初始化提交

boards/default_src/micropython/origin/build/lib/ltr308al.py

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+"""
+LTR-308ALS
+
+Micropython library for the LTR-308ALS  
+=======================================================
+
+#Changed from circuitpython to micropython       20220211
+
+dahanzimin From the Mixly Team 
+"""
+import time
+from micropython import const
+
+LTR_308ALS_ADDRESS	       = const(0x53)
+
+LTR_308ALS_REG_CTRL	       = const(0x00)  
+LTR_308ALS_REG_GAIN	       = const(0x05)   #设置增益
+LTR_308ALS_REG_DEVICE_ID   = const(0x06)
+LTR_308ALS_REG_DATA        = const(0x0D)
+
+#设置增益范围
+LTR_308ALS_CMD_ALS_Enable  = const(0x02) 
+LTR_308ALS_CMD_X1GAIN  =const(0x00)
+LTR_308ALS_CMD_X3GAIN  =const(0x01)
+LTR_308ALS_CMD_X6GAIN  =const(0x02)
+LTR_308ALS_CMD_X9GAIN  =const(0x03)
+LTR_308ALS_CMD_X18GAIN  =const(0x04)
+
+_GAINS = (
+    LTR_308ALS_CMD_X1GAIN,  # 1x
+    LTR_308ALS_CMD_X3GAIN,  # 3x
+    LTR_308ALS_CMD_X6GAIN,  # 6x
+    LTR_308ALS_CMD_X9GAIN,  # 9x
+    LTR_308ALS_CMD_X18GAIN  # 18x
+)
+
+_GAINS_X = (
+    1,  # 1x
+    3,  # 3x
+    6,  # 6x
+    9,  # 9x
+    18  # 18x
+)
+	
+class LTR_308ALS:
+	def __init__(self, i2c_bus,gain=1):
+		self._device = i2c_bus
+		self._address = LTR_308ALS_ADDRESS
+		self._gain = gain
+		
+		if self._chip_id() != 0xB1:
+			raise AttributeError("Cannot find a LTR_308ALS")
+		self._Enable()  #star
+		time.sleep(0.2)
+		self._wreg(LTR_308ALS_REG_GAIN,_GAINS[self._gain])	
+		
+	#Write memory address
+	def _wreg(self, reg, val):
+		self._device.writeto_mem(self._address,reg,val.to_bytes(1, 'little'))
+
+	#Read memory address
+	def _rreg(self, reg,nbytes=1):
+		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 _chip_id(self):  
+		return self._rreg(LTR_308ALS_REG_DEVICE_ID)
+		
+	def _Enable(self): 
+		self._wreg(LTR_308ALS_REG_CTRL,LTR_308ALS_CMD_ALS_Enable)
+		
+	def getdata(self): 
+		buffer=self._rreg(LTR_308ALS_REG_DATA,3)
+		als_data= buffer[2]<<16 | buffer[1]<<8| buffer[0]
+		als_lux=float(0.6*als_data/_GAINS_X[self._gain])
+		return als_lux
+