kopia lustrzana https://github.com/micropython/micropython
110 wiersze
3.5 KiB
Python
110 wiersze
3.5 KiB
Python
"""
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The MIT License (MIT)
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Copyright (c) 2016-2019 shaoziyang <shaoziyang@micropython.org.cn>
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Copyright (c) 2022 Ibrahim Abdelkader <iabdalkader@openmv.io>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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LPS22HB/HH pressure sensor driver for MicroPython.
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Example usage:
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import time
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from lps22h import LPS22H
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from machine import Pin, I2C
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bus = I2C(1, scl=Pin(15), sda=Pin(14))
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lps = LPS22H(bus, oneshot=False)
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while (True):
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print("Pressure: %.2f hPa Temperature: %.2f C"%(lps.pressure(), lps.temperature()))
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time.sleep_ms(10)
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"""
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import machine
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_LPS22_CTRL_REG1 = const(0x10)
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_LPS22_CTRL_REG2 = const(0x11)
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_LPS22_STATUS = const(0x27)
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_LPS22_TEMP_OUT_L = const(0x2B)
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_LPS22_PRESS_OUT_XL = const(0x28)
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_LPS22_PRESS_OUT_L = const(0x29)
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class LPS22H:
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def __init__(self, i2c, address=0x5C, oneshot=False):
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self.i2c = i2c
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self.addr = address
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self.oneshot = oneshot
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self.buf = bytearray(1)
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# ODR=1 EN_LPFP=1 BDU=1
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self._write_reg(_LPS22_CTRL_REG1, 0x1A)
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self.set_oneshot_mode(self.oneshot)
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def _int16(self, d):
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return d if d < 0x8000 else d - 0x10000
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def _write_reg(self, reg, dat):
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self.buf[0] = dat
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self.i2c.writeto_mem(self.addr, reg, self.buf)
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def _read_reg(self, reg, width=8):
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self.i2c.readfrom_mem_into(self.addr, reg, self.buf)
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val = self.buf[0]
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if width == 16:
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val |= self._read_reg(reg + 1) << 8
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return val
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def _tigger_oneshot(self, b):
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if self.oneshot:
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self._write_reg(_LPS22_CTRL_REG2, self._read_reg(_LPS22_CTRL_REG2) | 0x01)
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self._read_reg(0x28 + b * 2)
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while True:
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if self._read_reg(_LPS22_STATUS) & b:
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return
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machine.idle()
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def set_oneshot_mode(self, oneshot):
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self._read_reg(_LPS22_CTRL_REG1)
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self.oneshot = oneshot
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if oneshot:
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self.buf[0] &= 0x0F
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else:
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self.buf[0] |= 0x10
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self._write_reg(_LPS22_CTRL_REG1, self.buf[0])
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def pressure(self):
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if self.oneshot:
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self._tigger_oneshot(1)
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return (
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self._read_reg(_LPS22_PRESS_OUT_XL) + self._read_reg(_LPS22_PRESS_OUT_L, 16) * 256
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) / 4096
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def temperature(self):
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if self.oneshot:
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self._tigger_oneshot(2)
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return self._int16(self._read_reg(_LPS22_TEMP_OUT_L, 16)) / 100
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def altitude(self):
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return (
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(((1013.25 / self.pressure()) ** (1 / 5.257)) - 1.0)
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* (self.temperature() + 273.15)
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/ 0.0065
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)
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