mirror of
https://github.com/cmur2/python-bme680.git
synced 2024-11-14 18:56:19 +01:00
3e4bf56802
The / operator in Python 3 returns a float, which was causing TypeErrors when being passed to the << or >> operators.
386 lines
9.8 KiB
Python
386 lines
9.8 KiB
Python
# BME680 General config
|
|
POLL_PERIOD_MS = 10
|
|
|
|
# BME680 I2C addresses
|
|
I2C_ADDR_PRIMARY = 0x76
|
|
I2C_ADDR_SECONDARY = 0x77
|
|
|
|
# BME680 unique chip identifier
|
|
CHIP_ID = 0x61
|
|
|
|
# BME680 coefficients related defines
|
|
COEFF_SIZE = 41
|
|
COEFF_ADDR1_LEN = 25
|
|
COEFF_ADDR2_LEN = 16
|
|
|
|
# BME680 field_x related defines
|
|
FIELD_LENGTH = 15
|
|
FIELD_ADDR_OFFSET = 17
|
|
|
|
# Soft reset command
|
|
SOFT_RESET_CMD = 0xb6
|
|
|
|
# Error code definitions
|
|
OK = 0
|
|
# Errors
|
|
E_NULL_PTR = -1
|
|
E_COM_FAIL = -2
|
|
E_DEV_NOT_FOUND = -3
|
|
E_INVALID_LENGTH = -4
|
|
|
|
# Warnings
|
|
W_DEFINE_PWR_MODE = 1
|
|
W_NO_NEW_DATA = 2
|
|
|
|
# Info's
|
|
I_MIN_CORRECTION = 1
|
|
I_MAX_CORRECTION = 2
|
|
|
|
# Register map
|
|
# Other coefficient's address
|
|
ADDR_RES_HEAT_VAL_ADDR = 0x00
|
|
ADDR_RES_HEAT_RANGE_ADDR = 0x02
|
|
ADDR_RANGE_SW_ERR_ADDR = 0x04
|
|
ADDR_SENS_CONF_START = 0x5A
|
|
ADDR_GAS_CONF_START = 0x64
|
|
|
|
# Field settings
|
|
FIELD0_ADDR = 0x1d
|
|
|
|
# Heater settings
|
|
RES_HEAT0_ADDR = 0x5a
|
|
GAS_WAIT0_ADDR = 0x64
|
|
|
|
# Sensor configuration registers
|
|
CONF_HEAT_CTRL_ADDR = 0x70
|
|
CONF_ODR_RUN_GAS_NBC_ADDR = 0x71
|
|
CONF_OS_H_ADDR = 0x72
|
|
MEM_PAGE_ADDR = 0xf3
|
|
CONF_T_P_MODE_ADDR = 0x74
|
|
CONF_ODR_FILT_ADDR = 0x75
|
|
|
|
# Coefficient's address
|
|
COEFF_ADDR1 = 0x89
|
|
COEFF_ADDR2 = 0xe1
|
|
|
|
# Chip identifier
|
|
CHIP_ID_ADDR = 0xd0
|
|
|
|
# Soft reset register
|
|
SOFT_RESET_ADDR = 0xe0
|
|
|
|
# Heater control settings
|
|
ENABLE_HEATER = 0x00
|
|
DISABLE_HEATER = 0x08
|
|
|
|
# Gas measurement settings
|
|
DISABLE_GAS_MEAS = 0x00
|
|
ENABLE_GAS_MEAS = 0x01
|
|
|
|
# Over-sampling settings
|
|
OS_NONE = 0
|
|
OS_1X = 1
|
|
OS_2X = 2
|
|
OS_4X = 3
|
|
OS_8X = 4
|
|
OS_16X = 5
|
|
|
|
# IIR filter settings
|
|
FILTER_SIZE_0 = 0
|
|
FILTER_SIZE_1 = 1
|
|
FILTER_SIZE_3 = 2
|
|
FILTER_SIZE_7 = 3
|
|
FILTER_SIZE_15 = 4
|
|
FILTER_SIZE_31 = 5
|
|
FILTER_SIZE_63 = 6
|
|
FILTER_SIZE_127 = 7
|
|
|
|
# Power mode settings
|
|
SLEEP_MODE = 0
|
|
FORCED_MODE = 1
|
|
|
|
# Delay related macro declaration
|
|
RESET_PERIOD = 10
|
|
|
|
# SPI memory page settings
|
|
MEM_PAGE0 = 0x10
|
|
MEM_PAGE1 = 0x00
|
|
|
|
# Ambient humidity shift value for compensation
|
|
HUM_REG_SHIFT_VAL = 4
|
|
|
|
# Run gas enable and disable settings
|
|
RUN_GAS_DISABLE = 0
|
|
RUN_GAS_ENABLE = 1
|
|
|
|
# Buffer length macro declaration
|
