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# -*- coding: utf-8 -*-
import asynchat
import asyncore
import socket
import sys
import os
from lxml import objectify
from lxml import etree
"""ebus specific data field formats"""
class fields:
class DataField(object):
def __init__(self, name, offset):
self.name = name
self.offset = offset
def value(self,data):
raise NotImplemented()
class Data1b(DataField):
"""
Beispiel für die Berechnung:
if ((x & 80h) == 80h) // y negativ
y = - [dez(!x) + 1]
else
y = dez(x)
"""
def value(self,data):
x=ord(data[self.offset])
if x & 0x80 == 0x80:
return (-1) * (0xff^x + 1)
else:
return x
class Data1c(DataField):
def value(self,data):
return ord(data[self.offset])/2.0
class Data2c(DataField):
"""
Beispiel für die Berechnung:
if ((x & 8000h) == 8000h) // y negativ
y = - [dez(High_Byte(!x)) 16 + dez(High_Nibble (Low_Byte (!x)))
+ (dez(Low_Nibble (Low_Byte (!x))) +1 ) / 16]
else // y positiv
y = dez(High_Byte(x)) 16 + dez(High_ Nibble (Low Byte (x)))
+ dez(Low_ Nibble (Low Byte (x))) / 16
"""
def value(self,data):
highByte = ord(data[self.offset+1])
lowByte= ord(data[self.offset])
if (0x8000 & (highByte<<8 | lowByte)) == 0x8000:
return (-1) * ( (0xff^highByte)*16 + (0xff^(lowByte>>4)) + (0x0ff^(0xf&lowByte) + 1)/16.0 )
else:
return highByte*16 + (lowByte>>4) + (lowByte&0xf)/16.0
class Data2b(DataField):
"""
if ((x&8000h) == 8000h) // y negativ
y = - [dez(High_Byte(!x)) + (dez(Low_Byte(!x)) + 1) / 256]
else // y positiv
y = dez(High_Byte (x)) + dez(Low_Byte (x)) / 256
"""
def value(self,data):
highByte = ord(data[self.offset+1])
lowByte= ord(data[self.offset])
if (0x8000 & (highByte<<8 | lowByte)) == 0x8000:
return (-1) * ((0xff^highByte) + (0xff^lowByte+1)/256.0)
else:
return highByte + lowByte/256.0
class Bit(DataField):
def value(self, data):
return ord(data[self.offset]) == 0x1
class Word(DataField):
def value(self, data):
lb, hb = data[self.offset], data[self.offset+1]
return ord(lb) + (ord(hb)<<8)
class Bcd(DataField):
"""
y = dez(High_Nibble(x))*10 + dez(Low_Nibble(x))
"""
def value(self, data):
byte = ord(data[self.offset])
return (byte >> 4) * 10 + (byte & 0xf)
class Byte(DataField):
def value(self, data):
return ord(data[self.offset])
class ByteEnum(DataField):
def __init__(self, name, offset, values):
fields.DataField.__init__(self, name, offset)
self.values = values
def value(self, data):
value = ord(data[self.offset])
if self.values.has_key(value):
return self.values[value]
else:
return None
class EbusXMLMixin(object):
EBUS_SPECIFICATION = os.path.join(os.path.dirname(__file__), "ebus_specification.xml")
ebus_xml = objectify.parse(open(EBUS_SPECIFICATION))
@staticmethod
def address_to_type(address):
d=[dev.get("type") for dev in EbusXMLMixin.ebus_xml.xpath("/ebus/devices/device[@address=$address]",
address="0x%.2x"%address)]
return len(d)>0 and d[0] or None
def _get_packet(self):
p=EbusXMLMixin.ebus_xml.xpath("/ebus/packets/packet[@primary=$primary and @secondary=$secondary]",
primary="0x%.2x"%self.primary_command,
secondary="0x%.2x"%self.secondary_command)
return len(p)>0 and p[0] or None
def _get_source(self):
s=EbusXMLMixin.ebus_xml.xpath("/ebus/devices/device[@address=$address]",
address="0x%.2x"%self.source)
return len(s)>0 and s[0] or None
def _get_destination(self):
d=EbusXMLMixin.ebus_xml.xpath("/ebus/devices/device[@address=$address]",
address="0x%.2x"%self.destination)
return len(d)>0 and d[0] or None
def name(self):
return self._get_packet().get("name")
def description(self):
return self._get_packet().get("description")
def format(self):
packet = self._get_packet()
if packet is not None:
for field in packet.fields.iterchildren():
name = field.get("name")
offset = field.get("offset")
if not name:
continue
elif field.tag == "bit":
yield fields.Bit( name, int(offset) )
elif field.tag == "byte":
yield fields.Byte( name, int(offset) )
elif field.tag == "word":
yield fields.Word( name, int(offset) )
elif field.tag == "data1b":
yield fields.Data1b( name, int(offset) )
elif field.tag == "data1c":
yield fields.Data1c( name, int(offset) )
elif field.tag == "data2b":
yield fields.Data2b( name, int(offset) )
elif field.tag == "data2c":
yield fields.Data2c( name, int(offset) )
