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1What: /sys/bus/counter/devices/counterX/cascade_counts_enable
2KernelVersion: 6.4
3Contact: linux-iio@vger.kernel.org
4Description:
5 Indicates the cascading of Counts on Counter X.
6
7 Valid attribute values are boolean.
8
9What: /sys/bus/counter/devices/counterX/external_input_phase_clock_select
10KernelVersion: 6.4
11Contact: linux-iio@vger.kernel.org
12Description:
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
24What: /sys/bus/counter/devices/counterX/external_input_phase_clock_select_available
25KernelVersion: 6.4
26Contact: linux-iio@vger.kernel.org
27Description:
28 Discrete set of available values for the respective device
29 configuration are listed in this file.
30
31What: /sys/bus/counter/devices/counterX/countY/count
32KernelVersion: 5.2
33Contact: linux-iio@vger.kernel.org
34Description:
35 Count data of Count Y represented as a string.
36
37What: /sys/bus/counter/devices/counterX/countY/compare
38KernelVersion: 6.15
39Contact: linux-iio@vger.kernel.org
40Description:
41 If the counter device supports compare registers -- registers
42 used to compare counter channels against a particular count --
43 the compare count for channel Y is provided by this attribute.
44
45What: /sys/bus/counter/devices/counterX/countY/capture
46KernelVersion: 6.1
47Contact: linux-iio@vger.kernel.org
48Description:
49 Historical capture of the Count Y count data.
50
51What: /sys/bus/counter/devices/counterX/countY/ceiling
52KernelVersion: 5.2
53Contact: linux-iio@vger.kernel.org
54Description:
55 Count value ceiling for Count Y. This is the upper limit for the
56 respective counter.
57
58What: /sys/bus/counter/devices/counterX/countY/floor
59KernelVersion: 5.2
60Contact: linux-iio@vger.kernel.org
61Description:
62 Count value floor for Count Y. This is the lower limit for the
63 respective counter.
64
65What: /sys/bus/counter/devices/counterX/countY/count_mode
66KernelVersion: 5.2
67Contact: linux-iio@vger.kernel.org
68Description:
69 Count mode for channel Y. The ceiling and floor values for
70 Count Y are used by the count mode where required. The following
71 count modes are available:
72
73 normal:
74 Counting is continuous in either direction.
75
76 range limit:
77 An upper or lower limit is set, mimicking limit switches
78 in the mechanical counterpart. The upper limit is set to
79 the Count Y ceiling value, while the lower limit is set
80 to the Count Y floor value. The counter freezes at
81 count = ceiling when counting up, and at count = floor
82 when counting down. At either of these limits, the
83 counting is resumed only when the count direction is
84 reversed.
85
86 non-recycle:
87 The counter is disabled whenever a counter overflow or
88 underflow takes place. The counter is re-enabled when a
89 new count value is loaded to the counter via a preset
90 operation or direct write.
91
92 modulo-n:
93 A count value boundary is set between the Count Y floor
94 value and the Count Y ceiling value. The counter is
95 reset to the Count Y floor value at count = ceiling when
96 counting up, while the counter is set to the Count Y
97 ceiling value at count = floor when counting down; the
98 counter does not freeze at the boundary points, but
99 counts continuously throughout.
100
101 interrupt on terminal count:
102 The output signal is initially low, and will remain low
103 until the counter reaches zero. The output signal then
104 goes high and remains high until a new preset value is
105 set.
106
107 hardware retriggerable one-shot:
108 The output signal is initially high. The output signal
109 will go low by a trigger input signal, and will remain
110 low until the counter reaches zero. The output will then
111 go high and remain high until the next trigger. A
112 trigger results in loading the counter to the preset
113 value and setting the output signal low, thus starting
114 the one-shot pulse.
115
116 rate generator:
117 The output signal is initially high. When the counter
118 has decremented to 1, the output signal goes low for one
119 clock pulse. The output signal then goes high again, the
120 counter is reloaded to the preset value, and the process
121 repeats in a periodic manner as such.
122
123 square wave mode:
124 The output signal is initially high.
125
126 If the initial count is even, the counter is decremented
127 by two on succeeding clock pulses. When the count
128 expires, the output signal changes value and the
129 counter is reloaded to the preset value. The process
130 repeats in periodic manner as such.
131
132 If the initial count is odd, the initial count minus one
133 (an even number) is loaded and then is decremented by
134 two on succeeding clock pulses. One clock pulse after
135 the count expires, the output signal goes low and the
136 counter is reloaded to the preset value minus one.
