Beaglebone Black 串行 C++ [英] Beaglebone Black Serial c++

问题描述

在 C++ 中进行串行工作似乎很痛苦，此外，在 Beaglebone Black 上进行串行工作很困难，所以我需要有一些专业知识的人！

It seems to be a pain to get serial working in c++, adding to that, to do it on the Beaglebone Black is hard, so I need someone with some expertise!

我使用以下命令创建了/dev/ttyO4:

I created /dev/ttyO4 with the following command:

echo BB-UART4 > /sys/devices/bone_capemgr.9/slots

这给了我/dev/ttyO4.然后，我使用在 此处 链接的库在 cpp 中编写了一个小程序.我的代码如下:

This gives me /dev/ttyO4. I then write a small program in cpp using a library linked here. My code is found below:

#include <stdio.h>
#include "serialib.h"


#if defined (_WIN32) || defined( _WIN64)
#define         DEVICE_PORT             "COM1"                               // COM1 for windows
#endif

#ifdef __linux__
#define         DEVICE_PORT             "/dev/ttyO4"                         // ttyS0 for linux
#endif


int main()
{
    serialib LS;                                                            // Object of the serialib class
    int Ret;                                                                // Used for return values
    char Buffer[128];

    // Open serial port

    Ret=LS.Open(DEVICE_PORT,115200);                                        // Open serial link at 115200 bauds
    if (Ret!=1) {                                                           // If an error occured...
        printf ("Error while opening port. Permission problem ?\n");        // ... display a message ...
        return Ret;                                                         // ... quit the application
    }
    printf ("Serial port opened successfully !\n");

    // Write the AT command on the serial port

    Ret=LS.WriteString("AT\n");                                             // Send the command on the serial port
    if (Ret!=1) {                                                           // If the writting operation failed ...
        printf ("Error while writing data\n");                              // ... display a message ...
        return Ret;                                                         // ... quit the application.
    }
    printf ("Write operation is successful \n");

    // Read a string from the serial device
    Ret=LS.ReadString(Buffer,'\n',128,5000);                                // Read a maximum of 128 characters with a timeout of 5 seconds
                                                                        // The final character of the string must be a line feed ('\n')
    if (Ret>0)                                                              // If a string has been read from, print the string
        printf ("String read from serial port : %s",Buffer);
    else
        printf ("TimeOut reached. No data received !\n");                   // If not, print a message.

    // Close the connection with the device

    LS.Close();

    return 0;
}

当我运行代码时，它说它成功打开端口并成功串行写入，但我在RX上没有收到任何数据.我已将 RX 引脚连接到 UART4(P9.11 和 P9.13)的 TX 引脚.我还连接了 UART5 的 RX 和 TX 引脚以防万一(P8.37 和 P8.38)，因为 ttyO4 使我对我使用的 UART 有点困惑.

When I run the code, it says it opened the port successfully and successfully wrote serially, but I receive no data on the RX. I have connected the RX pin to the TX pin for UART4 (P9.11 and P9.13). I also connected the RX and TX pins for UART5 just incase (P8.37 and P8.38), as the ttyO4 confused me a bit as to which UART I'm using.

我是否缺少让串行端口正常工作的东西?或者有人可以向我推荐一个在 beaglebone black 上使用 c++ 进行串行通信的工作示例，也许就像一个分步指南?

Is there something I'm missing to get the serial port working? Or can someone refer me to a working example for serial communication with c++ on the beaglebone black, perhaps like a step-by-step guide?

问候，康奈尔

Boost 串行库比 serialib 更可靠，请在此处找到它们.

The Boost serial libraries work more reliably than serialib, find them here.

推荐答案

更正 [-Wconversion-null] 错误:打开serialib.cpp"文件并转到ReadStringNoTimeOut"函数.

to correct the [-Wconversion-null] error: Open 'serialib.cpp' file and go to the 'ReadStringNoTimeOut' function.

改变

ret=ReadChar(&String[NbBytes]);

到

ret=ReadChar(&String[NbBytes],0);

这篇关于Beaglebone Black 串行 C++的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！