1 What: /sys/bus/counter/devices/counterX/cascade_counts_enable 2 KernelVersion: 6.4 3 Contact: linux-iio@vger.kernel.org 4 Description: 5 Indicates the cascading of Counts on Counter X. 6 7 Valid attribute values are boolean. 8 9 What: /sys/bus/counter/devices/counterX/external_input_phase_clock_select 10 KernelVersion: 6.4 11 Contact: linux-iio@vger.kernel.org 12 Description: 13 Selects the external clock pin for phase counting mode of 14 Counter X. 15 16 MTCLKA-MTCLKB: 17 MTCLKA and MTCLKB pins are selected for the external 18 phase clock. 19 20 MTCLKC-MTCLKD: 21 MTCLKC and MTCLKD pins are selected for the external 22 phase clock. 23 24 What: /sys/bus/counter/devices/counterX/external_input_phase_clock_select_available 25 KernelVersion: 6.4 26 Contact: linux-iio@vger.kernel.org 27 Description: 28 Discrete set of available values for the respective device 29 configuration are listed in this file. 30 31 What: /sys/bus/counter/devices/counterX/countY/count 32 KernelVersion: 5.2 33 Contact: linux-iio@vger.kernel.org 34 Description: 35 Count data of Count Y represented as a string. 36 37 What: /sys/bus/counter/devices/counterX/countY/capture 38 KernelVersion: 6.1 39 Contact: linux-iio@vger.kernel.org 40 Description: 41 Historical capture of the Count Y count data. 42 43 What: /sys/bus/counter/devices/counterX/countY/ceiling 44 KernelVersion: 5.2 45 Contact: linux-iio@vger.kernel.org 46 Description: 47 Count value ceiling for Count Y. This is the upper limit for the 48 respective counter. 49 50 What: /sys/bus/counter/devices/counterX/countY/floor 51 KernelVersion: 5.2 52 Contact: linux-iio@vger.kernel.org 53 Description: 54 Count value floor for Count Y. This is the lower limit for the 55 respective counter. 56 57 What: /sys/bus/counter/devices/counterX/countY/count_mode 58 KernelVersion: 5.2 59 Contact: linux-iio@vger.kernel.org 60 Description: 61 Count mode for channel Y. The ceiling and floor values for 62 Count Y are used by the count mode where required. The following 63 count modes are available: 64 65 normal: 66 Counting is continuous in either direction. 67 68 range limit: 69 An upper or lower limit is set, mimicking limit switches 70 in the mechanical counterpart. The upper limit is set to 71 the Count Y ceiling value, while the lower limit is set 72 to the Count Y floor value. The counter freezes at 73 count = ceiling when counting up, and at count = floor 74 when counting down. At either of these limits, the 75 counting is resumed only when the count direction is 76 reversed. 77 78 non-recycle: 79 The counter is disabled whenever a counter overflow or 80 underflow takes place. The counter is re-enabled when a 81 new count value is loaded to the counter via a preset 82 operation or direct write. 83 84 modulo-n: 85 A count value boundary is set between the Count Y floor 86 value and the Count Y ceiling value. The counter is 87 reset to the Count Y floor value at count = ceiling when 88 counting up, while the counter is set to the Count Y 89 ceiling value at count = floor when counting down; the 90 counter does not freeze at the boundary points, but 91 counts continuously throughout. 92 93 interrupt on terminal count: 94 The output signal is initially low, and will remain low 95 until the counter reaches zero. The output signal then 96 goes high and remains high until a new preset value is 97 set. 98 99 hardware retriggerable one-shot: 100 The output signal is initially high. The output signal 101 will go low by a trigger input signal, and will remain 102 low until the counter reaches zero. The output will then 103 go high and remain high until the next trigger. A 104 trigger results in loading the counter to the preset 105 value and setting the output signal low, thus starting 106 the one-shot pulse. 107 108 rate generator: 109 The output signal is initially high. When the counter 110 has decremented to 1, the output signal goes low for one 111 clock pulse. The output signal then goes high again, the 112 counter is reloaded to the preset value, and the process 113 repeats in a periodic manner as such. 114 115 square wave mode: 116 The output signal is initially high. 117 118 If the initial count is even, the counter is decremented 119 by two on succeeding clock pulses. When the count 120 expires, the output signal changes value and the 121 counter is reloaded to the preset value. The process 122 repeats in periodic manner as such. 123 124 If the initial count is odd, the initial count minus one 125 (an even number) is loaded and then is decremented by 126 two on succeeding clock pulses. One clock pulse after 127 the count expires, the output signal goes low and the 128 counter is reloaded to the preset value minus one. 129 Succeeding clock pulses decrement the count by two. When 130 the count expires, the output goes high again and the 131 counter is reloaded to the preset value minus one. The 132 process repeats in a periodic manner as such. 133 134 software triggered strobe: 135 The output signal is initially high. When the count 136 expires, the output will go low for one clock pulse and 137 then go high again. The counting sequence is "triggered" 138 by setting the preset value. 