|
TMP_BUFFER_LENGTH = 40
|
|
REG_BUFFER_LENGTH = 6
|
|
FIELD_DATA_LENGTH = 3
|
|
GAS_REG_BUF_LENGTH = 20
|
|
GAS_HEATER_PROF_LEN_MAX = 10
|
|
|
|
# Settings selector
|
|
OST_SEL = 1
|
|
OSP_SEL = 2
|
|
OSH_SEL = 4
|
|
GAS_MEAS_SEL = 8
|
|
FILTER_SEL = 16
|
|
HCNTRL_SEL = 32
|
|
RUN_GAS_SEL = 64
|
|
NBCONV_SEL = 128
|
|
GAS_SENSOR_SEL = GAS_MEAS_SEL | RUN_GAS_SEL | NBCONV_SEL
|
|
|
|
# Number of conversion settings
|
|
NBCONV_MIN = 0
|
|
NBCONV_MAX = 9 # Was 10, but there are only 10 settings: 0 1 2 ... 8 9
|
|
|
|
# Mask definitions
|
|
GAS_MEAS_MSK = 0x30
|
|
NBCONV_MSK = 0X0F
|
|
FILTER_MSK = 0X1C
|
|
OST_MSK = 0XE0
|
|
OSP_MSK = 0X1C
|
|
OSH_MSK = 0X07
|
|
HCTRL_MSK = 0x08
|
|
RUN_GAS_MSK = 0x10
|
|
MODE_MSK = 0x03
|
|
RHRANGE_MSK = 0x30
|
|
RSERROR_MSK = 0xf0
|
|
NEW_DATA_MSK = 0x80
|
|
GAS_INDEX_MSK = 0x0f
|
|
GAS_RANGE_MSK = 0x0f
|
|
GASM_VALID_MSK = 0x20
|
|
HEAT_STAB_MSK = 0x10
|
|
MEM_PAGE_MSK = 0x10
|
|
SPI_RD_MSK = 0x80
|
|
SPI_WR_MSK = 0x7f
|
|
BIT_H1_DATA_MSK = 0x0F
|
|
|
|
# Bit position definitions for sensor settings
|
|
GAS_MEAS_POS = 4
|
|
FILTER_POS = 2
|
|
OST_POS = 5
|
|
OSP_POS = 2
|
|
OSH_POS = 0
|
|
RUN_GAS_POS = 4
|
|
MODE_POS = 0
|
|
NBCONV_POS = 0
|
|
|
|
# Array Index to Field data mapping for Calibration Data
|
|
T2_LSB_REG = 1
|
|
T2_MSB_REG = 2
|
|
T3_REG = 3
|
|
P1_LSB_REG = 5
|
|
P1_MSB_REG = 6
|
|
P2_LSB_REG = 7
|
|
P2_MSB_REG = 8
|
|
P3_REG = 9
|
|
P4_LSB_REG = 11
|
|
P4_MSB_REG = 12
|
|
P5_LSB_REG = 13
|
|
P5_MSB_REG = 14
|
|
P7_REG = 15
|
|
P6_REG = 16
|
|
P8_LSB_REG = 19
|
|
P8_MSB_REG = 20
|
|
P9_LSB_REG = 21
|
|
P9_MSB_REG = 22
|
|
P10_REG = 23
|
|
H2_MSB_REG = 25
|
|
H2_LSB_REG = 26
|
|
H1_LSB_REG = 26
|
|
H1_MSB_REG = 27
|
|
H3_REG = 28
|
|
H4_REG = 29
|
|
H5_REG = 30
|
|
H6_REG = 31
|
|
H7_REG = 32
|
|
T1_LSB_REG = 33
|
|
T1_MSB_REG = 34
|
|
GH2_LSB_REG = 35
|
|
GH2_MSB_REG = 36
|
|
GH1_REG = 37
|
|
GH3_REG = 38
|
|
|
|
# BME680 register buffer index settings
|
|
REG_FILTER_INDEX = 5
|
|
REG_TEMP_INDEX = 4
|
|
REG_PRES_INDEX = 4
|
|
REG_HUM_INDEX = 2
|
|
REG_NBCONV_INDEX = 1
|
|
REG_RUN_GAS_INDEX = 1
|
|
REG_HCTRL_INDEX = 0
|
|
|
|
# Look up tables for the possible gas range values
|
|
lookupTable1 = [2147483647, 2147483647, 2147483647, 2147483647,
|
|
2147483647, 2126008810, 2147483647, 2130303777, 2147483647,
|
|
2147483647, 2143188679, 2136746228, 2147483647, 2126008810,
|
|
2147483647, 2147483647]
|
|
|
|
lookupTable2 = [4096000000, 2048000000, 1024000000, 512000000,
|
|
255744255, 127110228, 64000000, 32258064,
|
|
16016016, 8000000, 4000000, 2000000,
|
|
1000000, 500000, 250000, 125000]
|
|
|
|
def bytes_to_word(msb, lsb, bits=16, signed=False):
|
|
word = (msb << 8) | lsb
