LVGL 9 Arduino Template

LVGL9/LVGL9_project_arduino_template.txt

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+/* 
+ * This assumes you already have LVGL working with Arduino/ESP32
+	- Arduino 	
+		- C:\Users\kolap\Documents\Arduino
+	- EEZ Studio 
+		- C:\Users\kolap\eez-projects
+		- C:\Users\kolap\Documents\Arduino\EEZ_studio_projects
+	- Square Line
+		- C:\Users\kolap\Documents\SquareLine\tutorials
+		- C:\Users\kolap\Documents\SquareLine\tutorials\Export_UI_files		
+		- C:\Users\kolap\Documents\Arduino\SQ_line_CYD
+ 1. Create UI with Squareline
+  - Remember to set both screen width/height and Depth=16 bits as used by ESP32
+  - File > Project settings set the following
+    - Project Export Root
+    - UI Files Export Path (This will contain files you will need to copy over to Arduino project)
+      - Remember this location as you will need to copy the contents.
+  - Export the UI code
+    - Export > Export UI Files
+      - This will create files in UI Files Export Path you created above
+  - Create a new Arduino project 
+	- Open an existing one
+  - Copy all UI Files to the Arduino project root
+  - In Arduino setup() add:
+    - ui_init(); 
+    - Run the program
+ */
+
+#include <lvgl.h>
+#include "ui.h"
+
+#include <TFT_eSPI.h>
+
+#include <XPT2046_Touchscreen.h>
+// A library for interfacing with the touch screen
+//
+// Can be installed from the library manager (Search for "XPT2046")
+//https://github.com/PaulStoffregen/XPT2046_Touchscreen
+// ----------------------------
+// Touch Screen pins
+// ----------------------------
+
+// The CYD touch uses some non default
+// SPI pins
+
+#define XPT2046_IRQ 36
+#define XPT2046_MOSI 32
+#define XPT2046_MISO 39
+#define XPT2046_CLK 25
+#define XPT2046_CS 33
+SPIClass touchscreenSpi = SPIClass(VSPI);
+XPT2046_Touchscreen touchscreen(XPT2046_CS, XPT2046_IRQ);
+uint16_t touchScreenMinimumX = 200, touchScreenMaximumX = 3700, touchScreenMinimumY = 240, touchScreenMaximumY = 3800;
+
+/*Set to your screen resolution*/
+#define TFT_HOR_RES 320
+#define TFT_VER_RES 240
+
+/*LVGL draw into this buffer, 1/10 screen size usually works well. The size is in bytes*/
+#define DRAW_BUF_SIZE (TFT_HOR_RES * TFT_VER_RES / 10 * (LV_COLOR_DEPTH / 8))
+
+#if LV_USE_LOG != 0
+void my_print(lv_log_level_t level, const char *buf) {
+  LV_UNUSED(level);
+  Serial.println(buf);
+  Serial.flush();
+}
+#endif
+
+/* LVGL calls it when a rendered image needs to copied to the display*/
+void my_disp_flush(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map) {
+  /*Call it to tell LVGL you are ready*/
+  lv_disp_flush_ready(disp);
+}
+
+/*Read the touchpad*/
+void my_touchpad_read(lv_indev_t *indev, lv_indev_data_t *data) {
+  if (touchscreen.touched()) {
+    TS_Point p = touchscreen.getPoint();
+    //Some very basic auto calibration so it doesn't go out of range
+    if (p.x < touchScreenMinimumX) touchScreenMinimumX = p.x;
+    if (p.x > touchScreenMaximumX) touchScreenMaximumX = p.x;
+    if (p.y < touchScreenMinimumY) touchScreenMinimumY = p.y;
+    if (p.y > touchScreenMaximumY) touchScreenMaximumY = p.y;
+    //Map this to the pixel position
+    data->point.x = map(p.x, touchScreenMinimumX, touchScreenMaximumX, 1, TFT_HOR_RES); /* Touchscreen X calibration */
+    data->point.y = map(p.y, touchScreenMinimumY, touchScreenMaximumY, 1, TFT_VER_RES); /* Touchscreen Y calibration */
+    data->state = LV_INDEV_STATE_PRESSED;
+    /*
+    Serial.print("Touch x ");
+    Serial.print(data->point.x);
+    Serial.print(" y ");
+    Serial.println(data->point.y);
+    */
+  } else {
+    data->state = LV_INDEV_STATE_RELEASED;
+  }
+}
+
+lv_indev_t *indev;      //Touchscreen input device
+uint8_t *draw_buf;      //draw_buf is allocated on heap otherwise the static area is too big on ESP32 at compile
+uint32_t lastTick = 0;  //Used to track the tick timer
+
+
+void setup() {
+
+  //Some basic info on the Serial console
+  String LVGL_Arduino = "LVGL demo ";
+  LVGL_Arduino += String('V') + lv_version_major() + "." + lv_version_minor() + "." + lv_version_patch();
+  Serial.begin(115200);
+  Serial.println(LVGL_Arduino);
+
+  //Initialise the touchscreen
+  touchscreenSpi.begin(XPT2046_CLK, XPT2046_MISO, XPT2046_MOSI, XPT2046_CS); /* Start second SPI bus for touchscreen */
+  touchscreen.begin(touchscreenSpi);                                         /* Touchscreen init */
+  touchscreen.setRotation(3);                                                /* Inverted landscape orientation to match screen */
+
+  //Initialise LVGL GUI
+  lv_init();
+
+  draw_buf = new uint8_t[DRAW_BUF_SIZE];
+  lv_display_t *disp;
+  disp = lv_tft_espi_create(TFT_HOR_RES, TFT_VER_RES, draw_buf, DRAW_BUF_SIZE);
+
+  //Initialize the XPT2046 input device driver
+  indev = lv_indev_create();
+  lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
+  lv_indev_set_read_cb(indev, my_touchpad_read);
+
+  //Done
+  Serial.println("LVGL Setup done");
+
+  //Integrate EEZ Studio GUI
+  ui_init();
+
+}
+
+//Requires LVGL 9.0+
+void loop() {
+  lv_tick_inc(millis() - lastTick);  //Update the tick timer. Tick is new for LVGL 9
+  lastTick = millis();
+  lv_timer_handler();  //Update the UI
+  delay(5);
+}