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adds crc-check to read_write method

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This commit is contained in:
Simon Albinsson
2018-04-12 21:41:58 +00:00
parent 17e8468f58
commit b42c4f33e1
1 changed files with 9 additions and 3 deletions
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12
sgp30/sgp30.py
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@@ -7,6 +7,7 @@ import json
from copy import copy
import requests
import os.path
from .crc import Crc8
DEVICE_BUS = 1
BASELINE_FILENAME = os.path.expanduser("~/sgp_config_data.txt")
@@ -37,7 +38,7 @@ class Sgp30():
self._start_time = time()
self._baseline_filename=baseline_filename
Sgp30Answer = namedtuple("Sgp30Answer",["data","raw"])
Sgp30Answer = namedtuple("Sgp30Answer",["data","raw","crc_ok"])
def read_write(self,cmd):
write = i2c_msg.write(self._device_addr,cmd.commands)
@@ -50,8 +51,10 @@ class Sgp30():
self._bus.i2c_rdwr(read)
self._bus.i2c_rdwr(read)
r = list(read)
answer = [i<<8 | j for i,j in zip(r[0::3],r[1::3])]
return self.Sgp30Answer(answer,r)
a = zip(r[0::3],r[1::3])
crc_ok = r[2::3] == [Crc8().hash(i) for i in a ]
answer = [i<<8 | j for i,j in a]
return self.Sgp30Answer(answer,r,crc_ok)
def try_set_baseline(self):
try:
@@ -69,6 +72,9 @@ class Sgp30():
def read_measurements(self):
return self.rw(_cmds.IAQ_MEASURE)
def read_selftest(self):
return self.rw(_cmds.IAQ_SELFTEST)
def init_sgp(self):
print("Initializing SGP30")
self.rw(_cmds.IAQ_INIT)