On 01/30/2010 01:40 PM, stef wrote: > Le jeudi 28 janvier 2010 11:26:56 Chris Berry, vous avez ?crit : > >> No stef im almost certain this isnt a Wolfson, from an old project page >> I think it is an Analog Digital 9826 >> >> Link: >> http://www.analog.com/en/audiovideo-products/cameracamcorder-analog-front-e >> nds/ad9826/products/product.html >> >> >> I too am puzzled why there are so many writes to the frontend, the XP200 >> in the gl686 I think uses an AD frontend and even that only has a few fe >> writes, although the XP200 has separate functions for AD coarse grain >> calibration and AD offset calibration so im not sure if these extra >> writes are done then? Any advice? >> >> Chris >> >> > Hello, > > I had a quick look at the data-sheet. It is coherent with the writes > you see. > One thing that I find strange is that bit 7 of register 0 is set to 1, while > it is recommended no to do so. Maybe it is a bug, or maybe your scanner hasn't > the same exact component. > During calibration there maybe a lots of writes to frontends. To go > further, > I think it could be a good idea to have a test program to does a simple color > scan with a fixed area. You could code directly in it various write to AFE > until you get sensible data. I have appended the main C file and the build > file as a possible example. > I build like this make -DUNIT_TESTING&& make -f mk . > The wm.c is how I experimented with HP3470's AFE. > > Regards, > Stef >
Ok Stef, at the minute I have a separate function in gl841.c that is called during set_fe to skip the standard front end writes in that file and use the ones defined in my function. I have attached the function for you to look at. My question is: is there any benefit to using the method you just recommended over the method im using now? If this function is required it is likely to implemented in the way i have so will it help me much to do what you have asked? Or is what i'm doing pretty similar. Chris -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: set_ad_fe URL: <http://lists.alioth.debian.org/pipermail/sane-devel/attachments/20100130/a9bf9ad8/attachment-0001.asc>
