[LinuxPPS] Debugging the pps

[Marc Leclerc]

Hi,

I did the check and we do get the interrupt on IRQ3 every second with 
the Rx/Tx deconnected from the gps. still no log pass the PPS line 
discipline registered. still no entry in /sys/class/pps/.

I would hope that with debugging output enabled there would be sing of 
life... or death.

Any other suggestions or next step woudl be appreciated

Thanks

On 04/26/2011 07:16 PM, Bernhard Schiffner wrote:
> Am Dienstag, 26. April 2011, 21:25:16 schrieb Marc Leclerc:
>> Hi,
>>
>> I have moved to a new board x86 based and compiled kernel 2.6.34.7 with
>> pps support + line discipline. I have a gps module hooked to ttyS1 + the
>> pps to pin 1 DCD. We checked the pps signal with a scope and it does get
>> to the pin.
> First: Is this real RS232 level or some "pseudo" (5V, 3.3V)?
> Second: Is the pulse long enough to be catched by interrupt controllers
> (>70µs)?
>
> Next: A 8250 (or similar) interrupts on DCD-change. Do you see "advance" of
> the according interrupt in /proc/interrupts while RxD is disconnected?
> ( pps / line_discipline is a level above that.)
>
>> when the kernel boots I do see the message that pps line
>> discipline is registered. I did create the pps device + links for ntp.
>> as for the gps it does work ok with ntp.
> So this part seems ok.
>
>> problem is there is no sign of
>> pps at all. the /sys/class/pps is empty and there are no messages
>> appering in the logs (dmesg) that the pps is doing anything beside being
>> registered.
> What hardware / kernelmodul (*.ko) do you speak about?
> I'am not quite sure, if pps is implemented for all "freaky" serial drivers.
> 8250/16550 should work.
>
>> I have also enabled debugging support but no further sign.
>> Also tried the patch for kernel consumer. Any clue on the steps I could
>> take to find what's wrong.
>>
>> Regards
>>
> Hope it helps to make you sure about "hardware" first.
>
>
> Bernhard
>
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