ieee1284_ecp_fwd_to_rev, ieee1284_ecp_rev_to_fwd — ECP direction switching
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.
Direction switched successfully.
port lacks the
required capability. This could be due to a limitation
of this version of libieee1284, or a hardware
port parameter is
invalid (for instance, perhaps the
port is not claimed).