Programowanie ekranu jest ogólnie łatwy niżej pliki i kod
#include <lvgl.h>
#include <TFT_eSPI.h>
#include <XPT2046_Touchscreen.h>
// Touchscreen pins
#define XPT2046_IRQ 36 // T_IRQ
#define XPT2046_MOSI 32 // T_DIN
#define XPT2046_MISO 39 // T_OUT
#define XPT2046_CLK 25 // T_CLK
#define XPT2046_CS 33 // T_CS
SPIClass touchscreenSPI = SPIClass(VSPI);
XPT2046_Touchscreen touchscreen(XPT2046_CS, XPT2046_IRQ);
#define SCREEN_WIDTH 240
#define SCREEN_HEIGHT 320
// Touchscreen coordinates: (x, y) and pressure (z)
int x, y, z;
#define DRAW_BUF_SIZE (SCREEN_WIDTH * SCREEN_HEIGHT / 10 * (LV_COLOR_DEPTH / 8))
uint32_t draw_buf[DRAW_BUF_SIZE / 4];
// If logging is enabled, it will inform the user about what is happening in the library
void log_print(lv_log_level_t level, const char * buf) {
LV_UNUSED(level);
Serial.println(buf);
Serial.flush();
}
// Get the Touchscreen data
void touchscreen_read(lv_indev_t * indev, lv_indev_data_t * data) {
// Checks if Touchscreen was touched, and prints X, Y and Pressure (Z)
if(touchscreen.tirqTouched() && touchscreen.touched()) {
// Get Touchscreen points
TS_Point p = touchscreen.getPoint();
// Calibrate Touchscreen points with map function to the correct width and height
x = map(p.x, 200, 3700, 1, SCREEN_WIDTH);
y = map(p.y, 240, 3800, 1, SCREEN_HEIGHT);
z = p.z;
data->state = LV_INDEV_STATE_PRESSED;
// Set the coordinates
data->point.x = x;
data->point.y = y;
// Print Touchscreen info about X, Y and Pressure (Z) on the Serial Monitor
/* Serial.print("X = ");
Serial.print(x);
Serial.print(" | Y = ");
Serial.print(y);
Serial.print(" | Pressure = ");
Serial.print(z);
Serial.println();*/
}
else {
data->state = LV_INDEV_STATE_RELEASED;
}
}
int btn1_count = 0;
// Callback that is triggered when btn1 is clicked
static void event_handler_btn1(lv_event_t * e) {
lv_event_code_t code = lv_event_get_code(e);
if(code == LV_EVENT_CLICKED) {
btn1_count++;
LV_LOG_USER("Button clicked %d", (int)btn1_count);
}
}
// Callback that is triggered when btn2 is clicked/toggled
static void event_handler_btn2(lv_event_t * e) {
lv_event_code_t code = lv_event_get_code(e);
lv_obj_t * obj = (lv_obj_t*) lv_event_get_target(e);
if(code == LV_EVENT_VALUE_CHANGED) {
LV_UNUSED(obj);
LV_LOG_USER("Toggled %s", lv_obj_has_state(obj, LV_STATE_CHECKED) ? "on" : "off");
}
}
static lv_obj_t * slider_label;
// Callback that prints the current slider value on the TFT display and Serial Monitor for debugging purposes
static void slider_event_callback(lv_event_t * e) {
lv_obj_t * slider = (lv_obj_t*) lv_event_get_target(e);
char buf[8];
lv_snprintf(buf, sizeof(buf), "%d%%", (int)lv_slider_get_value(slider));
lv_label_set_text(slider_label, buf);
lv_obj_align_to(slider_label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
LV_LOG_USER("Slider changed to %d%%", (int)lv_slider_get_value(slider));
}
void lv_create_main_gui(void) {
// Create a text label aligned center on top ("Hello, world!")
