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312 lines
10 KiB
Python
312 lines
10 KiB
Python
##
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##############################################################################
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#
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# @file uavtalk.py
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# @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2011.
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# @brief Base classes for python UAVObject
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#
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# @see The GNU Public License (GPL) Version 3
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#
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#############################################################################/
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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import time
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import logging
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import threading
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SYNC = 0x3C
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VERSION_MASK = 0xFC
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VERSION = 0x20
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TYPE_MASK = 0x03
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TYPE_OBJ = 0x00
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TYPE_OBJ_REQ = 0x01
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TYPE_OBJ_ACK = 0x02
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TYPE_ACK = 0x03
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TYPE_NACK = 0x04
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HEADER_LENGTH = 10 # sync(1), type (1), size(2), object ID (4), instance ID(2 )
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MAX_PAYLOAD_LENGTH = 255
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CHECKSUM_LENGTH = 1
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MAX_PACKET_LENGTH = (HEADER_LENGTH + MAX_PAYLOAD_LENGTH + CHECKSUM_LENGTH)
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class Crc(object):
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crcTable = ( 0x00, 0x07, 0x0e, 0x09, 0x1c,
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0x1b, 0x12, 0x15, 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,
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0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65, 0x48, 0x4f, 0x46,
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0x41, 0x54, 0x53, 0x5a, 0x5d, 0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb,
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0xf2, 0xf5, 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd, 0x90,
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0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, 0xa8, 0xaf, 0xa6, 0xa1,
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0xb4, 0xb3, 0xba, 0xbd, 0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5,
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0xd2, 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea, 0xb7, 0xb0,
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0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, 0x8f, 0x88, 0x81, 0x86, 0x93,
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0x94, 0x9d, 0x9a, 0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,
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0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a, 0x57, 0x50, 0x59,
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0x5e, 0x4b, 0x4c, 0x45, 0x42, 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74,
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0x7d, 0x7a, 0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, 0xb1,
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0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4, 0xf9, 0xfe, 0xf7, 0xf0,
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0xe5, 0xe2, 0xeb, 0xec, 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3,
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0xd4, 0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, 0x51, 0x56,
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0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44, 0x19, 0x1e, 0x17, 0x10, 0x05,
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0x02, 0x0b, 0x0c, 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,
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0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, 0x76, 0x71, 0x78,
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0x7f, 0x6a, 0x6d, 0x64, 0x63, 0x3e, 0x39, 0x30, 0x37, 0x22, 0x25,
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0x2c, 0x2b, 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13, 0xae,
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0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, 0x96, 0x91, 0x98, 0x9f,
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0x8a, 0x8d, 0x84, 0x83, 0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc,
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0xcb, 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3 )
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def __init__(self):
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self.reset()
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def reset(self, firstValue=None):
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self.crc = 0
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if firstValue != None:
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self.add(firstValue)
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def read(self):
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return self.crc
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def add(self, value):
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try:
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self.crc = Crc.crcTable[self.crc ^ (value & 0xff)]
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except TypeError:
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print "Likely End Of File"
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raise SystemExit
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def addList(self, values):
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for v in values:
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self.add(v)
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class UavTalkRecThread(threading.Thread):
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STATE_SYNC = 0
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STATE_TYPE = 1
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STATE_SIZE = 2
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STATE_OBJID = 3
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STATE_INSTID = 4
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STATE_DATA = 5
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STATE_CS = 6
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def __init__(self, uavTalk):
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threading.Thread.__init__(self)
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self.uavTalk = uavTalk
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self.rxState = self.STATE_SYNC
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self.rxCrc = Crc()
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self.stop = False
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def run(self):
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#self.uavTalk.serial.open()
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self.stop = False
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if self.uavTalk.logFile is not None:
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file = open(self.uavTalk.logFile)
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while not self.stop:
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rx = file.read(1)
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if len(rx) > 0:
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rx = ord(rx)
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self._consumeByte(rx)
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elif self.uavTalk.serial is not None:
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while not self.stop:
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rx = self.uavTalk.serial.read(1)
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if len(rx) > 0:
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rx = ord(rx)
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# if (rx == SYNC):
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# print
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# print hex(rx),
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self._consumeByte(rx)
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else:
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print "Nothing to do!"
