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ADI IIO trigger AD7768-1


I'm working on a zedboard-AD7768-1 project.  I've seen that the single-shot acquisition via /sys/bus/iio/devices/iio:device0/in_voltage0_raw is working.  I would like to get the buffered readings.  Almost all literature I've read about buffered reading talks about triggers and how to use it.  I've also seen the AD7768-1 Linux driver page ( having its trigger management section.  The problem is, there is no trigger file inside my AD7768-1's sysfs directory:

And so I can't really follow that section.  How can I access the buffer instead?  Is there other ways to use the trigger?  Just want to know, since AD7768-1's driver source apparently supports triggering.  I'm using 2019_R2 versions for my meta-adi as well as HDL.