Diff: main.cpp

Revision:

0:94a3a01d13c2

Child:

1:0ef745d284a1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Oct 13 22:24:09 2011 +0000
@@ -0,0 +1,67 @@
+/*
+****************************************************
+Frequency is measured by interrupts.
+
+Wiring: TSL230       mBed
+         p1(s0)      H (p39)
+         p2(s1)      L (p1)
+         p7(s2)      H (p39)
+         p8(s3)      H (p39)
+         p6(out)     p11
+les pattes du TSL230 qui reste :
+p3(OE), p4(GND) tied to ground. p5(Vcc) tied to 3V3.
+
+Author: Samir Bouaziz. october 2011.
+*********************(******************************
+*/
+
+
+#include "mbed.h"
+
+
+Serial pc(USBTX, USBRX);
+InterruptIn in(p11);
+Timer t,t2;
+
+float period = 0; // This is the period between interrupts in microseconds
+float freq = 0;
+volatile int demiper,n=0,per;
+
+void itup() {
+   switch(n){
+      case 0 :
+               t.start();
+               n++;
+               break;
+      case 1 : 
+      case 10: t.stop();
+               per=t.read_us();
+               n=0;
+               t.reset();
+               break;
+      default : n++;
+                break;
+    }
+}
+
+void itdown() {
+    demiper=t.read_us();
+    t.stop();
+}
+
+
+int main() {
+
+//    in.mode(PullUp); // Set the pin to Pull Down mode.
+    in.rise(&itup);  // Set up the interrupt for rising edge
+//    in.fall(&itdown);  // Set up the interrupt for rising edge
+    while (1) {
+        wait(1);
+        //freq= 100000.0/((float)per);
+        pc.printf("val= %f \r",1000000./(float)per);
+
+    }
+}
+
+
+