c0ntroller/keyboard
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Make it work

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Daniel 2023-12-16 13:03:03 +01:00 committed by GitHub
commit 2cd7817d5c
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2 changed files with 62 additions and 78 deletions
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2
platformio.ini
View File

@ -12,6 +12,4 @@
platform = teensy
board = teensylc
framework = arduino
lib_deps =
thomasfredericks/Bounce2@^2.71
build_flags = -D USB_MIDI -D TEENSY_OPT_FASTEST

134
src/main.cpp
View File

@ -1,50 +1,38 @@
#include <Arduino.h>
#include <Bounce2.h>
#define MIDI_NAME {'P', 'i', 'n', 'g', 'b', 'o', 'a', 'r', 'd'}
#define MIDI_NAME_LEN 9
#define CHECK_PINS 9
#define KEY_GROUP_NUM 9
#define KEY_PINS 6
#define BOUNCE_TIME 5
#define NUMBER_OF_KEYS 49
#define DEBOUNCE_TIMES 2
#define POWER_SUPPLY_CHECK_PIN 13
#define NUMBER_OF_KEYS 49
#define SELF_DRIVE_INTERVAL 100
Bounce check_pins[CHECK_PINS] {
{14, BOUNCE_TIME}, // not KEYS1..6
{15, BOUNCE_TIME}, // not KEYS7..12
{16, BOUNCE_TIME}, // not KEYS13..18
{17, BOUNCE_TIME}, // not KEYS19..24
{18, BOUNCE_TIME}, // not KEYS25..30
{19, BOUNCE_TIME}, // not KEYS31..36
{20, BOUNCE_TIME}, // not KEYS37..42
{21, BOUNCE_TIME}, // not KEYS43..48
{22, BOUNCE_TIME} // not KEYS49
};
const uint8_t group_pins[KEY_GROUP_NUM] {14, 15, 16, 17, 18, 19, 20, 21, 22};
// not KEY0%6..not KEY5%6
const unsigned char key_pins[KEY_PINS] {2, 3, 4, 5, 6, 7};
const uint8_t key_pins[KEY_PINS] {2, 3, 4, 5, 6, 7};
// Array of pressed keys (initially all 0)
bool keys_pressed[NUMBER_OF_KEYS];
uint8_t keys_pressed[NUMBER_OF_KEYS];
// K1, K2, K3, K4, K5, K12, K13, K14, K15
const unsigned char self_drive_pins[CHECK_PINS] {8, 9, 10, 11, 12, 26, 23, 24, 25};
volatile unsigned char curr_self_drive_pin = 0;
IntervalTimer self_drive_timer = IntervalTimer();
const uint8_t self_drive_pins[KEY_GROUP_NUM] {8, 9, 10, 11, 12, 26, 23, 24, 25};
uint8_t current_self_drive_pin = 0;
// Map the current array and pressed key to a MIDI note
unsigned char mapToMidi(char curr_arr, char key) {
unsigned char offset = (curr_arr >> 1) * 12;
// TODO: maybe we have to switch the notes and array offsets
uint8_t mapToMidi(uint8_t active_key_group, uint8_t key) {
uint8_t offset = (active_key_group >> 1) * 12;
// case 3 and case 4 are swapped on purpose to reflect circuitry
// Uneven offset are the upper octave, even the lower
if (curr_arr & 1) {
if (active_key_group & 1) {
switch (key) {
case 0: return offset + 42; // F#2 + offset
case 1: return offset + 43; // G2 + offset
case 2: return offset + 44; // G#2 + offset
case 3: return offset + 45; // A2 + offset
case 4: return offset + 46; // A#2 + offset
case 4: return offset + 45; // A2 + offset
case 3: return offset + 46; // A#2 + offset
case 5: return offset + 47; // B2 + offset
}
} else {
@ -52,8 +40,8 @@ unsigned char mapToMidi(char curr_arr, char key) {
case 0: return offset + 36; // C2 + offset
case 1: return offset + 37; // C#2 + offset
case 2: return offset + 38; // D2 + offset
case 3: return offset + 39; // D#2 + offset
case 4: return offset + 40; // E2 + offset
case 4: return offset + 39; // D#2 + offset
case 3: return offset + 40; // E2 + offset
case 5: return offset + 41; // F2 + offset
}
}
@ -63,18 +51,19 @@ unsigned char mapToMidi(char curr_arr, char key) {
}
// Check if any of the array pins fell since last time
char findCurrentArrPin() {
for (unsigned char i = 0; i < CHECK_PINS; i++) {
int8_t getActiveKeyGroup() {
uint8_t active_groups = 0;
int8_t last_active_key_group = -1;
for (uint8_t i = 0; i < KEY_GROUP_NUM; i++) {
// Update status
check_pins[i].update();
// Check if the pin fell or is low
// ! inverted
if (check_pins[i].fell()) return i;
