bunt _
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");
}