1 /* 2 * Copyright (c) 2021 Leonard Pollak 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #ifndef ZEPHYR_DRIVERS_SENSOR_SGP40_SGP40_H_ 8 #define ZEPHYR_DRIVERS_SENSOR_SGP40_SGP40_H_ 9 10 #include <zephyr/device.h> 11 12 #define SGP40_CMD_MEASURE_RAW 0x260F 13 #define SGP40_CMD_MEASURE_TEST 0x280E 14 #define SGP40_CMD_HEATER_OFF 0x3615 15 16 #define SGP40_TEST_OK 0xD400 17 #define SGP40_TEST_FAIL 0x4B00 18 19 #define SGP40_RESET_WAIT_MS 10 20 #define SGP40_MEASURE_WAIT_MS 30 21 #define SGP40_TEST_WAIT_MS 250 22 23 /* 24 * CRC parameters were taken from the 25 * "Checksum Calculation" section of the datasheet. 26 */ 27 #define SGP40_CRC_POLY 0x31 28 #define SGP40_CRC_INIT 0xFF 29 30 /* 31 * Value range of compensation data parameters 32 */ 33 #define SGP40_COMP_MIN_RH 0 34 #define SGP40_COMP_MAX_RH 100 35 #define SGP40_COMP_MIN_T -45 36 #define SGP40_COMP_MAX_T 130 37 #define SGP40_COMP_DEFAULT_T 25 38 #define SGP40_COMP_DEFAULT_RH 50 39 40 struct sgp40_config { 41 struct i2c_dt_spec bus; 42 bool selftest; 43 }; 44 45 struct sgp40_data { 46 uint16_t raw_sample; 47 int8_t rh_param[3]; 48 int8_t t_param[3]; 49 }; 50 51 #endif /* ZEPHYR_DRIVERS_SENSOR_SGP40_SGP40_H_ */ 52
