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BMP280.py
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import time
from py_bmp280.I2CDevice import I2CDevice
from py_bmp280.Exceptions import BMP280Error
class BMP280(I2CDevice):
data = {
'CHIP_IDs': [0x56, 0x57, 0x58],
'I2C_ADDRESS': [0x76, 0x77],
# POWER MODE
'SLEEP_MODE': 0x00,
'FORCED_MODE': 0x01,
'NORMAL_MODE': 0x03,
'SOFT_RESET': 0xB6,
# OVERSAMPLING
'OVERSAMPLING_SKIP': 0x00,
# FILTERING
'FILTER_COEFF_OFF': 0x00,
'FILTER_COEFF_2': 0x01,
'FILTER_COEFF_4': 0x02,
'FILTER_COEFF_8': 0x03,
'FILTER_COEFF_16': 0x04,
# STANDBY TIME
'STANDBY_TIME_1_MS': 0x00,
'STANDBY_TIME_63_MS': 0x01,
'STANDBY_TIME_125_MS': 0x02,
'STANDBY_TIME_250_MS': 0x03,
'STANDBY_TIME_500_MS': 0x04,
'STANDBY_TIME_1000_MS': 0x05,
'STANDBY_TIME_2000_MS': 0x06,
'STANDBY_TIME_4000_MS': 0x07,
# WORKING MODE
'ULTRA_LOW_POWER_MODE': 0x00,
'LOW_POWER_MODE': 0x01,
'STANDART_POWER_MODE': 0x02,
'HIGH_RESOLUTION_MODE': 0x04,
'ULTRA_HIGH_RESOLUTION_MODE': 0x03,
'ULTRALOWPOWER_OVERSAMPLING_PRESSURE': 0x01, # X1
'ULTRALOWPOWER_OVERSAMPLING_TEMPERATURE': 0x01, # X1
'LOWPOWER_OVERSAMPLING_PRESSURE': 0x02, # X2
'LOWPOWER_OVERSAMPLING_TEMPERATURE': 0x01, # X1
'STANDART_OVERSAMPLING_PRESSURE': 0x03, # X4
'STANDART_OVERSAMPLING_TEMPERATURE': 0x01, # X1
'HIGH_OVERSAMPLING_PRESSURE': 0x04, # X8
'HIGH_OVERSAMPLING_TEMPERATURE': 0x01, # X1
'ULTRAHIGH_OVERSAMPLING_PRESSURE': 0x05, # X16
'ULTRAHIGH_OVERSAMPLING_TEMPERATURE': 0x02, # X2
'SEA_LEVEL_PRESSURE': 1013
}
regs = {
'CHIPID': 0xD0, # [7:0] Chip ID
'VERSION': 0xD1, # [7:0] Microcode version
'SOFTRESET': 0xE0, # If 0xB6 written, start reset procedure
'CAL26': 0xE1, # Stored in 0xE1:0xF0
'STATUS': 0xF3, # 3 - measuring, 0 - really idk what is it
'CONTROL': 0xF4, # [7:5] - Temp Oversampling, [4:2] - Pressure Oversampling, [1:0] - power mode
'CONFIG': 0xF5, # [7:5] - StandBy Time, [4:2] - Filter, 0 - spi3w_en
'PMSB': 0xF7, # [7:0] => [19:12] pressiure bits
'PLSB': 0xF8, # [7:0] => [11:4] pressiure bits
'PXLSB': 0xF9, # [7:4] => [3:0] pressiure bits
'TMSB': 0xFA, # [7:0] => [19:12] temperature bits
'TLSB': 0xFB, # [7:0] => [11:4] temperature bits
'TXLSB': 0xFC, # [7:4] => [3:0] temperature bits
'DIG_T1': 0x88, #
'DIG_T2': 0x8A, #
'DIG_T3': 0x8C, #
'DIG_P1': 0x8E, #
'DIG_P2': 0x90, #
'DIG_P3': 0x92, # NVM writted trimming parameters for compensation
'DIG_P4': 0x94, #
'DIG_P5': 0x96, #
'DIG_P6': 0x98, #
'DIG_P7': 0x9A, #
'DIG_P8': 0x9C, #
'DIG_P9': 0x9E #
}
def _getChipID(self):
return I2CDevice.read_byte(self, self.regs['CHIPID'])
def _get_calibration_data(self):
self.calibration_data['T1'] = I2CDevice.read_byte(self, self.regs['DIG_T1'])
self.calibration_data['T2'] = I2CDevice.read_byte(self, self.regs['DIG_T2'])
self.calibration_data['T3'] = I2CDevice.read_byte(self, self.regs['DIG_T3'])
self.calibration_data['P1'] = I2CDevice.read_byte(self, self.regs['DIG_P1'])
self.calibration_data['P2'] = I2CDevice.read_byte(self, self.regs['DIG_P2'])
self.calibration_data['P3'] = I2CDevice.read_byte(self, self.regs['DIG_P3'])
self.calibration_data['P4'] = I2CDevice.read_byte(self, self.regs['DIG_P4'])
self.calibration_data['P5'] = I2CDevice.read_byte(self, self.regs['DIG_P5'])
self.calibration_data['P6'] = I2CDevice.read_byte(self, self.regs['DIG_P6'])
self.calibration_data['P7'] = I2CDevice.read_byte(self, self.regs['DIG_P7'])
self.calibration_data['P8'] = I2CDevice.read_byte(self, self.regs['DIG_P8'])