|
|
if signed:
|
|
word = twos_comp(word, bits)
|
|
return word
|
|
|
|
def twos_comp(val, bits=16):
|
|
if val & (1 << (bits - 1)) != 0:
|
|
val = val - (1 << bits)
|
|
return val
|
|
|
|
# Sensor field data structure
|
|
|
|
class FieldData:
|
|
def __init__(self):
|
|
# Contains new_data, gasm_valid & heat_stab
|
|
self.status = None
|
|
self.heat_stable = False
|
|
# The index of the heater profile used
|
|
self.gas_index = None
|
|
# Measurement index to track order
|
|
self.meas_index = None
|
|
# Temperature in degree celsius x100
|
|
self.temperature = None
|
|
# Pressure in Pascal
|
|
self.pressure = None
|
|
# Humidity in % relative humidity x1000
|
|
self.humidity = None
|
|
# Gas resistance in Ohms
|
|
self.gas_resistance = None
|
|
|
|
# Structure to hold the Calibration data
|
|
|
|
class CalibrationData:
|
|
def __init__(self):
|
|
self.par_h1 = None
|
|
self.par_h2 = None
|
|
self.par_h3 = None
|
|
self.par_h4 = None
|
|
self.par_h5 = None
|
|
self.par_h6 = None
|
|
self.par_h7 = None
|
|
self.par_gh1 = None
|
|
self.par_gh2 = None
|
|
self.par_gh3 = None
|
|
self.par_t1 = None
|
|
self.par_t2 = None
|
|
self.par_t3 = None
|
|
self.par_p1 = None
|
|
self.par_p2 = None
|
|
self.par_p3 = None
|
|
self.par_p4 = None
|
|
self.par_p5 = None
|
|
self.par_p6 = None
|
|
self.par_p7 = None
|
|
self.par_p8 = None
|
|
self.par_p9 = None
|
|
self.par_p10 = None
|
|
# Variable to store t_fine size
|
|
self.t_fine = None
|
|
# Variable to store heater resistance range
|
|
self.res_heat_range = None
|
|
# Variable to store heater resistance value
|
|
self.res_heat_val = None
|
|
# Variable to store error range
|
|
self.range_sw_err = None
|
|
|
|
def set_from_array(self, calibration):
|
|
# Temperature related coefficients
|
|
self.par_t1 = bytes_to_word(calibration[T1_MSB_REG], calibration[T1_LSB_REG])
|
|
self.par_t2 = bytes_to_word(calibration[T2_MSB_REG], calibration[T2_LSB_REG], bits=16, signed=True)
|
|
self.par_t3 = twos_comp(calibration[T3_REG], bits=8)
|
|
|
|
# Pressure related coefficients
|
|
self.par_p1 = bytes_to_word(calibration[P1_MSB_REG], calibration[P1_LSB_REG])
|
|
self.par_p2 = bytes_to_word(calibration[P2_MSB_REG], calibration[P2_LSB_REG], bits=16, signed=True)
|
|
self.par_p3 = twos_comp(calibration[P3_REG], bits=8)
|
|
self.par_p4 = bytes_to_word(calibration[P4_MSB_REG], calibration[P4_LSB_REG], bits=16, signed=True)
|
|
self.par_p5 = bytes_to_word(calibration[P5_MSB_REG], calibration[P5_LSB_REG], bits=16, signed=True)
|
|
self.par_p6 = twos_comp(calibration[P6_REG], bits=8)
|
|
self.par_p7 = twos_comp(calibration[P7_REG], bits=8)
|
|
self.par_p8 = bytes_to_word(calibration[P8_MSB_REG], calibration[P8_LSB_REG], bits=16, signed=True)
