mirror of
https://github.com/alexandrebobkov/ESP-Nodes.git
synced 2024-10-05 20:47:50 -04:00
322 lines
9.8 KiB
Python
322 lines
9.8 KiB
Python
from micropython import const
|
|
from ustruct import unpack as unp
|
|
|
|
# Author David Stenwall Wahlund (david at dafnet.se)
|
|
|
|
# Power Modes
|
|
BMP280_POWER_SLEEP = const(0)
|
|
BMP280_POWER_FORCED = const(1)
|
|
BMP280_POWER_NORMAL = const(3)
|
|
|
|
BMP280_SPI3W_ON = const(1)
|
|
BMP280_SPI3W_OFF = const(0)
|
|
|
|
BMP280_TEMP_OS_SKIP = const(0)
|
|
BMP280_TEMP_OS_1 = const(1)
|
|
BMP280_TEMP_OS_2 = const(2)
|
|
BMP280_TEMP_OS_4 = const(3)
|
|
BMP280_TEMP_OS_8 = const(4)
|
|
BMP280_TEMP_OS_16 = const(5)
|
|
|
|
BMP280_PRES_OS_SKIP = const(0)
|
|
BMP280_PRES_OS_1 = const(1)
|
|
BMP280_PRES_OS_2 = const(2)
|
|
BMP280_PRES_OS_4 = const(3)
|
|
BMP280_PRES_OS_8 = const(4)
|
|
BMP280_PRES_OS_16 = const(5)
|
|
|
|
# Standby settings in ms
|
|
BMP280_STANDBY_0_5 = const(0)
|
|
BMP280_STANDBY_62_5 = const(1)
|
|
BMP280_STANDBY_125 = const(2)
|
|
BMP280_STANDBY_250 = const(3)
|
|
BMP280_STANDBY_500 = const(4)
|
|
BMP280_STANDBY_1000 = const(5)
|
|
BMP280_STANDBY_2000 = const(6)
|
|
BMP280_STANDBY_4000 = const(7)
|
|
|
|
# IIR Filter setting
|
|
BMP280_IIR_FILTER_OFF = const(0)
|
|
BMP280_IIR_FILTER_2 = const(1)
|
|
BMP280_IIR_FILTER_4 = const(2)
|
|
BMP280_IIR_FILTER_8 = const(3)
|
|
BMP280_IIR_FILTER_16 = const(4)
|
|
|
|
# Oversampling setting
|
|
BMP280_OS_ULTRALOW = const(0)
|
|
BMP280_OS_LOW = const(1)
|
|
BMP280_OS_STANDARD = const(2)
|
|
BMP280_OS_HIGH = const(3)
|
|
BMP280_OS_ULTRAHIGH = const(4)
|
|
|
|
# Oversampling matrix
|
|
# (PRESS_OS, TEMP_OS, sample time in ms)
|
|
_BMP280_OS_MATRIX = [
|
|
[BMP280_PRES_OS_1, BMP280_TEMP_OS_1, 7],
|
|
[BMP280_PRES_OS_2, BMP280_TEMP_OS_1, 9],
|
|
[BMP280_PRES_OS_4, BMP280_TEMP_OS_1, 14],
|
|
[BMP280_PRES_OS_8, BMP280_TEMP_OS_1, 23],
|
|
[BMP280_PRES_OS_16, BMP280_TEMP_OS_2, 44]
|
|
]
|
|
|
|
# Use cases
|
|
BMP280_CASE_HANDHELD_LOW = const(0)
|
|
BMP280_CASE_HANDHELD_DYN = const(1)
|
|
BMP280_CASE_WEATHER = const(2)
|
|
BMP280_CASE_FLOOR = const(3)
|
|
BMP280_CASE_DROP = const(4)
|
|
BMP280_CASE_INDOOR = const(5)
|
|
|
|
_BMP280_CASE_MATRIX = [
|
|
[BMP280_POWER_NORMAL, BMP280_OS_ULTRAHIGH, BMP280_IIR_FILTER_4, BMP280_STANDBY_62_5],
|
|
[BMP280_POWER_NORMAL, BMP280_OS_STANDARD, BMP280_IIR_FILTER_16, BMP280_STANDBY_0_5],
|
|
[BMP280_POWER_FORCED, BMP280_OS_ULTRALOW, BMP280_IIR_FILTER_OFF, BMP280_STANDBY_0_5],
|
|
