1 What: /sys/bus/iio/devices/iio:devic 1 What: /sys/bus/iio/devices/iio:deviceX/in_voltage-voltage_filter_mode_available
2 KernelVersion: 6.2 2 KernelVersion: 6.2
3 Contact: linux-iio@vger.kernel.org 3 Contact: linux-iio@vger.kernel.org
4 Description: 4 Description:
5 Reading returns a list with th 5 Reading returns a list with the possible filter modes.
6 6
7 * "sinc4" - Sinc 4. Ex 7 * "sinc4" - Sinc 4. Excellent noise performance. Long
8 1st conversion time. No na 8 1st conversion time. No natural 50/60Hz rejection.
9 9
10 * "sinc4+sinc1" - Sinc4 + av 10 * "sinc4+sinc1" - Sinc4 + averaging by 8. Low 1st conversion
11 time. 11 time.
12 12
13 * "sinc3" - Sinc3. 13 * "sinc3" - Sinc3. Moderate 1st conversion time.
14 Good noise performance. 14 Good noise performance.
15 15
16 * "sinc3+rej60" - Sinc3 + 60 16 * "sinc3+rej60" - Sinc3 + 60Hz rejection. At a sampling
17 frequency of 50Hz, achieve 17 frequency of 50Hz, achieves simultaneous 50Hz and 60Hz
18 rejection. 18 rejection.
19 19
20 * "sinc3+sinc1" - Sinc3 + av 20 * "sinc3+sinc1" - Sinc3 + averaging by 8. Low 1st conversion
21 time. Best used with a sam 21 time. Best used with a sampling frequency of at least
22 216.19Hz. 22 216.19Hz.
23 23
24 * "sinc3+pf1" - Sinc3 + Po 24 * "sinc3+pf1" - Sinc3 + Post Filter 1. 53dB rejection @
25 50Hz, 58dB rejection @ 60H 25 50Hz, 58dB rejection @ 60Hz.
26 26
27 * "sinc3+pf2" - Sinc3 + Po 27 * "sinc3+pf2" - Sinc3 + Post Filter 2. 70dB rejection @
28 50Hz, 70dB rejection @ 60H 28 50Hz, 70dB rejection @ 60Hz.
29 29
30 * "sinc3+pf3" - Sinc3 + Po 30 * "sinc3+pf3" - Sinc3 + Post Filter 3. 99dB rejection @
31 50Hz, 103dB rejection @ 60 31 50Hz, 103dB rejection @ 60Hz.
32 32
33 * "sinc3+pf4" - Sinc3 + Po 33 * "sinc3+pf4" - Sinc3 + Post Filter 4. 103dB rejection @
34 50Hz, 109dB rejection @ 60 34 50Hz, 109dB rejection @ 60Hz.
35 35
36 What: /sys/bus/iio/devices/iio:devic 36 What: /sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_filter_mode
37 KernelVersion: 6.2 37 KernelVersion: 6.2
38 Contact: linux-iio@vger.kernel.org 38 Contact: linux-iio@vger.kernel.org
39 Description: 39 Description:
40 Set the filter mode of the dif 40 Set the filter mode of the differential channel. When the filter
41 mode changes, the in_voltageY- 41 mode changes, the in_voltageY-voltageZ_sampling_frequency and
42 in_voltageY-voltageZ_sampling_ 42 in_voltageY-voltageZ_sampling_frequency_available attributes
43 might also change to accommoda 43 might also change to accommodate the new filter mode.
44 If the current sampling freque 44 If the current sampling frequency is out of range for the new
45 filter mode, the sampling freq 45 filter mode, the sampling frequency will be changed to the
46 closest valid one. 46 closest valid one.
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