#!/usr/bin/env python
from __future__ import division
from functools import partial
import sys
import os
import serial
import time
import platform
import logging
# MODEM Protocol bytes
NUL = b'\x00'
SOH = b'\x01'
STX = b'\x02'
EOT = b'\x04'
ACK = b'\x06'
DLE = b'\x10'
NAK = b'\x15'
CAN = b'\x18'
CRC = b'C'
LOG_LEVEL_ERROR=0
LOG_LEVEL_WARN =1
LOG_LEVEL_INFO =2
LOG_LEVEL_DEBUG=3
class XMODEM(object):
'''
XMODEM Protocol handler, expects an object to read from and an object to
write to.
>>> def getc(size, timeout=1):
... return data or None
...
>>> def putc(data, timeout=1):
... return size or None
...
>>> modem = XMODEM(getc, putc)
:param getc: Function to retrieve bytes from a stream
:type getc: callable
:param putc: Function to transmit bytes to a stream
:type putc: callable
:param mode: XMODEM protocol mode
:type mode: string
:param pad: Padding character to make the packets match the packet size
:type pad: char
'''
# crctab calculated by Mark G. Mendel, Network Systems Corporation
crctable = [
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
]
def __init__(self, getc, putc, mode='xmodem', pad=b'\x1a'):
self.getc = getc
self.putc = putc
self.mode = mode
self.pad = pad
self.log_level = LOG_LEVEL_WARN
def log(self, log_level, logstr):
if log_level <= self.log_level:
print logstr
def abort(self, count=2, timeout=60):
'''
Send an abort sequence using CAN bytes.
'''
for _ in range(count):
self.putc(CAN, timeout)
def send(self, stream, retry=16, timeout=60, quiet=False, callback=None):
'''
Send a stream via the XMODEM protocol.
>>> stream = open('/etc/issue', 'rb')
>>> print(modem.send(stream))
True
Returns ``True`` upon successful transmission or ``False`` in case of
failure.
:param stream: The stream object to send data from.
:type stream: stream (file, etc.)
:param retry: The maximum number of times to try to resend a failed
packet before failing.
:type retry: int
:param timeout: The number of seconds to wait for a response before
timing out.
:type timeout: int
:param quiet: If True, write transfer information to stderr.
:type quiet: bool
:param callback: Reference to a callback function that has the
following signature. This is useful for
getting status updates while a xmodem
transfer is underway.
Expected callback signature:
def callback(total_packets, success_count, error_count)
:type callback: callable
'''
# initialize protocol
try:
packet_size = dict(
xmodem = 128,
xmodem1k = 1024,
ymodem = 1024,
)[self.mode]
except KeyError:
raise ValueError("Invalid mode specified: {self.mode!r}"
.format(self=self))
self.log(LOG_LEVEL_DEBUG, 'Begin start sequence, packet_size={0:d}'.format(packet_size))
error_count = 0
crc_mode = 0
cancel = 0
while True:
char = self.getc(1)
if char:
if char == NAK:
self.log(LOG_LEVEL_DEBUG, 'standard checksum requested (NAK).')
crc_mode = 0
break
elif char == CRC:
self.log(LOG_LEVEL_DEBUG, '16-bit CRC requested (CRC).')
crc_mode = 1
break
elif char == CAN:
if not quiet:
sys.stderr.write('received CAN\n')
if cancel:
self.log(LOG_LEVEL_INFO, 'Transmission canceled: received 2xCAN at start-sequence')
return False
else:
self.log(LOG_LEVEL_DEBUG, 'cancellation at start sequence.')
cancel = 1
else:
self.log(LOG_LEVEL_ERROR, 'send error: expected NAK, CRC, or CAN; got {0}'.format(char))
error_count += 1
if error_count > retry:
self.log(LOG_LEVEL_INFO, 'send error: error_count reached {0}, aborting.'.format(retry))
self.abort(timeout=timeout)
return False
# send data
error_count = 0
success_count = 0
total_packets = 0
image_size = 0 # the size of binary
max_cnt = 0 # the count is to be added when the frame(sequence) over 255(max block: 255k bytes)
if self.mode == 'ymodem':
sequence = 0
filenames = stream
else:
sequence = 1
while True:
# build packet
if self.mode == 'ymodem' and success_count == 0:
# send packet sequence 0 containing:
# Filename Length [Modification-Date [Mode [Serial-Number]]]
# 'stream' is actually the filename
import os
if len(filenames):
filename = filenames.pop()
stream = open(filename, 'rb')
stat = os.stat(filename)
data = os.path.basename(filename) + NUL + str(stat.st_size)
image_size = stat.st_size
self.log(LOG_LEVEL_DEBUG, 'ymodem sending : {0} len:{1}'.format(filename, stat.st_size))
else:
# empty file name packet terminates transmission
filename = ''
data = ''
stream = None
self.log(LOG_LEVEL_DEBUG, 'ymodem done, sending empty header.')
