ieee1284_ecp_rev_to_fwd(3) - Linux man page

Name

ieee1284_ecp_fwd_to_rev, ieee1284_ecp_rev_to_fwd - ECP direction switching

Synopsis

int ieee1284_ecp_fwd_to_rev(struct parport *port);

int ieee1284_ecp_rev_to_fwd(struct parport *port);

Description

These functions are used to switch directions when in ECP mode. On negotiation to ECP mode the direction is forward (in other words, host-to-peripheral). Use ieee1284_ecp_fwd_to_rev to switch from forward to reverse, and ieee1284_ecp_rev_to_fwd to switch from reverse to forward.

They act on the parallel port associated with port, which must be claimed.

Return Value

E1284_OK

Direction switched successfully.
E1284_NOTIMPL: The port lacks the required capability. This could be due to a limitation of this version of libieee1284, or a hardware limitation.
E1284_INVALIDPORT: The port parameter is invalid (for instance, perhaps the port is not claimed).

Author

Tim Waugh <twaugh@redhat.com>