hello_timer.cpp

/* hello teensy timer
 *
 * Copyright (c) 2020 Tim Braun
 *
 * 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:
 *
 * 1. The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * 2. If the Software is incorporated into a build system that allows
 * selection among a list of target devices, then similar target
 * devices manufactured by PJRC.COM must be included in the list of
 * target devices and selectable in the same manner.
 *
 * 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 <Arduino.h>
#include <usb_dev.h>

#define dbg(...) \
	Serial.printf(__VA_ARGS__)
#define dbg_putc(c) \
	Serial.print((char )(c))

void onTick();

usb_serial_class Serial;
elapsedMillis since_LED_switch;
IntervalTimer my_time;

void setup()
{
	pinMode(LED_BUILTIN, OUTPUT);
	usb_init();
	Serial.begin(115200);

	delay(100);
	while (!Serial)
		delay(100);
	dbg("\nHello teensy timer\n\n");
	my_time.begin(onTick, 138000);
}


void loop()
{
	if (since_LED_switch > 500) {
		digitalToggleFast(LED_BUILTIN);
		dbg("This is how we do it\n");
		since_LED_switch = 0;
	}
}

void onTick()
{
	static uint8_t beat;

	if (++beat == 1) {
		dbg_putc('1');
	}
	else {
		dbg_putc(beat + '0');
		if (beat >= 4)
			beat = 0;
	}
}

#if 0
int main(void)
{
	pinMode(LED_BUILTIN, OUTPUT);
	while (1) {
		digitalWriteFast(LED_BUILTIN, HIGH);
		delay(250);
		digitalWriteFast(LED_BUILTIN, LOW);
		delay(250);
		digitalWriteFast(LED_BUILTIN, HIGH);
		delay(250);
		digitalWriteFast(LED_BUILTIN, LOW);
		delay(250);
		digitalWriteFast(LED_BUILTIN, HIGH);
		delay(250);
		digitalWriteFast(LED_BUILTIN, LOW);
		delay(500);
	}
}
#endif