"AT+CGPSINFO“命令适用于Socat，但不适用于PySerial
"AT+CGPSINFO“命令适用于Socat，但不适用于PySerial
提问于 2020-11-04 02:19:22
以下Socat命令根据需要返回GPS数据：
echo 'AT+CGPSINFO' | socat - /dev/ttyUSB3,crnl
+CGPSINFO: 5100.505778,N,11404.437214,W,031120,175538.0,1076.7,0.0,348.0
OK现在我想用PySerial在Python语言中做同样的事情，但是我得到了一个错误。
from serial import Serial
import time
def sleep_for_x_seconds(sleep_secs=0.25):
print(f"Sleeping for {sleep_secs} seconds...")
time.sleep(sleep_secs)
def write_to_modem(modem, to_write, sleep=True, sleep_secs=0.25, readlines=True):
print(f"Writing {to_write}...")
modem.write(to_write)
if sleep:
sleep_for_x_seconds(sleep_secs)
if readlines:
print(modem.readlines())
sleep_secs = 0.25
port = "/dev/ttyUSB3"
print(f"Initializing modem on port '{port}'...")
modem = Serial()
modem.port = port
modem.timeout = 1 # How long to wait when reading lines
modem.writeTimeout = 1
sleep_for_x_seconds(sleep_secs)
print("Opening modem and flushing input and output...")
modem.open()
modem.flushInput()
modem.flushOutput()
sleep_for_x_seconds(sleep_secs)
# This first command returns [b'\r\n', b'OK\r\n']
write_to_modem(modem, b"AT\r\n", sleep=True, sleep_secs=sleep_secs, readlines=True)
# This second command returns [b'\r\n', b'ERROR\r\n'] for some reason... why?
write_to_modem(modem, b"AT^CGPSINFO=1\r\n", sleep=True, sleep_secs=sleep_secs, readlines=True)
modem.flushInput()
modem.close()下面是运行上述程序的完整输出日志(为了可读性，添加了换行符)：
Initializing modem on port '/dev/ttyUSB3'...
Sleeping for 0.25 seconds...
Opening modem and flushing input and output...
Sleeping for 0.25 seconds...
Writing b'AT\r\n'...
Sleeping for 0.25 seconds...
[b'\r\n', b'OK\r\n']
Writing b'AT^CGPSINFO=1\r\n'...
Sleeping for 0.25 seconds...
[b'\r\n', b'ERROR\r\n']为什么在Socat中正常运行以下命令时，在运行PySerial时会出现错误"b'\r\n'，b' error \r\n'“？
echo 'AT+CGPSINFO' | socat - /dev/ttyUSB3,crnl
+CGPSINFO: 5100.505778,N,11404.437214,W,031120,175538.0,1076.7,0.0,348.0
OKStack Overflow用户
回答已采纳
发布于 2020-11-04 07:14:29
正如@meuh在评论中显示的那样，我使用的是^而不是+，所以将其改为b"AT+CGPSINFO=1\r\n"就解决了这个问题……
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/64668376
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