[Linux time stamping]

This code will get time since epoch with nanosecond resolution. You can convert to milliseconds and round first if you want.

 

struct timespec start;
clock_gettime( CLOCK_REALTIME, &start);
return(start.tv_sec+start.tv_nsec/1000000000.0);

 

It should be added to the NTP app note soon.

 

Thanks used this code but it locked up system if it is run on every plc cycle

 

struct timeval MyTimeVal;

gettimeofday(&MyTimeVal, NULL);

 

Which code would be best in your opinion.

 

Regards

Steven

[Linux time stamping]

You might want to refer to this thread:

 

http://forums.deltatau.com/showthread.php?tid=2518&highlight=NTP

 

Sorry I have already passed the stage of getting time synchronised to a master clock.

Since my last post I have also got system time from the Linux operating system using C code, thank you for replying anyway.

 

Regards

Steven

[Linux time stamping]

I have been working on capturing encoder positions and logging it relative to real world UTC time.

I have the Linux operating system synced to a ptp time source but the only access to this time I have found is the C++ code "time()" which give time as an integer in seconds, is there a method to get sub second time from within C code, I am looking for at least millisecond resolution anything better would be a plus.

I have already tried to use "ftime()" but found it crashed the system.

any help here would be appreciated.

 

Regards

Steven