137 Succeeding clock pulses decrement the count by two. When
138 the count expires, the output goes high again and the
139 counter is reloaded to the preset value minus one. The
140 process repeats in a periodic manner as such.
141
142 software triggered strobe:
143 The output signal is initially high. When the count
144 expires, the output will go low for one clock pulse and
145 then go high again. The counting sequence is "triggered"
146 by setting the preset value.
147
148 hardware triggered strobe:
149 The output signal is initially high. Counting is started
150 by a trigger input signal. When the count expires, the
151 output signal will go low for one clock pulse and then
152 go high again. A trigger results in loading the counter
153 to the preset value.
154
155What: /sys/bus/counter/devices/counterX/countY/count_mode_available
156What: /sys/bus/counter/devices/counterX/countY/error_noise_available
157What: /sys/bus/counter/devices/counterX/countY/function_available
158What: /sys/bus/counter/devices/counterX/countY/prescaler_available
159What: /sys/bus/counter/devices/counterX/countY/signalZ_action_available
160KernelVersion: 5.2
161Contact: linux-iio@vger.kernel.org
162Description:
163 Discrete set of available values for the respective Count Y
164 configuration are listed in this file. Values are delimited by
165 newline characters.
166
167What: /sys/bus/counter/devices/counterX/countY/direction
168KernelVersion: 5.2
169Contact: linux-iio@vger.kernel.org
170Description:
171 Read-only attribute that indicates the count direction of Count
172 Y. Two count directions are available: forward and backward.
173
174 Some counter devices are able to determine the direction of
175 their counting. For example, quadrature encoding counters can
176 determine the direction of movement by evaluating the leading
177 phase of the respective A and B quadrature encoding signals.
178 This attribute exposes such count directions.
179
180What: /sys/bus/counter/devices/counterX/countY/enable
181KernelVersion: 5.2
182Contact: linux-iio@vger.kernel.org
183Description:
184 Whether channel Y counter is enabled. Valid attribute values are
185 boolean.
186
187 This attribute is intended to serve as a pause/unpause mechanism
188 for Count Y. Suppose a counter device is used to count the total
189 movement of a conveyor belt: this attribute allows an operator
190 to temporarily pause the counter, service the conveyor belt,
191 and then finally unpause the counter to continue where it had
192 left off.
193
194What: /sys/bus/counter/devices/counterX/countY/error_noise
195KernelVersion: 5.2
196Contact: linux-iio@vger.kernel.org
197Description:
198 Read-only attribute that indicates whether excessive noise is
199 present at the channel Y counter inputs.
200
201What: /sys/bus/counter/devices/counterX/countY/function
202KernelVersion: 5.2
203Contact: linux-iio@vger.kernel.org
204Description:
205 Count function mode of Count Y; count function evaluation is
206 triggered by conditions specified by the Count Y signalZ_action
207 attributes. The following count functions are available:
208
209 increase:
210 Accumulated count is incremented.
211
212 decrease:
213 Accumulated count is decremented.
214
215 pulse-direction:
216 Rising edges on signal A updates the respective count.
217 The input level of signal B determines direction.
218
219 quadrature x1 a:
220 If direction is forward, rising edges on quadrature pair
221 signal A updates the respective count; if the direction
222 is backward, falling edges on quadrature pair signal A
223 updates the respective count. Quadrature encoding
224 determines the direction.
225
226 quadrature x1 b:
227 If direction is forward, rising edges on quadrature pair
228 signal B updates the respective count; if the direction
229 is backward, falling edges on quadrature pair signal B
230 updates the respective count. Quadrature encoding
231 determines the direction.
232
233 quadrature x2 a:
234 Any state transition on quadrature pair signal A updates
235 the respective count. Quadrature encoding determines the
236 direction.
237
238 quadrature x2 b:
239 Any state transition on quadrature pair signal B updates
240 the respective count. Quadrature encoding determines the
241 direction.
242
243 quadrature x4:
244 Any state transition on either quadrature pair signals
245 updates the respective count. Quadrature encoding
246 determines the direction.
247
248What: /sys/bus/counter/devices/counterX/countY/name
249KernelVersion: 5.2
250Contact: linux-iio@vger.kernel.org
251Description:
252 Read-only attribute that indicates the device-specific name of
253 Count Y. If possible, this should match the name of the
254 respective channel as it appears in the device datasheet.
