hello_sine.cpp

/* hello sine : teensy LC
 *
 * 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 <cstdint>
#include <Arduino.h>
#include <Audio.h>
#include <usb_dev.h>

#define dbg(...) \
	fiprintf(stderr, __VA_ARGS__)
#define dbg_putc(c) \
	fputc((c), stderr)

#define USE_DAC
#define USE_I2S

void onNoteOn(byte chan, byte note, byte vel);
void onNoteOff(byte chan, byte note, byte vel);

#if defined(USE_DAC)
AudioControlSGTL5000	dac;
#endif
AudioSynthWaveformSine  sine1;
#if defined(USE_I2S)
AudioOutputI2S        	out;
#else
AudioOutputUSB        	out;
#endif
AudioConnection         patchCord1(sine1, 0, out, 0);
AudioConnection         patchCord2(sine1, 0, out, 1);

usb_serial_class 		Serial;
elapsedMillis 			since_LED_switch, since_hello;
elapsedMillis			interrupt_time;

uint32_t	Freq = 440;
uint32_t	counter, bigtime;
uint32_t	interrupts_last, interrupts_delta;

void setup()
{
	pinMode(LED_BUILTIN, OUTPUT);
	usb_init();
	Serial.begin(115200);
	delay(100);

	while (!Serial)
		delay(100);
	dbg("Hello sine " BUILD_DATE "\n");

	usbMIDI.setHandleNoteOn(onNoteOn);
	usbMIDI.setHandleNoteOff(onNoteOff);
	delay(100);

	AudioMemory(2);
	sine1.frequency(Freq);
	sine1.amplitude(1.0);
	delay(100);

#if defined(USE_DAC)
	dac.enable();
	dac.lineOutLevel( 14 );
	dbg("dac enabled\n");
#endif
}

void loop()
{
	static bool run = true;
#if defined(USE_DAC)
	static bool levelHigh = true;
#endif

	if (since_LED_switch > 500) {
		digitalToggleFast(LED_BUILTIN);
		since_LED_switch = 0;
	}
	if (since_hello >= 1000) {
		dbg(".");
		if (++counter >= 10) {
			uint32_t this_count = out.isrCount();
			interrupts_delta = this_count - interrupts_last;
			interrupts_last = this_count;
			dbg(" %5lu %5lu %03lu\n", interrupts_delta,
				(uint32_t )interrupt_time, bigtime++);
			interrupt_time = 0;
			counter = 0;
		}
		since_hello = 0;
	}
	while (Serial.available()) {
		int incoming = Serial.read();
		switch (incoming) {
		case 'b':
			dbg("sine used %u cycles\n", sine1.cpu_cycles_total );
		break;
		case ' ':
			run = !run;
			dbg("now %s\n", run? "running" : "stopped");
			if (run) {
				sine1.amplitude(1.0);
			}
			else {
				sine1.amplitude(0.0);
			}
		break;
#if defined(USE_DAC)
		case 'l':
			if (levelHigh) {
				dac.lineOutLevel( 28 );
			}
			else {
				dac.lineOutLevel( 14 );
			}
			levelHigh = !levelHigh;
			dbg("level now %s\n", levelHigh? "high" : "low");
		break;
#endif
		case 'r':
			_reboot_Teensyduino_();
		break;
		default:
			dbg_putc(incoming);
		}
	}

	usbMIDI.read();
}

void onNoteOn(byte chan, byte note, byte vel)
{
	dbg("N %d on\n", note);
}

void onNoteOff(byte chan, byte note, byte vel)
{
	dbg("N %d off\n", note);
}