NAME

       rtapi_outb, rtapi_inb - Perform hardware I/O

SYNTAX

       void rtapi_outb(unsigned char byte, unsigned int port)

       unsigned char rtapi_inb(unsigned int port)

ARGUMENTS

       port   The address of the I/O port

       byte   The byte to be written to the port

DESCRIPTION

       rtapi_outb writes a byte to a hardware I/O port.  rtapi_inb reads a byte from a hardware I/O port.

REALTIME CONSIDERATIONS

       May  be  called  from  init/cleanup  code  and from within realtime tasks.  Not available in non-realtime
       components.

RETURN VALUE

       rtapi_inb returns the byte read from the given I/O port

NOTES

       The I/O address should be within a  region  previously  allocated  by  rtapi_request_region.   Otherwise,
       another real-time module or the Linux kernel might attempt to access the I/O region at the same time.

SEE ALSO

       rtapi_region(3rtapi)

LinuxCNC Documentation                             2006-10-12                                 rtapi_outb(3rtapi)