安卓USB串口通信，关于波特率设置

谁能告诉我下面两种波特率设置方法是什么意思？
第一种是网上的：

  private boolean configUsb(int paramInt) 
    {
        byte[] arrayOfByte = new byte[8];
        connection.controlTransfer(192, 95, 0, 0, arrayOfByte, 8, 1000);
        connection.controlTransfer(64, 161, 0, 0, null, 0, 1000);
        long l1 = 1532620800 / paramInt;
        for (int i = 3; ; i--) {
            if ((l1 <= 65520L) || (i <= 0)) {
                long l2 = 65536L - l1;
                int j = (short) (int) (0xFF00 & l2 | i);
                int k = (short) (int) (0xFF & l2);
                connection.controlTransfer(64, 154, 4882, j, null, 0, 1000);
                connection.controlTransfer(64, 154, 3884, k, null, 0, 1000);
                connection.controlTransfer(192, 149, 9496, 0, arrayOfByte, 8, 1000);
                connection.controlTransfer(64, 154, 1304, 80, null, 0, 1000);
                connection.controlTransfer(64, 161, 20511, 55562, null, 0, 1000);
                connection.controlTransfer(64, 154, 4882, j, null, 0, 1000);
                connection.controlTransfer(64, 154, 3884, k, null, 0, 1000);
                connection.controlTransfer(64, 164, 0, 0, null, 0, 1000);
                return true;
            }
            l1 >>= 3;
        }
    }

第二种是H34驱动里的：

public boolean SetConfig(int baudRate, byte dataBit, byte stopBit, byte parity, byte flowControl){
        int value = 0;
        int index = 0;
        char valueHigh = 0, valueLow = 0, indexHigh = 0, indexLow = 0;
        switch(parity) {
            case 0: /*NONE*/
                valueHigh = 0x00;
                break;
            case 1: /*ODD*/
                valueHigh |= 0x08;
                break;
            case 2: /*Even*/
                valueHigh |= 0x18;
                break;
            case 3: /*Mark*/
                valueHigh |= 0x28;
                break;
            case 4: /*Space*/
                valueHigh |= 0x38;
                break;
            default:    /*None*/
                valueHigh = 0x00;
                break;
        }
        if(stopBit == 2) {
            valueHigh |= 0x04;
        }

        switch(dataBit) {
            case 5:
                valueHigh |= 0x00;
                break;
            case 6:
                valueHigh |= 0x01;
                break;
            case 7:
                valueHigh |= 0x02;
                break;
            case 8:
                valueHigh |= 0x03;
                break;
            default:
                valueHigh |= 0x03;
                break;
        }

        valueHigh |= 0xc0;
        valueLow = 0x9c;

        value |= valueLow;
        value |= (int)(valueHigh << 8);

        switch(baudRate) {
            case 50:
                indexLow = 0;
                indexHigh = 0x16;
                break;
            case 75:
                indexLow = 0;
                indexHigh = 0x64;
                break;
            case 110:
                indexLow = 0;
                indexHigh = 0x96;
                break;
            case 135:
                indexLow = 0;
                indexHigh = 0xa9;
                break;
            case 150:
                indexLow = 0;
                indexHigh = 0xb2;
                break;    
            case 300:
                indexLow = 0;
                indexHigh = 0xd9;
                break;
            case 600:
                indexLow = 1;
                indexHigh = 0x64;
                break;
            case 1200:
                indexLow = 1;
                indexHigh = 0xb2;
                break;
            case 1800:
                indexLow = 1;
                indexHigh = 0xcc;
                break;
            case 2400:
                indexLow = 1;
                indexHigh = 0xd9;
                break;
            case 4800:
                indexLow = 2;
                indexHigh = 0x64;
                break;
            case 9600:
                indexLow = 2;
                indexHigh = 0xb2;
                break;
            case 19200:
                indexLow = 2;
                indexHigh = 0xd9;
                break;
            case 38400:
                indexLow = 3;
                indexHigh = 0x64;
                break;
            case 57600:
                indexLow = 3;
                indexHigh = 0x98;
                break;
            case 115200:
                indexLow = 3;
                indexHigh = 0xcc;
                break;
            case 230400:
                indexLow = 3;
                indexHigh = 0xe6;
                break;
            case 460800:
                indexLow = 3;
                indexHigh = 0xf3;
                break;                  
            case 500000:
                indexLow = 3;                                    
                indexHigh = 0xf4;
                break;
            case 921600:
                indexLow = 7;
                indexHigh = 0xf3;
                break;
            case 1000000:
                indexLow = 3;
                indexHigh = 0xfa;
                break;
            case 2000000:
                indexLow = 3;
                indexHigh = 0xfd;
                break;
            case 3000000:
                indexLow = 3;
                indexHigh = 0xfe;
                break;
            default:    // default baudRate "9600"
                indexLow = 2;
                indexHigh = 0xb2;
                break; 
        }
        index |= 0x88 |indexLow;
        index |= (int)(indexHigh << 8);

        Uart_Control_Out(161, value, index);
       /* if(flowControl == 1) {
            Uart_Tiocmset(UartModem.TIOCM_DTR | UartModem.TIOCM_RTS, 0x00);
        }*/
        return true;
    }
}
 int DEFAULT_TIMEOUT=1000;
    public int Uart_Control_Out(int request, int value, int index)
    {
        int retval = 0;
        retval = connection.controlTransfer(64,
                                                   request, value, index, null, 0, DEFAULT_TIMEOUT);
        L.add("64，"+ request+"，"+value+"，"+index+"，"+null+"，0， "+DEFAULT_TIMEOUT);
        return retval;
    }

以上两种都是可行的，第二种加了其他设置