I’m trying to write a driver for the
device, just as a learning exercise. So far, I’ve got the firmware in intel hex
format (from usbsnoop on windows, then a couple perl scripts to mutate it) and
am able to use fxload to load it with –t fx2 and there are 2 separate files, a
short one (the loader) and the firmware proper; so in fxload I have a –s and a
–I.
I’m able to take it from cold to
warm that way solely within Linux.
The device itself has a cypress CY7C68013A fx2 chip and a large tin can
tuner/demod stamped with
Thomson that has a sticker on it identifying it as 8601A. Helpfully, the 3560
opens up easily with the removal of two screws on the shell.
It’s cold boot usb id is 14f3:3560 and its warm boot is
14f3:a560.
I have taken that hex file and
created a binary file out of the 2nd file (-I in fxload speak). I
think, correct me if I’m wrong, there is already a fx2 loader available, thus I
will not need the loader file.
One of the stranger things I saw in
the usbsnoop trace in windows was when it came to reset of the CPUCS, the
driver
sent down both a poke at x0e600 and a poke at 0x7f92. One is the fx CPUCS
register, I believe the other is a fx2 CPUCS register.
Currently I am mutating dibusb-mc
just to see if I can get it to the point of going from cold to warm in the
driver.
I have taken usb sniffs from windows
of doing things such as scanning for channels, watching a channel, etc. so I
can
try to figure out if anything else in the v4l-dvb collection behaves
similarly.
I guess what I’m looking for is any
hints that might be useful to figuring this out.
Like I said, it’s a learning
exercise, I already have enough tuners, and anyway, the cost of buying a
supported tuner is far cheaper than the time needed to develop
this!
Thanks for any info! I’ve pretty
much devoured everything available on the wiki.
Amy
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