test_btn.py

def init_drv():
        import SDL
        SDL.init()

        # Register SDL display driver.

        disp_buf1 = lv.disp_buf_t()
        buf1_1 = bytes(480*10)
        lv.disp_buf_init(disp_buf1,buf1_1, None, len(buf1_1)//4)
        disp_drv = lv.disp_drv_t()
        lv.disp_drv_init(disp_drv)
        disp_drv.buffer = disp_buf1
        disp_drv.flush_cb = SDL.monitor_flush
        disp_drv.hor_res = 480
        disp_drv.ver_res = 320
        lv.disp_drv_register(disp_drv)

        # Regsiter SDL mouse driver

        indev_drv = lv.indev_drv_t()
        lv.indev_drv_init(indev_drv) 
        indev_drv.type = lv.INDEV_TYPE.POINTER;
        indev_drv.read_cb = SDL.mouse_read;
        lv.indev_drv_register(indev_drv);

import lvgl as lv
lv.init()

init_drv()

scr = lv.obj()
btn = lv.btn(scr)
lv.scr_load(scr)