drumz/src/main.cpp

#include <Arduino.h>
#include <Versatile_RotaryEncoder.h>
#include <lvgl.h>
#include <SPI.h>
#include <TFT_eSPI.h>

#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 240
#define FONT_SIZE 2

#define DRAW_BUF_SIZE (SCREEN_WIDTH * SCREEN_HEIGHT / 10 * (LV_COLOR_DEPTH / 8))
uint32_t draw_buf[DRAW_BUF_SIZE / 4];

const int ONBOARD_LED_PIN = 2;
const int ANALOG_INPUT_PIN = 34;
const int ANALOG_OUTPUT_PIN = 25;

const int ENTER_BUTTON_PIN = 14;
const int ENCODER_A_PIN = 12;
const int ENCODER_B_PIN = 13;

void handleToneGeneration(void *pvParameters);
void handleInputControls(void *pvParameters);
void handle_lvgl_logs(lv_log_level_t level, const char *buf);
void handle_pad_inputs(void *pvParameters);
void handle_update_display(void *pvParameters);
void handle_update_values(lv_timer_t *timer);

bool toneOn = false;
int frequency = 220; // A4

String label_text;

Versatile_RotaryEncoder *encoder;
void handlePress();
void handleRelease();
void handleRotate(int8_t rotation);

uint32_t get_time();
lv_obj_t *label;
lv_timer_t *update_values_timer;

void setup()
{
  Serial.begin(115200);
  pinMode(ONBOARD_LED_PIN, OUTPUT);
  pinMode(ANALOG_INPUT_PIN, INPUT);
  pinMode(ANALOG_OUTPUT_PIN, OUTPUT);

  pinMode(ENTER_BUTTON_PIN, INPUT);
  pinMode(ENCODER_A_PIN, INPUT);
  pinMode(ENCODER_B_PIN, INPUT);

  encoder = new Versatile_RotaryEncoder(ENCODER_A_PIN, ENCODER_B_PIN, ENTER_BUTTON_PIN);
  encoder->setHandlePress(handlePress);
  encoder->setHandlePressRelease(handleRelease);
  encoder->setHandleRotate(handleRotate);

  xTaskCreate(handleToneGeneration, "handleToneGeneration", 2048, NULL, 1, NULL);
  xTaskCreate(handleInputControls, "handleInputContols", 2048, NULL, 1, NULL);
  xTaskCreate(handle_pad_inputs, "handle_pad_inputs", 2048, NULL, 1, NULL);

  lv_init();
  lv_log_register_print_cb(handle_lvgl_logs);
  lv_tick_set_cb(get_time);
  update_values_timer = lv_timer_create(handle_update_values, 5, NULL);
  lv_timer_ready(update_values_timer);

  lv_display_t *display;
  display = lv_tft_espi_create(SCREEN_HEIGHT, SCREEN_WIDTH, draw_buf, sizeof(draw_buf));
  lv_display_set_rotation(display, LV_DISPLAY_ROTATION_90);

  label = lv_label_create(lv_screen_active());
  lv_obj_align(label, LV_ALIGN_CENTER, 0, 0);

  Serial.println("setup complete");
  label_text = "Boot complete.";
}

void handle_lvgl_logs(lv_log_level_t level, const char *buf)
{
  Serial.printf("LVGL: %s\r\n", buf);
}

uint32_t get_time()
{
  return esp_timer_get_time() / 1000;
}

void loop()
{
  lv_timer_handler();
  delay(5);
}

void handle_pad_inputs(void *pvParameters)
{
  while (true)
  {
    int max = 0;
    for (int i = 0; i < 100; i++)
    {
      int value = analogRead(ANALOG_INPUT_PIN);
      if (!toneOn && value > 0)
      {
        toneOn = true;
      }
      if (value > max)
      {
        max = value;
      }
      delay(1);
    }
  }
}

void handleToneGeneration(void *pvParameters)
{
  int toneDuration = 100;
  while (true)
  {
    if (toneOn)
    {
      // tone(ANALOG_OUTPUT_PIN, frequency, toneDuration);
      delay(toneDuration);
      toneOn = false;
    }
    delay(10);
  }
}

void handleInputControls(void *pvParameters)
{
  while (true)
  {
    encoder->ReadEncoder();
    delay(1);
  }
}

void handlePress()
{
  Serial.println("Encoder pressed");
  digitalWrite(ONBOARD_LED_PIN, HIGH);
  label_text = "Button pressed.";
}

void handleRelease()
{
  Serial.println("Encoder released");
  digitalWrite(ONBOARD_LED_PIN, LOW);
}

void handleRotate(int8_t rotation)
{
  Serial.print("Encoder rotated by ");
  Serial.println(rotation);
  if (rotation > 0)
  {
    frequency += 10;
  }
  else if (rotation < 0)
  {
    frequency -= 10;
  }
  Serial.print("Frequency: ");
  Serial.println(frequency);

  label_text = "Frequency: " + String(frequency) + "Hz";
}

void handle_update_display(void *pvParameters)
{
  while (true)
  {
    if (lv_label_get_text(label) != label_text.c_str())
    {
      lv_label_set_text(label, label_text.c_str());
    }
    delay(100);
  }
}

void handle_update_values(lv_timer_t *timer)
{
  if (label != NULL && lv_label_get_text(label) != label_text.c_str())
  {
    lv_label_set_text(label, label_text.c_str());
  }
}