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/**
 * Initialize a display buffer
 * @param disp_buf pointer `lv_disp_buf_t` variable to initialize
 * @param buf1 A buffer to be used by LittlevGL to draw the image.
 *             Always has to specified and can't be NULL.
 *             Can be an array allocated by the user. E.g. `static lv_color_t disp_buf1[1024 * 10]`
 *             Or a memory address e.g. in external SRAM
 * @param buf2 Optionally specify a second buffer to make image rendering and image flushing
 *             (sending to the display) parallel.
 *             In the `disp_drv->flush` you should use DMA or similar hardware to send
 *             the image to the display in the background.
 *             It lets LittlevGL to render next frame into the other buffer while previous is being
 * sent. Set to `NULL` if unused.
 * @param size_in_px_cnt size of the `buf1` and `buf2` in pixel count.
 */
void lv_disp_buf_init(lv_disp_buf_t * disp_buf, void * buf1, void * buf2, uint32_t size_in_px_cnt)
{
    memset(disp_buf, 0, sizeof(lv_disp_buf_t));

    disp_buf->buf1    = buf1;
    disp_buf->buf2    = buf2;
    disp_buf->buf_act = disp_buf->buf1;
    disp_buf->size    = size_in_px_cnt;
}