Thank you for the information - I noticed others used the mmap instead of
sysfs and I wondered how much overhead was in the read/write/open
functions. Can I ask what logic analyzer you're using? I've been itching
to get an oscilloscope, but even the cheapest is a few hundred.
Regards,
Rene
On Friday, July 18, 2014 3:56:41 AM UTC+10, rar76 wrote:
Thank you for the information - I noticed others used the mmap instead of
sysfs and I wondered how much overhead was in the read/write/open
functions. Can I ask what logic analyzer you're using? I've been itching
to get an
Sudhir, do you know what the problem was with the Pin? I have the same problem
that poll is not blocking.
Therefor to know why would be great.
Web,
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How are you counting your pulses? If you are firing interrupts faster
than you can service them then you will be missing interrupts. There are
only 2 ways to get faster interrupts on the beaglebone than what your
are doing now and that is by either writing a kernel driver, to avoid
the latency in
Hi Jack,
I apologize if my previous reply came across as rude. Let me be more humble
and do proper homework before posting from now on :-)
I didn't have the time to work on this till now. You were right in pointing
out usage of POLLPRI instead of POLLIN. I had tried both earlier and it did
Hi Jack,
Thanks for the help!. I looked at your library and it appears that you are
using poll(2) as well which is similar to the example I am trying to use in
the original post.
There are two things I want to mention
1. Latency : I came across somewhere that poll() by itself introduces
Hi Sudhir,
If you are not well versed in Linux and C then the speed of your own
code will be no faster than using my library with debugging disabled I
imagine.
Without looking seriously at your code there are two things I want to say.
1) You should be using POLLPRI - look at my library for
Sudhir,
If you don't object to using a library there is libsoc[1] which is made
for this exact purpose.
https://github.com/jackmitch/libsoc
Cheers,
Jack.
On 18/10/2013 17:31, sudhir v wrote:
Hi,
I want to monitor a pin on BBB for interrupt. I chose pin 117 (pin 25 on
P9 - GPIO3_21 =
