Re: [hpoj-devel] more code changes

[Tim W. <tw...@re...>]

On Fri, Mar 23, 2001 at 01:51:40AM -0800, David Paschal wrote:

> Hi, Tim.
>=20
> On a related note, Tim, how familiar are you with using the hardware-assi=
sted
> ECP transfer modes (using the FIFOs)?  I attempted to code support for th=
at
> into my ParPort class but had trouble getting both forward and reverse ECP
> transfers to work.  I'm thinking I may not be turning the bus around
> correctly.=20

There are lots of caveats in the datasheets.  I'm not convinced that
the parport_pc code gets it right either.

> For now I'm doing all of the signalling in software, just the way
> it was done in ieee12844pp.c, but eventually I'd like to start using the
> FIFOs (no DMA or interrupts) to try to improve performance.

Again, this is something that /dev/parport0 can supposedly help with,
but I guess it will be a while before applications do.

Tim.
*/