1What: /sys/bus/counter/devices/counterX/countY/count 2KernelVersion: 5.2 3Contact: linux-iio@vger.kernel.org 4Description: 5 Count data of Count Y represented as a string. 6 7What: /sys/bus/counter/devices/counterX/countY/ceiling 8KernelVersion: 5.2 9Contact: linux-iio@vger.kernel.org 10Description: 11 Count value ceiling for Count Y. This is the upper limit for the 12 respective counter. 13 14What: /sys/bus/counter/devices/counterX/countY/floor 15KernelVersion: 5.2 16Contact: linux-iio@vger.kernel.org 17Description: 18 Count value floor for Count Y. This is the lower limit for the 19 respective counter. 20 21What: /sys/bus/counter/devices/counterX/countY/count_mode 22KernelVersion: 5.2 23Contact: linux-iio@vger.kernel.org 24Description: 25 Count mode for channel Y. The ceiling and floor values for 26 Count Y are used by the count mode where required. The following 27 count modes are available: 28 29 normal: 30 Counting is continuous in either direction. 31 32 range limit: 33 An upper or lower limit is set, mimicking limit switches 34 in the mechanical counterpart. The upper limit is set to 35 the Count Y ceiling value, while the lower limit is set 36 to the Count Y floor value. The counter freezes at 37 count = ceiling when counting up, and at count = floor 38 when counting down. At either of these limits, the 39 counting is resumed only when the count direction is 40 reversed. 41 42 non-recycle: 43 The counter is disabled whenever a counter overflow or 44 underflow takes place. The counter is re-enabled when a 45 new count value is loaded to the counter via a preset 46 operation or direct write. 47 48 modulo-n: 49 A count value boundary is set between the Count Y floor 50 value and the Count Y ceiling value. The counter is 51 reset to the Count Y floor value at count = ceiling when 52 counting up, while the counter is set to the Count Y 53 ceiling value at count = floor when counting down; the 54 counter does not freeze at the boundary points, but 55 counts continuously throughout. 56 57What: /sys/bus/counter/devices/counterX/countY/count_mode_available 58What: /sys/bus/counter/devices/counterX/countY/error_noise_available 59What: /sys/bus/counter/devices/counterX/countY/function_available 60What: /sys/bus/counter/devices/counterX/countY/signalZ_action_available 61KernelVersion: 5.2 62Contact: linux-iio@vger.kernel.org 63Description: 64 Discrete set of available values for the respective Count Y 65 configuration are listed in this file. Values are delimited by 66 newline characters. 67 68What: /sys/bus/counter/devices/counterX/countY/direction 69KernelVersion: 5.2 70Contact: linux-iio@vger.kernel.org 71Description: 72 Read-only attribute that indicates the count direction of Count 73 Y. Two count directions are available: forward and backward. 74 75 Some counter devices are able to determine the direction of 76 their counting. For example, quadrature encoding counters can 77 determine the direction of movement by evaluating the leading 78 phase of the respective A and B quadrature encoding signals. 79 This attribute exposes such count directions. 80 81What: /sys/bus/counter/devices/counterX/countY/enable 82KernelVersion: 5.2 83Contact: linux-iio@vger.kernel.org 84Description: 85 Whether channel Y counter is enabled. Valid attribute values are 86 boolean. 87 88 This attribute is intended to serve as a pause/unpause mechanism 89 for Count Y. Suppose a counter device is used to count the total 90 movement of a conveyor belt: this attribute allows an operator 91 to temporarily pause the counter, service the conveyor belt, 92 and then finally unpause the counter to continue where it had 93 left off. 94 95What: /sys/bus/counter/devices/counterX/countY/error_noise 96KernelVersion: 5.2 97Contact: linux-iio@vger.kernel.org 98Description: 99 Read-only attribute that indicates whether excessive noise is 100 present at the channel Y counter inputs. 101 102What: /sys/bus/counter/devices/counterX/countY/function 103KernelVersion: 5.2 104Contact: linux-iio@vger.kernel.org 105Description: 106 Count function mode of Count Y; count function evaluation is 107 triggered by conditions specified by the Count Y signalZ_action 108 attributes. The following count functions are available: 109 110 increase: 111 Accumulated count is incremented. 