lv_obj_t * text_label = lv_label_create(lv_screen_active());
lv_label_set_long_mode(text_label, LV_LABEL_LONG_WRAP); // Breaks the long lines
lv_label_set_text(text_label, "Hello, world!");
lv_obj_set_width(text_label, 150); // Set smaller width to make the lines wrap
lv_obj_set_style_text_align(text_label, LV_TEXT_ALIGN_CENTER, 0);
lv_obj_align(text_label, LV_ALIGN_CENTER, 0, -90);
lv_obj_t * btn_label;
// Create a Button (btn1)
lv_obj_t * btn1 = lv_button_create(lv_screen_active());
lv_obj_add_event_cb(btn1, event_handler_btn1, LV_EVENT_ALL, NULL);
lv_obj_align(btn1, LV_ALIGN_CENTER, 0, -50);
lv_obj_remove_flag(btn1, LV_OBJ_FLAG_PRESS_LOCK);
btn_label = lv_label_create(btn1);
lv_label_set_text(btn_label, "Button");
lv_obj_center(btn_label);
// Create a Toggle button (btn2)
lv_obj_t * btn2 = lv_button_create(lv_screen_active());
lv_obj_add_event_cb(btn2, event_handler_btn2, LV_EVENT_ALL, NULL);
lv_obj_align(btn2, LV_ALIGN_CENTER, 0, 10);
lv_obj_add_flag(btn2, LV_OBJ_FLAG_CHECKABLE);
lv_obj_set_height(btn2, LV_SIZE_CONTENT);
btn_label = lv_label_create(btn2);
lv_label_set_text(btn_label, "Toggle");
lv_obj_center(btn_label);
// Create a slider aligned in the center bottom of the TFT display
lv_obj_t * slider = lv_slider_create(lv_screen_active());
lv_obj_align(slider, LV_ALIGN_CENTER, 0, 60);
lv_obj_add_event_cb(slider, slider_event_callback, LV_EVENT_VALUE_CHANGED, NULL);
lv_slider_set_range(slider, 0, 100);
lv_obj_set_style_anim_duration(slider, 2000, 0);
// Create a label below the slider to display the current slider value
slider_label = lv_label_create(lv_screen_active());
lv_label_set_text(slider_label, "0%");
lv_obj_align_to(slider_label, slider, LV_ALIGN_OUT_BOTTOM_MID, 0, 10);
}
void setup() {
String LVGL_Arduino = String("LVGL Library Version: ") + lv_version_major() + "." + lv_version_minor() + "." + lv_version_patch();
Serial.begin(115200);
Serial.println(LVGL_Arduino);
// Start LVGL
lv_init();
// Register print function for debugging
lv_log_register_print_cb(log_print);
// Start the SPI for the touchscreen and init the touchscreen
touchscreenSPI.begin(XPT2046_CLK, XPT2046_MISO, XPT2046_MOSI, XPT2046_CS);
touchscreen.begin(touchscreenSPI);
// Set the Touchscreen rotation in landscape mode
// Note: in some displays, the touchscreen might be upside down, so you might need to set the rotation to 0: touchscreen.setRotation(0);
touchscreen.setRotation(2);
// Create a display object
lv_display_t * disp;
// Initialize the TFT display using the TFT_eSPI library
disp = lv_tft_espi_create(SCREEN_WIDTH, SCREEN_HEIGHT, draw_buf, sizeof(draw_buf));
lv_display_set_rotation(disp, LV_DISPLAY_ROTATION_270);
// Initialize an LVGL input device object (Touchscreen)
lv_indev_t * indev = lv_indev_create();
lv_indev_set_type(indev, LV_INDEV_TYPE_POINTER);
// Set the callback function to read Touchscreen input
lv_indev_set_read_cb(indev, touchscreen_read);
// Function to draw the GUI (text, buttons and sliders)
lv_create_main_gui();
}
void loop() {
lv_task_handler(); // let the GUI do its work
lv_tick_inc(5); // tell LVGL how much time has passed
delay(5); // let this time pass
}