/*
 * Compile with:
 *
 * g++ -Wall test.cpp -o test -lrt -lpthread -lpigpio
 *
 * Run with:
 *
 * sudo ./test
 *
 *
 *
 */


#include <pigpio.h>
#include <stdio.h>
#include <unistd.h>


const int INPUT_PIN  = 25;
const int OUTPUT_PIN = 26;

const int PERIOD = 50000 ; // usec

const int DUTY_CYCLE = 0.001 ;

//================================ Options =====================================

unsigned int samplingRate      = 1;      // 1 microsecond (can be 1,2,4,5,10)

unsigned int start = 0;
unsigned int deltaTime;

void ppmOnEdge2 (int gpio, int level, uint32_t tick)
{
	if (level == 0) {
		start = tick;
		//fprintf(stderr, "\n");
	}

	if (level == 1) {
		deltaTime = tick - start;
		// Console output
		fprintf(stderr, "*** %d\n", deltaTime);

	}


}


//================================== Main ======================================

int main(int argc, char *argv[])
{
	int level = 1;

	// GPIO setup

	gpioCfgClock(samplingRate, PI_DEFAULT_CLK_PERIPHERAL, 0); /* last parameter is deprecated now */
	gpioInitialise();

	gpioSetMode(INPUT_PIN,PI_INPUT);

	gpioSetMode(OUTPUT_PIN,PI_OUTPUT);
	gpioWrite(26, level);

	gpioSetAlertFunc(INPUT_PIN, ppmOnEdge2);

	// Infinite sleep - all action is now happening in ppmOnEdge2() function

	while(1) {
		usleep(50000);

		level = 0;
		gpioWrite(OUTPUT_PIN, level);
		usleep (250);
		level = 1;
		gpioWrite(OUTPUT_PIN, level);

	}
	return 0;
}