112 113 decrease: 114 Accumulated count is decremented. 115 116 pulse-direction: 117 Rising edges on signal A updates the respective count. 118 The input level of signal B determines direction. 119 120 quadrature x1 a: 121 If direction is forward, rising edges on quadrature pair 122 signal A updates the respective count; if the direction 123 is backward, falling edges on quadrature pair signal A 124 updates the respective count. Quadrature encoding 125 determines the direction. 126 127 quadrature x1 b: 128 If direction is forward, rising edges on quadrature pair 129 signal B updates the respective count; if the direction 130 is backward, falling edges on quadrature pair signal B 131 updates the respective count. Quadrature encoding 132 determines the direction. 133 134 quadrature x2 a: 135 Any state transition on quadrature pair signal A updates 136 the respective count. Quadrature encoding determines the 137 direction. 138 139 quadrature x2 b: 140 Any state transition on quadrature pair signal B updates 141 the respective count. Quadrature encoding determines the 142 direction. 143 144 quadrature x4: 145 Any state transition on either quadrature pair signals 146 updates the respective count. Quadrature encoding 147 determines the direction. 148 149What: /sys/bus/counter/devices/counterX/countY/name 150KernelVersion: 5.2 151Contact: linux-iio@vger.kernel.org 152Description: 153 Read-only attribute that indicates the device-specific name of 154 Count Y. If possible, this should match the name of the 155 respective channel as it appears in the device datasheet. 156 157What: /sys/bus/counter/devices/counterX/countY/preset 158KernelVersion: 5.2 159Contact: linux-iio@vger.kernel.org 160Description: 161 If the counter device supports preset registers -- registers 162 used to load counter channels to a set count upon device-defined 163 preset operation trigger events -- the preset count for channel 164 Y is provided by this attribute. 165 166What: /sys/bus/counter/devices/counterX/countY/preset_enable 167KernelVersion: 5.2 168Contact: linux-iio@vger.kernel.org 169Description: 170 Whether channel Y counter preset operation is enabled. Valid 171 attribute values are boolean. 172 173What: /sys/bus/counter/devices/counterX/countY/signalZ_action 174KernelVersion: 5.2 175Contact: linux-iio@vger.kernel.org 176Description: 177 Action mode of Count Y for Signal Z. This attribute indicates 178 the condition of Signal Z that triggers the count function 179 evaluation for Count Y. The following action modes are 180 available: 181 182 none: 183 Signal does not trigger the count function. In 184 Pulse-Direction count function mode, this Signal is 185 evaluated as Direction. 186 187 rising edge: 188 Low state transitions to high state. 189 190 falling edge: 191 High state transitions to low state. 192 193 both edges: 194 Any state transition. 195 196What: /sys/bus/counter/devices/counterX/name 197KernelVersion: 5.2 198Contact: linux-iio@vger.kernel.org 199Description: 200 Read-only attribute that indicates the device-specific name of 201 the Counter. This should match the name of the device as it 202 appears in its respective datasheet. 203 204What: /sys/bus/counter/devices/counterX/num_counts 205KernelVersion: 5.2 206Contact: linux-iio@vger.kernel.org 207Description: 208 Read-only attribute that indicates the total number of Counts 209 belonging to the Counter. 210 211What: /sys/bus/counter/devices/counterX/num_signals 212KernelVersion: 5.2 213Contact: linux-iio@vger.kernel.org 214Description: 215 Read-only attribute that indicates the total number of Signals 216 belonging to the Counter. 217 218What: /sys/bus/counter/devices/counterX/signalY/signal 219KernelVersion: 5.2 220Contact: linux-iio@vger.kernel.org 221Description: 222 Signal data of Signal Y represented as a string. 223 224What: /sys/bus/counter/devices/counterX/signalY/name 225KernelVersion: 5.2 226Contact: linux-iio@vger.kernel.org 227Description: 228 Read-only attribute that indicates the device-specific name of 229 Signal Y. If possible, this should match the name of the 230 respective signal as it appears in the device datasheet. 231