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Rotary encoder

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This commit is contained in:
Dejvino 2026-02-27 06:33:46 +01:00
parent d30bac7ec5
commit 59b48c1ab3
4 changed files with 84 additions and 10 deletions
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10
AudioThread.cpp
View File

@ -17,12 +17,6 @@ const int16_t AMPLITUDE = 16383; // Use a lower amplitude to avoid clipping (max
I2S i2s(OUTPUT);
// --- Synthesizer State ---
// Frequencies for a C-Major scale to pick from
const float NOTE_FREQUENCIES[] = {
261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25
};
const int NUM_NOTES = sizeof(NOTE_FREQUENCIES) / sizeof(NOTE_FREQUENCIES[0]);
float currentFrequency = 440.0f;
double phase = 0.0;
unsigned long lastNoteChangeTime = 0;
@ -50,8 +44,8 @@ void loopAudio() {
// Every 500ms, pick a new random note to play
if (now - lastNoteChangeTime > 500) {
lastNoteChangeTime = now;
int noteIndex = random(0, NUM_NOTES);
currentFrequency = NOTE_FREQUENCIES[noteIndex];
int noteIndex = random(0, SCALES[currentScaleIndex].numNotes);
currentFrequency = SCALES[currentScaleIndex].frequencies[noteIndex];
Serial.println("Playing note: " + String(currentFrequency) + " Hz");
}

11
SharedState.cpp
View File

@ -2,4 +2,13 @@
volatile unsigned long lastLoop0Time = 0;
volatile unsigned long lastLoop1Time = 0;
volatile bool watchdogActive = false;
volatile bool watchdogActive = false;
const Scale SCALES[] = {
{ "C Major", { 261.63, 293.66, 329.63, 349.23, 392.00, 440.00, 493.88, 523.25 }, 8 },
{ "C Minor", { 261.63, 293.66, 311.13, 349.23, 392.00, 415.30, 466.16, 523.25 }, 8 },
{ "Pentatonic", { 261.63, 293.66, 329.63, 392.00, 440.00, 523.25, 587.33, 659.25 }, 8 },
{ "Blues", { 261.63, 311.13, 349.23, 369.99, 392.00, 466.16, 523.25, 587.33 }, 8 }
};
const int NUM_SCALES = sizeof(SCALES) / sizeof(SCALES[0]);
volatile int currentScaleIndex = 0;

10
SharedState.h
View File

@ -7,4 +7,14 @@ extern volatile unsigned long lastLoop0Time;
extern volatile unsigned long lastLoop1Time;
extern volatile bool watchdogActive;
struct Scale {
const char* name;
const float frequencies[8];
int numNotes;
};
extern const Scale SCALES[];
extern const int NUM_SCALES;
extern volatile int currentScaleIndex;
#endif // SHAREDSTATE_H

63
UIThread.cpp
View File

@ -14,13 +14,45 @@
#define PIN_SDA 4
#define PIN_SCL 5
// Encoder Pins
#define PIN_ENC_CLK 12
#define PIN_ENC_DT 13
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
volatile int8_t encoderDelta = 0;
static uint8_t prevNextCode = 0;
static uint16_t store = 0;
// --- ENCODER INTERRUPT ---
// Robust Rotary Encoder reading
void readEncoder() {
static int8_t rot_enc_table[] = {0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0};
prevNextCode <<= 2;
if (digitalRead(PIN_ENC_DT)) prevNextCode |= 0x02;
if (digitalRead(PIN_ENC_CLK)) prevNextCode |= 0x01;
prevNextCode &= 0x0f;
// If valid state
if (rot_enc_table[prevNextCode]) {
store <<= 4;
store |= prevNextCode;
if ((store & 0xff) == 0x2b) encoderDelta--;
if ((store & 0xff) == 0x17) encoderDelta++;
}
}
void setupUI() {
Wire.setSDA(PIN_SDA);
Wire.setSCL(PIN_SCL);
Wire.begin();
pinMode(PIN_ENC_CLK, INPUT_PULLUP);
pinMode(PIN_ENC_DT, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(PIN_ENC_CLK), readEncoder, CHANGE);
attachInterrupt(digitalPinToInterrupt(PIN_ENC_DT), readEncoder, CHANGE);
if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;);
@ -34,7 +66,36 @@ void setupUI() {
display.display();
}
void handleInput() {
// Handle Encoder Rotation
int rotation = 0;
noInterrupts();
rotation = encoderDelta;
encoderDelta = 0;
interrupts();
if (rotation != 0) {
currentScaleIndex += rotation;
while (currentScaleIndex < 0) currentScaleIndex += NUM_SCALES;
while (currentScaleIndex >= NUM_SCALES) currentScaleIndex -= NUM_SCALES;
}
}
void loopUI() {
// sleep to avoid thread starvation
delay(10);
handleInput();
// The loop on core 0 is responsible for updating the UI.
delay(100);
static unsigned long lastUpdate = 0;
if (millis() - lastUpdate < 100) return;
lastUpdate = millis();
display.clearDisplay();
display.setCursor(0, 0);
display.setTextSize(1);
display.println(F("Current Scale:"));
display.setTextSize(2);
display.println(SCALES[currentScaleIndex].name);
display.display();
}