[ntp:questions] Using Trimble TSIP under Linux
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Wed Oct 31 21:58:56 UTC 2012
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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