cn/python-bme680
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Fixed types of calibration data

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This commit is contained in:
Phil Howard 2017-10-16 15:06:45 +01:00
parent 9012109c30
commit cd3649a74f
3 changed files with 33 additions and 21 deletions
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4
.gitignore vendored
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@ -1 +1,5 @@
*.py[cod] *.py[cod]
*.o
*.a
*.so
BME680_driver/main

4
bme680/__init__.py
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@ -150,8 +150,8 @@ class BME680(BME680Data):
calibration += self._get_regs(COEFF_ADDR2, COEFF_ADDR2_LEN) calibration += self._get_regs(COEFF_ADDR2, COEFF_ADDR2_LEN)
heat_range = self._get_regs(ADDR_RES_HEAT_RANGE_ADDR, 1) heat_range = self._get_regs(ADDR_RES_HEAT_RANGE_ADDR, 1)
heat_value = self._get_regs(ADDR_RES_HEAT_VAL_ADDR, 1) heat_value = twos_comp(self._get_regs(ADDR_RES_HEAT_VAL_ADDR, 1), bits=8)
sw_error = self._get_regs(ADDR_RANGE_SW_ERR_ADDR, 1) 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_from_array(calibration)
self.calibration_data.set_other(heat_range, heat_value, sw_error) self.calibration_data.set_other(heat_range, heat_value, sw_error)

46
bme680/constants.py
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@ -221,8 +221,16 @@ lookupTable2 = [4096000000, 2048000000, 1024000000, 512000000,
16016016, 8000000, 4000000, 2000000, 16016016, 8000000, 4000000, 2000000,
1000000, 500000, 250000, 125000] 1000000, 500000, 250000, 125000]
def bytes_to_word(msb, lsb): def bytes_to_word(msb, lsb, bits=16, signed=False):
return (msb << 8) | lsb 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 # Sensor field data structure
@ -282,34 +290,34 @@ class CalibrationData:
def set_from_array(self, calibration): def set_from_array(self, calibration):
# Temperature related coefficients # Temperature related coefficients
self.par_t1 = bytes_to_word(calibration[T1_MSB_REG], calibration[T1_LSB_REG]) 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]) self.par_t2 = bytes_to_word(calibration[T2_MSB_REG], calibration[T2_LSB_REG], bits=16, signed=True)
self.par_t3 = calibration[T3_REG] self.par_t3 = twos_comp(calibration[T3_REG], bits=8)
# Pressure related coefficients # Pressure related coefficients
self.par_p1 = bytes_to_word(calibration[P1_MSB_REG], calibration[P1_LSB_REG]) 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]) self.par_p2 = bytes_to_word(calibration[P2_MSB_REG], calibration[P2_LSB_REG], bits=16, signed=True)
self.par_p3 = calibration[P3_REG] self.par_p3 = twos_comp(calibration[P3_REG], bits=8)
self.par_p4 = bytes_to_word(calibration[P4_MSB_REG], calibration[P4_LSB_REG]) 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]) self.par_p5 = bytes_to_word(calibration[P5_MSB_REG], calibration[P5_LSB_REG], bits=16, signed=True)
self.par_p6 = calibration[P6_REG] self.par_p6 = twos_comp(calibration[P6_REG], bits=8)
self.par_p7 = calibration[P7_REG] self.par_p7 = twos_comp(calibration[P7_REG], bits=8)
self.par_p8 = bytes_to_word(calibration[P8_MSB_REG], calibration[P8_LSB_REG]) 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]) self.par_p9 = bytes_to_word(calibration[P9_MSB_REG], calibration[P9_LSB_REG], bits=16, signed=True)
self.par_p10 = calibration[P10_REG] self.par_p10 = calibration[P10_REG]
# Humidity related coefficients # Humidity related coefficients
self.par_h1 = (calibration[H1_MSB_REG] << HUM_REG_SHIFT_VAL) | (calibration[H1_LSB_REG] & BIT_H1_DATA_MSK) 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_h2 = (calibration[H2_MSB_REG] << HUM_REG_SHIFT_VAL) | (calibration[H2_LSB_REG] >> HUM_REG_SHIFT_VAL)
self.par_h3 = calibration[H3_REG] self.par_h3 = twos_comp(calibration[H3_REG], bits=8)
self.par_h4 = calibration[H4_REG] self.par_h4 = twos_comp(calibration[H4_REG], bits=8)
self.par_h5 = calibration[H5_REG] self.par_h5 = twos_comp(calibration[H5_REG], bits=8)
self.par_h6 = calibration[H6_REG] self.par_h6 = calibration[H6_REG]
self.par_h7 = calibration[H7_REG] self.par_h7 = twos_comp(calibration[H7_REG], bits=8)
# Gas heater related coefficients # Gas heater related coefficients
self.par_gh1 = calibration[GH1_REG] self.par_gh1 = twos_comp(calibration[GH1_REG], bits=8)
self.par_gh2 = bytes_to_word(calibration[GH2_MSB_REG], calibration[GH2_LSB_REG]) self.par_gh2 = bytes_to_word(calibration[GH2_MSB_REG], calibration[GH2_LSB_REG], bits=16, signed=True)
self.par_gh3 = calibration[GH3_REG] self.par_gh3 = twos_comp(calibration[GH3_REG], bits=8)
def set_other(self, heat_range, heat_value, sw_error): def set_other(self, heat_range, heat_value, sw_error):
self.res_heat_range = (heat_range & RHRANGE_MSK) / 16 self.res_heat_range = (heat_range & RHRANGE_MSK) / 16