On Thu, 2004-09-09 at 10:05, Dominic Evans wrote:
> The 2.6 Kernel code might be interesting, especially as there are
> numerous posts on here regarding people willing to try and port the
> isp116x code to 2.6.x. I'm not aware how much the usb code has changed
> between 2.4.x -> 2.6.x but I am guessing it cannot be too extensive
> changes required, nor should it be difficult to work by comparing diffs
> of already ported drivers.
I will send it to you in private mail.
> >> Also, if you have any queries about the USB hardware etc on the VIPER
> please don't hesitate to ask.
>
> What is the interrupt trigger source for the isp116x on the Viper? (i.e.
> is it set up to be edge or level triggered)
It's IRQ 25 (GPIO 2) and the HcHardwareConfig used in the 2.4 driver is
InterruptOutputPolarity|InterruptPinTrigger|DataBusWidth16|DREQOutputPolarity|DownstreamPort15KRSel|AnalogOCEnable
I make that active high, edge triggered. The GPIO line is setup as
GPIO_BOTH_EDGES in arch/arm/mach-pxa/viper.c. You could probably just
make that one edge or the other, or even try for level triggered.
> Could you also tell me which webcams you have tried with it? The pwc
> driver with phillips/logitech seems to be the most common (and is what
> I'm attempting to get working) but it would be interesting to see if any
> others have been tried.
I've tried a pwc and a ov511, neither worked. I've also tried the
boundary isp116x driver, the original roman one and the tango one.
> Also do you have any comment on this:
>
> // this chip (isp116x) gives a pulse of 167ns on the interrupt, pxa250
> requires 1000ns
>
> As I cannot find this requirement documented anywhere in the publicly
> available docs I was wondering if you had any better information?
I vaguely remember this, although it was quite some time ago that I
worked out the interrupt setup for ISP116x on the VIPER so my memory is
entirely fuzzy. Perhaps this is why I chose to use edge rather than
level triggered interrupts. I know that with the above configuration
interrupts are received and I suspect that at the time I decided this
was good enough for now, I don't think interrupts are being missed or
anything like that...
Ian.
--
Ian Campbell, Senior Design Engineer
Web: http://www.arcom.com
Arcom, Clifton Road, Direct: +44 (0)1223 403 465
Cambridge CB1 7EA, United Kingdom Phone: +44 (0)1223 411 200
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