Re: [gpsd-dev] Problem with PPS detection - using Centos 7 and gpsd dev-3.19a

[Hal Murray]

There are two ways to process PPS info.

There is the kernel mode PPS processing.  Basically, the kernel grabs a time 
stamp at interrupt time when DCD changes.  There is an RFC describing the API 
to get that info.

There is also an IOCTL to wake up a user process on DCD changes.  User code 
can then grab a time stamp.

I suspect your driver is missing a few lines of code to support one or the 
other.  You can probably find it by comparing with a known-good driver.



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