kopia lustrzana https://github.com/micropython/micropython-lib
micropython/drivers/sensor/pasco2: Adding support for IFX-PASCO2 sensor.
Signed-off-by: NikhitaR-IFX <Nikhita.Rajasekhar@infineon.com>pull/644/head
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metadata(description="Driver for XENSIV PAS CO2 sensor.", version="0.1.0")
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module("pasco2.py", opt=3)
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from machine import I2C
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from utime import sleep, sleep_ms
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# Sensor Register Address Stack
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#_PASCO2_REG_PROD_ID = const(0x00) # Product and revision ID register address
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_PASCO2_REG_SENS_STS = const(0x01) # Sensor status register address
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_PASCO2_REG_MEAS_RATE_H = const(0x02) # Measurement period MSB configuration register address
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#_PASCO2_REG_MEAS_RATE_L = const(0x03) # Measurement period LSB register address
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_PASCO2_REG_MEAS_CFG = const(0x04) # Measurement mode configuration register address
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_PASCO2_REG_CO2PPM_H = const(0x05) # CO2 concentration result MSB register address
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#_PASCO2_REG_CO2PPM_L = const(0x06) # CO2 concentration result LSB register address
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_PASCO2_REG_MEAS_STS = const(0x07) # Measurement status register address
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#_PASCO2_REG_INT_CFG = const(0x08) # Interrupt pin configuration register address
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#_PASCO2_REG_ALARM_TH_H = const(0x09) # Alarm threshold MSB register address
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_PASCO2_REG_SENS_RST = const(0x10) # Soft reset register address
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#Error codes
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_PASCO2_SUCCESS = 0
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_PASCO2_ERROR = -1
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addr = 0
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mask = 1
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i2c = I2C(0)
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class PASCO2:
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"""IFX - XENSIV PAS CO2 sensor driver"""
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regMap = { # RegAddr, Mask
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'REG_SENS_STS_BITF_SENS_RDY' : [_PASCO2_REG_SENS_STS, 0x80],
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'REG_MEAS_CFG_BITF_OP_MODE' : [_PASCO2_REG_MEAS_CFG, 0x03],
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'REG_MEAS_STS_BITF_DATA_RDY' : [_PASCO2_REG_MEAS_STS, 0x10], # Data ready status bit
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'REG_CO2PPM_H_BITF_CO2_PPM_H': [_PASCO2_REG_CO2PPM_H, 0xFF],
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}
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def __init__(self, bus, measInterval=10, sensorAddr=0x28):
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self.bus = bus
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self.sensorAddr = sensorAddr
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self.measInterval = measInterval
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self.softResetCode = b"\xa3"
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def _read_reg(self, regAddr, bytesToRead=1):
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readVal = self.bus.readfrom_mem(self.sensorAddr, regAddr, bytesToRead)
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return readVal
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def _write_reg(self, regAddr, writeData):
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self.bus.writeto_mem(self.sensorAddr, regAddr, writeData)
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def _is_sensor_ready(self):
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reg = self.regMap['REG_SENS_STS_BITF_SENS_RDY']
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return (self._read_reg(reg[addr])[0] & reg[mask])
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def _soft_reset(self):
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self._write_reg(_PASCO2_REG_SENS_RST, self.softResetCode)
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def _set_mode(self, mode):
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if mode == 'idle': modeVal = 0x00
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if mode == 'continuous': modeVal = 0x02
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reg = self.regMap['REG_MEAS_CFG_BITF_OP_MODE']
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readData = self._read_reg(reg[addr])[0]
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writeData = bytes([(readData & ~(reg[mask])) | modeVal])
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self._write_reg(_PASCO2_REG_MEAS_CFG,writeData)
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def initialize(self):
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try:
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# wait for sensor to be ready
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sensor_ready = self._is_sensor_ready()
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while not sensor_ready:
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sleep(1)
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sensor_ready = self._is_sensor_ready()
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# soft reset sensor register
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self._soft_reset()
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sleep_ms(800)
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# set measure rate
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buf = bytes([(self.measInterval >> 8) & 0xFF, self.measInterval & 0xFF])
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self._write_reg(_PASCO2_REG_MEAS_RATE_H, buf)
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# reset operation mode to idle mode
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self._set_mode('idle')
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# start continuous mode
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self._set_mode('continuous')
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return _PASCO2_SUCCESS
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except:
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return _PASCO2_ERROR
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def getCO2Value(self):
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while True:
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try:
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# get meas status
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reg = self.regMap['REG_MEAS_STS_BITF_DATA_RDY']
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readStatus = self._read_reg(reg[addr])
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data_ready = readStatus[0] & reg[mask]
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if data_ready:
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# get CO2 value
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reg = self.regMap['REG_CO2PPM_H_BITF_CO2_PPM_H']
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readVal = self._read_reg(reg[addr], 2)
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co2_value = (readVal[0] << 8) | readVal[1]
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return co2_value
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except:
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return _PASCO2_ERROR
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