UART_READ
lsr = UART_READ(LSR);
lsr = UART_READ(LSR);
(void)UART_READ(RBR);
c = UART_READ(RBR);
lsr = UART_READ(LSR);
lsr = UART_READ(uart1base, LSR);
lsr = UART_READ(uart1base, LSR);
return UART_READ(uart1base, RBR);
return (UART_READ(uart1base, LSR) & LSR_DRDY) != 0;
lsr = UART_READ(uart2base, LSR);
return UART_READ(uart2base, RBR);
return (UART_READ(uart2base, LSR) & LSR_DRDY) != 0;