
noutram 2:717364fdf071 6
noutram 2:717364fdf071 7 #ifdef ONBOARD
noutram 2:717364fdf071 8 BusOut binaryOutput(LED1, LED2, LED3);
noutram 2:717364fdf071 9 DigitalIn SW1(USER_BUTTON);
noutram 2:717364fdf071 10 #else
noutram 0:cdb59b84bd58 11 //Global objects
noutram 0:cdb59b84bd58 12 BusOut binaryOutput(D5, D6, D7);
noutram 0:cdb59b84bd58 13 DigitalIn SW1(D4);
noutram 2:717364fdf071 14 #endif
noutram 0:cdb59b84bd58 15
noutram 0:cdb59b84bd58 16 //Function prototypes
noutram 0:cdb59b84bd58 17 void waitForButtonPress();
noutram 0:cdb59b84bd58 18
noutram 0:cdb59b84bd58 19 //Main function
noutram 0:cdb59b84bd58 20 int main() {
noutram 0:cdb59b84bd58 21
noutram 0:cdb59b84bd58 22 //Create a variable to hold the bit pattern
noutram 0:cdb59b84bd58 23 unsigned int u;
noutram 0:cdb59b84bd58 24
noutram 0:cdb59b84bd58 25 //Flash LED's to indicate the code is running
noutram 0:cdb59b84bd58 26 binaryOutput = 7;
noutram 0:cdb59b84bd58 27 wait(0.5);
noutram 0:cdb59b84bd58 28 binaryOutput = 0;
noutram 0:cdb59b84bd58 29
noutram 0:cdb59b84bd58 30 while(1) {
noutram 0:cdb59b84bd58 31
noutram 0:cdb59b84bd58 32 u = 7; //Set initial value 111
noutram 0:cdb59b84bd58 33 binaryOutput = u; //Show binary on LED's
noutram 0:cdb59b84bd58 34 waitForButtonPress(); //Call function
noutram 0:cdb59b84bd58 35
noutram 0:cdb59b84bd58 36 //Use & to reset bit 1
noutram 0:cdb59b84bd58 37 u = u & 5; //AND with binary 101
noutram 0:cdb59b84bd58 38 binaryOutput = u;
noutram 0:cdb59b84bd58 39 waitForButtonPress();
noutram 0:cdb59b84bd58 40
noutram 0:cdb59b84bd58 41 //Modify u with & to reset bit 2 to a 0
noutram 0:cdb59b84bd58 42 u = u & 3; //AND with 011
noutram 0:cdb59b84bd58 43 binaryOutput = u;
noutram 0:cdb59b84bd58 44 waitForButtonPress();
noutram 0:cdb59b84bd58 45
noutram 0:cdb59b84bd58 46
noutram 0:cdb59b84bd58 47 //Modify u with & to reset bit 0 to a 0
noutram 0:cdb59b84bd58 48 u = u & 6; //AND with 110
noutram 0:cdb59b84bd58 49 binaryOutput = u;
noutram 0:cdb59b84bd58 50 waitForButtonPress();
noutram 0:cdb59b84bd58 51
noutram 0:cdb59b84bd58 52 } //end while(1)
noutram 0:cdb59b84bd58 53 } //end main
noutram 0:cdb59b84bd58 54
noutram 0:cdb59b84bd58 55
noutram 0:cdb59b84bd58 56 void waitForButtonPress() {
noutram 0:cdb59b84bd58 57 while (SW1 == 0);
noutram 0:cdb59b84bd58 58 wait(0.25);
noutram 0:cdb59b84bd58 59 while (SW1 == 1);
noutram 0:cdb59b84bd58 60 }