Re: [Gumstix-users] SPI PNI Driver Kernel Panic

[Tuomas K. <tu...@ku...>]

Dave Hylands wrote:

> Pin configuration is normally not done by the drivers, but rather by
> the chip intialization. They do this so the drivers stay generic and
> don't get filled with lots of chip specific hacks. Consider that the
> same SPI driver may work on many different chips, even different
> architectures of chips.

Makes sense. And it's mentioned in the wiki but I just missed it..

> I not at all familiar with the driver, but this sounds like some type

http://docwiki.gumstix.org/index.php/Pni11096_spi.c

> of spurious interrupts are happening. This can happen with bad
> grounds, or long wires connecting to your device. Ringing on the lines
> can make single edges appear like multiple edges and cause lots of
> weird things to happen.

My wires are something like 15 cm long and far from being good quality.
Now that I got something working I'll probably need to solder something
better.

Ringing?

I got some sense to the numbers from the PNI by switching the mode to
binary. But I guess those spurious interrupts messes up the 16bit numbers.


Thanks,
-- 
Tuomas