if len(data) <= 128:
header_size = 128
else:
header_size = 1024
header = self._make_send_header(header_size, sequence)
data = data.ljust(header_size, NUL)
checksum = self._make_send_checksum(crc_mode, data)
else:
# happens after sending ymodem empty filename
if not stream:
return True
# normal data packet
data = stream.read(packet_size)
if not data:
# end of stream
self.log(LOG_LEVEL_DEBUG, 'send: at EOF')
break
total_packets += 1
header = self._make_send_header(packet_size, sequence)
data = data.ljust(packet_size, self.pad)
checksum = self._make_send_checksum(crc_mode, data)
# emit packet & get ACK
while True:
if (sequence == 255): max_cnt += 1
if (image_size != 0):
send_percent = (sequence + max_cnt*255)*100.0/(image_size/1000.0)
if (round(send_percent)%5 == 0):
print('[INFO]:send image process:%d%%\n' % send_percent)
self.putc(header + data + checksum)
time.sleep(0.1) # 100ms is needed to make more robust for differnt platform
char = self.getc(1, timeout)
if char == ACK:
success_count += 1
if callable(callback):
callback(total_packets, success_count, error_count)
error_count = 0
if self.mode == 'ymodem' and success_count == 1 and len(filename):
char = self.getc(1, timeout)
if char == DLE: # dunno why
char = self.getc(1, timeout)
if char == CRC:
break
self.log(LOG_LEVEL_ERROR, 'send error: ymodem expected CRC; got {0} for block {1}'.format(char, sequence))
else:
break
if char == CRC:
curtime = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
self.log(LOG_LEVEL_ERROR, 'Got {0} for block {1} ts:{2}'.format(char, sequence, curtime))
continue
error_count += 1
if callable(callback):
callback(total_packets, success_count, error_count)
if error_count > retry:
# excessive amounts of retransmissions requested,
# abort transfer
self.log(LOG_LEVEL_ERROR, 'send error: NAK received {0} times, aborting.'.format(error_count))
self.abort(timeout=timeout)
return False
# keep track of sequence
sequence = (sequence + 1) % 0x100
# emit EOT and get corresponding ACK
while True:
print('[INFO]:send image process:100%\n')
self.log(LOG_LEVEL_DEBUG, 'sending EOT, awaiting ACK')
# end of transmission
self.putc(EOT)
# An ACK should be returned
char = self.getc(1, timeout)
if char == ACK:
break
else:
self.log(LOG_LEVEL_ERROR, 'send error: expected ACK; got {0}'.format(char))
error_count += 1
if error_count > retry:
self.log(LOG_LEVEL_WARN, 'EOT was not ACKd, aborting transfer')
self.abort(timeout=timeout)
return False
self.log(LOG_LEVEL_INFO, 'Transmission successful (ACK received).')
if self.mode == 'ymodem':
# YMODEM - recursively send next file
# or empty filename header to end the xfer batch.
stream.close()
return self.send(filenames, retry, timeout, quiet, callback)
return True
def _make_send_header(self, packet_size, sequence):
assert packet_size in (128, 1024), packet_size
_bytes = []
if packet_size == 128:
_bytes.append(ord(SOH))
elif packet_size == 1024:
_bytes.append(ord(STX))
_bytes.extend([sequence, 0xff - sequence])
return bytearray(_bytes)
def _make_send_checksum(self, crc_mode, data):
_bytes = []
if crc_mode:
crc = self.calc_crc(data)
_bytes.extend([crc >> 8, crc & 0xff])
else:
crc = self.calc_checksum(data)
_bytes.append(crc)
return bytearray(_bytes)
def recv(self, stream, crc_mode=1, retry=16, timeout=60, delay=1, quiet=0):
'''
Receive a stream via the XMODEM protocol.