255
256What: /sys/bus/counter/devices/counterX/countY/prescaler
257KernelVersion: 5.2
258Contact: linux-iio@vger.kernel.org
259Description:
260 Configure the prescaler value associated with Count Y.
261 On the FlexTimer, the counter clock source passes through a
262 prescaler (i.e. a counter). This acts like a clock
263 divider.
264
265What: /sys/bus/counter/devices/counterX/countY/preset
266KernelVersion: 5.2
267Contact: linux-iio@vger.kernel.org
268Description:
269 If the counter device supports preset registers -- registers
270 used to load counter channels to a set count upon device-defined
271 preset operation trigger events -- the preset count for channel
272 Y is provided by this attribute.
273
274What: /sys/bus/counter/devices/counterX/countY/preset_enable
275KernelVersion: 5.2
276Contact: linux-iio@vger.kernel.org
277Description:
278 Whether channel Y counter preset operation is enabled. Valid
279 attribute values are boolean.
280
281What: /sys/bus/counter/devices/counterX/countY/signalZ_action
282KernelVersion: 5.2
283Contact: linux-iio@vger.kernel.org
284Description:
285 Action mode of Count Y for Signal Z. This attribute indicates
286 the condition of Signal Z that triggers the count function
287 evaluation for Count Y. The following action modes are
288 available:
289
290 none:
291 Signal does not trigger the count function. In
292 Pulse-Direction count function mode, this Signal is
293 evaluated as Direction.
294
295 rising edge:
296 Low state transitions to high state.
297
298 falling edge:
299 High state transitions to low state.
300
301 both edges:
302 Any state transition.
303
304What: /sys/bus/counter/devices/counterX/countY/num_overflows
305KernelVersion: 6.1
306Contact: linux-iio@vger.kernel.org
307Description:
308 This attribute indicates the number of overflows of count Y.
309
310What: /sys/bus/counter/devices/counterX/cascade_counts_enable_component_id
311What: /sys/bus/counter/devices/counterX/external_input_phase_clock_select_component_id
312What: /sys/bus/counter/devices/counterX/countY/capture_component_id
313What: /sys/bus/counter/devices/counterX/countY/ceiling_component_id
314What: /sys/bus/counter/devices/counterX/countY/compare_component_id
315What: /sys/bus/counter/devices/counterX/countY/count_mode_component_id
316What: /sys/bus/counter/devices/counterX/countY/direction_component_id
317What: /sys/bus/counter/devices/counterX/countY/enable_component_id
318What: /sys/bus/counter/devices/counterX/countY/error_noise_component_id
319What: /sys/bus/counter/devices/counterX/countY/floor_component_id
320What: /sys/bus/counter/devices/counterX/countY/num_overflows_component_id
321What: /sys/bus/counter/devices/counterX/countY/prescaler_component_id
322What: /sys/bus/counter/devices/counterX/countY/preset_component_id
323What: /sys/bus/counter/devices/counterX/countY/preset_enable_component_id
324What: /sys/bus/counter/devices/counterX/countY/signalZ_action_component_id
325What: /sys/bus/counter/devices/counterX/signalY/cable_fault_component_id
326What: /sys/bus/counter/devices/counterX/signalY/cable_fault_enable_component_id
327What: /sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler_component_id
328What: /sys/bus/counter/devices/counterX/signalY/frequency_component_id
329What: /sys/bus/counter/devices/counterX/signalY/index_polarity_component_id
330What: /sys/bus/counter/devices/counterX/signalY/polarity_component_id
331What: /sys/bus/counter/devices/counterX/signalY/synchronous_mode_component_id
332KernelVersion: 5.16
333Contact: linux-iio@vger.kernel.org
334Description:
335 Read-only attribute that indicates the component ID of the
336 respective extension or Synapse.
337
338What: /sys/bus/counter/devices/counterX/countY/spike_filter_ns
339KernelVersion: 5.14
340Contact: linux-iio@vger.kernel.org
341Description:
342 If the counter device supports programmable spike filter this
343 attribute indicates the value in nanoseconds where noise pulses
344 shorter or equal to configured value are ignored. Value 0 means
345 filter is disabled.
346
347What: /sys/bus/counter/devices/counterX/events_queue_size
348KernelVersion: 5.16
349Contact: linux-iio@vger.kernel.org
350Description:
351 Size of the Counter events queue in number of struct
352 counter_event data structures. The number of elements will be
353 rounded-up to a power of 2.
