DOKK / manpages / debian 10 / libieee1284-3-dev / ieee1284_ecp_fwd_to_rev.3.en
IEEE1284_ECP_FWD_TO_(3) Functions IEEE1284_ECP_FWD_TO_(3)

ieee1284_ecp_fwd_to_rev, ieee1284_ecp_rev_to_fwd - ECP direction switching

int ieee1284_ecp_fwd_to_rev(struct parport *port);

int ieee1284_ecp_rev_to_fwd(struct parport *port);

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.

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).

Tim Waugh <twaugh@redhat.com>

Author.

Copyright © 2001-2003 Tim Waugh

09/18/2007