| What: /sys/bus/iio/devices/iio:deviceX/in_count_count_mode_available |
| What: /sys/bus/iio/devices/iio:deviceX/in_count_noise_error_available |
| What: /sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available |
| What: /sys/bus/iio/devices/iio:deviceX/in_index_index_polarity_available |
| What: /sys/bus/iio/devices/iio:deviceX/in_index_synchronous_mode_available |
| KernelVersion: 4.10 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| Discrete set of available values for the respective counter |
| configuration are listed in this file. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_countY_count_mode |
| KernelVersion: 4.10 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| Count mode for channel Y. Four count modes are available: |
| normal, range limit, non-recycle, and modulo-n. The preset value |
| for channel Y is used by the count mode where required. |
| |
| Normal: |
| Counting is continuous in either direction. |
| |
| Range Limit: |
| An upper or lower limit is set, mimicking limit switches |
| in the mechanical counterpart. The upper limit is set to |
| the preset value, while the lower limit is set to 0. The |
| counter freezes at count = preset when counting up, and |
| at count = 0 when counting down. At either of these |
| limits, the counting is resumed only when the count |
| direction is reversed. |
| |
| Non-recycle: |
| Counter is disabled whenever a 24-bit count overflow or |
| underflow takes place. The counter is re-enabled when a |
| new count value is loaded to the counter via a preset |
| operation or write to raw. |
| |
| Modulo-N: |
| A count boundary is set between 0 and the preset value. |
| The counter is reset to 0 at count = preset when |
| counting up, while the counter is set to the preset |
| value at count = 0 when counting down; the counter does |
| not freeze at the bundary points, but counts |
| continuously throughout. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_countY_noise_error |
| KernelVersion: 4.10 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| Read-only attribute that indicates whether excessive noise is |
| present at the channel Y count inputs in quadrature clock mode; |
| irrelevant in non-quadrature clock mode. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_countY_preset |
| KernelVersion: 4.10 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| If the counter device supports preset registers, the preset |
| count for channel Y is provided by this attribute. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_countY_quadrature_mode |
| KernelVersion: 4.10 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| Configure channel Y counter for non-quadrature or quadrature |
| clock mode. Selecting non-quadrature clock mode will disable |
| synchronous load mode. In quadrature clock mode, the channel Y |
| scale attribute selects the encoder phase division (scale of 1 |
| selects full-cycle, scale of 0.5 selects half-cycle, scale of |
| 0.25 selects quarter-cycle) processed by the channel Y counter. |
| |
| Non-quadrature: |
| The filter and decoder circuit are bypassed. Encoder A |
| input serves as the count input and B as the UP/DOWN |
| direction control input, with B = 1 selecting UP Count |
| mode and B = 0 selecting Down Count mode. |
| |
| Quadrature: |
| Encoder A and B inputs are digitally filtered and |
| decoded for UP/DN clock. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_countY_set_to_preset_on_index |
| KernelVersion: 4.10 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| Whether to set channel Y counter with channel Y preset value |
| when channel Y index input is active, or continuously count. |
| Valid attribute values are boolean. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_indexY_index_polarity |
| KernelVersion: 4.10 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| Active level of channel Y index input; irrelevant in |
| non-synchronous load mode. |
| |
| What: /sys/bus/iio/devices/iio:deviceX/in_indexY_synchronous_mode |
| KernelVersion: 4.10 |
| Contact: linux-iio@vger.kernel.org |
| Description: |
| Configure channel Y counter for non-synchronous or synchronous |
| load mode. Synchronous load mode cannot be selected in |
| non-quadrature clock mode. |
| |
| Non-synchronous: |
| A logic low level is the active level at this index |
| input. The index function (as enabled via |
| set_to_preset_on_index) is performed directly on the |
| active level of the index input. |
| |
| Synchronous: |
| Intended for interfacing with encoder Index output in |
| quadrature clock mode. The active level is configured |
| via index_polarity. The index function (as enabled via |
| set_to_preset_on_index) is performed synchronously with |
| the quadrature clock on the active level of the index |
| input. |