Nicholas Outram / Mbed OS Task434

Task 4.3.4

main.cpp@1:05a6ace4de93, 2017-07-13 (annotated)

Committer:
noutram
Date:
Thu Jul 13 14:54:08 2017 +0000
Revision:
1:05a6ace4de93
Parent:
0:5f63e9ea5a3a 
updated for mbed-os 5.5

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:5f63e9ea5a3a 1 #include "mbed.h"
noutram 0:5f63e9ea5a3a 2
noutram 0:5f63e9ea5a3a 3 //Constants
noutram 0:5f63e9ea5a3a 4 #define N 10
noutram 0:5f63e9ea5a3a 5
noutram 0:5f63e9ea5a3a 6 //Function Prototype
noutram 0:5f63e9ea5a3a 7 float updateAverage(float newSample, float buffer[]);
noutram 0:5f63e9ea5a3a 8
noutram 0:5f63e9ea5a3a 9 //Global objects
noutram 0:5f63e9ea5a3a 10 Serial pc(USBTX, USBRX);
noutram 0:5f63e9ea5a3a 11
noutram 0:5f63e9ea5a3a 12 BusOut binaryOutput(D5, D6, D7);
noutram 0:5f63e9ea5a3a 13 AnalogIn POT_ADC_In(A0);
noutram 0:5f63e9ea5a3a 14 AnalogIn LDR_ADC_In(A1);
noutram 0:5f63e9ea5a3a 15
noutram 0:5f63e9ea5a3a 16 float xPOT[N]; //Aray of potentiometer samples
noutram 0:5f63e9ea5a3a 17 float xLDR[N]; //Aray of LDR samples
noutram 0:5f63e9ea5a3a 18
noutram 0:5f63e9ea5a3a 19 //Main function
noutram 0:5f63e9ea5a3a 20 int main()
noutram 0:5f63e9ea5a3a 21 {
noutram 0:5f63e9ea5a3a 22
noutram 0:5f63e9ea5a3a 23 //Set baud rate to 115200
noutram 0:5f63e9ea5a3a 24 pc.baud(115200);
noutram 0:5f63e9ea5a3a 25
noutram 0:5f63e9ea5a3a 26 //Print header
noutram 0:5f63e9ea5a3a 27 pc.printf("POT,LDR,avPOT, acLDR\n\n");
noutram 0:5f63e9ea5a3a 28
noutram 0:5f63e9ea5a3a 29 while(1) {
noutram 0:5f63e9ea5a3a 30
noutram 0:5f63e9ea5a3a 31 //Move the samples in both arrays to the right
noutram 0:5f63e9ea5a3a 32 for (unsigned int n=(N-1); n>0; n--) {
noutram 0:5f63e9ea5a3a 33 xPOT[n] = xPOT[n-1];
noutram 0:5f63e9ea5a3a 34 xLDR[n] = xLDR[n-1];
noutram 0:5f63e9ea5a3a 35 }
noutram 0:5f63e9ea5a3a 36
noutram 0:5f63e9ea5a3a 37 //Insert the new sample at position 0
noutram 0:5f63e9ea5a3a 38 xPOT[0] = POT_ADC_In;
noutram 0:5f63e9ea5a3a 39 xLDR[0] = LDR_ADC_In;
noutram 0:5f63e9ea5a3a 40
noutram 0:5f63e9ea5a3a 41 //Calculate average for POT
noutram 0:5f63e9ea5a3a 42 float fSum = 0.0;
noutram 0:5f63e9ea5a3a 43 for (unsigned int n=0; n<N; n++) {
noutram 0:5f63e9ea5a3a 44 fSum += xPOT[n];
noutram 0:5f63e9ea5a3a 45 }
noutram 0:5f63e9ea5a3a 46 float fPOTAverage = fSum / (float)N;
noutram 0:5f63e9ea5a3a 47
noutram 0:5f63e9ea5a3a 48 //Calculate average for LDR
noutram 0:5f63e9ea5a3a 49 fSum = 0.0;
noutram 0:5f63e9ea5a3a 50 for (unsigned int n=0; n<N; n++) {
noutram 0:5f63e9ea5a3a 51 fSum += xLDR[n];
noutram 0:5f63e9ea5a3a 52 }
noutram 0:5f63e9ea5a3a 53 float fLDRAverage = fSum / (float)N;
noutram 0:5f63e9ea5a3a 54
noutram 0:5f63e9ea5a3a 55 //Write to terminal via Serial interface
noutram 0:5f63e9ea5a3a 56 pc.printf("%6.4f,%6.4f,%6.4f,%6.4f\n", xPOT[N/2], xLDR[N/2], fPOTAverage, fLDRAverage);
noutram 0:5f63e9ea5a3a 57
noutram 0:5f63e9ea5a3a 58 //Check the threshold
noutram 0:5f63e9ea5a3a 59 if (fLDRAverage > fPOTAverage) {
noutram 0:5f63e9ea5a3a 60 binaryOutput = 0; //Binary 000
noutram 0:5f63e9ea5a3a 61 } else {
noutram 0:5f63e9ea5a3a 62 binaryOutput = 7; //Binary 111
noutram 0:5f63e9ea5a3a 63 }
noutram 0:5f63e9ea5a3a 64
noutram 0:5f63e9ea5a3a 65 //Wait 1/100th second
noutram 0:5f63e9ea5a3a 66 wait(0.01);
noutram 0:5f63e9ea5a3a 67
noutram 0:5f63e9ea5a3a 68
noutram 0:5f63e9ea5a3a 69 } //end while(1)
noutram 0:5f63e9ea5a3a 70 } //end main
noutram 0:5f63e9ea5a3a 71
noutram 0:5f63e9ea5a3a 72
noutram 0:5f63e9ea5a3a 73 /*
noutram 0:5f63e9ea5a3a 74 First version of the updateAverage function
noutram 0:5f63e9ea5a3a 75 TODO
noutram 0:5f63e9ea5a3a 76 */
noutram 0:5f63e9ea5a3a 77 float updateAverage(float newSample, float buffer[])
noutram 0:5f63e9ea5a3a 78 {
noutram 0:5f63e9ea5a3a 79 //Local variable - remember to initialise!
noutram 0:5f63e9ea5a3a 80 float average = 0.0;
noutram 0:5f63e9ea5a3a 81
noutram 0:5f63e9ea5a3a 82 //TODO: Move all samples to the right
noutram 0:5f63e9ea5a3a 83
noutram 0:5f63e9ea5a3a 84
noutram 0:5f63e9ea5a3a 85 //TODO: Insert new sample
noutram 0:5f63e9ea5a3a 86
noutram 0:5f63e9ea5a3a 87
noutram 0:5f63e9ea5a3a 88 //TODO: Calculate average
noutram 0:5f63e9ea5a3a 89
noutram 0:5f63e9ea5a3a 90 //Return the result
noutram 0:5f63e9ea5a3a 91 return average;
noutram 0:5f63e9ea5a3a 92 }