microbit-libraries/si1145.py at master · vittascience/microbit-libraries · GitHub

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from microbit import i2c,sleep
class SI1145:
  def __init__(self):
    self._reset()
    self._load_calibration()
  def _reset(self):
    i2c.write(0x60,b'\x08\x00')
    i2c.write(0x60,b'\x09\x00')
    i2c.write(0x60,b'\x04\x00')
    i2c.write(0x60,b'\x05\x00')
    i2c.write(0x60,b'\x06\x00')
    i2c.write(0x60,b'\x03\x00')
    i2c.write(0x60,b'\x21\xFF')
    i2c.write(0x60,b'\x18\x01')
    sleep(10)
    i2c.write(0x60,b'\x07\x17')
    sleep(10)
  def writeParam(self,p,v):
    i2c.write(0x60,bytearray([0x17,v]))
    i2c.write(0x60,bytearray([0x18,p|0xA0]))
    return i2c.read(0x60, 0x2E)
  def _load_calibration(self):
    i2c.write(0x60,b'\x13\x29')
    i2c.write(0x60,b'\x14\x89')
    i2c.write(0x60,b'\x15\x02')
    i2c.write(0x60,b'\x16\x00')
    self.writeParam(0x01,0x80|0x20|0X10|0x01)
    i2c.write(0x60,b'\x03\x01')
    i2c.write(0x60,b'\x04\x01')
    i2c.write(0x60,b'\x0F\x03')
    self.writeParam(0x07,0x03)
    self.writeParam(0x02,0X01)
    self.writeParam(0x0B,0)
    self.writeParam(0x0A,0x70)
    self.writeParam(0x0C,0x20|0x04)
    self.writeParam(0x0E,0x00)
    self.writeParam(0x1E,0)
    self.writeParam(0x1D,0x70)
    self.writeParam(0x1F,0x20)
    self.writeParam(0x11,0)
    self.writeParam(0x10,0x70)
    self.writeParam(0x12,0x20)
    i2c.write(0x60,b'\x08\xFF')
    i2c.write(0x60,b'\x18\x0F')
  def read16(self,reg,l=True):
    i2c.write(0x60,bytearray([reg]))
    d=i2c.read(0x60,2)
    if l:d=((d[1]<<8)|(d[0]&0xFF))
    else:d=((d[0]<<8)|(d[1]&0xFF))
    return d
  def readUV(self):return self.read16(0x2C)
  def readVisible(self):return self.read16(0x22)
  def readIR(self):return self.read16(0x24)
  def readProx(self):return self.read16(0x26)