Hi, On Sun, Feb 03, 2002 at 12:11:28PM +0300, Max Ushakov wrote: > The ``strange part'' 6 looks like this: > > READ with DT=0x80 and DTQ=0, 61056 bytes > READ with DT=0x80 and DTQ=0, 0 bytes > > READ with DT=0x82 and DTQ=0x10, 7650 bytes > (repeats 15 times) > SEND with DT=0x82 and DTQ=0x01, 7650 bytes > > The data sent and received had little meaning to me -- it > contained a block of bytes near to 0xff in one place and a block > of bytes near to 0x3c in another. > > What could this be?
Maybe some sort of calibration? The Mustek flatbed scanners do a similar thing. First scan some lines of a (mostly) white strip and send it to the driver. The driver then calculates a value describing the loss/gain for every ccd sensor element to compensate for slight differences in the sensitivity of these elements. There is also a black stripe at the begiining of the white stripe (ca 3mm), which is for calibrating the black point. Bye, Henning
