161 lines
3.5 KiB
C++
161 lines
3.5 KiB
C++
// Copyright 2020 Neale Pickett
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// Distributed under the MIT license
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// Please see https://github.com/nealey/vail-adapter/
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// MIDIUSB - Version: Latest
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#include <MIDIUSB.h>
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#include <Keyboard.h>
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#include "bounce2.h"
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#ifdef ARDUINO_SEEED_XIAO_M0
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# define DIT_PIN 2
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# define DAH_PIN 1
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# define KEY_PIN 0
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# define PIEZO 7
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# define LED_ON false
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#else
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# define DIT_PIN 12
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# define DAH_PIN 11
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# define KEY_PIN 10
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# define PIEZO 7
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# define LED_ON true
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#endif
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#define LED_OFF (!LED_ON)
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#define STRAIGHT_KEY ','
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#define DIT_KEY KEY_LEFT_CTRL
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#define DAH_KEY KEY_RIGHT_CTRL
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#define TONE 660
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#define MILLISECOND 1
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#define SECOND (1 * MILLISECOND)
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bool keyboard = true;
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bool trs = false; // true if a TRS plug is in a TRRS jack
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uint16_t iambicDelay = 80 * MILLISECOND;
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Bounce dit = Bounce();
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Bounce dah = Bounce();
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Bounce key = Bounce();
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void setup() {
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pinMode(LED_BUILTIN, OUTPUT);
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pinMode(PIEZO, OUTPUT);
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dit.attach(DIT_PIN, INPUT_PULLUP);
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dah.attach(DAH_PIN, INPUT_PULLUP);
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key.attach(KEY_PIN, INPUT_PULLUP);
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Keyboard.begin();
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// To auto-sense a straight key in a TRRS jack,
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// we just check to see if DAH is closed.
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// The sleeve on the straight key's TRS plug
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// will short the second ring to the sleeve.
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for (int i = 0; i < 16; i++) {
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delay(20);
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dah.update();
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}
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if (dah.read() == LOW) {
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trs = true;
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}
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}
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// A reentrant doodad to blink out the letter V at startup
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// After startup, display the status of the keyboard
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#define HELLO_BITS 0b0000101010111000
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void setLED() {
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static bool beepin = false;
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int beat = millis() / iambicDelay;
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bool on = keyboard; // If we're not in intro, display status of keyboard
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if (beat < 16) {
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on = HELLO_BITS & (1 << (15-beat));
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if (on != beepin) {
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if (on) {
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tone(PIEZO, TONE);
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} else {
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noTone(PIEZO);
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}
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beepin = on;
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}
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}
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digitalWrite(LED_BUILTIN, on?LED_ON:LED_OFF);
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}
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void midiKey(bool down, uint8_t key) {
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midiEventPacket_t event = {down?9:8, down?0x90:0x80, key, 0x7f};
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MidiUSB.sendMIDI(event);
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MidiUSB.flush();
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}
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void midiProbe() {
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midiEventPacket_t event = MidiUSB.read();
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uint16_t msg = (event.byte1 << 8) | (event.byte2 << 0);
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switch (msg) {
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case 0x8B00: // Controller 0: turn keyboard mode on/off
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keyboard = (event.byte3 > 0x3f);
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break;
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case 0x8B01: // Controller 1: set iambic speed (0-254)
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// I am probably never going to use this,
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// because as soon as I implement it,
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// people are going to want a way to select mode A or B,
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// or typeahead,
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// or some other thing that I don't want to maintain
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// simultaneously in both C and JavaScript
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iambicDelay = event.byte3 << 1;
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break;
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}
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}
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void loop() {
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midiProbe();
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setLED();
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// Monitor straight key pin
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if (key.update()) {
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midiKey(key.fell(), 0);
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if (key.fell()) {
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tone(PIEZO, TONE);
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if (keyboard) {
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Keyboard.press(STRAIGHT_KEY);
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}
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} else {
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noTone(PIEZO);
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if (keyboard) {
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Keyboard.release(STRAIGHT_KEY);
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}
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}
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}
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// If we made dit = dah, we have a straight key on the dit pin,
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// so we skip iambic polling.
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if (trs) {
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return;
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}
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if (dit.update()) {
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midiKey(dit.fell(), 1);
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if (keyboard) {
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if (dit.fell()) {
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Keyboard.press(DIT_KEY);
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} else {
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Keyboard.release(DAH_KEY);
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}
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}
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}
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// Monitor dah pin
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if (dah.update()) {
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midiKey(dah.fell(), 2);
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if (keyboard) {
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if (dah.fell()) {
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Keyboard.press(DAH_KEY);
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} else {
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Keyboard.release(DAH_KEY);
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}
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}
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}
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}
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