require "i2c"
ADRS = 0x5c          # LPS25H
NODE = "/dev/i2c-1"  # I2C device node

def to_int16( b1, b2 )
  return (b1 << 8 | b2) - ((b1 & 0x80) << 9)
end

def to_uint24( b1, b2, b3 )
  return (b1 << 16) | (b2 << 8) | b3
end

i2c = I2C.create(NODE)
res = i2c.read(ADRS, 1, 0x0f)
printf "RESULT: 0x%02x\n", res.getbyte(0)

i2c.write(ADRS, 0x20, 0x90)
sleep 1
buf = i2c.read(ADRS, 5, 0xa8) # Read 5 bytes from 0x28 register with cont mode.
p_cnt = to_uint24(buf.getbyte(2), buf.getbyte(1), buf.getbyte(0))
p p_cnt.to_f / 4096

t_cnt = to_int16(buf.getbyte(4), buf.getbyte(3))
p 42.5 + t_cnt.to_f / 480