ESP32 | LittlevGL | Arduino IDE - [Part.0] Touch Display Setup for Simple Note App📝

ESP32_LITTLEVGL_ARDUINO_IDE/Part0/3_lv_HelloWorld/3_lv_HelloWorld.ino

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+#include <lvgl.h>
+#include <Ticker.h>
+#include <TFT_eSPI.h>
+
+#define LVGL_TICK_PERIOD 20
+
+Ticker tick; /* timer for interrupt handler */
+TFT_eSPI tft = TFT_eSPI(); /* TFT instance */
+static lv_disp_buf_t disp_buf;
+static lv_color_t buf[LV_HOR_RES_MAX * 10];
+
+#if USE_LV_LOG != 0
+/* Serial debugging */
+void my_print(lv_log_level_t level, const char * file, uint32_t line, const char * dsc)
+{
+
+  Serial.printf("%s@%d->%s\r\n", file, line, dsc);
+  delay(100);
+}
+#endif
+
+/* Display flushing */
+void my_disp_flush(lv_disp_drv_t *disp, const lv_area_t *area, lv_color_t *color_p)
+{
+  uint16_t c;
+
+  tft.startWrite(); /* Start new TFT transaction */
+  tft.setAddrWindow(area->x1, area->y1, (area->x2 - area->x1 + 1), (area->y2 - area->y1 + 1)); /* set the working window */
+  for (int y = area->y1; y <= area->y2; y++) {
+    for (int x = area->x1; x <= area->x2; x++) {
+      c = color_p->full;
+      tft.writeColor(c, 1);
+      color_p++;
+    }
+  }
+  tft.endWrite(); /* terminate TFT transaction */
+  lv_disp_flush_ready(disp); /* tell lvgl that flushing is done */
+}
+
+/* Interrupt driven periodic handler */
+static void lv_tick_handler(void)
+{
+
+  lv_tick_inc(LVGL_TICK_PERIOD);
+}
+
+/* Reading input device (simulated encoder here) */
+bool read_encoder(lv_indev_drv_t * indev, lv_indev_data_t * data)
+{
+  static int32_t last_diff = 0;
+  int32_t diff = 0; /* Dummy - no movement */
+  int btn_state = LV_INDEV_STATE_REL; /* Dummy - no press */
+
+  data->enc_diff = diff - last_diff;;
+  data->state = btn_state;
+
+  last_diff = diff;
+
+  return false;
+}
+
+void setup() {
+
+  Serial.begin(115200); /* prepare for possible serial debug */
+
+  lv_init();
+
+#if USE_LV_LOG != 0
+  lv_log_register_print(my_print); /* register print function for debugging */
+#endif
+
+  tft.begin(); /* TFT init */
+  tft.setRotation(3); /* Landscape orientation */
+
+  lv_disp_buf_init(&disp_buf, buf, NULL, LV_HOR_RES_MAX * 10);
+
+  /*Initialize the display*/
+  lv_disp_drv_t disp_drv;
+  lv_disp_drv_init(&disp_drv);
+  disp_drv.hor_res = 480;
+  disp_drv.ver_res = 320;
+  disp_drv.flush_cb = my_disp_flush;
+  disp_drv.buffer = &disp_buf;
+  lv_disp_drv_register(&disp_drv);
+
+
+  /*Initialize the touch pad*/
+  lv_indev_drv_t indev_drv;
+  lv_indev_drv_init(&indev_drv);
+  indev_drv.type = LV_INDEV_TYPE_ENCODER;
+  indev_drv.read_cb = read_encoder;
+  lv_indev_drv_register(&indev_drv);
+
+  /*Initialize the graphics library's tick*/
+  tick.attach_ms(LVGL_TICK_PERIOD, lv_tick_handler);
+
+  /* Create simple label */
+  lv_obj_t *label = lv_label_create(lv_scr_act(), NULL);
+  lv_label_set_text(label, "Hello Arduino! (V6.1)");
+  lv_obj_align(label, NULL, LV_ALIGN_CENTER, 0, 0);
+}
+
+
+void loop() {
+
+  lv_task_handler(); /* let the GUI do its work */
+  delay(5);
+}