Nicholas Outram / Mbed OS Task431Solution

Task 4.3.1 Solution

main.cpp@1:1fd1b4a299eb, 2017-07-13 (annotated)

Committer:
noutram
Date:
Thu Jul 13 14:53:48 2017 +0000
Revision:
1:1fd1b4a299eb
Parent:
0:8f4002068b49 
updated for mbed-os 5.5

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:8f4002068b49 1 #include "mbed.h"
noutram 0:8f4002068b49 2
noutram 0:8f4002068b49 3 //Global objects
noutram 0:8f4002068b49 4 BusOut binaryOutput(D5, D6, D7);
noutram 0:8f4002068b49 5 AnalogIn POT_ADC_In(A0);
noutram 0:8f4002068b49 6 AnalogIn LDD_ADC_In(A1);
noutram 0:8f4002068b49 7
noutram 0:8f4002068b49 8 float fPOT, fLDR = 0.0;
noutram 0:8f4002068b49 9 float fPOTAverage = 0.0, fLDRAverage = 0.0;
noutram 0:8f4002068b49 10 unsigned int n = 0;
noutram 0:8f4002068b49 11 unsigned int N = 10;
noutram 0:8f4002068b49 12
noutram 0:8f4002068b49 13 //Main function
noutram 0:8f4002068b49 14 int main() {
noutram 0:8f4002068b49 15
noutram 0:8f4002068b49 16 while(1) {
noutram 0:8f4002068b49 17
noutram 0:8f4002068b49 18 //Read ADC
noutram 0:8f4002068b49 19 fPOT = POT_ADC_In;
noutram 0:8f4002068b49 20 fLDR = LDD_ADC_In;
noutram 0:8f4002068b49 21
noutram 0:8f4002068b49 22 //Calculate the average of both fPOT and fLDR
noutram 0:8f4002068b49 23 fPOTAverage += fPOT;
noutram 0:8f4002068b49 24 fLDRAverage += fLDR;
noutram 0:8f4002068b49 25
noutram 0:8f4002068b49 26 //Update the sample count
noutram 0:8f4002068b49 27 n++;
noutram 0:8f4002068b49 28
noutram 0:8f4002068b49 29 //Wait
noutram 0:8f4002068b49 30 wait(0.01);
noutram 0:8f4002068b49 31
noutram 0:8f4002068b49 32 //Do we have N samples?
noutram 0:8f4002068b49 33 if (n == N) {
noutram 0:8f4002068b49 34
noutram 0:8f4002068b49 35 //Calculate average
noutram 0:8f4002068b49 36 fPOTAverage /= (float)N;
noutram 0:8f4002068b49 37 fLDRAverage /= (float)N;
noutram 0:8f4002068b49 38
noutram 0:8f4002068b49 39 //Write to terminal
noutram 0:8f4002068b49 40 printf("POT = %6.4f\tLDR = %6.4f\n", fPOTAverage, fLDRAverage);
noutram 0:8f4002068b49 41
noutram 0:8f4002068b49 42 //Check the threshold
noutram 0:8f4002068b49 43 if (fLDRAverage > fPOTAverage) {
noutram 0:8f4002068b49 44 binaryOutput = 0; //Binary 000
noutram 0:8f4002068b49 45 } else {
noutram 0:8f4002068b49 46 binaryOutput = 7; //Binary 111
noutram 0:8f4002068b49 47 }
noutram 0:8f4002068b49 48
noutram 0:8f4002068b49 49 //RESET averages and sample count
noutram 0:8f4002068b49 50 n = 0;
noutram 0:8f4002068b49 51 fPOTAverage = 0.0;
noutram 0:8f4002068b49 52 fLDRAverage = 0.0;
noutram 0:8f4002068b49 53 }
noutram 0:8f4002068b49 54
noutram 0:8f4002068b49 55
noutram 0:8f4002068b49 56 } //end while(1)
noutram 0:8f4002068b49 57 } //end main