51 lines
1.2 KiB
YAML
51 lines
1.2 KiB
YAML
# Copyright (c) 2022 Wolter HV <wolterhv@gmx.de>
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#
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# SPDX-License-Identifier: Apache-2.0
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description: |
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Espressif ESP32 ADC
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Possible available resolutions depends on the used chip.
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- ESP32 < 9,10,11,12 >
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- ESP32-S2 < 12 >
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- ESP32-C3 < 12 >
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- ESP32-S3 < 12 >
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For chips with configurable resolution feature (ESP32),
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maximum resolution will be used if not set explicitly.
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Zephyr API is using gain unit to characterize ADC input.
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To achieve compatibility we choose to select those gain,
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which corresponds to the ESP32 ADC attenuation feature.
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ESP32,attenuation ~ zephyr,gain
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----------------- -----------
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0 dB ADC_GAIN_1
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2.5 dB ADC_GAIN_4_5
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6 dB ADC_GAIN_1_2
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11 dB ADC_GAIN_1_4
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In case unsupported gain is selected the adc_channel_setup()
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would return ENOTSUP error.
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compatible: "espressif,esp32-adc"
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include: [adc-controller.yaml]
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properties:
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unit:
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type: int
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required: true
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description: ADC unit number.
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Possible values are 1,2,.. depending on chip.
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channel-count:
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type: int
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required: true
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description: The maximum channels supported on each unit.
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"#io-channel-cells":
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const: 1
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io-channel-cells:
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- input
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