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def _consumeByte(self, rx):
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self.rxCrc.add(rx)
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if self.rxState == UavTalkRecThread.STATE_SYNC:
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if rx == SYNC:
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self.rxCrc.reset(rx)
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self.rxState += 1
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# else:
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# logging.warning("NoSync")
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elif self.rxState == UavTalkRecThread.STATE_TYPE:
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if (rx & VERSION_MASK != VERSION):
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self.rxState == UavTalkRecThread.STATE_SYNC
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else:
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self.rxType = rx & TYPE_MASK
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self.rxCount = 0
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self.rxSize = 0
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self.rxState += 1
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elif self.rxState == UavTalkRecThread.STATE_SIZE:
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self.rxSize >>= 8
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self.rxSize |= (rx<<8)
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self.rxCount += 1
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if self.rxCount == 2:
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# Received complete packet size, check for valid packet size
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if (self.rxSize < HEADER_LENGTH) or (self.rxSize > HEADER_LENGTH + MAX_PAYLOAD_LENGTH):
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logging.error("INVALID Packet Size")
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self.rxState = UavTalkRecThread.STATE_SYNC
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else:
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self.rxCount = 0
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self.rxObjId = 0
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self.rxState = UavTalkRecThread.STATE_OBJID
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elif self.rxState == UavTalkRecThread.STATE_OBJID:
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self.rxObjId >>= 8
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self.rxObjId |= (rx<<24)
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self.rxCount += 1
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if self.rxCount < 4:
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return
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self.rxCount = 0
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self.rxInstId = 0
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self.rxState += 1
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elif self.rxState == UavTalkRecThread.STATE_INSTID:
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self.rxCount += 1
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if self.rxCount < 2:
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return
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self.rxCount = 0
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# Received complete ObjID
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self.obj = self.uavTalk.objMan.getObj(self.rxObjId)
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if self.obj is not None:
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self.rxDataSize = self.obj.getSerialisedSize()
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if HEADER_LENGTH + self.obj.getSerialisedSize() != self.rxSize:
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logging.error("packet Size MISMATCH")
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self.rxState = UavTalkRecThread.STATE_SYNC
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else:
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# print "Object: %s" % self.obj
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self.rxCount = 0
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self.rxData = []
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if self.rxType == TYPE_OBJ_REQ | self.rxType == TYPE_ACK | self.rxType == TYPE_NACK:
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self.rxDataSize = 0
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if self.rxDataSize > 0:
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self.rxState = UavTalkRecThread.STATE_DATA
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else:
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self.rxState = UavTalkRecThread.STATE_DATA+1
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else:
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logging.warning("Rec UNKNOWN Obj %x", self.rxObjId)
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self.rxState = self.STATE_SYNC
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elif self.rxState == UavTalkRecThread.STATE_DATA:
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self.rxData.append(rx)
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self.rxCount += 1
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if self.rxCount == self.rxDataSize:
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self.rxState += 1
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#else:
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# logging.error("Obj %x INVALID SIZE", self.rxObjId)
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elif self.rxState == UavTalkRecThread.STATE_CS:
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# by now, the CS has been added to the CRC calc, so now the CRC calc should read 0
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if self.rxCrc.read() != 0:
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logging.error("CRC ERROR")
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else:
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self.uavTalk._onRecevedPacket(self.obj, self.rxType, self.rxData)
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self.rxState = UavTalkRecThread.STATE_SYNC
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else:
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logging.error("INVALID STATE")
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self.rxState = UavTalkRecThread.STATE_SYNC
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class UavTalk(object):
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def __init__(self, serial, logFile):
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self.logFile = logFile
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self.serial = serial
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self.objMan = None
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self.txLock = threading.Lock()
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def setObjMan(self, objMan):
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self.objMan = objMan
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def start(self):
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self.recThread = UavTalkRecThread(self)
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self.recThread.start()
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def stop(self):
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self.recThread.stop = True;
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self.recThread.join()
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def _onRecevedPacket(self, obj, rxType, rxData):
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logging.debug("REC Obj %20s type %x cnt %d", obj, rxType, obj.updateCnt+1)
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# for i in rxData: print hex(i),
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# print
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if rxType == TYPE_OBJ_ACK:
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logging.debug("Sending ACK for Obj %s", obj)
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self.sendObjectAck(obj)
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self.objMan.objUpdate(obj, rxData)
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def sendObjReq(self, obj):
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self._sendpacket(TYPE_OBJ_REQ, obj.objId)
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def sendObjectAck(self, obj):
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self._sendpacket(TYPE_ACK, obj.objId)
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def sendObject(self, obj, reqAck=False):
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if reqAck:
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type = TYPE_OBJ_ACK
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else:
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type = TYPE_OBJ
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self._sendpacket(type, obj.objId, obj.serialize())
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def _sendpacket(self, type, objId, data=None):
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self.txLock.acquire()
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header = [SYNC, type | VERSION, 0, 0, 0, 0, 0, 0, 0, 0]
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length = HEADER_LENGTH
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if data is not None:
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length += len(data)
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header[2] = length & 0xFF
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header[3] = (length >>8) & 0xFF
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for i in xrange(4,8):
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header[i] = objId & 0xff
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objId >>= 8
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crc = Crc()
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crc.addList(header)
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self.serial.write("".join(map(chr,header)))
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if data is not None:
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crc.addList(data)
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self.serial.write("".join(map(chr,data)))
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self.serial.write(chr(crc.read()))
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self.txLock.release()
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