51 lines
1.9 KiB
C
51 lines
1.9 KiB
C
/* $NetBSD: sgp40reg.h,v 1.1 2021/10/14 13:54:46 brad Exp $ */
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/*
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* Copyright (c) 2021 Brad Spencer <brad@anduin.eldar.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef _DEV_I2C_SGP40REG_H_
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#define _DEV_I2C_SGP40REG_H_
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#define SGP40_TYPICAL_ADDR 0x59
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/* There are three documented commands for this chip, plus one that is called a
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soft reset. But really the soft reset is a general reset of all devices on
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the bus, hence it is not as usable as one would hope
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*/
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#define SGP40_MEASURE_RAW 0x260f
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#define SGP40_MEASURE_TEST 0x280e
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#define SGP40_HEATER_OFF 0x3615
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/* The get serial number command is documented in version 1.1 of the
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datasheet.
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*/
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#define SGP40_GET_SERIAL_NUMBER 0x3682
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/* The get featureset command is not documented in any datasheet that could
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be found. However, it is present and used in a lot of example code.
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It has no additional arguments aside from the command itself, and returns
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a uint16_t for the data and a uint8_t for the crc.
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*/
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#define SGP40_GET_FEATURESET 0x202f
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/* The results of a self test are documented as being either everything is ok, or
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something failed.
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*/
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#define SGP40_TEST_RESULTS_ALL_PASSED 0xd400
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#define SGP40_TEST_RESULTS_SOME_FAILED 0x4b00
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#endif
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