ce65ae86b4
It is cleaner to store the needed wait-time with the struct than to passit to the read-write function. This change mostly acopmplieshs that
53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
import smbus2
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from smbus2 import SMBusWrapper, SMBus, i2c_msg
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from collections import namedtuple
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from functools import partial
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#import Adafruit_PureIO.smbus as adabus
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from time import sleep, asctime,time
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import json
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from copy import copy
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import requests
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import os.path
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DEVICE_BUS = 1
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DEVICE_ADDR = 0x58
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#print bus.write_byte_datadata(DEVICE_ADDR, 0x00, 0x01)
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#self._i2c_read_words_from_cmd([0x36, 0x82], 0.01, 3)
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Sgp30Cmd = namedtuple("Sgp30Cmd",["commands","replylen","waittime"])
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GET_SERIAL=Sgp30Cmd([0x36, 0x82],6,10)
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GET_FEATURES=Sgp30Cmd([0x20, 0x15],2,2)
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IAQ_INIT=Sgp30Cmd([0x20, 0x03],0,10)
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IAQ_MEASURE=Sgp30Cmd([0x20, 0x08],6,12)
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IAQ_SELFTEST=Sgp30Cmd([0x20, 0x32],3,520)
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GET_BASELINE=Sgp30Cmd([0x20, 0x15],6,120)
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SET_BASELINE=Sgp30Cmd([0x20, 0x1e],0,10)
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Sgp30Answer = namedtuple("Sgp30Answer",["data","raw"])
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def read_write(cmd,bus,addr=DEVICE_ADDR):
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write = i2c_msg.write(addr,cmd.commands)
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if cmd.replylen <= 0 :
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bus.i2c_rdwr(write)
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else:
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read = i2c_msg.read(addr,cmd.replylen)
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bus.i2c_rdwr(write)
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sleep(waittime/1000.0)
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bus.i2c_rdwr(read)
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r = list(read)
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answer = [i<<8 | j for i,j in zip(r[0::3],r[1::3])]
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return answer
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with SMBusWrapper(1) as bus:
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rw=partial(read_write,bus=bus)
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print(rw(GET_FEATURES))
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print(rw(GET_SERIAL))
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print(rw(IAQ_INIT))
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#print(rw(IAQ_SELFTEST,sleep_time=.1))
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for i in range(600):
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print( "CO_2eq: %d ppm, TVOC: %d"%tuple( rw(IAQ_MEASURE,sleep_time=.1)))
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sleep(2)
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bus.close()
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