SYNTAX
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(3)