main.cpp

00001 /**
00002  * Notebook page https://os.mbed.com/users/JohnnyK/notebook/how-start-with-the-LVGL/
00003  */
00004 
00005 #include "mbed.h"
00006 #include "lvgl.h"
00007 #include "demos/lv_demos.h"            /*Comment/uncomment will switch between LVGL demos and Hello word example*/
00008 #include "hal_stm_lvgl/tft/tft.h "
00009 #include "hal_stm_lvgl/touchpad/touchpad.h" 
00010 
00011 #define LVGL_TICK   10                               //Time tick value for lvgl in ms (1-10msa)
00012 #define TICKER_TIME 10ms                             //modified to miliseconds
00013 
00014 Ticker ticker;                                       //Ticker for lvgl                    
00015  
00016 /*
00017  * Callback function for lvgl timing.
00018  * Call lv_tick_inc(x) every x milliseconds in a Timer or Task (x should be between 1 and 10). 
00019  * It is required for the internal timing of LittlevGL.
00020  */
00021 void lv_ticker_func(){
00022     lv_tick_inc(LVGL_TICK); 
00023 }
00024 
00025 #ifndef LV_DEMOS_H
00026 static void event_handler(lv_event_t* event)
00027 {
00028     lv_event_code_t code = lv_event_get_code(event);
00029     if(code == LV_EVENT_CLICKED) {
00030         printf("Clicked\n");
00031     }
00032     else if(code == LV_EVENT_VALUE_CHANGED) {
00033         printf("Toggled\n");
00034     }
00035 }
00036 #endif
00037 // main() runs in its own thread in the OS
00038 int main()
00039 {
00040     printf("LVGL-"); 
00041     lv_init();                                              //Initialize the LVGL
00042     tft_init();                                             //Initialize diplay 
00043     touchpad_init();                                        //Initialize touchpad
00044     ticker.attach(callback(&lv_ticker_func),TICKER_TIME);   //Attach callback to ticker
00045 
00046 #ifdef LV_DEMOS_H
00047     printf("Demo\n"); 
00048     lv_demo_widgets();
00049 #else
00050     printf("Hello world\n");
00051     lv_obj_t * label1 = lv_label_create(lv_scr_act());
00052     lv_label_set_long_mode(label1, LV_LABEL_LONG_WRAP);     /*Break the long lines*/
00053     lv_label_set_recolor(label1, true);                      /*Enable re-coloring by commands in the text*/
00054     lv_label_set_text(label1, "#0000ff Hello# #ff00ff world# #ff0000 - the LVGL and MbedOS#");
00055     lv_obj_set_width(label1, 150);
00056     lv_obj_align(label1, LV_ALIGN_TOP_MID, 0, 20);
00057 
00058     lv_obj_t * label2 = lv_label_create(lv_scr_act());
00059     lv_label_set_long_mode(label2, LV_LABEL_LONG_SCROLL_CIRCULAR);     /*Circular scroll*/
00060     lv_obj_set_width(label2, 150);
00061     lv_label_set_text(label2, "It is a circularly scrolling text. ");
00062     lv_obj_align(label2, LV_ALIGN_BOTTOM_MID, 0, 0);
00063     
00064     lv_obj_t * label;
00065     lv_obj_t * btn1 = lv_btn_create(lv_scr_act());
00066     lv_obj_add_event_cb(btn1, event_handler, LV_EVENT_ALL, NULL);
00067     lv_obj_align(btn1, LV_ALIGN_CENTER, 0, -25);
00068     label = lv_label_create(btn1);
00069     lv_label_set_text(label, "Button");
00070     lv_obj_t * btn2 = lv_btn_create(lv_scr_act());
00071     lv_obj_add_event_cb(btn2, event_handler,LV_EVENT_ALL, NULL);
00072     lv_obj_align(btn2, LV_ALIGN_CENTER, 0, 25);
00073     lv_obj_add_flag(btn2, LV_OBJ_FLAG_CHECKABLE);
00074     label = lv_label_create(btn2);
00075     lv_label_set_text(label, "Toggled");
00076 #endif
00077 
00078     while (true){
00079         lv_task_handler(); 
00080         //Call lv_task_handler() periodically every few milliseconds. 
00081         //It will redraw the screen if required, handle input devices etc.
00082         thread_sleep_for(LVGL_TICK); 
00083     }
00084 }