-#define R_UART_RXBUF 0\r
-#define R_UART_TXBUF 0\r
-#define R_UART_BAUD_LOW 0\r
-#define R_UART_BAUD_HIGH 1\r
+#define R_UART_RXBUF 0 // LCR_DLAB = 0\r
+#define R_UART_TXBUF 0 // LCR_DLAB = 0\r
+#define R_UART_BAUD_LOW 0 // LCR_DLAB = 1\r
+#define R_UART_BAUD_HIGH 1 // LCR_DLAB = 1\r
+#define R_UART_IER 1 // LCR_DLAB = 0\r