changes in comedi cvs

Hi Frank,

thank you so much again for your invaluable help in getting comedi to
work with our 611x boards. I hope you had a pleasant trip back to the
US.

I notice that your recent changes (2002/11/19) in the DMA underrun
detection result in "DMA underrun" errors being triggered for all but
ridiculously low conversion frequencies (100 Hz or so). What typically
happens is that nbytes (from mite_bytes_read) is a bit larger than
devpriv->last_buf_write_count, whereas the latter is always 8192, the
former is something like 8212, 8216, 8248, 8252. However, with the
pre-2002/11/19 I do not see any hick-ups in the waveform that would
indicate a problem.

It also appears to me that the ai-munging is not done correctly or
consistently, signed numbers seem to be treated as unsigned, this does
not seem to be a problem of the user application, because it occurs
with cmd and ktimetrace likewise.

Best wishes,
Rolf

-- 
Rolf Mueller, rolf.mueller_at_uni-tuebingen.de
Biosonar Lab, Tuebingen University,
Morgenstelle 28, 72076 Tuebingen
Phone +49 7071 29-74838  Fax. +49 7071 292618

Received on 2002-11-22Z16:38:50