diff options
| author |   Michael Hennerich <michael.hennerich@analog.com> | 2011-08-02 08:48:22 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-23 13:37:02 -0700 |
| commit | f94aa354d676532448e8e222e737fdd0755fc786 (patch) | |
| tree | 8492bacbcee0a4b94121dd19653f7cb72f4c1b2e /drivers/staging/iio/Documentation | |
| parent | iio: adc: New driver for AD7280A Lithium Ion Battery Monitoring System (diff) | |
| download | linux-dev-f94aa354d676532448e8e222e737fdd0755fc786.tar.xz linux-dev-f94aa354d676532448e8e222e737fdd0755fc786.zip | |
iio: impedance-analyzer: New driver for AD5933/4 Impedance Converter, Network Analyzer
The AD5933 is a high precision impedance converter system solution
that combines an on-board frequency generator with a 12-bit, 1 MSPS,
analog-to-digital converter (ADC). The frequency generator allows an
external complex impedance to be excited with a known frequency.
The response signal from the impedance is sampled by the on-board ADC
and a discrete Fourier transform (DFT) is processed by an on-chip DSP engine.
The DFT algorithm returns a real (R) and imaginary (I) data-word at each
output frequency.
Changes since V1:
Apply list review feedback:
Consistently use poll_time_jiffies.
Use be|le cpu endian helpers where applicable.
Add various comments.
Changes since V2:
Fix KernelVersion tag in Documentation.
Declare ad5933_default_pdata static.
Fix typos.
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/iio/Documentation')
| -rw-r--r-- | drivers/staging/iio/Documentation/sysfs-bus-iio-impedance-analyzer-ad5933 | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-impedance-analyzer-ad5933 b/drivers/staging/iio/Documentation/sysfs-bus-iio-impedance-analyzer-ad5933 new file mode 100644 index 000000000000..79c7e88c64cd --- /dev/null +++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-impedance-analyzer-ad5933 @@ -0,0 +1,30 @@ +What: /sys/bus/iio/devices/iio:deviceX/outY_freq_start +KernelVersion: 3.1.0 +Contact: linux-iio@vger.kernel.org +Description: + Frequency sweep start frequency in Hz. + +What: /sys/bus/iio/devices/iio:deviceX/outY_freq_increment +KernelVersion: 3.1.0 +Contact: linux-iio@vger.kernel.org +Description: + Frequency increment in Hz (step size) between consecutive + frequency points along the sweep. + +What: /sys/bus/iio/devices/iio:deviceX/outY_freq_points +KernelVersion: 3.1.0 +Contact: linux-iio@vger.kernel.org +Description: + Number of frequency points (steps) in the frequency sweep. + This value, in conjunction with the outY_freq_start and the + outY_freq_increment, determines the frequency sweep range + for the sweep operation. + +What: /sys/bus/iio/devices/iio:deviceX/outY_settling_cycles +KernelVersion: 3.1.0 +Contact: linux-iio@vger.kernel.org +Description: + Number of output excitation cycles (settling time cycles) + that are allowed to pass through the unknown impedance, + after each frequency increment, and before the ADC is triggered + to perform a conversion sequence of the response signal. |