52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
/*
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* Copyright (c) 2021 Leonard Pollak
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_DRIVERS_SENSOR_SGP40_SGP40_H_
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#define ZEPHYR_DRIVERS_SENSOR_SGP40_SGP40_H_
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#include <device.h>
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#define SGP40_CMD_MEASURE_RAW 0x260F
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#define SGP40_CMD_MEASURE_TEST 0x280E
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#define SGP40_CMD_HEATER_OFF 0x3615
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#define SGP40_TEST_OK 0xD400
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#define SGP40_TEST_FAIL 0x4B00
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#define SGP40_RESET_WAIT_MS 10
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#define SGP40_MEASURE_WAIT_MS 30
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#define SGP40_TEST_WAIT_MS 250
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/*
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* CRC parameters were taken from the
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* "Checksum Calculation" section of the datasheet.
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*/
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#define SGP40_CRC_POLY 0x31
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#define SGP40_CRC_INIT 0xFF
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/*
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* Value range of compensation data parameters
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*/
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#define SGP40_COMP_MIN_RH 0
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#define SGP40_COMP_MAX_RH 100
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#define SGP40_COMP_MIN_T -45
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#define SGP40_COMP_MAX_T 130
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#define SGP40_COMP_DEFAULT_T 25
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#define SGP40_COMP_DEFAULT_RH 50
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struct sgp40_config {
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struct i2c_dt_spec bus;
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bool selftest;
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};
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struct sgp40_data {
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uint16_t raw_sample;
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int8_t rh_param[3];
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int8_t t_param[3];
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};
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#endif /* ZEPHYR_DRIVERS_SENSOR_SGP40_SGP40_H_ */
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