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Remove debounce library dependency

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Debouncing, the way it was done may have been appropriate for human input, but is wholly inadequate for the sequential scanning of the host keyboard IC.
It is however neccessary to provide something like debounce, because the teensy and host IC aren't syncronized.
This commit is contained in:
Oliver Parczyk 2023-12-16 11:47:33 +01:00
parent 58bdf0aac7
commit 030f2a39ae
2 changed files with 22 additions and 32 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

48
src/main.cpp
View File

@ -1,5 +1,4 @@
#include <Arduino.h>
#include <Bounce2.h>
#define MIDI_NAME {'P', 'i', 'n', 'g', 'b', 'o', 'a', 'r', 'd'}
#define MIDI_NAME_LEN 9
@ -7,27 +6,19 @@
#define KEY_GROUP_NUM 9
#define KEY_PINS 6
#define NUMBER_OF_KEYS 49
#define BOUNCE_TIME 5
#define DEBOUNCE_TIMES 2
#define POWER_SUPPLY_CHECK_PIN 13
#define SELF_DRIVE_INTERVAL 100
Bounce group_pins[KEY_GROUP_NUM] {
{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 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 uint8_t self_drive_pins[KEY_GROUP_NUM] {8, 9, 10, 11, 12, 26, 23, 24, 25};
volatile uint8_t current_self_drive_pin = 0;
@ -64,17 +55,18 @@ uint8_t mapToMidi(uint8_t active_key_group, uint8_t key) {
// Check if any of the array pins fell since last time
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
group_pins[i].update();
// Check if the pin fell or is low
// ! inverted
if (group_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 (uint8_t i = 0; i < KEY_GROUP_NUM; i++) {
if (group_pins[i].read() == LOW) return i;
if (active_groups==1){
return last_active_key_group;
}
// Default return
@ -105,7 +97,7 @@ FASTRUN void powerStateChanged() {
void setup() {
// Set all in- and outputs
for (uint8_t i = 0; i < KEY_GROUP_NUM; i++) {
pinMode(group_pins[i].getPin(), INPUT);
pinMode(group_pins[i], INPUT);
pinMode(self_drive_pins[i], INPUT);
}
for (uint8_t i = 0; i < KEY_PINS; i++) {
@ -134,20 +126,20 @@ void loop() {
// ! inverted
if (value == LOW) {
// Check if the key is not already pressed
if (keys_pressed[active_key_group * 6 + i] == 0) {
if (keys_pressed[active_key_group * 6 + i] >= DEBOUNCE_TIMES) {
// Send MIDI message
usbMIDI.sendNoteOn(mapToMidi(active_key_group, i), 127, 1);
// Set the entry in the array
keys_pressed[active_key_group * 6 + i] = 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[active_key_group * 6 + i] == 1) {
if (keys_pressed[active_key_group * 6 + i] < DEBOUNCE_TIMES) {
// Send MIDI message
usbMIDI.sendNoteOff(mapToMidi(active_key_group, i), 0, 1);
// Set the entry in the array
keys_pressed[active_key_group * 6 + i] = 0;
}
// Set the entry in the array
keys_pressed[active_key_group * 6 + i] = 0;
}
}
}