elif field.tag == "bcd":
yield fields.Bcd( name, int(offset) )
elif field.tag == "byteEnum":
options = dict(map(lambda opt: ( int(opt.get("value"),16), opt.get("name")),
field.xpath("./option")))
yield fields.ByteEnum( name, int(offset), options)
else:
print "error: %s in %s" % (name, self.name())
def formatHex(data):
return " ".join(map(lambda byte: "%.2x"%ord(byte), data))
class EbusPacket(EbusXMLMixin):
def __init__(self, source, destination, primary_command, secondary_command):
self.source = source
self.destination = destination
self.primary_command = primary_command
self.secondary_command = secondary_command
def __str__(self):
#XXX self.length only in subclasses
return "<%-18s name=\"%s\" source=\"0x%.2x\" destination=\"0x%.2x\" primary=0x%x secondary=0x%x length=0x%x %s>" % \
(self.__class__.__name__, self.name(), self.source, self.destination, \
self.primary_command, self.secondary_command, self.length, \
" ".join(map(lambda name: "%s=%s" % (name, self.values()[name]),self.values())))
def values(self):
return dict( map(lambda format: (format.name, format.value(self.data) ),
self.format() ))
class EbusMasterMaster(EbusPacket):
def __init__(self, source, destination, primary_command, secondary_command, data):
EbusPacket.__init__(self, source, destination, primary_command, secondary_command)
self.length = len(data)
self.data = data
class EbusMasterSlave(EbusPacket):
def __init__(self, source, destination, primary_command, secondary_command, request, response):
EbusPacket.__init__(self, source, destination, primary_command, secondary_command)
self.length = len(request)
self.request = request
self.response = response
self.data = self.request #XXX
class EbusBroadcast(EbusPacket):
def __init__(self, source, destination, primary_command, secondary_command, data):
EbusPacket.__init__(self, source, destination, primary_command, secondary_command)
self.length = len(data)
self.data = data
class EbusReader(asynchat.async_chat):
def __init__(self):
asynchat.async_chat.__init__(self)
self.set_terminator("")
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.connect(("10.2.2.200", 7970))
self.packetIndex = 0
self.buf = ""
self.debug = False
def collect_incoming_data(self,data):
for it in range(len(data)):
if data[it] == "\xaa":
if it+1 < len(data) and data[it+1] != "\xaa":
self._parse(self.buf)
self.buf = ""
self.packetIndex = 0
else:
self.buf += data[it]
self.packetIndex = self.packetIndex + 1
#print "%.2x [%d]" % (ord(data[it]),self.packetIndex)
def _parse(self,dataRaw):
#0xaa bug
i = 0
data = ""
while (i+1) < len(dataRaw):
if ord(dataRaw[i]) == 0xaa and ord(dataRaw[i+1]) == 0x01:
data += "\xaa"
i = i + 1
elif ord(dataRaw[i]) == 0xa9 and ord(dataRaw[i+1]) == 0x00:
data += "\xa9"
i = i + 1
else:
data += dataRaw[i]
i = i + 1
if len(data) < 2:
print "GAGA"
return
source = ord(data[0])
sourceType = EbusXMLMixin.address_to_type(source)
destination = ord(data[1])
destinationType = EbusXMLMixin.address_to_type(destination)
if len(data) < 9:
print >>sys.stderr, "Unvollständige Daten"
return
primaryCommand = ord(data[2])
secondaryCommand = ord(data[3])
payloadLength = ord(data[4])
payload = data[5:5+payloadLength]
if self.debug:
print "\033[1;31m%.2x %.2x\033[1;m \033[1;33m%.2x %.2x\033[1;m \033[1;30m%.2x\033[1;m \033[1;45m%s\033[1;m" % (source,destination,primaryCommand,secondaryCommand,payloadLength,formatHex(payload))
p = None
if sourceType == 'master' and destinationType == 'master':
p = EbusMasterMaster(source, destination, primaryCommand, secondaryCommand, payload)
self.handle_ebus(p)
elif sourceType == 'master' and destinationType == 'slave':
p = EbusMasterSlave(source, destination, primaryCommand, secondaryCommand, payload, None) #FIXME
print >>sys.stderr, "SKIP MASTER-SLAVE"
elif sourceType == 'master' and destinationType == 'broadcast':
p = EbusBroadcast(source, destination, primaryCommand, secondaryCommand, payload)
self.handle_ebus(p)
else:
print >>sys.stderr, "KOMISCHES ZEUG"
print >>sys.stderr, "source=%s sourceType=%s destination=%s destType=%s" % \
(source, sourceType, destination, destinationType)
def handle_ebus(self,ebus_packet):
print >>sys.stderr, "unhandled ebus_packet"
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