Ubuntu 17.04编译串口发送16进制数据包报了个神奇的错误

最新推荐文章于 2024-05-14 12:54:54 发布

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最新推荐文章于 2024-05-14 12:54:54 发布 · 1.6k 阅读

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#Ubuntu #xgcom #串口通信

调试系统环境：Ubuntu 17.04 + Clion 17.1

今天在调试Ubuntu 系统通过串口发送16进制数据时，我发现了一个很神奇的问题现象。

先看看下面的代码：

    //char  *data = "hello world dhs!";
    char  data[9] = {0x11,0x22,0x33,0x11,0x22,0x33,0x11,0x22,0x33};
    //data[0] = 0xAA;

    //int datalen = strlen(data);
    
    //send data
    //while (1)
    {
        for (int i = 0; i < 100; i++)
        {
            SendLen = PortSend(fd, data, 9);
            if (SendLen > 0) {
                printf("No %d send %d data.\n", i, SendLen);
            } else {
                printf("Error: send failed.\n");
            }
            sleep(1);
        }
    }

然后在Clion 中进行编译，发现编译很完美，并能够通过 xgcom（一款Linux下的带GUI的串口调试助手）接收到16进制数据。

再看看以下代码：

    //char  *data = "hello world dhs!";
    char  data[2] = {0x11,0x22,0x33,0x11,0x22,0x33,0x11,0x22,0x88};
    //data[0] = 0xAA;

    //int datalen = strlen(data);
    
    //send data
    //while (1)
    {
        for (int i = 0; i < 100; i++)
        {
            SendLen = PortSend(fd, data, 2);
            if (SendLen > 0) {
                printf("No %d send %d data.\n", i, SendLen);
            } else {
                printf("Error: send failed.\n");
            }
            sleep(1);
        }
    }

然后再Clion中编译源代码时，就发现报错了，错误信息如下：

/home/dhs/桌面/serial_dhs/serail (cpp)/serial.cpp:305:66: error: narrowing conversion of ‘136’ from ‘int’ to ‘char’ inside { } [-Wnarrowing]
     char  data[9] = {0x11,0x22,0x33,0x11,0x22,0x33,0x11,0x22,0x88};
                                                                  ^
CMakeFiles/serail.dir/build.make:62: recipe for target 'CMakeFiles/serail.dir/serial.cpp.o' failed
make[3]: *** [CMakeFiles/serail.dir/serial.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/serail.dir/all' failed
make[2]: *** [CMakeFiles/serail.dir/all] Error 2
CMakeFiles/Makefile2:79: recipe for target 'CMakeFiles/serail.dir/rule' failed
make[1]: *** [CMakeFiles/serail.dir/rule] Error 2
Makefile:118: recipe for target 'serail' failed
make: *** [serail] Error 2

经过我多次测试，终于发现了一个很神奇的错误现象。
当发送的16进制数据包中有数据大于255时，便会编译报错。