Hi @ksoni306,
Assuming you have followed the setup instructions in the documentation. I think Display Porting in LVGL documentation is a good place to start.
In summary, all you have to do is define the buffer for your display, register the LVGL driver and callback function for flushing the buffer to your display.
Define the buffer,
/*A static or global variable to store the buffers*/
static lv_disp_buf_t disp_buf;
/*Static or global buffer(s). The second buffer is optional*/
static lv_color_t buf_1[MY_DISP_HOR_RES * 10];
static lv_color_t buf_2[MY_DISP_HOR_RES * 10];
/*Initialize `disp_buf` with the buffer(s) */
lv_disp_buf_init(&disp_buf, buf_1, buf_2, MY_DISP_HOR_RES*10);
Register the display driver for LVGL,
lv_disp_drv_t disp_drv; /*A variable to hold the drivers. Can be local variable*/
lv_disp_drv_init(&disp_drv); /*Basic initialization*/
disp_drv.buffer = &disp_buf; /*Set an initialized buffer*/
disp_drv.flush_cb = my_flush_cb; /*Set a flush callback to draw to the display*/
lv_disp_t * disp;
disp = lv_disp_drv_register(&disp_drv); /*Register the driver and save the created display objects*/
my_flush_cb is where you send the pixel data to your LCD. You can refer SSD1963 driver flush function and you can use it as a starting point for your flush_cb function.
void my_flush_cb(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
{
/*The most simple case (but also the slowest) to put all pixels to the screen one-by-one*/
int32_t x, y;
for(y = area->y1; y <= area->y2; y++) {
for(x = area->x1; x <= area->x2; x++) {
put_px(x, y, *color_p)
color_p++;
}
}
/* IMPORTANT!!!
* Inform the graphics library that you are ready with the flushing*/
lv_disp_flush_ready(disp);
}
Once all set, you can try below code for simple button example,
lv_obj_t * btn = lv_btn_create(lv_scr_act(), NULL); /*Add a button the current screen*/
lv_obj_set_pos(btn, 10, 10); /*Set its position*/
lv_obj_set_size(btn, 120, 50); /*Set its size*/
lv_obj_t * label = lv_label_create(btn, NULL); /*Add a label to the button*/
lv_label_set_text(label, "Button"); /*Set the labels text*/
while (1) {
lv_task_handler();
usleep(10 * 1000); /*Sleep for 10 millisecond*/
lv_tick_inc(10); /*Tell LittelvGL that 10 milliseconds were elapsed*/
}
Hope this will give you the kickstart you need. Let me know if you have any more questions.
Best Regards,
Prasad.