[sane-devel] CX5200 problem ...[debianbugs@saahbs.net: recompiled libsane with debugging symbols and stepped through the code...]

[Olaf Meeuwissen]

Michal Sabala <debianbugs at saahbs.net> writes:

> I traced the problem to epson.c's get_identity2_information() where it
> fails due to an "incorrect" value in the return buffer. My cx5200, along
> other users cx5200s, has 0xb0 (176) in buf[0] which has the most
> significant bit (0x80) set.

You can just remove the if block.  I think it got in there by analogy
of the check_ext_status() function.  There the first byte of the reply
has a bunch of flags in the first byte and 0x80 signals a fatal error.

With the get_identity2_information() the first two bytes hold the
optical resolution (as can be infered from the code, see below).

  /* from get_identity2_information() */
  receive (s, buf, len, &status);	/* reveive actual status data */

  if (buf[0] & 0x80)
  {
    close_scanner (s);
    return SANE_STATUS_INVAL;
  }

  /* the first two bytes of the buffer contain the optical resolution */
  s->hw->optical_res = buf[1] << 8 | buf[0];


# BTW, the epkowa backend does this correctly.

Hope this helps,
-- 
Olaf Meeuwissen                          EPSON AVASYS Corporation, SE1
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