* [Xenomai-help] maximum frequency for parallel port @ 2006-10-19 19:23 Pavel Pirkl 2006-10-19 20:06 ` Hannes Mayer 0 siblings, 1 reply; 3+ messages in thread From: Pavel Pirkl @ 2006-10-19 19:23 UTC (permalink / raw) To: xenomai Hello, I tried example for real time parallel port from www.captain.at. I tried to generate maximum frequency of square waveform only about 10kHz. But for great value of frequency a I got error in rt_wait_period. Where is problem? Pirkl. ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Xenomai-help] maximum frequency for parallel port 2006-10-19 19:23 [Xenomai-help] maximum frequency for parallel port Pavel Pirkl @ 2006-10-19 20:06 ` Hannes Mayer 2006-10-20 12:16 ` Jan Kiszka 0 siblings, 1 reply; 3+ messages in thread From: Hannes Mayer @ 2006-10-19 20:06 UTC (permalink / raw) To: Pavel Pirkl; +Cc: xenomai Pavel Pirkl wrote: > Hello, > I tried example for real time parallel port from www.captain.at. > I tried to generate maximum frequency of square waveform only about 10kHz. > But for great value of frequency a I got error in rt_wait_period. > Where is problem? Which example ? Which error ? Ciao, Capitano ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Xenomai-help] maximum frequency for parallel port 2006-10-19 20:06 ` Hannes Mayer @ 2006-10-20 12:16 ` Jan Kiszka 0 siblings, 0 replies; 3+ messages in thread From: Jan Kiszka @ 2006-10-20 12:16 UTC (permalink / raw) To: Hannes Mayer; +Cc: Pavel Pirkl, xenomai [-- Attachment #1: Type: text/plain, Size: 815 bytes --] Hannes Mayer wrote: > Pavel Pirkl wrote: >> Hello, >> I tried example for real time parallel port from www.captain.at. >> I tried to generate maximum frequency of square waveform only about >> 10kHz. >> But for great value of frequency a I got error in rt_wait_period. >> Where is problem? > > Which example ? > Which error ? Pavel, if you are referring to this example http://www.captain.at/xenomai-parallel-port-interrupt.php it might be wise to raise the thread priorities of the generator and the IRQ handler above the printer. Also, this test was not designed to run at high frequencies. It pushes some value into a pipe for each occurred IRQ and requires main to read from it at the same rate. This will quickly cause overflows of the pipe when going to 10 KHz or higher. Jan [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 250 bytes --] ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2006-10-20 12:16 UTC | newest] Thread overview: 3+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2006-10-19 19:23 [Xenomai-help] maximum frequency for parallel port Pavel Pirkl 2006-10-19 20:06 ` Hannes Mayer 2006-10-20 12:16 ` Jan Kiszka
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