bunt _ / PulseCounter

Counts pulses on pin p29. Pulse frequency can be up to 48 MHz.

Example, counting 48MHz-pulses on pin p29 generated by pin p22 with PwmOscillator (https://mbed.org/users/geotec/code/PwmOscillator/). Pins p22 & p29 must be connected. Count is triggered when pin p30 = high (I connected oscillator with 9kHz that triggered periodically).

#include "mbed.h"
#include "PwmOscillator.h"
#include "PulseCounter.h"

Serial usbPC(USBTX, USBRX);   // sends log messages via USB to PC terminal
PwmOscillator pulseGenerator; // generates pulses to be count (48 MHz) on pin p22. Connect this pin to p29 (counter input).
PulseCounter pulseCounter;    // counts the pulses on pin p29 between trigger events (= rising edges) on pin p30.

int main() 
{
    usbPC.printf("---> start <---\n");
    pulseGenerator.initWithFrequency(48000000);
    pulseCounter.init();
    pulseGenerator.start();
        
    pulseCounter.start();   
    wait(1);        // waiting 1 second for trigger events (pin30: rising edge). Count pulses between trigger events.
    pulseCounter.stop();
                        
    pulseGenerator.stop();
        
    // read & print pulseCounter results
    uint32_t pulseCounterResults[20];
    pulseCounter.counterArray(&pulseCounterResults[0],sizeof pulseCounterResults / sizeof (uint32_t));
        
    for(int i = 0; i < (sizeof pulseCounterResults / sizeof (uint32_t)); i++) {
        usbPC.printf("counter of trigger event %i = %u\n",i,pulseCounterResults[i]);
    }
    //
        
    usbPC.printf("   finished.\n");
}

Diff: PulseCounter.cpp

Revision:
1:83149916f8a9
Parent:
0:157c2fddaa68
Child:
2:8d50e024637b
--- a/PulseCounter.cpp	Sat Dec 15 14:26:47 2012 +0000
+++ b/PulseCounter.cpp	Sat Dec 15 14:29:08 2012 +0000
@@ -1,3 +1,21 @@
+/* Copyright (c) 2012 Christian Buntebarth, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software 
+ * and associated documentation files (the "Software"), to deal in the Software without restriction, 
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, 
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or 
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
 #include "mbed.h"
 #include "PulseCounter.h"