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      1 /*	$NetBSD: sgp40reg.h,v 1.1 2021/10/14 13:54:46 brad Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2021 Brad Spencer <brad (at) anduin.eldar.org>
      5  *
      6  * Permission to use, copy, modify, and distribute this software for any
      7  * purpose with or without fee is hereby granted, provided that the above
      8  * copyright notice and this permission notice appear in all copies.
      9  *
     10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     17  */
     18 
     19 #ifndef _DEV_I2C_SGP40REG_H_
     20 #define _DEV_I2C_SGP40REG_H_
     21 
     22 #define SGP40_TYPICAL_ADDR	0x59
     23 
     24 /* There are three documented commands for this chip, plus one that is called a
     25    soft reset.  But really the soft reset is a general reset of all devices on
     26    the bus, hence it is not as usable as one would hope
     27  */
     28 
     29 #define SGP40_MEASURE_RAW 0x260f
     30 #define SGP40_MEASURE_TEST 0x280e
     31 #define SGP40_HEATER_OFF 0x3615
     32 /* The get serial number command is documented in version 1.1 of the
     33    datasheet.
     34 */
     35 #define SGP40_GET_SERIAL_NUMBER 0x3682
     36 /* The get featureset command is not documented in any datasheet that could
     37    be found.  However, it is present and used in a lot of example code.
     38    It has no additional arguments aside from the command itself, and returns
     39    a uint16_t for the data and a uint8_t for the crc.
     40 */
     41 #define SGP40_GET_FEATURESET 0x202f
     42 
     43 /* The results of a self test are documented as being either everything is ok, or
     44    something failed.
     45  */
     46 
     47 #define SGP40_TEST_RESULTS_ALL_PASSED 0xd400
     48 #define SGP40_TEST_RESULTS_SOME_FAILED 0x4b00
     49 
     50 #endif
     51