Hello, John, Excuse me, may I ask that PRU can be used beyond linux system clock? Because I need to synchronize my BBB with ourter PTP(precision time protocol) message , if PRU using its clock, then the BBB will become asynchronized device..
Thanks. John Stampfl於 2014年7月17日星期四UTC+8下午11時02分32秒寫道： > > Try the "cycle counter" in the pru. > > look in the pru section of the forum > > > On Thu, Jul 17, 2014 at 10:35 PM, <[email protected] <javascript:>> > wrote: > >> I use BeagleboneBlack with Debian, kernel v3.15, and I want to implement >> an accurate timer on my BBB. >> I use clock_nanosleep() to wait for 1 second. However, it always turns to >> be 1 second and 100~120 microsecond delay. (I measured clock_nanosleep() >> between clock_gettime() and with oscilloscope.) >> >> I also run linuxPTP (a software that adjusts system clock, >> CLOCK_REALTIME, to synchronize linux system with PTP.) to synchronize my >> BBB. >> >> I have no idea how to improve it, should I change linux to real-time >> linux? (Xenomai or RobertCNelson's patch for linux) >> or is there another way (such as software, codes, etc) to get more >> accuracy timer? (under 1us delay.) >> >> Thanks! >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > > > -- > John Stampfl > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
