[sane-devel] EPP write with sanei_pp

[Anderson Lizardo]

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Gerhard Jaeger wrote:
> first try and use the sanei_pp_outb_data function. if this does not work,
> extend the sanei_pp lib by the needed functionality.

Tested, and it didn't work ;). Attached a (fairly simple) patch that
adds the "sanei_pp_outb_epp" function.

Now I have geniusvp2 using sanei_pp and (hopefully) portable. I've
noticed some performance loss though, if compared to the old ppdev code.
I'm not sure if it's because the sanei_pp have "one-byte-per-call"
functions only (and in fact I had to implement a loop on my code so I
can write multiple bytes) or if it's overhead of the libieee1284 library
itself.

> Don't use the libieee directly!

I'm not sure why not. Is it for better portability?

> AFAIR epp_write_data will be called inside the libieee, when the port
> is set to EPP mode! In the end, write data for SPP/EPP should be the
> same function, as they use the same port!

AFAIK, SPP data port is base+0 while EPP data port is base+4, and in EPP
mode both are accessible, so when I tried to use sanei_pp_outb_data
function I suppose it was trying to write to base+0.

- --
Anderson Lizardo
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