Raspberry pi 3 B +中的串行通信 [英] Serial Communication in Raspberry pi 3 B+

问题描述

我想在Raspberry pi 3 B +和GSM GPRS A6之间进行通信.我尝试过，但无法从Raspberry pi向GPRS模块发送数据.

I want to communicate between Raspberry pi 3 B+ and GSM GPRS A6. I tried and I am unable to send data to GPRS Module from Raspberry pi.

现在，我知道在较新的操作系统中(默认情况下为Raspbian Stretch)默认情况下禁用GPIO串行端口，因此我已通过在config.txt文件中添加以下行来启用了它，

Now, I know that GPIO serial port is disabled by default in newer Operating Systems (in my case Raspbian Stretch), so I have enabled it by adding following line in config.txt file,

enable_uart=1

这是我的代码:

import serial
import time

port = "/dev/ttyS0"
COMM = serial.Serial(port, baudrate=115200)

while(1):
    COMM.write("AT\r")
    print (COMM.read(5))

该命令应该返回"OK"，但不会返回任何内容.我正在使用python 2.7.

This command is supposed to return "OK", but it does not and nothing is printed. I am using python 2.7.

有人建议我使用这种方法发送数据，

Some people suggested me to send data using this method,

COMM.write('AT' + '\r')

我尝试过，但是没有帮助.

I tried but it didn't help.

我的GPRS模块没有问题.它与arduino一起工作. 那么，我在这里做错了什么?

There is no problem with my GPRS module. It works file with arduino. So, what am I doing wrong here?

提前谢谢！

推荐答案

， 首先，请确保启用序列号.

, First , be sure to enable the Serial.

sudo raspi-config ->接口选项->串行

sudo raspi-config -> Interfacing Option -> Serial

第二， sudo nano/boot/cmdline.txt

删除"console = serial，115200"

Delete "console=serial,115200"

然后 sudo nano/boot/config.txt

添加结尾

dtoverlay = pi3-disable-bt core_freq = 250

dtoverlay=pi3-disable-bt core_freq=250

在使用时:Serial(/dev/ ttyAMA0 ，9600)

While you use : Serial(/dev/ttyAMA0,9600)

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