354
355What: /sys/bus/counter/devices/counterX/name
356KernelVersion: 5.2
357Contact: linux-iio@vger.kernel.org
358Description:
359 Read-only attribute that indicates the device-specific name of
360 the Counter. This should match the name of the device as it
361 appears in its respective datasheet.
362
363What: /sys/bus/counter/devices/counterX/num_counts
364KernelVersion: 5.2
365Contact: linux-iio@vger.kernel.org
366Description:
367 Read-only attribute that indicates the total number of Counts
368 belonging to the Counter.
369
370What: /sys/bus/counter/devices/counterX/num_signals
371KernelVersion: 5.2
372Contact: linux-iio@vger.kernel.org
373Description:
374 Read-only attribute that indicates the total number of Signals
375 belonging to the Counter.
376
377What: /sys/bus/counter/devices/counterX/signalY/cable_fault
378KernelVersion: 5.7
379Contact: linux-iio@vger.kernel.org
380Description:
381 Read-only attribute that indicates whether a differential
382 encoder cable fault (not connected or loose wires) is detected
383 for the respective channel of Signal Y. Valid attribute values
384 are boolean. Detection must first be enabled via the
385 corresponding cable_fault_enable attribute.
386
387What: /sys/bus/counter/devices/counterX/signalY/cable_fault_enable
388KernelVersion: 5.7
389Contact: linux-iio@vger.kernel.org
390Description:
391 Whether detection of differential encoder cable faults for the
392 respective channel of Signal Y is enabled. Valid attribute
393 values are boolean.
394
395What: /sys/bus/counter/devices/counterX/signalY/filter_clock_prescaler
396KernelVersion: 5.7
397Contact: linux-iio@vger.kernel.org
398Description:
399 Filter clock factor for input Signal Y. This prescaler value
400 affects the inputs of both quadrature pair signals.
401
402What: /sys/bus/counter/devices/counterX/signalY/index_polarity
403KernelVersion: 5.2
404Contact: linux-iio@vger.kernel.org
405Description:
406 Active level of index input Signal Y; irrelevant in
407 non-synchronous load mode.
408
409What: /sys/bus/counter/devices/counterX/signalY/index_polarity_available
410What: /sys/bus/counter/devices/counterX/signalY/synchronous_mode_available
411KernelVersion: 5.2
412Contact: linux-iio@vger.kernel.org
413Description:
414 Discrete set of available values for the respective Signal Y
415 configuration are listed in this file.
416
417What: /sys/bus/counter/devices/counterX/signalY/polarity
418KernelVersion: 6.1
419Contact: linux-iio@vger.kernel.org
420Description:
421 Active level of Signal Y. The following polarity values are
422 available:
423
424 positive:
425 Signal high state considered active level (rising edge).
426
427 negative:
428 Signal low state considered active level (falling edge).
429
430What: /sys/bus/counter/devices/counterX/signalY/name
431KernelVersion: 5.2
432Contact: linux-iio@vger.kernel.org
433Description:
434 Read-only attribute that indicates the device-specific name of
435 Signal Y. If possible, this should match the name of the
436 respective signal as it appears in the device datasheet.
437
438What: /sys/bus/counter/devices/counterX/signalY/signal
439KernelVersion: 5.2
440Contact: linux-iio@vger.kernel.org
441Description:
442 Signal level state of Signal Y. The following signal level
443 states are available:
444
445 low:
446 Low level state.
447
448 high:
449 High level state.
450
451What: /sys/bus/counter/devices/counterX/signalY/synchronous_mode
452KernelVersion: 5.2
453Contact: linux-iio@vger.kernel.org
454Description:
455 Configure the counter associated with Signal Y for
456 non-synchronous or synchronous load mode. Synchronous load mode
457 cannot be selected in non-quadrature (Pulse-Direction) clock
458 mode.
459
460 non-synchronous:
461 A logic low level is the active level at this index
462 input. The index function (as enabled via preset_enable)
463 is performed directly on the active level of the index
464 input.
465
466 synchronous:
467 Intended for interfacing with encoder Index output in
468 quadrature clock mode. The active level is configured
469 via index_polarity. The index function (as enabled via
470 preset_enable) is performed synchronously with the
471 quadrature clock on the active level of the index input.
472
473What: /sys/bus/counter/devices/counterX/signalY/frequency
474KernelVersion: 6.1
475Contact: linux-iio@vger.kernel.org
476Description:
477 Read-only attribute that indicates the signal Y frequency, in Hz.