打开串口

定义的JNI方法

image.png

c代码

image.png

• 设置波特率方法

int set_opt(int fb,int nSpeed,int nBits,char nEvent,int nStop)
{
    struct termios newtio,oldtio;
    if(tcgetattr(fb,&oldtio)!=0)
    {
        perror("error:SetupSerial 3\n");
        return -1;
    }
    bzero(&newtio,sizeof(newtio));
    //使能串口接收
    newtio.c_cflag |= CLOCAL | CREAD;
    newtio.c_cflag &= ~CSIZE;

    newtio.c_lflag &=~ICANON;//原始模式

    //newtio.c_lflag |=ICANON; //标准模式

    //设置串口数据位
    switch(nBits)
    {
        case 7:
            newtio.c_cflag |= CS7;
            break;
        case 8:
            newtio.c_cflag |=CS8;
            break;
    }
    //设置奇偶校验位
    switch(nEvent)

    {
        case 'O':
            newtio.c_cflag |= PARENB;
            newtio.c_cflag |= PARODD;
            newtio.c_iflag |= (INPCK | ISTRIP);
            break;
        case 'E':
            newtio.c_iflag |= (INPCK | ISTRIP);
            newtio.c_cflag |= PARENB;
            newtio.c_cflag &= ~PARODD;
            break;
        case 'N':
            newtio.c_cflag &=~PARENB;
            break;
    }
    //设置串口波特率
    switch(nSpeed)
    {
        case 2400:
            cfsetispeed(&newtio,B2400);
            cfsetospeed(&newtio,B2400);
            break;
        case 4800:
            cfsetispeed(&newtio,B4800);
            cfsetospeed(&newtio,B4800);
            break;
        case 9600:
            cfsetispeed(&newtio,B9600);
            cfsetospeed(&newtio,B9600);
            break;
        case 115200:
            cfsetispeed(&newtio,B115200);
            cfsetospeed(&newtio,B115200);
            break;
        case 460800:
            cfsetispeed(&newtio,B460800);
            cfsetospeed(&newtio,B460800);
            break;
        default:
            cfsetispeed(&newtio,B9600);
            cfsetospeed(&newtio,B9600);
            break;
    }
    //设置停止位
    if(nStop == 1)
        newtio.c_cflag &= ~CSTOPB;
    else if(nStop == 2)
        newtio.c_cflag |= CSTOPB;
    newtio.c_cc[VTIME] = 5;
    newtio.c_cc[VMIN] = 0;
    tcflush(fb,TCIFLUSH);

    if(tcsetattr(fb,TCSANOW,&newtio)!=0)
    {
        perror("com set error\n");
        return -1;
    }
    return 0;
}

关闭串口

定义的JNI方法

image.png

c代码

image.png

读取串口数据

定义的JNI方法

image.png

c代码

image.png

写数据到串口

定义的JNI方法

image.png

c代码

image.png

获取串口描述符

定义的JNI方法

image.png

c代码

JNIEXPORT jobject JNICALL Java_com_uniubi_uface_ether_outdevice_serialport_OutDeviceSerialPort_getFileDescriptor
  (JNIEnv * env, jobject object, jint fd ){
    jobject mFileDescriptor;
    {
        struct termios cfg;
        if (tcgetattr(fd, &cfg))
        {
            LOGI("tcgetattr() failed");
            close(fd);
            /* TODO: throw an exception */
            return NULL;
        }

        cfmakeraw(&cfg);
        if (tcsetattr(fd, TCSANOW, &cfg))
        {
            LOGI("tcsetattr() failed");
            close(fd);
            /* TODO: throw an exception */
            return NULL;
        }
    }
    {
        jclass cFileDescriptor = (*env)->FindClass(env, "java/io/FileDescriptor");
        jmethodID iFileDescriptor = (*env)->GetMethodID(env, cFileDescriptor, "<init>", "()V");
        jfieldID descriptorID = (*env)->GetFieldID(env, cFileDescriptor, "descriptor", "I");
        mFileDescriptor = (*env)->NewObject(env, cFileDescriptor, iFileDescriptor);
        (*env)->SetIntField(env, mFileDescriptor, descriptorID, (jint)fd);
    }
    return mFileDescriptor;
  }

写韦根

定义的JNI方法

image.png

c代码

image.png