Name
ieee1284_ecp_fwd_to_rev, ieee1284_ecp_rev_to_fwd — ECP direction switching
Synopsis
int ieee1284_ecp_fwd_to_rev( | port); | |
int ieee1284_ecp_rev_to_fwd( | 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).