feat: use lvgl UI library

platformio.ini

@@ -16,8 +16,11 @@ monitor_speed = 115200
 lib_deps = 
 	ruiseixasm/Versatile_RotaryEncoder@^1.3.1
 	bodmer/TFT_eSPI@^2.5.43
+	lvgl/lvgl@^9.2.2
 build_flags = 
 	-Os
-	-D CORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG
+	-DCORE_DEBUG_LEVEL=ARDUHAL_LOG_LEVEL_DEBUG
-	-D USER_SETUP_LOADED=1
+	-DUSER_SETUP_LOADED=1
+	-DLV_CONF_INCLUDE_SIMPLE
 	-include $PROJECT_INCLUDE_DIR/TFT_eSPI_Setup_ILI9341_ESP32.h
+	-include $PROJECT_INCLUDE_DIR/lv_conf.h

src/main.cpp

@@ -1,5 +1,6 @@
 #include <Arduino.h>
 #include <Versatile_RotaryEncoder.h>
+#include <lvgl.h>
 #include <SPI.h>
 #include <TFT_eSPI.h>
 
@@ -7,6 +8,9 @@
 #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;
@@ -17,16 +21,24 @@ 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);
 
-TFT_eSPI tft = TFT_eSPI();
+uint32_t get_time();
+lv_obj_t *label;
+lv_timer_t *update_values_timer;
 
 void setup()
 {
@@ -46,35 +58,59 @@ void setup()
 
   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);
 
-  tft.init();
+  lv_init();
-  tft.setRotation(1);
+  lv_log_register_print_cb(handle_lvgl_logs);
-  delay(100);
+  lv_tick_set_cb(get_time);
-  tft.fillScreen(TFT_BLACK);
+  update_values_timer = lv_timer_create(handle_update_values, 5, NULL);
-  tft.setTextColor(TFT_WHITE, TFT_BLACK);
+  lv_timer_ready(update_values_timer);
 
-  int centerX = SCREEN_WIDTH / 2;
+  lv_display_t *display;
-  int centerY = SCREEN_HEIGHT / 2;
+  display = lv_tft_espi_create(SCREEN_HEIGHT, SCREEN_WIDTH, draw_buf, sizeof(draw_buf));
-  tft.drawCentreString("Setup complete.", centerX, centerY, FONT_SIZE);
+  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()
 {
-  int max = 0;
+  lv_timer_handler();
-  for (int i = 0; i < 100; i++)
+  delay(5);
+}
+
+void handle_pad_inputs(void *pvParameters)
+{
+  while (true)
   {
-    int value = analogRead(ANALOG_INPUT_PIN);
+    int max = 0;
-    if (!toneOn && value > 0)
+    for (int i = 0; i < 100; i++)
     {
-      toneOn = true;
+      int value = analogRead(ANALOG_INPUT_PIN);
+      if (!toneOn && value > 0)
+      {
+        toneOn = true;
+      }
+      if (value > max)
+      {
+        max = value;
+      }
+      delay(1);
     }
-    if (value > max)
-    {
-      max = value;
-    }
-    delay(1);
   }
 }
 
@@ -85,7 +121,7 @@ void handleToneGeneration(void *pvParameters)
   {
     if (toneOn)
     {
-      tone(ANALOG_OUTPUT_PIN, frequency, toneDuration);
+      // tone(ANALOG_OUTPUT_PIN, frequency, toneDuration);
       delay(toneDuration);
       toneOn = false;
     }
@@ -106,12 +142,7 @@ void handlePress()
 {
   Serial.println("Encoder pressed");
   digitalWrite(ONBOARD_LED_PIN, HIGH);
-
+  label_text = "Button pressed.";
-  int centerX = SCREEN_WIDTH / 2;
-  int centerY = SCREEN_HEIGHT / 2;
-
-  tft.fillScreen(TFT_BLACK);
-  tft.drawCentreString("Button pressed.", centerX, centerY, FONT_SIZE);
 }
 
 void handleRelease()
@@ -135,9 +166,25 @@ void handleRotate(int8_t rotation)
   Serial.print("Frequency: ");
   Serial.println(frequency);
 
-  int centerX = SCREEN_WIDTH / 2;
+  label_text = "Frequency: " + String(frequency) + "Hz";
-  int centerY = SCREEN_HEIGHT / 2;
+}
 
-  tft.fillScreen(TFT_BLACK);
+void handle_update_display(void *pvParameters)
-  tft.drawCentreString("Frequency: " + String(frequency) + "Hz", centerX, centerY, FONT_SIZE);
+{
+  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());
+  }
 }