Re: sc16is7xx / max310x device tree irq question

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> Hi Maarten
> 
> I think you are missing the required 1kohm resistor on your irq line :-)
> 
> /Sean

Hello Sean,

You're right, I don't have 1k. Instead I have the weak internal pull up of the
raspberry pi enabled, which gives ~50k. If 1k should solve it, then 50k should
give me max ~50 spurious interrupts. Instead I see 150.000.

And according to this page
http://www.mosaic-industries.com/embedded-systems/microcontroller-projects/raspberry-pi/gpio-pin-electrical-specifications#tab1
the raspberry pi input should even have hysteresis which means a slow rising
signal should not generate bounce-like behavior. I can only hope the hysteresis
is enabled when the pin is configured for interrupt.

I am not convinced this is the problem.

Maarten
--
To unsubscribe from this list: send the line "unsubscribe linux-serial" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux PPP]     [Linux FS]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Linmodem]     [Device Mapper]     [Linux Kernel for ARM]

  Powered by Linux