if (digitalReadFast(group_pins[i]) == LOW){
last_active_key_group = (int8_t) i;
active_groups++;
}
}
// If none fell we should have enough time to see which one is low
for (unsigned char i = 0; i < CHECK_PINS; i++) {
if (check_pins[i].read() == LOW) return i;
if (active_groups==1){
return last_active_key_group;
}
// Default return
@ -84,75 +73,72 @@ char findCurrentArrPin() {
// Set the next self drive pin
FASTRUN void nextSelfDrivePin() {
// Set the current pin to high
digitalWriteFast(self_drive_pins[curr_self_drive_pin], HIGH);
digitalWriteFast(self_drive_pins[current_self_drive_pin != 0 ? current_self_drive_pin - 1 : KEY_GROUP_NUM - 1], LOW);
digitalWriteFast(self_drive_pins[current_self_drive_pin], HIGH);
// Set the next pin
curr_self_drive_pin = (curr_self_drive_pin + 1) % CHECK_PINS;
}
// Interrupt for power supply check
FASTRUN void powerStateChanged() {
unsigned char state = digitalReadFast(POWER_SUPPLY_CHECK_PIN);
// ! inverted
if (state == LOW) {
curr_self_drive_pin = 0;
self_drive_timer.begin(nextSelfDrivePin, SELF_DRIVE_INTERVAL);
} else {
self_drive_timer.end();
}
current_self_drive_pin = (current_self_drive_pin + 1) % KEY_GROUP_NUM;
}
// Initial start function
void setup() {
// Set all in- and outputs
for (unsigned char i = 0; i < CHECK_PINS; i++) {
pinMode(check_pins[i].getPin(), INPUT);
pinMode(self_drive_pins[i], INPUT);
for (uint8_t i = 0; i < KEY_GROUP_NUM; i++) {
pinMode(group_pins[i], INPUT);
pinMode(self_drive_pins[i], OUTPUT);
}
for (unsigned char i = 0; i < KEY_PINS; i++) {
for (uint8_t i = 0; i < KEY_PINS; i++) {
pinMode(key_pins[i], INPUT);
}
pinMode(POWER_SUPPLY_CHECK_PIN, INPUT);
// Manual call, so we can set the initial state
powerStateChanged();
// Setup interrupt for power supply
attachInterrupt(POWER_SUPPLY_CHECK_PIN, []() { while (true); }, CHANGE);
}
// Main loop
void loop() {
// Find active arr pin
char curr_arr = findCurrentArrPin();
int8_t active_key_group = getActiveKeyGroup();
// If none is active, we do nothing, else we check the keys
if (curr_arr >= 0) {
if (active_key_group >= 0) {
// Get all the key values ans send the MIDI message if needed
unsigned char value;
uint8_t value;
for (unsigned char i = 0; i < KEY_PINS; i++) {
for (uint8_t i = 0; i < KEY_PINS; i++) {
// due to the circuitry, there is one phantom note above
// the highest key constantly 'playing'
// but we don't need to scan that far anyway
if (active_key_group == KEY_GROUP_NUM-1 && i>0){
break;
}
value = digitalReadFast(key_pins[i]);
// If the key is pressed, we send a MIDI message and set the entry in the array
// ! inverted
if (value == LOW) {
// Check if the key is not already pressed
if (keys_pressed[curr_arr * 6 + i] == 0) {
if (keys_pressed[active_key_group * 6 + i] >= DEBOUNCE_TIMES) {
// Send MIDI message
usbMIDI.sendNoteOn(mapToMidi(curr_arr, i), 127, 1);
// Set the entry in the array
keys_pressed[curr_arr * 6 + i] = 1;
usbMIDI.sendNoteOn(mapToMidi(active_key_group, i), 127, 1);
}
// Set the entry in the array
keys_pressed[active_key_group * 6 + i] += keys_pressed[active_key_group * 6 + i] < 0xFF ? 1 : 0;
} else {
// Check if the key is not already released
if (keys_pressed[curr_arr * 6 + i] == 1) {
if (keys_pressed[active_key_group * 6 + i] < DEBOUNCE_TIMES) {
// Send MIDI message
usbMIDI.sendNoteOff(mapToMidi(curr_arr, i), 0, 1);
// Set the entry in the array
keys_pressed[curr_arr * 6 + i] = 0;
usbMIDI.sendNoteOff(mapToMidi(active_key_group, i), 0, 1);
}
// Set the entry in the array
keys_pressed[active_key_group * 6 + i] = 0;
}
}
}
// MIDI Controllers should discard incoming MIDI messages.
while (usbMIDI.read()) {
while (usbMIDI.read()) {}
// switch to next key group, if self powered
if (digitalReadFast(POWER_SUPPLY_CHECK_PIN) == LOW) {
nextSelfDrivePin();
}
}