139 140 hardware triggered strobe: 141 The output signal is initially high. Counting is started 142 by a trigger input signal. When the count expires, the 143 output signal will go low for one clock pulse and then 144 go high again. A trigger results in loading the counter 145 to the preset value. 146 147 What: /sys/bus/counter/devices/counterX/countY/count_mode_available 148 What: /sys/bus/counter/devices/counterX/countY/error_noise_available 149 What: /sys/bus/counter/devices/counterX/countY/function_available 150 What: /sys/bus/counter/devices/counterX/countY/prescaler_available 151 What: /sys/bus/counter/devices/counterX/countY/signalZ_action_available 152 KernelVersion: 5.2 153 Contact: linux-iio@vger.kernel.org 154 Description: 155 Discrete set of available values for the respective Count Y 156 configuration are listed in this file. Values are delimited by 157 newline characters. 158 159 What: /sys/bus/counter/devices/counterX/countY/direction 160 KernelVersion: 5.2 161 Contact: linux-iio@vger.kernel.org 162 Description: 163 Read-only attribute that indicates the count direction of Count 164 Y. Two count directions are available: forward and backward. 165 166 Some counter devices are able to determine the direction of 167 their counting. For example, quadrature encoding counters can 168 determine the direction of movement by evaluating the leading 169 phase of the respective A and B quadrature encoding signals. 170 This attribute exposes such count directions. 171 172 What: /sys/bus/counter/devices/counterX/countY/enable 173 KernelVersion: 5.2 174 Contact: linux-iio@vger.kernel.org 175 Description: 176 Whether channel Y counter is enabled. Valid attribute values are 177 boolean. 178 179 This attribute is intended to serve as a pause/unpause mechanism 180 for Count Y. Suppose a counter device is used to count the total 181 movement of a conveyor belt: this attribute allows an operator 182 to temporarily pause the counter, service the conveyor belt, 183 and then finally unpause the counter to continue where it had 184 left off. 185 186 What: /sys/bus/counter/devices/counterX/countY/error_noise 187 KernelVersion: 5.2 188 Contact: linux-iio@vger.kernel.org 189 Description: 190 Read-only attribute that indicates whether excessive noise is 191 present at the channel Y counter inputs. 192 193 What: /sys/bus/counter/devices/counterX/countY/function 194 KernelVersion: 5.2 195 Contact: linux-iio@vger.kernel.org 196 Description: 197 Count function mode of Count Y; count function evaluation is 198 triggered by conditions specified by the Count Y signalZ_action 199 attributes. The following count functions are available: 200 201 increase: 202 Accumulated count is incremented. 203 204 decrease: 205 Accumulated count is decremented. 206 207 pulse-direction: 208 Rising edges on signal A updates the respective count. 209 The input level of signal B determines direction. 210 211 quadrature x1 a: 212 If direction is forward, rising edges on quadrature pair 213 signal A updates the respective count; if the direction 214 is backward, falling edges on quadrature pair signal A 215 updates the respective count. Quadrature encoding 216 determines the direction. 217 218 quadrature x1 b: 219 If direction is forward, rising edges on quadrature pair 220 signal B updates the respective count; if the direction 221 is backward, falling edges on quadrature pair signal B 222 updates the respective count. Quadrature encoding 223 determines the direction. 224 225 quadrature x2 a: 226 Any state transition on quadrature pair signal A updates 227 the respective count. Quadrature encoding determines the 228 direction. 229 230 quadrature x2 b: 231 Any state transition on quadrature pair signal B updates 232 the respective count. Quadrature encoding determines the 233 direction. 234 235 quadrature x4: 236 Any state transition on either quadrature pair signals 237 updates the respective count. Quadrature encoding 238 determines the direction. 