[BMP280_POWER_NORMAL, BMP280_OS_STANDARD, BMP280_IIR_FILTER_4, BMP280_STANDBY_125],
|
|
[BMP280_POWER_NORMAL, BMP280_OS_LOW, BMP280_IIR_FILTER_OFF, BMP280_STANDBY_0_5],
|
|
[BMP280_POWER_NORMAL, BMP280_OS_ULTRAHIGH, BMP280_IIR_FILTER_16, BMP280_STANDBY_0_5]
|
|
]
|
|
|
|
_BMP280_REGISTER_ID = const(0xD0)
|
|
_BMP280_REGISTER_RESET = const(0xE0)
|
|
_BMP280_REGISTER_STATUS = const(0xF3)
|
|
_BMP280_REGISTER_CONTROL = const(0xF4)
|
|
_BMP280_REGISTER_CONFIG = const(0xF5) # IIR filter config
|
|
|
|
_BMP280_REGISTER_DATA = const(0xF7)
|
|
|
|
|
|
class BMP280:
|
|
def __init__(self, i2c_bus, addr=0x76, use_case=BMP280_CASE_HANDHELD_DYN):
|
|
self._bmp_i2c = i2c_bus
|
|
self._i2c_addr = addr
|
|
|
|
# read calibration data
|
|
# < little-endian
|
|
# H unsigned short
|
|
# h signed short
|
|
self._T1 = unp('<H', self._read(0x88, 2))[0]
|
|
self._T2 = unp('<h', self._read(0x8A, 2))[0]
|
|
self._T3 = unp('<h', self._read(0x8C, 2))[0]
|
|
self._P1 = unp('<H', self._read(0x8E, 2))[0]
|
|
self._P2 = unp('<h', self._read(0x90, 2))[0]
|
|
self._P3 = unp('<h', self._read(0x92, 2))[0]
|
|
self._P4 = unp('<h', self._read(0x94, 2))[0]
|
|
self._P5 = unp('<h', self._read(0x96, 2))[0]
|
|
self._P6 = unp('<h', self._read(0x98, 2))[0]
|
|
self._P7 = unp('<h', self._read(0x9A, 2))[0]
|
|
self._P8 = unp('<h', self._read(0x9C, 2))[0]
|
|
self._P9 = unp('<h', self._read(0x9E, 2))[0]
|
|
|
|
# output raw
|
|
self._t_raw = 0
|
|
self._t_fine = 0
|
|
self._t = 0
|
|
|
|
self._p_raw = 0
|
|
self._p = 0
|
|
|
|
self.read_wait_ms = 0 # interval between forced measure and readout
|
|
self._new_read_ms = 200 # interval between
|
|
self._last_read_ts = 0
|
|
|
|
if use_case is not None:
|
|
self.use_case(use_case)
|
|
|
|
def _read(self, addr, size=1):
|
|
return self._bmp_i2c.readfrom_mem(self._i2c_addr, addr, size)
|
|
|
|
def _write(self, addr, b_arr):
|
|
if not type(b_arr) is bytearray:
|
|
b_arr = bytearray([b_arr])
|
|
return self._bmp_i2c.writeto_mem(self._i2c_addr, addr, b_arr)
|
|
|
|
def _gauge(self):
|
|
# TODO limit new reads
|
|
# read all data at once (as by spec)
|
|
d = self._read(_BMP280_REGISTER_DATA, 6)
|
|
|
|
self._p_raw = (d[0] << 12) + (d[1] << 4) + (d[2] >> 4)
|
|
self._t_raw = (d[3] << 12) + (d[4] << 4) + (d[5] >> 4)
|
|
|
|
self._t_fine = 0
|
|
self._t = 0
|
|
self._p = 0
|
|
|
|
def reset(self):
|
|
self._write(_BMP280_REGISTER_RESET, 0xB6)
|
|
|
|
def load_test_calibration(self):
|
|
self._T1 = 27504
|
|
self._T2 = 26435
|
|
self._T3 = -1000
|