>>> stream = open('/etc/issue', 'wb')
>>> print(modem.recv(stream))
2342
Returns the number of bytes received on success or ``None`` in case of
failure.
'''
# initiate protocol
error_count = 0
char = 0
cancel = 0
while True:
# first try CRC mode, if this fails,
# fall back to checksum mode
if error_count >= retry:
self.log(LOG_LEVEL_INFO, 'error_count reached {0}, aborting.'.format(retry))
self.abort(timeout=timeout)
return None
elif crc_mode and error_count < (retry // 2):
if not self.putc(CRC):
self.log(LOG_LEVEL_DEBUG, 'recv error: putc failed, sleeping for {0}'.format(delay))
time.sleep(delay)
error_count += 1
else:
crc_mode = 0
if not self.putc(NAK):
self.log(LOG_LEVEL_DEBUG, 'recv error: putc failed, sleeping for {0}'.format(delay))
time.sleep(delay)
error_count += 1
char = self.getc(1, timeout)
if char is None:
self.log(LOG_LEVEL_WARN, 'recv error: getc timeout in start sequence')
error_count += 1
continue
elif char == SOH:
self.log(LOG_LEVEL_DEBUG, 'recv: SOH')
break
elif char == STX:
self.log(LOG_LEVEL_DEBUG, 'recv: STX')
break
elif char == CAN:
if cancel:
self.log(LOG_LEVEL_INFO, 'Transmission canceled: received 2xCAN at start-sequence')
return None
else:
self.log(LOG_LEVEL_DEBUG, 'cancellation at start sequence.')
cancel = 1
else:
error_count += 1
# read data
error_count = 0
income_size = 0
packet_size = 128
sequence = 1
cancel = 0
while True:
while True:
if char == SOH:
if packet_size != 128:
self.log(LOG_LEVEL_DEBUG, 'recv: SOH, using 128b packet_size')
packet_size = 128
break
elif char == STX:
if packet_size != 1024:
self.log(LOG_LEVEL_DEBUG, 'recv: SOH, using 1k packet_size')
packet_size = 1024
break
elif char == EOT:
# We received an EOT, so send an ACK and return the
# received data length.
self.putc(ACK)
self.log(LOG_LEVEL_INFO, "Transmission complete, {0} bytes".format(income_size))
return income_size
elif char == CAN:
# cancel at two consecutive cancels
if cancel:
self.log(LOG_LEVEL_INFO, 'Transmission canceled: received 2xCAN at block {0}'.format(sequence))
return None
else:
self.log(LOG_LEVEL_DEBUG, 'cancellation at block {0}'.format(sequence))
cancel = 1
else:
err_msg = ('recv error: expected SOH, EOT; got {0}'.format(char))
if not quiet:
sys.stderr.write(err_msg+"\n")
self.log(LOG_LEVEL_WARN, err_msg)
error_count += 1
if error_count > retry:
self.log(LOG_LEVEL_INFO, 'error_count reached {0}, aborting.'.format(retry))
self.abort()
return None
# read sequence
error_count = 0
cancel = 0
self.log(LOG_LEVEL_DEBUG, 'recv: data block {0}'.format(sequence))
seq1 = self.getc(1, timeout)
if seq1 is None:
self.log(LOG_LEVEL_WARN, 'getc failed to get first sequence byte')
seq2 = None
else:
seq1 = ord(seq1)
seq2 = self.getc(1, timeout)
if seq2 is None:
self.log(LOG_LEVEL_WARN, 'getc failed to get second sequence byte')
else:
# second byte is the same as first as 1's complement
seq2 = 0xff - ord(seq2)
if not (seq1 == seq2 == sequence):
