| Fabrice Gasnier | d895882 | 2017-08-28 12:04:13 +0200 | [diff] [blame] | 1 | What: /sys/bus/iio/devices/iio:deviceX/in_count0_preset |
| 2 | KernelVersion: 4.13 |
| 3 | Contact: fabrice.gasnier@st.com |
| 4 | Description: |
| 5 | Reading returns the current preset value. Writing sets the |
| 6 | preset value. Encoder counts continuously from 0 to preset |
| 7 | value, depending on direction (up/down). |
| 8 | |
| 9 | What: /sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available |
| 10 | KernelVersion: 4.13 |
| 11 | Contact: fabrice.gasnier@st.com |
| 12 | Description: |
| 13 | Reading returns the list possible quadrature modes. |
| 14 | |
| 15 | What: /sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode |
| 16 | KernelVersion: 4.13 |
| 17 | Contact: fabrice.gasnier@st.com |
| 18 | Description: |
| 19 | Configure the device counter quadrature modes: |
| 20 | - non-quadrature: |
| 21 | Encoder IN1 input servers as the count input (up |
| 22 | direction). |
| 23 | - quadrature: |
| 24 | Encoder IN1 and IN2 inputs are mixed to get direction |
| 25 | and count. |
| 26 | |
| 27 | What: /sys/bus/iio/devices/iio:deviceX/in_count_polarity_available |
| 28 | KernelVersion: 4.13 |
| 29 | Contact: fabrice.gasnier@st.com |
| 30 | Description: |
| 31 | Reading returns the list possible active edges. |
| 32 | |
| 33 | What: /sys/bus/iio/devices/iio:deviceX/in_count0_polarity |
| 34 | KernelVersion: 4.13 |
| 35 | Contact: fabrice.gasnier@st.com |
| 36 | Description: |
| 37 | Configure the device encoder/counter active edge: |
| 38 | - rising-edge |
| 39 | - falling-edge |
| 40 | - both-edges |
| 41 | |
| 42 | In non-quadrature mode, device counts up on active edge. |
| 43 | In quadrature mode, encoder counting scenarios are as follows: |
| 44 | ---------------------------------------------------------------- |
| 45 | | Active | Level on | IN1 signal | IN2 signal | |
| 46 | | edge | opposite |------------------------------------------ |
| 47 | | | signal | Rising | Falling | Rising | Falling | |
| 48 | ---------------------------------------------------------------- |
| 49 | | Rising | High -> | Down | - | Up | - | |
| 50 | | edge | Low -> | Up | - | Down | - | |
| 51 | ---------------------------------------------------------------- |
| 52 | | Falling | High -> | - | Up | - | Down | |
| 53 | | edge | Low -> | - | Down | - | Up | |
| 54 | ---------------------------------------------------------------- |
| 55 | | Both | High -> | Down | Up | Up | Down | |
| 56 | | edges | Low -> | Up | Down | Down | Up | |
| 57 | ---------------------------------------------------------------- |