/* main.cpp
 * mbed project: Simple_Square_Wave
 * mbed board: FRDM-KL46Z
 * Generate square waves using DigitalOut.
 */

#include "mbed.h"

DigitalOut Square_Wave(PTD3); // Used PWM output is PTD3
InterruptIn Control_Testing(PTC12);  // SW3

void Control_T(void);

int START_STOP_FLAG = 0;
float period_s = 0.0001;

extern serial_t stdio_uart;

int main(int arc, char **argv)
{
	serial_init(&stdio_uart, USBTX, USBRX);
	serial_baud(&stdio_uart, 115200);
	printf("starting\r\n");

	Control_Testing.rise(&Control_T);    // Enable getMode interrupt handler
	__enable_irq();

	while(1)
	{
		if(START_STOP_FLAG == 1)
		{
			Square_Wave.write(0);
			wait(period_s/2);
			Square_Wave.write(1);
			wait(period_s/2);
		}
		else
			Square_Wave.write(0);
	}
}

void Control_T(void)
{
	if(START_STOP_FLAG == 0)
	{
		period_s = 1;
		START_STOP_FLAG = 1;
	}
	else
	{
		START_STOP_FLAG = 0;
		Square_Wave.write(0);
	}
}