# consume data anyway ... even though we will discard it,
# it is not the sequence we expected!
err_msg = 'expected sequence {0}, got (seq1={1}, seq2={2}), \
receiving next block, will NAK.'.format(sequence, seq1, seq2)
self.log(LOG_LEVEL_ERROR, err_msg)
self.getc(packet_size + 1 + crc_mode)
else:
# sequence is ok, read packet
# packet_size + checksum
data = self.getc(packet_size + 1 + crc_mode, timeout)
valid, data = self._verify_recv_checksum(crc_mode, data)
# valid data, append chunk
if valid:
income_size += len(data)
stream.write(data)
self.putc(ACK)
sequence = (sequence + 1) % 0x100
time.sleep(0.1) #100ms is needed to be robust for differnt platform
# get next start-of-header byte
char = self.getc(1, timeout)
continue
# something went wrong, request retransmission
self.log(LOG_LEVEL_WARN, 'recv error: purge, requesting retransmission (NAK)')
while True:
# When the receiver wishes to <nak>, it should call a "PURGE"
# subroutine, to wait for the line to clear. Recall the sender
# tosses any characters in its UART buffer immediately upon
# completing sending a block, to ensure no glitches were mis-
# interpreted. The most common technique is for "PURGE" to
# call the character receive subroutine, specifying a 1-second
# timeout, and looping back to PURGE until a timeout occurs.
# The <nak> is then sent, ensuring the other end will see it.
data = self.getc(1, timeout=1)
if data is None:
break
assert False, data
self.putc(NAK)
# get next start-of-header byte
time.sleep(0.1) #100ms is needed to be robust for differnt platform
char = self.getc(1, timeout)
continue
def _verify_recv_checksum(self, crc_mode, data):
if crc_mode:
_checksum = bytearray(data[-2:])
their_sum = (_checksum[0] << 8) + _checksum[1]
data = data[:-2]
our_sum = self.calc_crc(data)
valid = bool(their_sum == our_sum)
if not valid:
self.log(LOG_LEVEL_WARN, 'recv error: checksum fail (theirs={0:04x}, ours={1:04x}), '.format(their_sum, our_sum))
else:
_checksum = bytearray([data[-1]])
their_sum = _checksum[0]
data = data[:-1]
our_sum = self.calc_checksum(data)
valid = their_sum == our_sum
if not valid:
self.log(LOG_LEVEL_WARN, 'recv error: checksum fail (theirs={0:02x}, ours={1:02x})'.forma(their_sum, our_sum))
return valid, data
def calc_checksum(self, data, checksum=0):
'''
Calculate the checksum for a given block of data, can also be used to
update a checksum.
>>> csum = modem.calc_checksum('hello')
>>> csum = modem.calc_checksum('world', csum)
>>> hex(csum)
'0x3c'
'''
if platform.python_version_tuple() >= ('3', '0', '0'):
return (sum(data) + checksum) % 256
else:
return (sum(map(ord, data)) + checksum) % 256
def calc_crc(self, data, crc=0):
'''
Calculate the Cyclic Redundancy Check for a given block of data, can
also be used to update a CRC.
>>> crc = modem.calc_crc('hello')
>>> crc = modem.calc_crc('world', crc)
>>> hex(crc)
'0xd5e3'
'''
for char in bytearray(data):
crctbl_idx = ((crc >> 8) ^ char) & 0xff
crc = ((crc << 8) ^ self.crctable[crctbl_idx]) & 0xffff
return crc & 0xffff
port = 0
prcss_debug = False
modem_debug = False
def getc(size, timeout=1):
port.timeout = timeout
ret = port.read(size)
if modem_debug:
print "read:",
print ret,
print ", {0} bytes".format(len(ret))
return ret
def putc(data, timeout=1):
port.timeout = timeout
len = port.write(data)
if modem_debug:
print "{0} bytes writen".format(len)
return len
def send_file(filename):
modem = XMODEM(getc, putc, mode="ymodem")
return modem.send([filename])
def assert_response(patterns, timeout):
port.timeout = 0.01
timeout_tick = time.time() + timeout
while True:
line = port.readline()
if prcss_debug and len(line):
print line
for pattern in patterns:
if pattern in line:
return True
if time.time() > timeout_tick:
return False
def print_usage():
