Diff: main.cpp

Revision:

0:211fa784ae3e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Aug 28 07:53:11 2011 +0000
@@ -0,0 +1,91 @@
+/*
+****************************************************
+TCS230 test. COLOR LIGHT TO FREQUENCY CONVERTER.
+Frequency is measured by interrupts.
+
+Wiring: TCS230       mBed
+         p1(s0)      p5
+         p2(s1)      p6
+         p7(s2)      p7
+         p8(s3)      p8
+         p6(out)     p9
+p3(OE), p4(GND) tied to ground. p5(Vcc) tied to 3V3.
+
+Author: Lluis Nadal. August 2011.
+****************************************************
+*/
+
+
+#include "mbed.h"
+
+
+Serial pc(USBTX, USBRX);
+InterruptIn in(p9);
+DigitalOut s0(p5), s1(p6); // s2(p7), s3(p8)
+BusOut setColor(p8, p7); //(LSB pin,..., MSB pin): (s3, s2). Red: 0, Blue: 1, Clear: 2, Green: 3.
+Timer t;
+
+float period = 0; // This is the period between interrupts in microseconds
+float freq = 0;
+int n;
+int color; // Color
+
+
+void print() {  // Print to PC
+    switch (color) {
+        case 0:
+            pc.printf(" Red: \t\t%.2f Hz, \t%.2f us\r\n", freq, period);
+            break;
+        case 1:
+            pc.printf(" Blue: \t\t%.2f Hz, \t%.2f us\r\n", freq, period);
+            break;
+        case 2:
+            pc.printf(" Clear: \t%.2f Hz, \t%.2f us\r\n", freq, period);
+            break;
+        case 3:
+            pc.printf(" Green: \t%.2f Hz, \t%.2f us\r\n", freq, period);
+            pc.printf("\r\n");
+            break;
+    }
+}
+
+
+void time() {
+    if (n>99) { // Wait 100 interrupts
+        period = t.read_us()/(float)n; // Get time
+        freq = (1/period)*1000000;   // Convert period (in us) to frequency (Hz). Works up to 100kHz.
+        n = 0;
+
+        print(); // Print values to PC
+
+        color++;
+        if (color > 3) color = 0;
+        setColor = color;
+        wait(0.5);
+        t.reset(); // Reset timer and wait for next interrupt
+    }
+    n++;
+}
+
+
+int main() {
+
+    in.mode(PullDown); // Set the pin to Pull Down mode.
+    wait(1);
+    n = 0;
+    color = 0;
+    setColor = color;
+
+    s0 = 0;
+    s1 = 1; // Frequency 2% = 12 kHz full-scale.
+
+    in.rise(&time);  // Set up the interrupt for rising edge
+    t.start();       // Start the timer
+
+    while (1) {
+
+    }
+}
+
+
+