DMA buffers may have an alignment requirement for the buffer length. In the case ofĪn input buffer, this indicates the amount of data available for In the case of an output buffer, this indicates theĪmount of empty space available to write data to. The available samples after the timeout expires and thus have aĪ read-only value indicating the bytes of data available in theīuffer. ThisĪllows the application to block on poll with a timeout and read Non-blocking read will retrieve the available samples from theīuffer even if there are less samples then watermark level. Read amount or the low water mark is available. Poll will block until the watermark is reached.īlocking read will wait until the minimum between the requested This file should be written last, after length and selection of scan elements.Ī single positive integer specifying the maximum number of scan Get/set the number of sample sets that may be held by the buffer.Įnables/disables the buffer.
Called deviceX:bufferY, where Y defaults to 0, for devices with a single buffer.Įvery buffer implementation features a set of files: One is the IIO lock free software ring, and the other is based on Linux kfifo.ĭevices with buffer support feature an additional sub-folder in the /sys/bus/iio/devices/deviceX/ folder hierarchy. The Industrial I/O subsystem provides support for various ring buffer based data acquisition methods.Īpart from device specific hardware buffer support, the user can chose between two different software ring buffer implementations. Lrwxrwxrwx 1 root root 0 Jan 1 21:48 subsystem ->. rw-r-r- 1 root root 4096 Jan 1 21:48 out_voltage0_settling_cyclesĭrwxr-xr-x 2 root root 0 Jan 1 21:48 power r-r-r- 1 root root 4096 Jan 1 21:48 out_voltage0_scale_available rw-r-r- 1 root root 4096 Jan 1 21:48 out_voltage0_freq_start rw-r-r- 1 root root 4096 Jan 1 21:48 out_voltage0_freq_points rw-r-r- 1 root root 4096 Jan 1 21:48 out_voltage0_freq_increment r-r-r- 1 root root 4096 Jan 1 21:48 in_voltage0_scale_available
Root:/sys/bus/iio/devices/iio:deviceX> ls -lĭrwxr-xr-x 4 root root 0 Jan 1 21:48 buffer Root:/sys/bus/iio/devices> cd iio:device0 This specifies any shell prompt running on the target
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