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ensonic/wave-play-dac.ino

Created October 15, 2015 16:16
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wave-play-dac.ino
#include "SparkIntervalTimer/SparkIntervalTimer.h"
// connect a 8Ohm speaker with a 220Ohm resistor to pin DAC and GND
const int audio = DAC1;
// internal LED to signal activity
const int led = D7;
// button to trigger playback
const int btn = D0;
IntervalTimer audio_clock;
volatile int wave_ix = 0;
char wave_data[] = /* 4327 */
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,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0xFF
,0x00,0xFF,0x01,0x01,0xFF,0x00,0xFF,0x00,0xFF,0x00,0xFF,0x00,0x00,0xFF,0xFF
,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x01,0x00,0x00
,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00
,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00
,0x00,0x00,0xFF,0xFF,0x00,0x00,0xFF,0xFF,0x00,0x00,0x01,0x00,0x01,0x01,0x00
,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x01
,0xFF,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0xFF,0x01,0x00,0xFF
,0x00,0x01,0x01,0x00,0x01,0x01,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00
,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01
,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x00,0x00,0xFF,0xFF,0x00
,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00
,0xFF,0x00,0xFF,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00
,0x00,0x00,0xFF,0xFF,0xFF,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF
,0x00,0x00,0x00,0x01,0x01,0x01,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x01
,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0xFF,0x00,0x00
,0x00,0x00,0xFF,0xFF,0x00,0x00,0x01,0x00,0xFF,0x00,0xFF,0x00,0x01,0xFF,0x00
,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01
,0x00,0x01,0x00,0x01,0x00,0x00,0xFF,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00
,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0xFF,0x00,0x00,0xFF
,0x00,0x01,0xFF,0xFF,0xFF,0x00,0x00,0x00,0xFF,0x00,0x00,0xFF,0x00,0xFF,0x00
,0x00,0x00,0xFF,0x00,0xFF,0xFF,0x00,0xFF,0x00,0xFF,0x00,0x00,0x00,0x00,0xFF
,0x00,0x00,0x00,0xFF,0x00,0xFF,0x01,0x00,0x00,0x00,0x01,0x00,0x00,0xFF,0x00
,0x00,0x00,0x00,0x01,0x00,0xFF,0x00,0x00,0x01,0x00,0x00,0x01,0x00,0xFF,0x00
,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00
,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x01,0x01,0x00,0x00
,0x00,0x01,0xFF,0x00,0x00,0xFF,0x00,0x00,0x01,0x00,0x01,0x00,0x00,0x00,0x00
,0x01,0x01,0x00,0x01,0xFF,0x00,0x00};
void setup() {
pinMode(led, OUTPUT);
}
void play_wave(void) {
if (wave_ix < sizeof(wave_data)) {
int v = wave_data[wave_ix];
// turn 2s complement into positive numbers
if (v>=0x80) {
v = 0xFF-v;
}
pinMode(audio, OUTPUT);
analogWrite(audio, (v<<5));
wave_ix++;
}
}
void start_play(void) {
wave_ix = 0;
audio_clock.begin(play_wave, 125, uSec);
}
void stop_play(void) {
audio_clock.end();
pinMode(audio, OUTPUT);
analogWrite(audio, 0);
wave_ix = 0;
}
bool clicked = false;
void loop() {
if (wave_ix >= sizeof(wave_data)) {
stop_play();
digitalWrite(led, LOW);
}
// read the state of the pushbutton value:
int buttonState = digitalRead(btn);
// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {
clicked = true;
} else {
if (clicked && wave_ix == 0) {
clicked = false;
start_play();
digitalWrite(led, HIGH);
}
}
}
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