vail-adapter/vail-adapter.ino

114 lines
2.2 KiB
C++

// Copyright 2020 Neale Pickett
// Distributed under the MIT license
// Please see https://github.com/nealey/vail-adapter/
// MIDIUSB - Version: Latest
#include <MIDIUSB.h>
#include <Keyboard.h>
#include "bounce2.h"
#ifdef ARDUINO_SEEED_XIAO_M0
#define DIT_PIN 2
#define DAH_PIN 1
#define KEY_PIN 0
#else
#define DIT_PIN 12
#define DAH_PIN 11
#define KEY_PIN 10
#endif
#define KBD_PIN 9
#define STRAIGHT_KEY ','
#define DIT_KEY '['
#define DAH_KEY ']'
bool iambic = true;
Bounce kbd = Bounce();
Bounce dit = Bounce();
Bounce dah = Bounce();
Bounce key = Bounce();
void setup() {
pinMode(LED_BUILTIN, OUTPUT);
kbd.attach(KBD_PIN, INPUT_PULLUP);
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;
}
digitalWrite(LED_BUILTIN, !iambic);
}
void midiKey(bool down, uint8_t key) {
midiEventPacket_t event = {down?9:8, down?0x90:0x80, key, 0x7f};
MidiUSB.sendMIDI(event);
MidiUSB.flush();
}
void loop() {
bool keyboard;
kbd.update();
keyboard = !kbd.read();
// 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);
}
}
}
}