Question

我编写了以下代码来测试与路由器串行连接的各种波特率。从本质上讲，直到有希望找到写一个的位置。


import serial
from time import sleep

baud_dict = [2400, 4800, 9600, 14400, 19200, 2800, 38400, 57600, 76800, 115200, 230400]

for baud_rate in baud_dict:
    print("Trying baud rate of: " + str(baud_rate))
    ser = serial.Serial('/dev/ttyUSB0', baud_rate, timeout=1)
    print(ser)
    ser.write('\r'.encode())
    sleep(3)
    read_val = ser.read(size=64)
    ser.close()
    print(read_val)
    sleep(5)

运行此脚本时的结果是第一个波特率被测试并返回远程端的输出。测试下一个波特率时，会引发输入/输出执行。我已经梳理了pyserial文档，并且不相信我做错了什么。在进入下一个连接之前，我应该看一下不同的方法来关闭串行连接吗？

这是输出：

Trying baud rate of: 2400
Serial<id=0x7fb080c6f358, open=True>(port='/dev/ttyUSB0', baudrate=2400, bytesize=8, parity='N', stopbits=1, timeout=1, xonxoff=False, rtscts=False, dsrdtr=False)
b''
Trying baud rate of: 4800
Traceback (most recent call last):
  File "bitbang.py", line 8, in <module>
    ser = serial.Serial('/dev/ttyUSB0', baud_rate, timeout=1)
  File "/home/kris/Desktop/serial_bitbang/lib/python3.5/site-packages/serial/serialutil.py", line 240, in __init__
    self.open()
  File "/home/kris/Desktop/serial_bitbang/lib/python3.5/site-packages/serial/serialposix.py", line 286, in open
    self._update_dtr_state()
  File "/home/kris/Desktop/serial_bitbang/lib/python3.5/site-packages/serial/serialposix.py", line 634, in _update_dtr_state
    fcntl.ioctl(self.fd, TIOCMBIS, TIOCM_DTR_str)
OSError: [Errno 5] Input/output error

Answer 1

我运行您的代码成功。但你可以试试这个：

import serial
from time import sleep

baud_dict = [2400, 4800, 9600, 14400, 19200, 2800, 38400, 57600, 76800, 115200, 230400]

ser = serial.Serial('/dev/ttyS0', timeout=1)
for baud_rate in baud_dict:
    print("Trying baud rate of: " + str(baud_rate))
    ser.baudrate = baud_rate
    print(ser)
    ser.write('\r'.encode())
    sleep(3)
    read_val = ser.read(size=64)
    print(read_val)
    sleep(5)
ser.close()

pyserial：循环波特率

1 个答案: