cn/python-bme680
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Added bit setting, docstrings

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This commit is contained in:
Phil Howard 2017-10-17 11:23:41 +01:00
parent 9619dfce3e
commit b4013106dc
2 changed files with 88 additions and 42 deletions
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129
bme680/__init__.py
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@ -29,80 +29,127 @@ class BME680(BME680Data):
self.get_sensor_data()
def _get_calibration_data(self):
"""Retrieves the sensor calibration data and stores it in .calibration_data"""
calibration = self._get_regs(COEFF_ADDR1, COEFF_ADDR1_LEN)
calibration += self._get_regs(COEFF_ADDR2, COEFF_ADDR2_LEN)
heat_range = self._get_regs(ADDR_RES_HEAT_RANGE_ADDR, 1)
heat_value = twos_comp(self._get_regs(ADDR_RES_HEAT_VAL_ADDR, 1), bits=8)
sw_error = twos_comp(self._get_regs(ADDR_RANGE_SW_ERR_ADDR, 1), bits=8)
self.calibration_data.set_from_array(calibration)
self.calibration_data.set_other(heat_range, heat_value, sw_error)
def soft_reset(self):
"""Initiate a soft reset"""
self._set_regs(SOFT_RESET_ADDR, SOFT_RESET_CMD)
time.sleep(RESET_PERIOD / 1000.0)
def set_humidity_oversample(self, value):
"""Set humidity oversampling"""
self.tph_settings.os_hum = value
temp = self._get_regs(CONF_OS_H_ADDR, 1)
temp &= ~OSH_MSK
temp |= value << OSH_POS
self._set_regs(CONF_OS_H_ADDR, temp)
self._set_bits(CONF_OS_H_ADDR, OSH_MSK, OSH_POS, value)
#temp = self._get_regs(CONF_OS_H_ADDR, 1)
#temp &= ~OSH_MSK
#temp |= value << OSH_POS
#self._set_regs(CONF_OS_H_ADDR, temp)
def get_humidity_oversample(self):
"""Get humidity oversampling"""
return (self._get_regs(CONF_OS_H_ADDR, 1) & OSH_MSK) >> OSH_POS
def set_pressure_oversample(self, value):
"""Set temperature oversampling"""
self.tph_settings.os_pres = value
temp = self._get_regs(CONF_T_P_MODE_ADDR, 1)
temp &= ~OSP_MSK
temp |= value << OSP_POS
self._set_regs(CONF_T_P_MODE_ADDR, temp)
self._set_bits(CONF_T_P_MODE_ADDR, OSP_MSK, OSP_POS, value)
#temp = self._get_regs(CONF_T_P_MODE_ADDR, 1)
#temp &= ~OSP_MSK
#temp |= value << OSP_POS
#self._set_regs(CONF_T_P_MODE_ADDR, temp)
def get_pressure_oversample(self):
"""Get pressure oversampling"""
return (self._get_regs(CONF_T_P_MODE_ADDR, 1) & OSP_MSK) >> OSP_POS
def set_temperature_oversample(self, value):
"""Set pressure oversampling"""
self.tph_settings.os_temp = value
temp = self._get_regs(CONF_T_P_MODE_ADDR, 1)
temp &= ~OST_MSK
temp |= value << OST_POS
self._set_regs(CONF_T_P_MODE_ADDR, temp)
self._set_bits(CONF_T_P_MODE_ADDR, OST_MSK, OST_POS, value)
#temp = self._get_regs(CONF_T_P_MODE_ADDR, 1)
#temp &= ~OST_MSK
#temp |= value << OST_POS
#self._set_regs(CONF_T_P_MODE_ADDR, temp)
def get_temperature_oversample(self):
"""Get temperature oversampling"""
return (self._get_regs(CONF_T_P_MODE_ADDR, 1) & OST_MSK) >> OST_POS
def set_filter(self, value):
"""Set filter size"""
self.tph_settings.filter = value
temp = self._get_regs(CONF_ODR_FILT_ADDR, 1)
temp &= ~FILTER_MSK
temp |= value << FILTER_POS
self._set_regs(CONF_ODR_FILT_ADDR, temp)
self._set_bits(CONF_ODR_FILT_ADDR, FILTER_MSK, FILTER_POS, value)
#temp = self._get_regs(CONF_ODR_FILT_ADDR, 1)
#temp &= ~FILTER_MSK
#temp |= value << FILTER_POS
#self._set_regs(CONF_ODR_FILT_ADDR, temp)
def get_filter(self):
"""Get filter size"""
return (self._get_regs(CONF_ODR_FILT_ADDR, 1) & FILTER_MSK) >> FILTER_POS
def set_gas_status(self, value):
temp = self._get_regs(CONF_ODR_RUN_GAS_NBC_ADDR, 1)
temp &= ~RUN_GAS_MSK
temp |= (value << RUN_GAS_POS)
"""Enable/disable gas sensor"""
self.gas_settings.run_gas = value
self._set_regs(CONF_ODR_RUN_GAS_NBC_ADDR, temp)
self._set_bits(CONF_ODR_RUN_GAS_NBC_ADDR, RUN_GAS_MSK, RUN_GAS_POS, value)
#temp = self._get_regs(CONF_ODR_RUN_GAS_NBC_ADDR, 1)
#temp &= ~RUN_GAS_MSK
#temp |= (value << RUN_GAS_POS)
#self._set_regs(CONF_ODR_RUN_GAS_NBC_ADDR, temp)
def get_gas_status(self):
"""Get the current gas status"""
return (self._get_regs(CONF_ODR_RUN_GAS_NBC_ADDR, 1) & RUN_GAS_MSK) >> RUN_GAS_POS
def set_gas_heater_temperature(self, value):
"""Set gas sensor heater temperature"""
self.gas_settings.heatr_temp = value
temp = self._calc_heater_resistance(self.gas_settings.heatr_temp)
self._set_regs(RES_HEAT0_ADDR, temp)
def set_gas_heater_duration(self, value):
"""Set gas sensor heater duration"""
self.gas_settings.heatr_dur = value
temp = self._calc_heater_duration(self.gas_settings.heatr_dur)
self._set_regs(GAS_WAIT0_ADDR, temp)
def set_power_mode(self, value, blocking=True):
"""Set power mode"""
if value not in (SLEEP_MODE, FORCED_MODE):
print("Power mode should be one of SLEEP_MODE or FORCED_MODE")
self.power_mode = value
temp = self._get_regs(CONF_T_P_MODE_ADDR, 1)
temp &= ~ MODE_MSK
temp |= self.power_mode
self._set_regs(CONF_T_P_MODE_ADDR, temp)
self._set_bits(CONF_T_P_MODE_ADDR, MODE_MSK, MODE_POS, value)
#temp = self._get_regs(CONF_T_P_MODE_ADDR, 1)
#temp &= ~ MODE_MSK
#temp |= self.power_mode
#self._set_regs(CONF_T_P_MODE_ADDR, temp)
while blocking and self.get_power_mode() != self.power_mode:
time.sleep(POLL_PERIOD_MS / 1000.0)
def get_power_mode(self):
"""Get power mode"""
self.power_mode = self._get_regs(CONF_T_P_MODE_ADDR, 1)
return self.power_mode
def set_profile_duration(self, duration):
pass
def get_profile_duration(self):
pass
def get_sensor_data(self):
"""Get sensor data.
Stores data in .data and returns True upon success.
"""
self.set_power_mode(FORCED_MODE)
tries = 10
@ -138,29 +185,27 @@ class BME680(BME680Data):
return False
def _set_bits(self, register, mask, position, value):
"""Mask out and set one or more bits in a register"""
temp = self._get_regs(register, 1)
temp &= ~mask
temp |= value << position
self._set_regs(register, temp)
def _set_regs(self, register, value):
"""Set one or more registers"""
if isinstance(value, int):
self._i2c.write_byte_data(self.i2c_addr, register, value)
else:
self._i2c.write_i2c_block_data(self.i2c_addr, register, value)
def _get_regs(self, register, length):
"""Get one or more registers"""
if length == 1:
return self._i2c.read_byte_data(self.i2c_addr, register)
else:
return self._i2c.read_i2c_block_data(self.i2c_addr, register, length)
def _get_calibration_data(self):
calibration = self._get_regs(COEFF_ADDR1, COEFF_ADDR1_LEN)
calibration += self._get_regs(COEFF_ADDR2, COEFF_ADDR2_LEN)
heat_range = self._get_regs(ADDR_RES_HEAT_RANGE_ADDR, 1)
heat_value = twos_comp(self._get_regs(ADDR_RES_HEAT_VAL_ADDR, 1), bits=8)
sw_error = twos_comp(self._get_regs(ADDR_RANGE_SW_ERR_ADDR, 1), bits=8)
self.calibration_data.set_from_array(calibration)
self.calibration_data.set_other(heat_range, heat_value, sw_error)
def _calc_temperature(self, temperature_adc):
var1 = (temperature_adc / 8) - (self.calibration_data.par_t1 * 2)
var2 = (var1 * self.calibration_data.par_t2) / 2048
@ -233,7 +278,7 @@ class BME680(BME680Data):
heatr_res_x100 = (((var4 / var5) - 250) * 34)
heatr_res = ((heatr_res_x100 + 50) / 100)
return int(heatr_res)
return heatr_res
def _calc_heater_duration(self, duration):
if duration < 0xfc0:

1
bme680/constants.py
View File

@ -164,6 +164,7 @@ OST_POS = 5
OSP_POS = 2
OSH_POS = 0
RUN_GAS_POS = 4
MODE_MSK = 0
# Array Index to Field data mapping for Calibration Data
T2_LSB_REG = 1