[sane-devel] USB recordings MD6190 available

[Lauri Pirttiaho]

>Lauri Pirttiaho on Mon Sep 26 18:25:44 UTC 2005 
>>Bertrik Sikken on Sun Sep 25 20:35:55 UTC 2005
>>>Lauri Pirttiaho wrote:
>>> -- There is some kind of clocked serial device connecter to processor
>>>    port 0 bits 5-7 -- it may be an EEPROM but maybe also something else.
>>
>>Wow, you opened up the device and attached a 'scope?
>
>Too expensive... :) I just read the code.

That serial device is the Wolfson WM8169 CCD digitiser mentioned
in Martin's www page
http://mibix.de/wiki/index.php/MD6190_Hardware.

The protocol matches with my findings from the firmware
(compare WM8196 data sheet, link on Martin's page):
************************************************************************
* Write out 14 bits of data to some clocked serial device:
* Input R7 bits 5 and 3:0
*       R5 bits 7:0
* Output, possibly R4 which contains copy of R5 at the end
*
* Set port 1 bits 5 and 7 low
* Write to port 1 bit 6 (data) the following bits in that order
*   and then toggle high/low port 1 bit 7 (clock):
*   R7[5] 0 R7[3:0] R5[7:0]
* Then toggle high/low port 1 bit 5 (end)
************************************************************************

With best regards,

Lauri Pirttiaho
Oulu
Finland


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