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
to switch from forward to reverse, and
to switch from reverse to forward.
They act on the parallel port associated with
port, which must be claimed.
Direction switched successfully.
lacks the required capability. This could be due to a limitation of this version of libieee1284, or a hardware limitation.
parameter is invalid (for instance, perhaps the
is not claimed).