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server_new.py
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server_new.py
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import serial
import struct
import os
#port name
portx="/dev/ttyUSB2"
#baud rate
bps=115200
timex=5
# 打开串口
ser=serial.Serial(portx,bps,timeout=timex)
while 1:
# request same space to storage
fileinfo_size = struct.calcsize('ss12sh16sh')
package_size=struct.calcsize('ss128sss')
# receive file_head info
fhead = ser.read(fileinfo_size)
if fhead:
#read lead_code sync_word filename filesize filetime_server package_sum
# s s 12s h 16s h
lead_code,sync_word,filename,filesize,filetime_server,package_sum= struct.unpack('ss12sh16sh', fhead)
#check lead_code and sync_word
assert(lead_code is b'\xaa')
assert(sync_word is b'\x55')
#decode filename and filetime_server
fn = filename.strip(b'\00')
fn = fn.decode()
ft = filetime_server.strip(b'\00')
ft = ft.decode()
print('file new name is {0}, filesize is {1},package_sum is {2}'.format(str(fn), filesize,package_sum))
package_No=1
#received file size
recvd_size = 0
# storage path
fp = open('./' + "new_uav.pt", 'wb')
print('start receiving...')
# written binary data stream sequencially
#unit of filesize is bit but reced_size is byte
while not recvd_size == filesize<<3:
if package_sum - package_No > 0:
package = ser.read(package_size)
lead_code,sync_word,data,package_No,package_size=struct.unpack('ss128sss',package)
recvd_size += len(data)
#double check
assert(recvd_size is (package_No*128)<<3)
assert(lead_code is b'\xaa')
assert(sync_word is b'\x55')
package_No+=1
else:
data = ser.read(filesize - recvd_size)
recvd_size = filesize
fp.write(data)
fp.close()
if not (package_sum == package_No):
print('receive failure,please try again')
else:
print('end receive...')
ser.close()
break