On Fri, Jan 19, 2001 at 09:29:00PM +0100, Slawek Kolasinski wrote:
> I would like to write a backend for Mustek BearPaw 2400 on USB -
> if no one else is already working on it.
I'm writing a backend for the Bearpaw 1200. As the Scanners are
probably quite similar (9831 versus 9832) they can be supported by one
backend. At the moment I can read and write registers, turn on the
lamp, move the slider and reset the scanner. All this seems to work
for the 2400, too, as far as I can tell from the first tests. I will
email you more information and my code.
Some documentation about the chip is at
> I read some docs and I also looked through some backends sources. I
> can't understand one thing. How can I send some configuration data to
> my scanner using only the special file /dev/usb/scanner0? I mean that
> my scanner has 127 registers and I have to choose somehow which
> register I want to read/write.
For some reason this isn't explained in the documentation of the
National Semiconductor Merlin 9831/9832 chip. At least I couldn't find
it. It's simple (copied from my mail a few days ago:)
You need just simple reads and writes to the /dev/usbscanner or
Byte 0: read (1) or write (0). Use incremental write/read: add 2.
Byte 1: register number
Byte 2: bytes to write/read MSB
Byte 3: bytes to write/read LSB
For a write just add the buffer you want to send (e.g. for writing to
one register, you would have 5 bytes total). For a read, write the
four bytes and read as many bytes as specified after that.
> I figured out that ESCape (0x1B)
> character has samoe special meaning because it's always sent as the
> first byte - how does it work? Could someone answer me?
That maybe correct for the HP scanners. For the Bearpaw 2400 and 1200
it doesn't have a special meaning. By the way, the Bearpaw 1200F seems
to be a completely different scanner, it uses a chip named "Mustek
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