self.calibration_data['P9'] = I2CDevice.read_byte(self, self.regs['DIG_P9'])
def _get_raw_data(self):
self.raw_data['plsb'] = I2CDevice.read_byte(self, self.regs['PLSB'])
self.raw_data['pmsb'] = I2CDevice.read_byte(self, self.regs['PMSB'])
self.raw_data['pxsb'] = I2CDevice.read_byte(self, self.regs['PXLSB'])
self.raw_data['tlsb'] = I2CDevice.read_byte(self, self.regs['TLSB'])
self.raw_data['tmsb'] = I2CDevice.read_byte(self, self.regs['TMSB'])
self.raw_data['txsb'] = I2CDevice.read_byte(self, self.regs['TXLSB'])
temp = 0
temp = (temp | self.raw_data['tmsb']) << 8;
temp = (temp | self.raw_data['tlsb']) << 8;
temp = (temp | self.raw_data['txsb']) >> 4;
self.raw_data['temperature'] = temp
temp = 0
temp = (temp | self.raw_data['pmsb']) << 8;
temp = (temp | self.raw_data['plsb']) << 8;
temp = (temp | self.raw_data['pxsb']) >> 4;
self.raw_data['pressure'] = temp
def __init__(self, bus=-1, addr=-1):
if addr == -1:
try:
I2CDevice.__init__(self, bus, self.data['I2C_ADDRESS'][0])
except OSError:
try:
I2CDevice.__init__(self, bus, self.data['I2C_ADDRESS'][1])
except:
raise BMP280Error("Device Not Found")
else:
I2CDevice.__init__(self, bus, addr)
def update(self):
self._get_raw_data()
self.temp = getCelsium(self.raw_data['temperature'])
def getCelsium(self, t_adc):
var1 = ((t_adc)/16384.0 - (self.calibration_data['T1'])/1024.0) * (self.calibration_data['T2']);
var2 = (((t_adc)/131072.0 - (self.calibration_data['T1'])/8192.0) * ((t_adc)/131072.0 - ( self.calibration_data['T1'])/8192.0)) * (self.calibration_data['T3'])
T = (var1 + var2) / 5120.0
return T
def getCelsiumExperimental(self, t_adc):
v1 = ((((t_adc >> 3) - (self.calibration_data['T1'] << 1))) *
( self.calibration_data['T2'])) >> 11
v2 = (((((t_adc >> 4) - ( self.calibration_data['T1'])) *
((t_adc >> 4) - ( self.calibration_data['T1']))) >> 12) *
( self.calibration_data['T3'])) >> 14;
return ((v1 + v2) * 5 + 128) >> 8
def reset(self):
I2CDevice.write_byte(self, self.regs['SOFTRESET'], self.data['SOFT_RESET'])
def getStatus(self):
return I2CDevice.read_byte(self, self.regs['STATUS'])
def getControl(self):
return I2CDevice.read_byte(self, self.regs['CONTROL'])
def setControl(self, value):
I2CDevice.write_byte(self, self.regs['CONTROL'], value)
def getConfig(self):
return I2CDevice.read_byte(self, self.regs['CONFIG'])
def setConfig(self, value):
I2CDevice.write_byte(self, self.regs['CONFIG'], value)
def setTemperatureOversampling(self, value):
curentOversampling = self.getControl() & 0b00011111
self.setControl(curentOversampling | (value << 5))
def setPowerMode(self, mode):
curentMode = self.getControl() & 0b11111100
self.setControl(curentMode | mode)
def setStandByTime(self, time):
config = self.getConfig() & 0b00011111
self.setConfig(config | (time << 5))
def setIrrFilter(self, value):
config = self.getConfig() & 0b11100011
self.setConfig(config | (value << 2))
def init(self):
self.chipID = self._getChipID()
if not self.chipID in self.data['CHIP_IDs']:
raise BMP280Error("Unknown ChipID. Your ChipID is {}".format(self.chipID))
self.reset()
self.setPowerMode(self.data['NORMAL_MODE'])
self.setTemperatureOversampling(self.data['ULTRAHIGH_OVERSAMPLING_TEMPERATURE'])
self.setIrrFilter(self.data['FILTER_COEFF_16'])
self.setStandByTime(self.data['STANDBY_TIME_250_MS'])
self.calibration_data = dict()
self._get_calibration_data()
self.raw_data = dict()
self._get_raw_data()
self.update()