Task 4.3.4 Solution
Dependencies: mbed
main.cpp
- Committer:
- noutram
- Date:
- 2015-09-24
- Revision:
- 0:6a8980b23272
File content as of revision 0:6a8980b23272:
#include "mbed.h" //Constants #define N 10 //Function Prototype float updateAverage(float newSample, float buffer[]); //Global objects Serial pc(USBTX, USBRX); BusOut binaryOutput(D5, D6, D7); AnalogIn POT_ADC_In(A0); AnalogIn LDR_ADC_In(A1); float xPOT[N]; //Aray of potentiometer samples float xLDR[N]; //Aray of LDR samples //Main function int main() { //Set baud rate to 115200 pc.baud(115200); //Print header pc.printf("POT,LDR,avPOT, acLDR\n\n"); while(1) { //Calculate averages float fPOTAverage = updateAverage(POT_ADC_In, xPOT); float fLDRAverage = updateAverage(LDR_ADC_In, xLDR); //Write to terminal via Serial interface pc.printf("%6.4f,%6.4f,%6.4f,%6.4f\n", xPOT[N/2], xLDR[N/2], fPOTAverage, fLDRAverage); //Check the threshold if (fLDRAverage > fPOTAverage) { binaryOutput = 0; //Binary 000 } else { binaryOutput = 7; //Binary 111 } //Wait 1/100th second wait(0.01); } //end while(1) } //end main /** Update and calculate the average. This has not been "hand optimised" yet * * @param newSample The new sample to be added to the buffer * @param buffer[] The array used to store N samples * @returns * average of the samples in the array buffer */ float updateAverage(float newSample, float buffer[]) { //Local variable - remember to initialise! float average = 0.0; //Move all samples to the right for (unsigned int n=(N-1); n>0; n--) { buffer[n] = buffer[n-1]; } //Insert new sample buffer[0] = newSample; //Calculate average for (unsigned int n=0; n<N; n++) { average += buffer[n]; } average /= (float)N; //Return the result return average; }