python读取uart串口_用python通过UART接收数据

我试图通过UART发送和接收Python数据。发送正常，但读数仍然错误。谁能帮忙吗？在import time, os, re, urllib

import msvcrt

import sys

import serial

import struct

port="COM38"

def getAndSend1(test,type):

global port

if type=='int' :

value=int(test) ##casting string to int

ba=bytearray(struct.pack("i",value))

elif type=='float' :

value=float(test) ##casting string to float

ba=bytearray(struct.pack("f",value))

else:

print("undefined type")

return 0

ba= b'\x7E\x7E'+ba+b'\x01\x01' ##adding header and tail to the byte array

print("sent: "+str([ "0x%02x" % b for b in ba])) ##print the packet before sending it

ser = serial.Serial(port, 115200) ##open serial port

while ser.isOpen()==0: ##waiting till port get open

1==1

time.sleep(2)

ser.write(ba) ##sending the packet

result = ser.read(8) ##reading the serial port

print("recieved: "+str([ "0x%02x" % r for r in result]))

resVal=struct.unpack("f",result[2:6]);

print(str(resVal[0])+"\n")

getAndSend1(1,'int')

当我运行它时，我得到了以下错误：

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