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From: William Huang <whuang8933@gmail.com>
To: linux-iio@vger.kernel.org
Subject: Can't find trigger_now for sysfs-based triggering
Date: Sat, 12 Jun 2021 12:43:12 -0400	[thread overview]
Message-ID: <CADa-vC0c4_0XiLd6GQto6f0h2BZi0CvWiP7v9NTjG9cgXTGoLw@mail.gmail.com> (raw)

Hi everyone,

I hope this is the right place to ask my noob question.
I'm trying to learn how to write an IIO driver and using a couple
books as my resource. I managed to write a simple one and perform
oneshot-based data reads (e.g. cat iio:device0/in_temp_raw).

Now, I'm trying to set up a trigger-buffered data read. I believe I
set up the triggers correctly:
cat trigger0/name > iio:device0/trigger/current_trigger
echo 1 > iio:device0/scan_elements/in_temp_en
echo 1 > iio:device0/buffer/enable
cat /dev/iio\:device0 | xxd -

Now, I'm not understanding how I should actually perform the trigger.
From my books, there should be a trigger_now file where I can echo 1
to trigger, but it's not available in my trigger0/ directory. Also,
the book references a add_trigger in /sys/devices/iio_sysfs_trigger/
directory, but that's nowhere to be found as well.

My .config also has CONFIG_IIO_SYSFS_TRIGGER=m.

Any help/advice would be appreciated!

Thanks,
William Huang

next             reply	other threads:[~2021-06-12 16:44 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-12 16:43 William Huang [this message]
2021-06-13 11:18 ` Can't find trigger_now for sysfs-based triggering Jonathan Cameron

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