IEEE1284_ECP_FWD_TO_

Section: Functions (3)
Updated: 07/26/2009
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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>