def check_data(data):
if len(data)!=BUS_DATA_LEN:
print('error data len')
return 0
if data[0]!=BUS_DATA_HEAD:
print('error data head')
return 0
if data[-1]!=BUS_DATA_END:
print('error data end')
return 0
if data[-2]!=crc_check(data[1:BUS_DATA_LEN-2]):
print('error data checksum')
return 0
#公交车id判断
#id=str(data[1:5],'gbk')
#公交车线路判断
#line=str(data[5:9],'gbk').strip()
stream=str(data[9:13], 'gbk')
if stream !='上行' and stream!='下行':
print('line stream error, should be 上行 or 下行')
return 0
#公交车经纬度判断
lng=float(str(data[13:21], 'gbk'))/600000
if lng < 110 or lng > 120:
print('lng %f error,out bound [110,120]'%lng)
return 0
lat=float(str(data[21:29], 'gbk'))/600000
if lat < 30 or lat >40:
print('lat %f error,out bound [30,40]'%lat)
return 0
return 1
def pack_clear_all():
data=bytearray(5)
data[0]=CODE_FRAME_HEAD
data[1]=CODE_CLEAR
data[2]=LEN_OF_CODE_CLEAR
data[-2]=crc_check(data[:-2])
data[-1]=CODE_FRAME_END
return data
def pack_clear_line_txt(r_num):
data=bytearray(6)
data[0]=CODE_FRAME_HEAD
data[1]=CODE_CLEAR_TEXT
data[2]=LEN_OF_CODE_CLEAR_TEXT
data[3]=r_num
data[-2]=crc_check(data[:-2])
data[-1]=CODE_FRAME_END
return data
def pack_set_total_road(num):
data=bytearray(6)
data[0]=CODE_FRAME_HEAD
data[1]=CODE_LINE
data[2]=LEN_OF_CODE_LINE
data[3]=num
data[4]=crc_check(data[:-2])
data[5]=CODE_FRAME_END
return data
def pack_set_speed(type, speed, stop):
data=bytearray(8)
data[0]=CODE_FRAME_HEAD
data[1]=CODE_SPEED
data[2]=LEN_OF_CODE_SPEED
data[3]=type
data[4]=speed
data[5]=stop
data[-2]=crc_check(data[:-2])
data[-1]=CODE_FRAME_END
return data
def pack_set_line_txt(r_num, name, msg1, msg2):
m1len=len(bytes(msg1, 'gbk'))
m2len=len(bytes(msg2, 'gbk'))
nlen=len(bytes(name, 'gbk'))
tlen=m1len+m2len+4+4
#len of name should less than 4
if nlen < 4:
name=name.rjust(4)
if nlen > 4:
name=name[0:4]
data=bytearray(m1len+m2len+9+4)
data[0]=CODE_FRAME_HEAD
data[1]=CODE_TEXT
data[2]=tlen
data[3]=r_num
data[4:8]=bytes(name, 'gbk')
data[8]=m1len
data[9:9+m1len]=bytes(msg1, 'gbk')
data[9+m1len]=m2len
data[10+m1len:-3]=bytes(msg2, 'gbk')
data[-3]=0x1
data[-2]=crc_check(data[:-2])
data[-1]=CODE_FRAME_END
return data
