hdlcd_read
unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
unsigned int mask = hdlcd_read(hdlcd, HDLCD_REG_INT_MASK);
version = hdlcd_read(hdlcd, HDLCD_REG_VERSION);
if (hdlcd_read(hdlcd, HDLCD_REG_COMMAND)) {
irq_status = hdlcd_read(hdlcd, HDLCD_REG_INT_STATUS);