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"""
STK500v2 protocol implementation for programming AVR chips.
The STK500v2 protocol is used by the ArduinoMega2560 and a few other Arduino platforms to load firmware.
"""
__copyright__ = "Copyright (C) 2013 David Braam - Released under terms of the AGPLv3 License"
import os, struct, sys, time
from serial import Serial
from serial import SerialException
from serial import SerialTimeoutException
import ispBase, intelHex
class Stk500v2(ispBase.IspBase):
def __init__(self):
self.serial = None
self.seq = 1
self.lastAddr = -1
self.progressCallback = None
def connect(self, port = 'COM22', speed = 115200):
if self.serial is not None:
self.close()
try:
self.serial = Serial(str(port), speed, timeout=1)
# Need to set writeTimeout separately in order to be compatible with pyserial 3.0
self.serial.writeTimeout=10000
except SerialException as e:
raise ispBase.IspError("Failed to open serial port")
except:
raise ispBase.IspError("Unexpected error while connecting to serial port:" + port + ":" + str(sys.exc_info()[0]))
self.seq = 1
#Reset the controller
for n in xrange(0, 2):
self.serial.setDTR(True)
time.sleep(0.1)
self.serial.setDTR(False)
time.sleep(0.1)
time.sleep(0.2)
self.serial.flushInput()
self.serial.flushOutput()
self.sendMessage([1])
if self.sendMessage([0x10, 0xc8, 0x64, 0x19, 0x20, 0x00, 0x53, 0x03, 0xac, 0x53, 0x00, 0x00]) != [0x10, 0x00]:
self.close()
raise ispBase.IspError("Failed to enter programming mode")
self.sendMessage([0x06, 0x80, 0x00, 0x00, 0x00])
if self.sendMessage([0xEE])[1] == 0x00:
self._has_checksum = True
else:
self._has_checksum = False
self.serial.timeout = 5
def close(self):
if self.serial is not None:
self.serial.close()
self.serial = None
#Leave ISP does not reset the serial port, only resets the device, and returns the serial port after disconnecting it from the programming interface.
# This allows you to use the serial port without opening it again.
def leaveISP(self):
if self.serial is not None:
if self.sendMessage([0x11]) != [0x11, 0x00]:
raise ispBase.IspError("Failed to leave programming mode")
ret = self.serial
self.serial = None
return ret
return None
def isConnected(self):
return self.serial is not None
def hasChecksumFunction(self):
return self._has_checksum
def sendISP(self, data):
recv = self.sendMessage([0x1D, 4, 4, 0, data[0], data[1], data[2], data[3]])
return recv[2:6]
def writeFlash(self, flashData):
#Set load addr to 0, in case we have more then 64k flash we need to enable the address extension
pageSize = self.chip['pageSize'] * 2
flashSize = pageSize * self.chip['pageCount']
if flashSize > 0xFFFF:
self.sendMessage([0x06, 0x80, 0x00, 0x00, 0x00])
else:
self.sendMessage([0x06, 0x00, 0x00, 0x00, 0x00])
loadCount = (len(flashData) + pageSize - 1) / pageSize
for i in xrange(0, loadCount):
recv = self.sendMessage([0x13, pageSize >> 8, pageSize & 0xFF, 0xc1, 0x0a, 0x40, 0x4c, 0x20, 0x00, 0x00] + flashData[(i * pageSize):(i * pageSize + pageSize)])
if self.progressCallback is not None:
if self._has_checksum:
self.progressCallback(i + 1, loadCount)
else:
self.progressCallback(i + 1, loadCount*2)
def verifyFlash(self, flashData):
if self._has_checksum:
self.sendMessage([0x06, 0x00, (len(flashData) >> 17) & 0xFF, (len(flashData) >> 9) & 0xFF, (len(flashData) >> 1) & 0xFF])
res = self.sendMessage([0xEE])
checksum_recv = res[2] | (res[3] << 8)
checksum = 0
for d in flashData:
checksum += d
checksum &= 0xFFFF
if hex(checksum) != hex(checksum_recv):
raise ispBase.IspError('Verify checksum mismatch: 0x%x != 0x%x' % (checksum & 0xFFFF, checksum_recv))
else:
#Set load addr to 0, in case we have more then 64k flash we need to enable the address extension
flashSize = self.chip['pageSize'] * 2 * self.chip['pageCount']
if flashSize > 0xFFFF:
self.sendMessage([0x06, 0x80, 0x00, 0x00, 0x00])
else:
self.sendMessage([0x06, 0x00, 0x00, 0x00, 0x00])
loadCount = (len(flashData) + 0xFF) / 0x100
for i in xrange(0, loadCount):
recv = self.sendMessage([0x14, 0x01, 0x00, 0x20])[2:0x102]
if self.progressCallback is not None:
self.progressCallback(loadCount + i + 1, loadCount*2)
for j in xrange(0, 0x100):
if i * 0x100 + j < len(flashData) and flashData[i * 0x100 + j] != recv[j]:
raise ispBase.IspError('Verify error at: 0x%x' % (i * 0x100 + j))
def sendMessage(self, data):
message = struct.pack(">BBHB", 0x1B, self.seq, len(data), 0x0E)
for c in data:
message += struct.pack(">B", c)
checksum = 0
for c in message:
checksum ^= ord(c)
message += struct.pack(">B", checksum)
try:
self.serial.write(message)
self.serial.flush()
except SerialTimeoutException:
raise ispBase.IspError('Serial send timeout')
self.seq = (self.seq + 1) & 0xFF
return self.recvMessage()
def recvMessage(self):
state = 'Start'
checksum = 0
while True:
s = self.serial.read()
if len(s) < 1:
raise ispBase.IspError("Timeout")
b = struct.unpack(">B", s)[0]
checksum ^= b
#print(hex(b))
if state == 'Start':
if b == 0x1B:
state = 'GetSeq'
checksum = 0x1B
elif state == 'GetSeq':
state = 'MsgSize1'
elif state == 'MsgSize1':
msgSize = b << 8
state = 'MsgSize2'
elif state == 'MsgSize2':
msgSize |= b
state = 'Token'
elif state == 'Token':
if b != 0x0E:
state = 'Start'
else:
state = 'Data'
data = []
elif state == 'Data':
data.append(b)
if len(data) == msgSize:
state = 'Checksum'
elif state == 'Checksum':
if checksum != 0:
state = 'Start'
else:
return data
def portList():
ret = []
import _winreg
key=_winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,"HARDWARE\\DEVICEMAP\\SERIALCOMM")
i=0
while True:
try:
values = _winreg.EnumValue(key, i)
except:
return ret
if 'USBSER' in values[0]:
ret.append(values[1])
i+=1
return ret
def runProgrammer(port, filename):
""" Run an STK500v2 program on serial port 'port' and write 'filename' into flash. """
programmer = Stk500v2()
programmer.connect(port = port)
programmer.programChip(intelHex.readHex(filename))
programmer.close()
def main():
""" Entry point to call the stk500v2 programmer from the commandline. """
import threading
if sys.argv[1] == 'AUTO':
print portList()
for port in portList():
threading.Thread(target=runProgrammer, args=(port,sys.argv[2])).start()
time.sleep(5)
else:
programmer = Stk500v2()
programmer.connect(port = sys.argv[1])
programmer.programChip(intelHex.readHex(sys.argv[2]))
sys.exit(1)
if __name__ == '__main__':
main()
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