69 lines
2.0 KiB
YAML
69 lines
2.0 KiB
YAML
# Copyright (c) 2023, TOKITA Hiroshi
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# SPDX-License-Identifier: Apache-2.0
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description: |
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The pio node configured for ws2812.
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compatible: "worldsemi,ws2812-rpi_pico-pio"
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include: pinctrl-device.yaml
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properties:
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bit-waveform:
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type: array
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description: |
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This property defines the waveform for sending 1-bit data.
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The program uses the first three elements of the array.
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The T0 is equal to T0H in the datasheet.
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The T2 is equal to T1L in the datasheet.
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The T1 is equal to (T1H-T0H) or (T0L-T1L) in the datasheet.
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Code-0
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+------+ +---
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| T0 | T1+T2 |
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---+ +-----------------+
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Code-1
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+---------------+ +---
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| T0+T1 | T2 |
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---+ +--------+
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The frequency determines the wave period.
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The T0～T2 means ratio in one period.
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For example, T0=3, T1=3, T2=4 and the frequency is 800kHz case,
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T0H is
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(1 / 800kHz) * (3/10) = 375ns
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T0L is
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(1 / 800kHz) * ((4+3)/10) = 875ns
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child-binding:
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description: |
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Worldsemi WS2812 or compatible LED strip driver based on RaspberryPi Pico's PIO
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The LED strip node can put up to 4 instances under a single PIO node.
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include: ws2812.yaml
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properties:
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output-pin:
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type: int
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required: true
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description: |
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Select the output pin.
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Note: This driver does not configure the output pin.
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You need to configure the pin with pinctrl that is in the parent node configuration
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for use by PIO.
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frequency:
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type: int
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description: |
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Specify the number of times a waveform representing 1 bit is
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transmitted per second. It is same meaning as bit-per-seconds.
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WS2812 works with 800000. Set the value 400000 if use with WS2811.
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