vail-adapter/vail-adapter.ino

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// Copyright 2020 Neale Pickett
// Distributed under the MIT license
// Please see https://github.com/nealey/vail-adapter/
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// MIDIUSB - Version: Latest
#include <MIDIUSB.h>
#include <Keyboard.h>
#include "bounce2.h"
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#ifdef ARDUINO_SEEED_XIAO_M0
# define DIT_PIN 2
# define DAH_PIN 1
# define KEY_PIN 0
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#else
# define DIT_PIN 12
# define DAH_PIN 11
# define KEY_PIN 10
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#endif
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#define STRAIGHT_KEY ','
#define DIT_KEY KEY_LEFT_CTRL
#define DAH_KEY KEY_RIGHT_CTRL
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bool iambic = true;
bool keyboard = true;
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Bounce dit = Bounce();
Bounce dah = Bounce();
Bounce key = Bounce();
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
dit.attach(DIT_PIN, INPUT_PULLUP);
dah.attach(DAH_PIN, INPUT_PULLUP);
key.attach(KEY_PIN, INPUT_PULLUP);
Keyboard.begin();
// Straight keys need to wire the dah pin to ground somehow.
// The easiest way I can think of to do this is to use a TS connector
// instead of a TRS connector.
for (int i = 0; i < 16; i++) {
dah.update();
}
if (dah.read() == LOW) {
iambic = false;
} else {
iambic = true;
}
// Blink 4 times
for (int i = 0; i < 8; i += 1) {
digitalWrite(LED_BUILTIN, i % 2);
delay(250);
}
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}
void midiKey(bool down, uint8_t key) {
midiEventPacket_t event = {down?9:8, down?0x90:0x80, key, 0x7f};
MidiUSB.sendMIDI(event);
MidiUSB.flush();
}
void midiProbe() {
midiEventPacket_t event = MidiUSB.read();
if (event.byte1 == 0x80) {
// Key release, channel 0
if (event.byte2 == 0x00) {
// C0 note
keyboard = false;
}
}
}
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void loop() {
midiProbe();
digitalWrite(LED_BUILTIN, !keyboard);
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// Monitor straight key pin
if (key.update()) {
midiKey(key.fell(), 0);
if (keyboard) {
if (key.fell()) {
Keyboard.press(STRAIGHT_KEY);
} else {
Keyboard.release(STRAIGHT_KEY);
}
}
}
// Monitor dit pin, which could be straight key if dah was closed on boot
if (dit.update()) {
uint8_t kbdKey, mKey;
if (iambic) {
kbdKey = DIT_KEY;
mKey = 1;
} else {
kbdKey = STRAIGHT_KEY;
mKey = 0;
}
midiKey(dit.fell(), mKey);
if (keyboard) {
if (dit.fell()) {
Keyboard.press(kbdKey);
} else {
Keyboard.release(kbdKey);
}
}
}
// Monitor dah pin
if (iambic && dah.update()) {
midiKey(dah.fell(), 2);
if (keyboard) {
if (dah.fell()) {
Keyboard.press(DAH_KEY);
} else {
Keyboard.release(DAH_KEY);
}
}
}
}