ieee1284_ecp_rev_to_fwd3
Ecp direction switching
Part of ieee1284_ecp_fwd_to_rev(3).
Usage
int ieee1284_ecp_fwd_to_rev(struct parport *port);
int ieee1284_ecp_rev_to_fwd(struct parport *port);
Overview
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).
Releases
11 releases since Debian 3.1 (Sarge); the text changed 1 time.