79 lines
2.2 KiB
Python
79 lines
2.2 KiB
Python
# The MIT License (MIT)
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#
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# Copyright (c) 2018 Carter Nelson for Adafruit Industries
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""
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`ads1015`
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====================================================
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CircuitPython driver for ADS1015 ADCs.
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* Author(s): Carter Nelson
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"""
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import struct
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# pylint: disable=unused-import
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from .ads1x15 import ADS1x15, Mode
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# Data sample rates
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_ADS1015_CONFIG_DR = {
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128: 0x0000,
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250: 0x0020,
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490: 0x0040,
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920: 0x0060,
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1600: 0x0080,
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2400: 0x00A0,
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3300: 0x00C0,
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}
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# Pins
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P0 = 0
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P1 = 1
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P2 = 2
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P3 = 3
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class ADS1015(ADS1x15):
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"""Class for the ADS1015 12 bit ADC."""
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@property
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def bits(self):
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"""The ADC bit resolution."""
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return 12
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@property
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def rates(self):
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"""Possible data rate settings."""
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r = list(_ADS1015_CONFIG_DR.keys())
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r.sort()
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return r
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@property
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def rate_config(self):
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"""Rate configuration masks."""
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return _ADS1015_CONFIG_DR
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def _data_rate_default(self):
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return 1600
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def _conversion_value(self, raw_adc):
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raw_adc = raw_adc.to_bytes(2, "big")
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value = struct.unpack(">h", raw_adc)[0]
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return value >> 4
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