print "Usage: {0} port [-a app.bin] [-b bootloader.bin] [-d driver.bin] [--bootloader-baudrate 921600] [--application-baudrate 115200] [--noboot]\n".format(sys.argv[0])
print " examples: python {0} /dev/ttyUSB0 -a app.bin, to update app only".format(sys.argv[0])
print " : python {0} /dev/ttyUSB1 -b bootloader.bin -a app.bin, to update bootloader and app".format(sys.argv[0])
print " : python {0} /dev/ttyUSB0 -a app.bin -d driver.bin, to update app and driver".format(sys.argv[0])
if len(sys.argv) < 4:
print_usage()
sys.exit(1)
device = sys.argv[1]
updates=[]
bootloader_baudrate=921600
application_baudrate=921600
bootapp = True
hardreboot = False
i = 2
update = 0
while i < len(sys.argv):
if sys.argv[i].startswith("0x") and (i + 1) < len(sys.argv):
if os.path.isfile(sys.argv[i+1]) == False:
sys.stderr.write("error: file {0} does not exist\n".format(sys.argv[i+1]))
sys.exit(1)
updates.append([sys.argv[i], sys.argv[i+1]])
update += 1
i += 1
elif sys.argv[i] == "--bootloader-baudrate" and (i + 1) < len(sys.argv):
try:
bootloader_baudrate = int(sys.argv[i+1])
except:
sys.stderr.write("error: invalid bootload baudrate value {0}\n".format(sys.argv[i+1]))
sys.exit(1)
i += 1
elif sys.argv[i] == "--application-baudrate" and (i + 1) < len(sys.argv):
try:
application_baudrate = int(sys.argv[i+1])
except:
sys.stderr.write("error: invalid bootload baudrate value {0}\n".format(sys.argv[i+1]))
sys.exit(1)
i += 1
elif sys.argv[i] == "--hardreset":
hardreboot = True
elif sys.argv[i] == "--noappboot":
bootapp = False
i += 1
if update <= 0:
sys.exit(0)
try:
port = serial.Serial(device, bootloader_baudrate, timeout = 0.05)
port.setRTS(False)
except:
sys.stderr.write("error: unable to open {0}\n".format(device))
sys.exit(1)
if hardreboot == False:
port.write("a\r\n") #abort potential ongoing YMODEM transfer
port.flushInput()
port.write("help\r\n")
if assert_response(["bootloader", "read [address] [size]"], 1) == False:
if application_baudrate != bootloader_baudrate:
port.baudrate = application_baudrate
port.flushInput()
port.write("dummycmd_for_flushing_purpose\r\n")
time.sleep(0.1)
port.write("reboot\r\n")
if assert_response(["reboot"] , 1) == False:
sys.stderr.write("error: failed to reboot the board, it did not respond to \"reboot\" command\n")
sys.exit(1)
if application_baudrate != bootloader_baudrate:
port.baudrate = bootloader_baudrate
time.sleep(0.11); port.write(" ") #0.11s
time.sleep(0.03); port.write(" ") #0.14s
time.sleep(0.03); port.write(" ") #0.17s
time.sleep(0.03); port.write(" ") #0.20s
time.sleep(0.03); port.write(" ") #0.23s
time.sleep(0.03); port.write(" \r\n") #0.26s
if assert_response(["ootloader", "BOOTLODER"], 1) == False:
sys.stderr.write("error: failed to enter bootloader\n")
sys.exit(1)
else:
port.setRTS(True)
time.sleep(0.1)
port.setRTS(False)
time.sleep(0.11); port.write(" ") #0.11s
time.sleep(0.03); port.write(" ") #0.14s
time.sleep(0.03); port.write(" ") #0.17s
time.sleep(0.03); port.write(" ") #0.20s
time.sleep(0.03); port.write(" ") #0.23s
time.sleep(0.03); port.write(" \r\n") #0.26s
if assert_response(["bootloader"], 1) == False:
sys.stderr.write("error: failed to enter bootloader\n")
sys.exit(1)
port.flushInput()
failed_num = 0
for [addr, image] in updates:
status_str = "[INFO]: updating {0} with {1} @ address {2} ...".format(device, image, addr)
print status_str
port.write("write {0}\r\n".format(addr))
time.sleep(0.5) #500ms is needed to be robust for differnt platform
if assert_response(["Waiting for the file to be sent"], 1) == False:
sys.stderr.write("error: waiting for target to enter into YMODEM recived mode failed\n")
sys.exit(1)
result = send_file(image)
if result == True:
status_str = status_str + " succeed"
else:
status_str = status_str + " failed"
failed_num += 1
print status_str
if bootapp and failed_num == 0:
port.write("boot\r\n")
assert_response(["Booting......"], 1)
port.close()
sys.exit(failed_num)