ESP32 | LittlevGL | Arduino IDE - [Part.1] Basic LittlevGL for Simple Note App📝

ESP32_LITTLEVGL_ARDUINO_IDE/Part1/2_lv_button_test/2_lv_button_test.ino

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+#include <lvgl.h>
+#include <Ticker.h>
+#include <TFT_eSPI.h>
+
+#define LVGL_TICK_PERIOD 60
+
+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];
+
+lv_obj_t * slider_label;
+int screenWidth = 480;
+int screenHeight = 320;
+  
+/* 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 */
+}
+
+bool my_touchpad_read(lv_indev_drv_t * indev_driver, lv_indev_data_t * data)
+{
+    uint16_t touchX, touchY;
+
+    bool touched = tft.getTouch(&touchX, &touchY, 600);
+
+    if(!touched)
+    {
+      return false;
+    }
+
+    if(touchX>screenWidth || touchY > screenHeight)
+    {
+      Serial.println("Y or y outside of expected parameters..");
+      Serial.print("y:");
+      Serial.print(touchX);
+      Serial.print(" x:");
+      Serial.print(touchY);
+    }
+    else
+    {
+
+      data->state = touched ? LV_INDEV_STATE_PR : LV_INDEV_STATE_REL; 
+  
+      /*Save the state and save the pressed coordinate*/
+      //if(data->state == LV_INDEV_STATE_PR) touchpad_get_xy(&last_x, &last_y);
+     
+      /*Set the coordinates (if released use the last pressed coordinates)*/
+      data->point.x = touchX;
+      data->point.y = touchY;
+  
+      Serial.print("Data x");
+      Serial.println(touchX);
+      
+      Serial.print("Data y");
+      Serial.println(touchY);
+
+    }
+
+    return false; /*Return `false` because we are not buffering and no more data to read*/
+}
+
+/* Interrupt driven periodic handler */
+static void lv_tick_handler(void)
+{
+
+  lv_tick_inc(LVGL_TICK_PERIOD);
+}
+
+
+void setup() {
+
+  Serial.begin(115200); /* prepare for possible serial debug */
+
+  lv_init();
+
+  tft.begin(); /* TFT init */
+  tft.setRotation(3);
+
+  //uint16_t calData[5] = { 275, 3620, 264, 3532, 1 };
+  uint16_t calData[5] = {299, 3588, 348, 3474, 1};
+  tft.setTouch(calData);
+
+  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 = screenWidth;
+  disp_drv.ver_res = screenHeight;
+  disp_drv.flush_cb = my_disp_flush;
+  disp_drv.buffer = &disp_buf;
+  lv_disp_drv_register(&disp_drv);
+
+  lv_indev_drv_t indev_drv;
+  lv_indev_drv_init(&indev_drv);             /*Descriptor of a input device driver*/
+  indev_drv.type = LV_INDEV_TYPE_POINTER;    /*Touch pad is a pointer-like device*/
+  indev_drv.read_cb = my_touchpad_read;      /*Set your driver function*/
+  lv_indev_drv_register(&indev_drv);         /*Finally register the driver*/
+
+
+  /*Initialize the graphics library's tick*/
+  tick.attach_ms(LVGL_TICK_PERIOD, lv_tick_handler);
+
+  lv_ex_btn_1();
+
+}
+
+
+void loop() {
+
+  lv_task_handler(); /* let the GUI do its work */
+  delay(5);
+}
+
+static void event_handler(lv_obj_t * obj, lv_event_t event)
+{
+    if(event == LV_EVENT_CLICKED) {
+        printf("Clicked\n");
+    }
+    else if(event == LV_EVENT_VALUE_CHANGED) {
+        printf("Toggled\n");
+    }
+}
+
+void lv_ex_btn_1(void)
+{
+    lv_obj_t * label;
+
+    lv_obj_t * btn1 = lv_btn_create(lv_scr_act(), NULL);
+    lv_obj_set_event_cb(btn1, event_handler);
+    lv_obj_align(btn1, NULL, LV_ALIGN_CENTER, 0, -40);
+
+    label = lv_label_create(btn1, NULL);
+    lv_label_set_text(label, "Button");
+
+    lv_obj_t * btn2 = lv_btn_create(lv_scr_act(), NULL);
+    lv_obj_set_event_cb(btn2, event_handler);
+    lv_obj_align(btn2, NULL, LV_ALIGN_CENTER, 0, 40);
+    lv_btn_set_toggle(btn2, true);
+    lv_btn_toggle(btn2);
+    lv_btn_set_fit2(btn2, LV_FIT_NONE, LV_FIT_TIGHT);
+
+    label = lv_label_create(btn2, NULL);
+    lv_label_set_text(label, "Toggled");
+}