st,stm32-qdec
Vendor: STMicroelectronics
Note
An implementation of a driver matching this compatible is available in drivers/sensor/st/qdec_stm32/qdec_stm32.c.
Description
STM32 quadrature decoder
Properties
Properties not inherited from the base binding file.
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Type |
Details |
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Pin configuration/s for the first state. Content is specific to the
selected pin controller driver implementation.
This property is required. |
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Names for the provided states. The number of names needs to match the
number of states.
This property is required. |
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Set encoder mode.
The following modes are supported:
0x1: Encoder mode 1 (Default)
0x2: Encoder mode 2
0x3: Encoder mode 3
Some MCUs supports additional modes:
0x10002: Encoder mode: Clock plus direction, x2 mode
0x10003: Encoder mode: Clock plus direction, x1 mode
0x10004: Encoder mode: Directional Clock, x2 mode
0x10005: Encoder mode: Directional Clock, x1 mode
0x10006: Quadrature encoder mode: x1 mode, counting on tim_ti1fp1
0x10007: Quadrature encoder mode: x1 mode, counting on tim_ti2fp2
Default value complies with stm32 low level timer encoder init value.
Default value: Legal values: |
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Encoder is triggered by a falling edge on the input pin
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Intensity of the filter applied to the input signal. This is
implemented by scaling the sampling frequency and adding a counter
in which N consecutive samples with same value are needed to validate
a transition.
Mapping is as follows (F_clk is the timer's clock):
0: No filter, sampling is done at F_dts (default value)
1: Fs = F_clk, N=2
2: Fs = F_clk, N=4
3: Fs = F_clk, N=8
4: Fs = F_clk/2, N=6
5: Fs = F_clk/2, N=8
6: Fs = F_clk/4, N=6
7: Fs = F_clk/4, N=8
8: Fs = F_clk/8, N=6
9: Fs = F_clk/8, N=8
10: Fs = F_clk/16, N=5
11: Fs = F_clk/16, N=6
12: Fs = F_clk/16, N=8
13: Fs = F_clk/32, N=5
14: Fs = F_clk/32, N=6
15: Fs = F_clk/32, N=8
Default value is set by hardware at reset
Legal values: |
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This is a number >= 1 that is used to determine how many revolutions
were done based on the current counter's value.
This property is required. |
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Pin configuration/s for the second state. See pinctrl-0.
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Pin configuration/s for the third state. See pinctrl-0.
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Pin configuration/s for the fourth state. See pinctrl-0.
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Pin configuration/s for the fifth state. See pinctrl-0.
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Deprecated properties not inherited from the base binding file.
(None)
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “st,stm32-qdec” compatible.
Name |
Type |
Details |
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indicates the operational status of a device
Legal values: See Important properties for more information. |
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compatible strings
This property is required. See Important properties for more information. |
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register space
See Important properties for more information. |
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name of each register space
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interrupts for device
See Important properties for more information. |
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extended interrupt specifier for device
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name of each interrupt
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phandle to interrupt controller node
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Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
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Clock gate information
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name of each clock
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number of address cells in reg property
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number of size cells in reg property
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DMA channels specifiers
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Provided names of DMA channel specifiers
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IO channels specifiers
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Provided names of IO channel specifiers
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mailbox / IPM channels specifiers
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Provided names of mailbox / IPM channel specifiers
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Power domain specifiers
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Provided names of power domain specifiers
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Number of cells in power-domains property
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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
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Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
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Automatically configure the device for runtime power management after the
init function runs.
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List of power states that will disable this device power.
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