University of Plymouth - Stages 1, 2 and 3 / Mbed OS Task341

Task 3.4.1

Fork of Task341 by Nicholas Outram

main.cpp@2:bea5a01bd4d8, 2019-09-18 (annotated)

Committer:
noutram
Date:
Wed Sep 18 12:01:28 2019 +0000
Revision:
2:bea5a01bd4d8
Parent:
0:08f1d029d089 
2019

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:08f1d029d089 1 #include "mbed.h"
noutram 0:08f1d029d089 2
noutram 2:bea5a01bd4d8 3 #ifdef TARGET_NUCLEO_F429ZI
noutram 2:bea5a01bd4d8 4 //#define ONBOARD
noutram 2:bea5a01bd4d8 5 #endif
noutram 2:bea5a01bd4d8 6
noutram 2:bea5a01bd4d8 7 #ifdef ONBOARD
noutram 2:bea5a01bd4d8 8 BusOut binaryOutput(LED1, LED2, LED3);
noutram 2:bea5a01bd4d8 9 DigitalIn SW1(USER_BUTTON);
noutram 2:bea5a01bd4d8 10 #else
noutram 2:bea5a01bd4d8 11 //lsb first
noutram 0:08f1d029d089 12 //Global objects
noutram 0:08f1d029d089 13 BusOut binaryOutput(D5, D6, D7);
noutram 0:08f1d029d089 14 DigitalIn SW1(D4);
noutram 2:bea5a01bd4d8 15 #endif
noutram 2:bea5a01bd4d8 16
noutram 0:08f1d029d089 17
noutram 0:08f1d029d089 18 //Function prototypes
noutram 0:08f1d029d089 19 void waitForButtonPress();
noutram 0:08f1d029d089 20
noutram 0:08f1d029d089 21 //Main function
noutram 0:08f1d029d089 22 int main() {
noutram 0:08f1d029d089 23
noutram 0:08f1d029d089 24 //Create a variable to hold the bit pattern
noutram 0:08f1d029d089 25 unsigned int u;
noutram 0:08f1d029d089 26
noutram 0:08f1d029d089 27 //Flash LED's to indicate the code is running
noutram 0:08f1d029d089 28 binaryOutput = 7;
noutram 0:08f1d029d089 29 wait(0.5);
noutram 0:08f1d029d089 30 binaryOutput = 0;
noutram 0:08f1d029d089 31
noutram 0:08f1d029d089 32 //Main Loop
noutram 0:08f1d029d089 33 while(1) {
noutram 0:08f1d029d089 34
noutram 0:08f1d029d089 35 u = 0; //Set initial value
noutram 0:08f1d029d089 36 binaryOutput = u; //Show binary on LED's
noutram 0:08f1d029d089 37 waitForButtonPress(); //Call function
noutram 0:08f1d029d089 38
noutram 0:08f1d029d089 39 //Here is the first - use | to set bit 1
noutram 0:08f1d029d089 40 u = u | 2; //OR with binary 010
noutram 0:08f1d029d089 41 binaryOutput = u;
noutram 0:08f1d029d089 42 waitForButtonPress();
noutram 0:08f1d029d089 43
noutram 0:08f1d029d089 44 //Modify u with the | to set bit 2
noutram 0:08f1d029d089 45 //WRITE CODE HERE
noutram 0:08f1d029d089 46
noutram 0:08f1d029d089 47 binaryOutput = u;
noutram 0:08f1d029d089 48 waitForButtonPress();
noutram 0:08f1d029d089 49
noutram 0:08f1d029d089 50
noutram 0:08f1d029d089 51 //Modify u with the | to set bit 0
noutram 0:08f1d029d089 52 //WRITE CODE HERE
noutram 0:08f1d029d089 53
noutram 0:08f1d029d089 54 binaryOutput = u;
noutram 0:08f1d029d089 55 waitForButtonPress();
noutram 0:08f1d029d089 56
noutram 0:08f1d029d089 57 } //end while(1)
noutram 0:08f1d029d089 58 } //end main
noutram 0:08f1d029d089 59
noutram 0:08f1d029d089 60 //This is known as a C function.
noutram 0:08f1d029d089 61 //This saves a lot of code repetition
noutram 0:08f1d029d089 62 void waitForButtonPress() {
noutram 0:08f1d029d089 63 while (SW1 == 0);
noutram 0:08f1d029d089 64 wait(0.25);
noutram 0:08f1d029d089 65 while (SW1 == 1);
noutram 0:08f1d029d089 66 }