NAME

       serport - Hardware driver for the digital I/O bits of the 8250 and 16550 serial port.

SYNOPSIS

       loadrt serport io=addr[,addr...]

       The pin numbers refer to the 9-pin serial pinout.  Keep in mind that these ports generally
       use rs232 voltages, not 0/5V signals.

       Specify the I/O address of the serial ports using the module parameter  io=addr[,addr...].
       These  ports  must  not  be  in use by the kernel.  To free up the I/O ports after bootup,
       install setserial and execute a command like:
              sudo setserial /dev/ttyS0 uart none
       but it is best to ensure that the serial port is never used or  configured  by  the  Linux
       kernel  by  setting a kernel commandline parameter or not loading the serial kernel module
       if it is a modularized driver.

FUNCTIONS

       serport.N.read

       serport.N.write

PINS

       serport.N.pin-1-in bit out
              Also called DCD (data carrier detect); pin 8 on the 25-pin serial pinout

       serport.N.pin-6-in bit out
              Also called DSR (data set ready); pin 6 on the 25-pin serial pinout

       serport.N.pin-8-in bit out
              Also called CTS (clear to send); pin 5 on the 25-pin serial pinout

       serport.N.pin-9-in bit out
              Also called RI (ring indicator); pin 22 on the 25-pin serial pinout

       serport.N.pin-1-in-not bit out
              Inverted version of pin-1-in

       serport.N.pin-6-in-not bit out
              Inverted version of pin-6-in

       serport.N.pin-8-in-not bit out
              Inverted version of pin-8-in

       serport.N.pin-9-in-not bit out
              Inverted version of pin-9-in

       serport.N.pin-3-out bit in
              Also called TX (transmit data); pin 2 on the 25-pin serial pinout

       serport.N.pin-4-out bit in
              Also called DTR (data terminal ready); pin 20 on the 25-pin serial pinout

       serport.N.pin-7-out bit in
              Also called RTS (request to send); pin 4 on the 25-pin serial pinout

PARAMETERS

       serport.N.pin-3-out-invert bit rw
       serport.N.pin-4-out-invert bit rw
       serport.N.pin-7-out-invert bit rw
       serport.N.ioaddr u32 r

LICENSE

       GPL