Hi, Theodore Kilgore wrote: > > On Sat, 30 Jan 2010, Németh Márton wrote: > >> Hi, >> >> if anyone interested there is a brief overview datasheet about >> PixArt PAC7301/PAC7302 at >> http://www.pixart.com.tw/upload/PAC7301_7302%20%20Spec%20V1_20091228174030.pdf > > [...] > > Now, as to the substance of the mail above, thanks a lot. I had a bunch of > the PixArt datasheets already, but I had missed that one. I would have a > question, though: > > This datasheet gives a lot of information about pinouts on the sensor chip > and such good stuff which might be useful if one were constructing a > circuit board on which to put the chip. What it does not give, very > unfortunately, is any information about the command set which needs to be > sent across the USB connection, which in turn actuates the circuits which > in turn sends something to the sensor across one of those pins. For > example, to set green gain one has to do something on connector X. But how > does one send a command from the computer which does something on > connector X? Some other datasheets from some other companies (Omnivision, > for example) do seem occasionally to provide such information. > > Thus, a question for you or for anyone else who reads it: > > Has anyone figured out any shortcuts for matching up the missing pieces of > information? Probably the answer is "no" but I think this is the kind of > question which is worth asking again on some periodic basis. I have created some notes about my experiments, but they are only based on trial-and-error. I started to created a PixArt PAC7301/PAC7302 Wiki page this morning but the communication protocol details I could found out is not yet finished. The page can be found at http://linuxtv.org/wiki/index.php/PixArt_PAC7301/PAC7302 . I hope I'll have the time to add a section about the communication protocol details I could find out from the current gspca_pac7302 driver source code and my experiments. Regards, Márton Németh -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