239 240 What: /sys/bus/counter/devices/counterX/countY/name 241 KernelVersion: 5.2 242 Contact: linux-iio@vger.kernel.org 243 Description: 244 Read-only attribute that indicates the device-specific name of 245 Count Y. If possible, this should match the name of the 246 respective channel as it appears in the device datasheet. 247 248 What: /sys/bus/counter/devices/counterX/countY/prescaler 249 KernelVersion: 5.2 250 Contact: linux-iio@vger.kernel.org 251 Description: 252 Configure the prescaler value associated with Count Y. 253 On the FlexTimer, the counter clock source passes through a 254 prescaler (i.e. a counter). This acts like a clock 255 divider. 256 257 What: /sys/bus/counter/devices/counterX/countY/preset 258 KernelVersion: 5.2 259 Contact: linux-iio@vger.kernel.org 260 Description: 261 If the counter device supports preset registers -- registers 262 used to load counter channels to a set count upon device-defined 263 preset operation trigger events -- the preset count for channel 264 Y is provided by this attribute. 265 266 What: /sys/bus/counter/devices/counterX/countY/preset_enable 267 KernelVersion: 5.2 268 Contact: linux-iio@vger.kernel.org 269 Description: 270 Whether channel Y counter preset operation is enabled. Valid 271 attribute values are boolean. 272 273 What: /sys/bus/counter/devices/counterX/countY/signalZ_action 274 KernelVersion: 5.2 275 Contact: linux-iio@vger.kernel.org 276 Description: 277 Action mode of Count Y for Signal Z. This attribute indicates 278 the condition of Signal Z that triggers the count function 279 evaluation for Count Y. The following action modes are 280 available: 281 282 none: 283 Signal does not trigger the count function. In 284 Pulse-Direction count function mode, this Signal is 285 evaluated as Direction. 286 287 rising edge: 288 Low state transitions to high state. 289 290 falling edge: 291 High state transitions to low state. 292 293 both edges: 294 Any state transition. 295 296 What: /sys/bus/counter/devices/counterX/countY/num_overflows 297 KernelVersion: 6.1 298 Contact: linux-iio@vger.kernel.org 299 Description: 300 This attribute indicates the number of overflows of count Y. 301 302 What: /sys/bus/counter/devices/counterX/cascade_counts_enable_component_id 303 What: /sys/bus/counter/devices/counterX/external_input_phase_clock_select_component_id 304 What: /sys/bus/counter/devices/counterX/countY/capture_component_id 305 What: /sys/bus/counter/devices/counterX/countY/ceiling_component_id 306 What: /sys/bus/counter/devices/counterX/countY/floor_component_id 307 What: /sys/bus/counter/devices/counterX/countY/count_mode_component_id 308 What: /sys/bus/counter/devices/counterX/countY/direction_component_id 309 What: /sys/bus/counter/devices/counterX/countY/enable_component_id 310 What: /sys/bus/counter/devices/counterX/countY/error_noise_component_id 311 What: /sys/bus/counter/devices/counterX/countY/prescaler_component_id 312 What: /sys/bus/counter/devices/counterX/countY/preset_component_id 313 What: /sys/bus/counter/devices/counterX/countY/preset_enable_component_id 314 What: /sys/bus/counter/devices/counterX/countY/signalZ_action_component_id 315 What: /sys/bus/counter/devices/counterX/countY/num_overflows_component_id 316 What: /sys/bus/counter/devices/counterX/signalY/cable_fault_component_id 317 What: /sys/bus/counter/devices/counterX/signalY/cable_fault_enable_component_id 318 What: /sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler_component_id 319 What: /sys/bus/counter/devices/counterX/signalY/index_polarity_component_id 320 What: /sys/bus/counter/devices/counterX/signalY/polarity_component_id 321 What: /sys/bus/counter/devices/counterX/signalY/synchronous_mode_component_id 322 What: /sys/bus/counter/devices/counterX/signalY/frequency_component_id 323 KernelVersion: 5.16 324 Contact: linux-iio@vger.kernel.org 325 Description: 326 Read-only attribute that indicates the component ID of the 327 respective extension or Synapse. 328 329 What: /sys/bus/counter/devices/counterX/countY/spike_filter_ns 330 KernelVersion: 5.14 331 Contact: linux-iio@vger.kernel.org 332 Description: 333 If the counter device supports programmable spike filter this 334 attribute indicates the value in nanoseconds where noise pulses 335 shorter or equal to configured value are ignored. Value 0 means 336 filter is disabled. 337 338 What: /sys/bus/counter/devices/counterX/events_queue_size 339 KernelVersion: 5.16 340 Contact: linux-iio@vger.kernel.org 341 Description: 342 Size of the Counter events queue in number of struct 343 counter_event data structures. The number of elements will be 344 rounded-up to a power of 2. 