Diff: main.cpp

Revision:

0:fb3e19364d48

Child:

1:85b1605ed4e0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jan 26 12:54:37 2016 +0000
@@ -0,0 +1,37 @@
+#include "mbed.h"
+
+#define TICKS_PER_REVOLUTION    12.0
+#define TICK_CHECK_PERIOD       0.1
+
+DigitalOut myled(LED1);
+Serial pc(USBTX, USBRX); // tx, rx
+Ticker periodicTimer1, periodicTimer2;
+ 
+float speed_rpm, speed_rps, ticks_per_second;
+volatile unsigned int tick_counter, final_count;
+
+InterruptIn freqInputPin(D2); 
+
+void freqInputPin_Interrupt() {
+    //Triggers on the rising edge of the frequency signal
+    tick_counter++;
+}
+
+void check_TickCount(){
+    final_count = tick_counter;
+    //pc.printf("\n\rTick Count is : %d", final_count);
+    tick_counter = 0;
+}
+
+void display_TickCount(){
+   //pc.printf("\n\r Final Count is : %.2f", (float) final_count*(1.0/TICK_CHECK_PERIOD));
+   pc.printf("\n\r Speed in RPM is  : %.2f", (float)(final_count*(1.0/TICK_CHECK_PERIOD))*(60.0/TICKS_PER_REVOLUTION));
+}
+
+int main() {
+    freqInputPin.rise(&freqInputPin_Interrupt); //chain interrupt to rising edge
+    periodicTimer1.attach(&check_TickCount, TICK_CHECK_PERIOD);
+    periodicTimer2.attach(&display_TickCount, 1.0); //Display conut once a second
+    while(1) { 
+    }
+}