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Content import time import ustruct from micropython import const _COMMAND_BIT = const(0x80) _WORD_BIT = const(0x20) _REGISTER_CONTROL = const(0x00) _REGISTER_TIMING = const(0x01) _REGISTER_THRESHHOLD_MIN = const(0x02) _REGISTER_THRESHHOLD_MAX = const(0x04) _REGISTER_INTERRUPT = const(0x06) _REGISTER_ID = const(0x0A) _REGISTER_CHANNEL0 = const(0x0C) _REGISTER_CHANNEL1 = const(0x0E) _CONTROL_POWERON = const(0x03) _CONTROL_POWEROFF = const(0x00) _INTERRUPT_NONE = const(0x00) _INTERRUPT_LEVEL = const(0x10) _INTEGRATION_TIME = { # time hex wait clip min max scale 13: (0x00, 15, 4900, 100, 4850, 0x7517), 101: (0x01, 120, 37000, 200, 36000, 0x0FE7), 402: (0x02, 450, 65000, 500, 63000, 1 << 10), 0: (0x03, 0, 0, 0, 0, 0), } class TSL2561: _LUX_SCALE = ( # K B M (0x0040, 0x01f2, 0x01be), (0x0080, 0x0214, 0x02d1), (0x00c0, 0x023f, 0x037b), (0x0100, 0x0270, 0x03fe), (0x0138, 0x016f, 0x01fc), (0x019a, 0x00d2, 0x00fb), (0x029a, 0x0018, 0x0012), ) def __init__(self, i2c, address=0x39): self.i2c = i2c self.address = address sensor_id = self.sensor_id() if not sensor_id & 0x10: raise RuntimeError("bad sensor id 0x{:x}".format(sensor_id)) self._active = False self._gain = 1 self._integration_time = 13 self._update_gain_and_time() def _register16(self, register, value=None): register |= _COMMAND_BIT | _WORD_BIT if value is None: data = self.i2c.readfrom_mem(self.address, register, 2) return ustruct.unpack('<H', data)[0] data = ustruct.pack('<H', value) self.i2c.writeto_mem(self.address, register, data) def _register8(self, register, value=None): register |= _COMMAND_BIT if value is None: return self.i2c.readfrom_mem(self.address, register, 1)[0] data = ustruct.pack('<B', value) self.i2c.writeto_mem(self.address, register, data) def active(self, value=None): if value is None: return self._active value = bool(value) if value != self._active: self._active = value self._register8(_REGISTER_CONTROL, _CONTROL_POWERON if value else _CONTROL_POWEROFF) def gain(self, value=None): if value is None: return self._gain if value not in (1, 16): raise ValueError("gain must be either 1x or 16x") self._gain = value self._update_gain_and_time() def integration_time(self, value=None): if value is None: return self._integration_time if value not in _INTEGRATION_TIME: raise ValueError("integration time must be 0, 13ms, 101ms or 402ms") self._integration_time = value self._update_gain_and_time() def _update_gain_and_time(self): was_active = self.active() self.active(True) self._register8(_REGISTER_TIMING, _INTEGRATION_TIME[self._integration_time][0] | {1: 0x00, 16: 0x10}[self._gain]); self.active(was_active) def sensor_id(self): return self._register8(_REGISTER_ID) def _read(self): was_active = self.active() self.active(True) if not was_active: # if the sensor was off, wait for measurement time.sleep_ms(_INTEGRATION_TIME[self._integration_time][1]) broadband = self._register16(_REGISTER_CHANNEL0) ir = self._register16(_REGISTER_CHANNEL1) self.active(was_active) return broadband, ir def _lux(self, channels): if self._integration_time == 0: raise ValueError( "can't calculate lux with manual integration time") broadband, ir = channels clip = _INTEGRATION_TIME[self._integration_time][2] if broadband > clip or ir > clip: raise ValueError("sensor saturated") scale = _INTEGRATION_TIME[self._integration_time][5] / self._gain channel0 = (broadband * scale) / 1024 channel1 = (ir * scale) / 1024 ratio = (((channel1 * 1024) / channel0 if channel0 else 0) + 1) / 2 for k, b, m in self._LUX_SCALE: if ratio <= k: break else: b = 0 m = 0 return (max(0, channel0 * b - channel1 * m) + 8192) / 16384 def read(self, autogain=False, raw=False): broadband, ir = self._read() if autogain: if self._integration_time == 0: raise ValueError( "can't do autogain with manual integration time") new_gain = self._gain if broadband < _INTEGRATION_TIME[self._integration_time][3]: new_gain = 16 elif broadband > _INTEGRATION_TIME[self._integration_time][4]: new_gain = 1 if new_gain != self._gain: self.gain(new_gain) broadband, ir = self._read() if raw: return broadband, ir return self._lux((broadband, ir)) def threshold(self, cycles=None, min_value=None, max_value=None): if min_value is None and max_value is None and cycles is None: min_value = self._register16(_REGISTER_THRESHHOLD_MIN) max_value = self._register16(_REGISTER_THRESHHOLD_MAX) cycles = self._register8(_REGISTER_INTERRUPT) if not cycles & _INTERRUPT_LEVEL: cycles = -1 else: cycles &= 0x0f return cycles, min_value, max_value was_active = self.active() self.active(True) if min_value is not None: self._register16(_REGISTER_THRESHHOLD_MIN, int(min_value)) if max_value is not None: self._register16(_REGISTER_THRESHHOLD_MAX, int(max_value)) if cycles is not None: if cycles == -1: self._register8(_REGISTER_INTERRUPT, _INTERRUPT_NONE) else: self._register8(_REGISTER_INTERRUPT, min(15, max(0, int(cycles))) | _INTERRUPT_LEVEL) self.active(was_active) def interrupt(self, value): if value or value is None: raise ValueError("can only clear the interrupt") self.i2c.writeto(self.address, b'\x40') # Those packages are identical. TSL2561T = TSL2561 TSL2561FN = TSL2561 TSL2561CL = TSL2561 class TSL2561CS(TSL2561): # This package has different lux scale. _LUX_SCALE = ( # K B M (0x0043, 0x0204, 0x01ad), (0x0085, 0x0228, 0x02c1), (0x00c8, 0x0253, 0x0363), (0x010a, 0x0282, 0x03df), (0x014d, 0x0177, 0x01dd), (0x019a, 0x0101, 0x0127), (0x029a, 0x0037, 0x002b), )