345 346 What: /sys/bus/counter/devices/counterX/name 347 KernelVersion: 5.2 348 Contact: linux-iio@vger.kernel.org 349 Description: 350 Read-only attribute that indicates the device-specific name of 351 the Counter. This should match the name of the device as it 352 appears in its respective datasheet. 353 354 What: /sys/bus/counter/devices/counterX/num_counts 355 KernelVersion: 5.2 356 Contact: linux-iio@vger.kernel.org 357 Description: 358 Read-only attribute that indicates the total number of Counts 359 belonging to the Counter. 360 361 What: /sys/bus/counter/devices/counterX/num_signals 362 KernelVersion: 5.2 363 Contact: linux-iio@vger.kernel.org 364 Description: 365 Read-only attribute that indicates the total number of Signals 366 belonging to the Counter. 367 368 What: /sys/bus/counter/devices/counterX/signalY/cable_fault 369 KernelVersion: 5.7 370 Contact: linux-iio@vger.kernel.org 371 Description: 372 Read-only attribute that indicates whether a differential 373 encoder cable fault (not connected or loose wires) is detected 374 for the respective channel of Signal Y. Valid attribute values 375 are boolean. Detection must first be enabled via the 376 corresponding cable_fault_enable attribute. 377 378 What: /sys/bus/counter/devices/counterX/signalY/cable_fault_enable 379 KernelVersion: 5.7 380 Contact: linux-iio@vger.kernel.org 381 Description: 382 Whether detection of differential encoder cable faults for the 383 respective channel of Signal Y is enabled. Valid attribute 384 values are boolean. 385 386 What: /sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler 387 KernelVersion: 5.7 388 Contact: linux-iio@vger.kernel.org 389 Description: 390 Filter clock factor for input Signal Y. This prescaler value 391 affects the inputs of both quadrature pair signals. 392 393 What: /sys/bus/counter/devices/counterX/signalY/index_polarity 394 KernelVersion: 5.2 395 Contact: linux-iio@vger.kernel.org 396 Description: 397 Active level of index input Signal Y; irrelevant in 398 non-synchronous load mode. 399 400 What: /sys/bus/counter/devices/counterX/signalY/index_polarity_available 401 What: /sys/bus/counter/devices/counterX/signalY/synchronous_mode_available 402 KernelVersion: 5.2 403 Contact: linux-iio@vger.kernel.org 404 Description: 405 Discrete set of available values for the respective Signal Y 406 configuration are listed in this file. 407 408 What: /sys/bus/counter/devices/counterX/signalY/polarity 409 KernelVersion: 6.1 410 Contact: linux-iio@vger.kernel.org 411 Description: 412 Active level of Signal Y. The following polarity values are 413 available: 414 415 positive: 416 Signal high state considered active level (rising edge). 417 418 negative: 419 Signal low state considered active level (falling edge). 420 421 What: /sys/bus/counter/devices/counterX/signalY/name 422 KernelVersion: 5.2 423 Contact: linux-iio@vger.kernel.org 424 Description: 425 Read-only attribute that indicates the device-specific name of 426 Signal Y. If possible, this should match the name of the 427 respective signal as it appears in the device datasheet. 428 429 What: /sys/bus/counter/devices/counterX/signalY/signal 430 KernelVersion: 5.2 431 Contact: linux-iio@vger.kernel.org 432 Description: 433 Signal level state of Signal Y. The following signal level 434 states are available: 435 436 low: 437 Low level state. 438 439 high: 440 High level state. 441 442 What: /sys/bus/counter/devices/counterX/signalY/synchronous_mode 443 KernelVersion: 5.2 444 Contact: linux-iio@vger.kernel.org 445 Description: 446 Configure the counter associated with Signal Y for 447 non-synchronous or synchronous load mode. Synchronous load mode 448 cannot be selected in non-quadrature (Pulse-Direction) clock 449 mode. 450 451 non-synchronous: 452 A logic low level is the active level at this index 453 input. The index function (as enabled via preset_enable) 454 is performed directly on the active level of the index 455 input. 456 457 synchronous: 458 Intended for interfacing with encoder Index output in 459 quadrature clock mode. The active level is configured 460 via index_polarity. The index function (as enabled via 461 preset_enable) is performed synchronously with the 462 quadrature clock on the active level of the index input. 463 464 What: /sys/bus/counter/devices/counterX/signalY/frequency 465 KernelVersion: 6.1 466 Contact: linux-iio@vger.kernel.org 467 Description: 468 Read-only attribute that indicates the signal Y frequency, in Hz.
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