What: /sys/bus/counter/devices/counterX/countY/count KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Count data of Count Y represented as a string. What: /sys/bus/counter/devices/counterX/countY/ceiling KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Count value ceiling for Count Y. This is the upper limit for the respective counter. What: /sys/bus/counter/devices/counterX/countY/floor KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Count value floor for Count Y. This is the lower limit for the respective counter. What: /sys/bus/counter/devices/counterX/countY/count_mode KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Count mode for channel Y. The ceiling and floor values for Count Y are used by the count mode where required. The following count modes are available: 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 Count Y ceiling value, while the lower limit is set to the Count Y floor value. The counter freezes at count = ceiling when counting up, and at count = floor when counting down. At either of these limits, the counting is resumed only when the count direction is reversed. non-recycle: The counter is disabled whenever a counter 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 direct write. modulo-n: A count value boundary is set between the Count Y floor value and the Count Y ceiling value. The counter is reset to the Count Y floor value at count = ceiling when counting up, while the counter is set to the Count Y ceiling value at count = floor when counting down; the counter does not freeze at the boundary points, but counts continuously throughout. What: /sys/bus/counter/devices/counterX/countY/count_mode_available What: /sys/bus/counter/devices/counterX/countY/error_noise_available What: /sys/bus/counter/devices/counterX/countY/function_available What: /sys/bus/counter/devices/counterX/countY/prescaler_available What: /sys/bus/counter/devices/counterX/countY/signalZ_action_available KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Discrete set of available values for the respective Count Y configuration are listed in this file. Values are delimited by newline characters. What: /sys/bus/counter/devices/counterX/countY/direction KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Read-only attribute that indicates the count direction of Count Y. Two count directions are available: forward and backward. Some counter devices are able to determine the direction of their counting. For example, quadrature encoding counters can determine the direction of movement by evaluating the leading phase of the respective A and B quadrature encoding signals. This attribute exposes such count directions. What: /sys/bus/counter/devices/counterX/countY/enable KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Whether channel Y counter is enabled. Valid attribute values are boolean. This attribute is intended to serve as a pause/unpause mechanism for Count Y. Suppose a counter device is used to count the total movement of a conveyor belt: this attribute allows an operator to temporarily pause the counter, service the conveyor belt, and then finally unpause the counter to continue where it had left off. What: /sys/bus/counter/devices/counterX/countY/error_noise KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Read-only attribute that indicates whether excessive noise is present at the channel Y counter inputs. What: /sys/bus/counter/devices/counterX/countY/function KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Count function mode of Count Y; count function evaluation is triggered by conditions specified by the Count Y signalZ_action attributes. The following count functions are available: increase: Accumulated count is incremented. decrease: Accumulated count is decremented. pulse-direction: Rising edges on signal A updates the respective count. The input level of signal B determines direction. quadrature x1 a: If direction is forward, rising edges on quadrature pair signal A updates the respective count; if the direction is backward, falling edges on quadrature pair signal A updates the respective count. Quadrature encoding determines the direction. quadrature x1 b: If direction is forward, rising edges on quadrature pair signal B updates the respective count; if the direction is backward, falling edges on quadrature pair signal B updates the respective count. Quadrature encoding determines the direction. quadrature x2 a: Any state transition on quadrature pair signal A updates the respective count. Quadrature encoding determines the direction. quadrature x2 b: Any state transition on quadrature pair signal B updates the respective count. Quadrature encoding determines the direction. quadrature x4: Any state transition on either quadrature pair signals updates the respective count. Quadrature encoding determines the direction. What: /sys/bus/counter/devices/counterX/countY/name KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Read-only attribute that indicates the device-specific name of Count Y. If possible, this should match the name of the respective channel as it appears in the device datasheet. What: /sys/bus/counter/devices/counterX/countY/prescaler KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Configure the prescaler value associated with Count Y. On the FlexTimer, the counter clock source passes through a prescaler (i.e. a counter). This acts like a clock divider. What: /sys/bus/counter/devices/counterX/countY/preset KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: If the counter device supports preset registers -- registers used to load counter channels to a set count upon device-defined preset operation trigger events -- the preset count for channel Y is provided by this attribute. What: /sys/bus/counter/devices/counterX/countY/preset_enable KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Whether channel Y counter preset operation is enabled. Valid attribute values are boolean. What: /sys/bus/counter/devices/counterX/countY/signalZ_action KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Action mode of Count Y for Signal Z. This attribute indicates the condition of Signal Z that triggers the count function evaluation for Count Y. The following action modes are available: none: Signal does not trigger the count function. In Pulse-Direction count function mode, this Signal is evaluated as Direction. rising edge: Low state transitions to high state. falling edge: High state transitions to low state. both edges: Any state transition. What: /sys/bus/counter/devices/counterX/countY/spike_filter_ns KernelVersion: 5.14 Contact: linux-iio@vger.kernel.org Description: If the counter device supports programmable spike filter this attribute indicates the value in nanoseconds where noise pulses shorter or equal to configured value are ignored. Value 0 means filter is disabled. What: /sys/bus/counter/devices/counterX/name KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Read-only attribute that indicates the device-specific name of the Counter. This should match the name of the device as it appears in its respective datasheet. What: /sys/bus/counter/devices/counterX/num_counts KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Read-only attribute that indicates the total number of Counts belonging to the Counter. What: /sys/bus/counter/devices/counterX/num_signals KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Read-only attribute that indicates the total number of Signals belonging to the Counter. What: /sys/bus/counter/devices/counterX/signalY/cable_fault KernelVersion: 5.7 Contact: linux-iio@vger.kernel.org Description: Read-only attribute that indicates whether a differential encoder cable fault (not connected or loose wires) is detected for the respective channel of Signal Y. Valid attribute values are boolean. Detection must first be enabled via the corresponding cable_fault_enable attribute. What: /sys/bus/counter/devices/counterX/signalY/cable_fault_enable KernelVersion: 5.7 Contact: linux-iio@vger.kernel.org Description: Whether detection of differential encoder cable faults for the respective channel of Signal Y is enabled. Valid attribute values are boolean. What: /sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler KernelVersion: 5.7 Contact: linux-iio@vger.kernel.org Description: Filter clock factor for input Signal Y. This prescaler value affects the inputs of both quadrature pair signals. What: /sys/bus/counter/devices/counterX/signalY/index_polarity KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Active level of index input Signal Y; irrelevant in non-synchronous load mode. What: /sys/bus/counter/devices/counterX/signalY/index_polarity_available What: /sys/bus/counter/devices/counterX/signalY/synchronous_mode_available KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Discrete set of available values for the respective Signal Y configuration are listed in this file. What: /sys/bus/counter/devices/counterX/signalY/name KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Read-only attribute that indicates the device-specific name of Signal Y. If possible, this should match the name of the respective signal as it appears in the device datasheet. What: /sys/bus/counter/devices/counterX/signalY/signal KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Signal data of Signal Y represented as a string. What: /sys/bus/counter/devices/counterX/signalY/synchronous_mode KernelVersion: 5.2 Contact: linux-iio@vger.kernel.org Description: Configure the counter associated with Signal Y for non-synchronous or synchronous load mode. Synchronous load mode cannot be selected in non-quadrature (Pulse-Direction) clock mode. non-synchronous: A logic low level is the active level at this index input. The index function (as enabled via preset_enable) 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 preset_enable) is performed synchronously with the quadrature clock on the active level of the index input.