初始化提交

boards/default_src/micropython/origin/build/lib/ltr390uv.py

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+"""
+LTR-390UV
+
+Micropython library for the LTR-390UV(ALS+UV)
+=======================================================
+
+#Preliminary composition       			20240120
+
+@dahanzimin From the Mixly Team 
+"""
+import time
+from micropython import const
+
+_LTR390_ADDRESS		= const(0x53)
+_LTR390_REG_CTRL	= const(0x00)
+_LTR390_REG_MEAS	= const(0x04) 
+_LTR390_REG_GAIN	= const(0x05)
+_LTR390_REG_ID		= const(0x06)
+_LTR390_REG_ALS		= const(0x0D)
+_LTR390_REG_UVS		= const(0x10)
+
+_RATE_DEFAULT		= const(0x02)	#100ms
+_RESOLUTION_20BIT	= (0<<4, 4)
+_RESOLUTION_19BIT	= (1<<4, 2)
+_RESOLUTION_18BIT 	= (2<<4, 1)
+_RESOLUTION_17BIT	= (3<<4, 0.5)
+_RESOLUTION_16BIT	= (4<<4, 0.25)
+_RESOLUTION_13BIT	= (5<<4, 0.125)
+
+_GAIN_X1	= (0, 1)
+_GAIN_X3	= (1, 3)
+_GAIN_X6	= (2, 6)
+_GAIN_X9	= (3, 9)
+_GAIN_X18	= (4, 18)
+
+class ALS_UVS:
+	def __init__(self, i2c_bus, addr=_LTR390_ADDRESS, gain=_GAIN_X1, resolution=_RESOLUTION_17BIT):
+		self._device = i2c_bus
+		self._address = addr
+		self._gain = gain
+		self._reso = resolution
+		self._flaga = False
+		self._flagu = False
+
+		if self._rreg(_LTR390_REG_ID) != 0xB2:
+			raise AttributeError("Cannot find a LTR-390UV")
+
+		self._wreg(_LTR390_REG_MEAS, self._reso[0] | _RATE_DEFAULT)				
+		self._wreg(_LTR390_REG_GAIN, self._gain[0])	
+		
+	def _wreg(self, reg, val):
+		'''Write memory address'''
+		self._device.writeto_mem(self._address,reg,val.to_bytes(1, 'little'))
+
+	def _rreg(self, reg, nbytes=1):
+		'''Read memory address'''
+		return  self._device.readfrom_mem(self._address, reg, nbytes)[0] if nbytes<=1 else self._device.readfrom_mem(self._address, reg, nbytes)[0:nbytes]
+
+	def ultraviolet(self): 
+		if not self._flagu:
+			self._wreg(_LTR390_REG_CTRL, 0x0A)		#UVS in Active Mode	
+			time.sleep_ms(int(self._reso[1] * 100))
+			self._flagu = True
+		self._flaga = False
+		buf = self._rreg(_LTR390_REG_UVS, 3)
+		return buf[2] << 16 | buf[1] << 8 | buf[0]
+
+	def ambient_light(self):
+		if not self._flaga: 
+			self._wreg(_LTR390_REG_CTRL, 0x02)		#ALS in Active Mode	
+			time.sleep_ms(int(self._reso[1] * 100))
+			self._flaga = True
+		self._flagu = False	
+		buf = self._rreg(_LTR390_REG_ALS, 3)
+		return 0.6 * (buf[2] << 16 | buf[1] << 8 | buf[0]) / (self._gain[1] * self._reso[1])