University of Plymouth - Stages 1, 2 and 3 / Mbed OS Task413-FZ429ZI

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Fork of Task413 by University of Plymouth - Stages 1, 2 and 3

main.cpp@0:87df0368c584, 2015-09-24 (annotated)

Committer:
noutram
Date:
Thu Sep 24 12:28:41 2015 +0000
Revision:
0:87df0368c584
Child:
2:680e5fdd6d4a
Initial version 24-09-2015

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:87df0368c584 1 #include "mbed.h"
noutram 0:87df0368c584 2
noutram 0:87df0368c584 3
noutram 0:87df0368c584 4 #define kRED (1 << 2) //4
noutram 0:87df0368c584 5 #define kYELLOW (1 << 1) //2
noutram 0:87df0368c584 6 #define kGREEN (1 << 0) //1
noutram 0:87df0368c584 7
noutram 0:87df0368c584 8 //Global objects
noutram 0:87df0368c584 9 BusOut binaryOutput(D5, D6, D7); //Outputs as an integer
noutram 0:87df0368c584 10
noutram 0:87df0368c584 11 DigitalIn SW1(D3);
noutram 0:87df0368c584 12 DigitalIn SW2(D4);
noutram 0:87df0368c584 13
noutram 0:87df0368c584 14 AnalogIn AIN(A0);
noutram 0:87df0368c584 15 float fVin = 0.0;
noutram 0:87df0368c584 16
noutram 0:87df0368c584 17 //Main function
noutram 0:87df0368c584 18 int main() {
noutram 0:87df0368c584 19
noutram 0:87df0368c584 20 //This represents which state we are in
noutram 0:87df0368c584 21 //RED or GREEN
noutram 0:87df0368c584 22 int state = 0;
noutram 0:87df0368c584 23
noutram 0:87df0368c584 24 while(1) {
noutram 0:87df0368c584 25
noutram 0:87df0368c584 26 //Read ADC
noutram 0:87df0368c584 27 fVin = AIN;
noutram 0:87df0368c584 28
noutram 0:87df0368c584 29 //Write to terminal
noutram 0:87df0368c584 30 printf("Analog input = %6.4f\n", fVin);
noutram 0:87df0368c584 31
noutram 0:87df0368c584 32 //Now the "state machine" - next state logic
noutram 0:87df0368c584 33 switch (state) {
noutram 0:87df0368c584 34 //The RED state
noutram 0:87df0368c584 35 case 0:
noutram 0:87df0368c584 36 //Condition to switch state
noutram 0:87df0368c584 37 if (fVin > 0.6f) {
noutram 0:87df0368c584 38 state = 1;
noutram 0:87df0368c584 39 }
noutram 0:87df0368c584 40 break;
noutram 0:87df0368c584 41
noutram 0:87df0368c584 42 //The GREEN state
noutram 0:87df0368c584 43 case 1:
noutram 0:87df0368c584 44
noutram 0:87df0368c584 45 //Condition to switch state
noutram 0:87df0368c584 46 if (fVin < 0.4f) {
noutram 0:87df0368c584 47 state = 0;
noutram 0:87df0368c584 48 }
noutram 0:87df0368c584 49 break;
noutram 0:87df0368c584 50
noutram 0:87df0368c584 51 default:
noutram 0:87df0368c584 52 state = 0;
noutram 0:87df0368c584 53 }
noutram 0:87df0368c584 54
noutram 0:87df0368c584 55 //Output logic
noutram 0:87df0368c584 56 switch (state) {
noutram 0:87df0368c584 57 case 0:
noutram 0:87df0368c584 58 binaryOutput = kGREEN;
noutram 0:87df0368c584 59 break;
noutram 0:87df0368c584 60 case 1:
noutram 0:87df0368c584 61 binaryOutput = kRED;
noutram 0:87df0368c584 62 break;
noutram 0:87df0368c584 63 default:
noutram 0:87df0368c584 64 binaryOutput = 0;
noutram 0:87df0368c584 65 }
noutram 0:87df0368c584 66
noutram 0:87df0368c584 67 //Wait
noutram 0:87df0368c584 68 wait(0.1);
noutram 0:87df0368c584 69
noutram 0:87df0368c584 70 } //end while(1)
noutram 0:87df0368c584 71 } //end main