|
self._P1 = 36477
|
|
self._P2 = -10685
|
|
self._P3 = 3024
|
|
self._P4 = 2855
|
|
self._P5 = 140
|
|
self._P6 = -7
|
|
self._P7 = 15500
|
|
self._P8 = -14600
|
|
self._P9 = 6000
|
|
|
|
def load_test_data(self):
|
|
self._t_raw = 519888
|
|
self._p_raw = 415148
|
|
|
|
def print_calibration(self):
|
|
print("T1: {} {}".format(self._T1, type(self._T1)))
|
|
print("T2: {} {}".format(self._T2, type(self._T2)))
|
|
print("T3: {} {}".format(self._T3, type(self._T3)))
|
|
print("P1: {} {}".format(self._P1, type(self._P1)))
|
|
print("P2: {} {}".format(self._P2, type(self._P2)))
|
|
print("P3: {} {}".format(self._P3, type(self._P3)))
|
|
print("P4: {} {}".format(self._P4, type(self._P4)))
|
|
print("P5: {} {}".format(self._P5, type(self._P5)))
|
|
print("P6: {} {}".format(self._P6, type(self._P6)))
|
|
print("P7: {} {}".format(self._P7, type(self._P7)))
|
|
print("P8: {} {}".format(self._P8, type(self._P8)))
|
|
print("P9: {} {}".format(self._P9, type(self._P9)))
|
|
|
|
def _calc_t_fine(self):
|
|
# From datasheet page 22
|
|
self._gauge()
|
|
if self._t_fine == 0:
|
|
var1 = (((self._t_raw >> 3) - (self._T1 << 1)) * self._T2) >> 11
|
|
var2 = (((((self._t_raw >> 4) - self._T1)
|
|
* ((self._t_raw >> 4)
|
|
- self._T1)) >> 12)
|
|
* self._T3) >> 14
|
|
self._t_fine = var1 + var2
|
|
|
|
@property
|
|
def temperature(self):
|
|
self._calc_t_fine()
|
|
if self._t == 0:
|
|
self._t = ((self._t_fine * 5 + 128) >> 8) / 100.
|
|
return self._t
|
|
|
|
@property
|
|
def pressure(self):
|
|
# From datasheet page 22
|
|
self._calc_t_fine()
|
|
if self._p == 0:
|
|
var1 = self._t_fine - 128000
|
|
var2 = var1 * var1 * self._P6
|
|
var2 = var2 + ((var1 * self._P5) << 17)
|
|
var2 = var2 + (self._P4 << 35)
|
|
var1 = ((var1 * var1 * self._P3) >> 8) + ((var1 * self._P2) << 12)
|
|
var1 = (((1 << 47) + var1) * self._P1) >> 33
|
|
|
|
if var1 == 0:
|
|
return 0
|
|
|
|
p = 1048576 - self._p_raw
|
|
p = int((((p << 31) - var2) * 3125) / var1)
|
|
var1 = (self._P9 * (p >> 13) * (p >> 13)) >> 25
|
|
var2 = (self._P8 * p) >> 19
|
|
|
|
p = ((p + var1 + var2) >> 8) + (self._P7 << 4)
|
|
self._p = p / 256.0
|
|
return self._p
|
|
|
|
def _write_bits(self, address, value, length, shift=0):
|
|
d = self._read(address)[0]
|
|
m = int('1' * length, 2) << shift
|
|
d &= ~m
|
|
d |= m & value << shift
|
|
self._write(address, d)
|
|
|
|
def _read_bits(self, address, length, shift=0):
|
|
d = self._read(address)[0]
|
|
return d >> shift & int('1' * length, 2)