|
|
self.par_p9 = bytes_to_word(calibration[P9_MSB_REG], calibration[P9_LSB_REG], bits=16, signed=True)
|
|
self.par_p10 = calibration[P10_REG]
|
|
|
|
# Humidity related coefficients
|
|
self.par_h1 = (calibration[H1_MSB_REG] << HUM_REG_SHIFT_VAL) | (calibration[H1_LSB_REG] & BIT_H1_DATA_MSK)
|
|
self.par_h2 = (calibration[H2_MSB_REG] << HUM_REG_SHIFT_VAL) | (calibration[H2_LSB_REG] >> HUM_REG_SHIFT_VAL)
|
|
self.par_h3 = twos_comp(calibration[H3_REG], bits=8)
|
|
self.par_h4 = twos_comp(calibration[H4_REG], bits=8)
|
|
self.par_h5 = twos_comp(calibration[H5_REG], bits=8)
|
|
self.par_h6 = calibration[H6_REG]
|
|
self.par_h7 = twos_comp(calibration[H7_REG], bits=8)
|
|
|
|
# Gas heater related coefficients
|
|
self.par_gh1 = twos_comp(calibration[GH1_REG], bits=8)
|
|
self.par_gh2 = bytes_to_word(calibration[GH2_MSB_REG], calibration[GH2_LSB_REG], bits=16, signed=True)
|
|
self.par_gh3 = twos_comp(calibration[GH3_REG], bits=8)
|
|
|
|
def set_other(self, heat_range, heat_value, sw_error):
|
|
self.res_heat_range = (heat_range & RHRANGE_MSK) // 16
|
|
self.res_heat_val = heat_value
|
|
self.range_sw_err = (sw_error * RSERROR_MSK) // 16
|
|
|
|
# BME680 sensor settings structure which comprises of ODR,
|
|
# over-sampling and filter settings.
|
|
|
|
class TPHSettings:
|
|
def __init__(self):
|
|
# Humidity oversampling
|
|
self.os_hum = None
|
|
# Temperature oversampling
|
|
self.os_temp = None
|
|
# Pressure oversampling
|
|
self.os_pres = None
|
|
# Filter coefficient
|
|
self.filter = None
|
|
|
|
# BME680 gas sensor which comprises of gas settings
|
|
## and status parameters
|
|
|
|
class GasSettings:
|
|
def __init__(self):
|
|
# Variable to store nb conversion
|
|
self.nb_conv = None
|
|
# Variable to store heater control
|
|
self.heatr_ctrl = None
|
|
# Run gas enable value
|
|
self.run_gas = None
|
|
# Pointer to store heater temperature
|
|
self.heatr_temp = None
|
|
# Pointer to store duration profile
|
|
self.heatr_dur = None
|
|
|
|
# BME680 device structure
|
|
|
|
class BME680Data:
|
|
def __init__(self):
|
|
# Chip Id
|
|
self.chip_id = None
|
|
# Device Id
|
|
self.dev_id = None
|
|
# SPI/I2C interface
|
|
self.intf = None
|
|
# Memory page used
|
|
self.mem_page = None
|
|
# Ambient temperature in Degree C
|
|
self.ambient_temperature = None
|
|
# Field Data
|
|
self.data = FieldData()
|
|
# Sensor calibration data
|
|
self.calibration_data = CalibrationData()
|
|
# Sensor settings
|
|
self.tph_settings = TPHSettings()
|
|
# Gas Sensor settings
|
|
self.gas_settings = GasSettings()
|
|
# Sensor power modes
|
|
self.power_mode = None
|
|
# New sensor fields
|
|
self.new_fields = None
|