[ntp:questions] Using Trimble TSIP under Linux

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Rob wrote:> Martin Burnicki wrote:
>> Of course, if you are using an USB-to-serial converter
>>  and simply apply the PPS signal via the USB connection
>>  it depends on which time the chip inside the converter
>>  needs to detect the slope and send an appropriate
>>  USB message "DCD changed" to the operating system's driver.
>
> USB-to-serial makes it more complicated, but I'm not sure
>  if it works at all, because gpsd relies on the availability
>  of the TIOCMIWAIT ioctl for the serial device.
>   I think it is not implemented for all USB serial drivers.
> But anyway, the abovementioned restriction also applies in this case.

IIRC the Raspberry pi has a GPIO pin 24 Hard PPS patch,
 so the USB Serial PPS issue can be avoided.

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