|
|
|
|
@property
|
|
def standby(self):
|
|
return self._read_bits(_BMP280_REGISTER_CONFIG, 3, 5)
|
|
|
|
@standby.setter
|
|
def standby(self, v):
|
|
assert 0 <= v <= 7
|
|
self._write_bits(_BMP280_REGISTER_CONFIG, v, 3, 5)
|
|
|
|
@property
|
|
def iir(self):
|
|
return self._read_bits(_BMP280_REGISTER_CONFIG, 3, 2)
|
|
|
|
@iir.setter
|
|
def iir(self, v):
|
|
assert 0 <= v <= 4
|
|
self._write_bits(_BMP280_REGISTER_CONFIG, v, 3, 2)
|
|
|
|
@property
|
|
def spi3w(self):
|
|
return self._read_bits(_BMP280_REGISTER_CONFIG, 1)
|
|
|
|
@spi3w.setter
|
|
def spi3w(self, v):
|
|
assert v in (0, 1)
|
|
self._write_bits(_BMP280_REGISTER_CONFIG, v, 1)
|
|
|
|
@property
|
|
def temp_os(self):
|
|
return self._read_bits(_BMP280_REGISTER_CONTROL, 3, 5)
|
|
|
|
@temp_os.setter
|
|
def temp_os(self, v):
|
|
assert 0 <= v <= 5
|
|
self._write_bits(_BMP280_REGISTER_CONTROL, v, 3, 5)
|
|
|
|
@property
|
|
def press_os(self):
|
|
return self._read_bits(_BMP280_REGISTER_CONTROL, 3, 2)
|
|
|
|
@press_os.setter
|
|
def press_os(self, v):
|
|
assert 0 <= v <= 5
|
|
self._write_bits(_BMP280_REGISTER_CONTROL, v, 3, 2)
|
|
|
|
@property
|
|
def power_mode(self):
|
|
return self._read_bits(_BMP280_REGISTER_CONTROL, 2)
|
|
|
|
@power_mode.setter
|
|
def power_mode(self, v):
|
|
assert 0 <= v <= 3
|
|
self._write_bits(_BMP280_REGISTER_CONTROL, v, 2)
|
|
|
|
@property
|
|
def is_measuring(self):
|
|
return bool(self._read_bits(_BMP280_REGISTER_STATUS, 1, 3))
|
|
|
|
@property
|
|
def is_updating(self):
|
|
return bool(self._read_bits(_BMP280_REGISTER_STATUS, 1))
|
|
|
|
@property
|
|
def chip_id(self):
|
|
return self._read(_BMP280_REGISTER_ID, 2)
|
|
|
|
@property
|
|
def in_normal_mode(self):
|
|
return self.power_mode == BMP280_POWER_NORMAL
|
|
|
|
def force_measure(self):
|
|
self.power_mode = BMP280_POWER_FORCED
|
|
|
|
def normal_measure(self):
|
|
self.power_mode = BMP280_POWER_NORMAL
|
|
|
|
def sleep(self):
|
|
self.power_mode = BMP280_POWER_SLEEP
|
|
|
|
def use_case(self, uc):
|
|
assert 0 <= uc <= 5
|
|
pm, oss, iir, sb = _BMP280_CASE_MATRIX[uc]
|
|
p_os, t_os, self.read_wait_ms = _BMP280_OS_MATRIX[oss]
|
|
self._write(_BMP280_REGISTER_CONFIG, (iir << 2) + (sb << 5))
|
|
self._write(_BMP280_REGISTER_CONTROL, pm + (p_os << 2) + (t_os << 5))
|
|
|
|
def oversample(self, oss):
|
|
assert 0 <= oss <= 4
|
|
p_os, t_os, self.read_wait_ms = _BMP280_OS_MATRIX[oss]
|
|
self._write_bits(_BMP280_REGISTER_CONTROL, p_os + (t_os << 3), 2) |