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#!/usr/bin/env python
import math
import time
from ctypes import *
#cdll.LoadLibrary("./bcm2835.so")
sensor = CDLL("./sensor.so")
class mpl3115a2:
def __init__(self):
if (0 == sensor.bcm2835_init()):
print "bcm3835 driver init failed."
return
def writeRegister(self, register, value):
sensor.MPL3115A2_WRITE_REGISTER(register, value)
def readRegister(self, register):
return sensor.MPL3115A2_READ_REGISTER(register)
def active(self):
sensor.MPL3115A2_Active()
def standby(self):
sensor.MPL3115A2_Standby()
def initAlt(self):
sensor.MPL3115A2_Init_Alt()
def initBar(self):
sensor.MPL3115A2_Init_Bar()
def readAlt(self):
return sensor.MPL3115A2_Read_Alt()
def readTemp(self):
return sensor.MPL3115A2_Read_Temp()
def setOSR(self, osr):
sensor.MPL3115A2_SetOSR(osr);
def setStepTime(self, step):
sensor.MPL3115A2_SetStepTime(step)
def getTemp(self):
t = self.readTemp()
t_m = (t >> 8) & 0xff;
t_l = t & 0xff;
if (t_l > 99):
t_l = t_l / 1000.0
else:
t_l = t_l / 100.0
return (t_m + t_l)
def getAlt(self):
alt = self.readAlt()
alt_m = alt >> 8
alt_l = alt & 0xff
if (alt_l > 99):
alt_l = alt_l / 1000.0
else:
alt_l = alt_l / 100.0
return self.twosToInt(alt_m, 16) + alt_l
def getBar(self):
alt = self.readAlt()
alt_m = alt >> 6
alt_l = alt & 0x03
if (alt_l > 99):
alt_l = alt_l
else:
alt_l = alt_l
return (self.twosToInt(alt_m, 18))
def twosToInt(self, val, len):
# Convert twos compliment to integer
if(val & (1 << len - 1)):
val = val - (1<<len)
return val
mpl = mpl3115a2()
mpl.initAlt()
#mpl.initBar()
mpl.active()
time.sleep(1)
while 1:
print "MPL3115:", "\tAlt.", mpl.getAlt(), "\tTemp:", mpl.getTemp()
time.sleep(0.1)
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