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i2c support

This commit is contained in:
Paolo Asperti 2018-02-19 20:42:44 +01:00
parent 4da032952a
commit ca716802d8
1 changed files with 21 additions and 6 deletions
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@ -7,6 +7,7 @@ from argh import arg
from subprocess import call from subprocess import call
import re import re
import glob import glob
import time
import ConfigParser import ConfigParser
import json as JSON import json as JSON
@ -97,6 +98,10 @@ def getpower(outlet, json=False):
# MCP23008 # MCP23008
class BoardI2COut(object): class BoardI2COut(object):
data = 0
next_refresh = 0
lifetime_sec = 2
def __init__(self, boardnum, channels=None, address=None, bus=None): def __init__(self, boardnum, channels=None, address=None, bus=None):
self.boardnum = boardnum self.boardnum = boardnum
if channels is None: if channels is None:
@ -121,16 +126,26 @@ class BoardI2COut(object):
return ' Board %s\n Type: i2c-out\n Channels: %s\n Address: %s\n\n' % (self.boardnum,self.channels,self.address) return ' Board %s\n Type: i2c-out\n Channels: %s\n Address: %s\n\n' % (self.boardnum,self.channels,self.address)
def setpower(self, channel, power): def setpower(self, channel, power):
d = self.getpower(channel) old_data = data = self.getdata()
mask = 1 << channel mask = 1 << channel
d &= ~mask data &= ~mask
if power: if power:
d |= mask data |= mask
#i2cset -y 1 0x20 0x09 0xFF if old_data != data:
return os.popen("/usr/sbin/i2cset -y %s %s 0x09 0x%s" % (self.bus, self.address, format(d, '02x'))).read() self.next_refresh = 0
return os.popen("/usr/sbin/i2cset -y %s %s 0x09 0x%s" % (self.bus, self.address, format(data, '02x'))).read()
def getpower(self, channel): def getpower(self, channel):
return os.popen("/usr/sbin/i2cget -y %s %s 0x09" % (self.bus, self.address)).read() data = self.getdata()
d = ( data >> channel ) & 1
return d == 1
def getdata(self):
now = time.time()
if now > self.next_refresh:
self.data = int(os.popen("/usr/sbin/i2cget -y %s %s 0x0A" % (self.bus, self.address)).read(),0)
self.next_refresh = now + self.lifetime_sec
return self.data
def init(self): def init(self):
call(["/usr/sbin/i2cset", "-y", self.bus, self.address, "0x00", "0x00"]) call(["/usr/sbin/i2cset", "-y", self.bus, self.address, "0x00", "0x00"])