Diff: main.cpp

Revision:

0:5f63e9ea5a3a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Sep 24 12:30:28 2015 +0000
@@ -0,0 +1,92 @@
+#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) {
+
+        //Move the samples in both arrays to the right
+        for (unsigned int n=(N-1); n>0; n--) {
+            xPOT[n] = xPOT[n-1];
+            xLDR[n] = xLDR[n-1];
+        }
+
+        //Insert the new sample at position 0
+        xPOT[0] = POT_ADC_In;
+        xLDR[0] = LDR_ADC_In;
+
+        //Calculate average for POT
+        float fSum = 0.0;
+        for (unsigned int n=0; n<N; n++) {
+            fSum += xPOT[n];
+        }
+        float fPOTAverage = fSum / (float)N;
+
+        //Calculate average for LDR
+        fSum = 0.0;
+        for (unsigned int n=0; n<N; n++) {
+            fSum += xLDR[n];
+        }
+        float fLDRAverage = fSum / (float)N;
+
+        //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
+
+
+/*
+    First version of the updateAverage function
+    TODO
+*/
+float updateAverage(float newSample, float buffer[])
+{
+    //Local variable - remember to initialise!
+    float average = 0.0;
+    
+    //TODO: Move all samples to the right
+ 
+    
+    //TODO: Insert new sample
+
+    
+    //TODO: Calculate average
+    
+    //Return the result
+    return average;
+}
\ No newline at end of file