1月 172015
 

最近做了一个usb转RS485的通讯程序,第一次做和硬件相关的程序。记录一下以作备份。

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private const byte MB_READ_COILS = 0x01;             //读线圈寄存器

private const byte MB_READ_DISCRETE = 0x02;          //读离散输入寄存器

private const byte MB_READ_HOLD_REG = 0x03;          //读保持寄存器

private const byte MB_READ_INPUT_REG = 0x04;         //读输入寄存器

private const byte MB_WRITE_SINGLE_COIL = 0x05;      //写单个线圈

private const byte MB_WRITE_SINGLE_REG = 0x06;       //写单寄存器

private const byte MB_WRITE_MULTIPLE_COILS = 0x0f;   //写多线圈

private const byte MB_WRITE_MULTIPLE_REGS = 0x10;    //写多寄存器

private static SerialPort sp = new SerialPort();     //端口号

private static volatile byte[] buff = new byte[1024];//接收缓冲器

//配置串口

public static void MBConfig(string spname, int baud, int parity)

{

sp.PortName = spname;

sp.BaudRate = baud;

if (parity == 0) sp.Parity = Parity.None;

if (parity == 1) sp.Parity = Parity.Odd;

if (parity == 2) sp.Parity = Parity.Even;

}

//打开串口

public static void MBOpen()

{

try

{

if(!sp.IsOpen)

sp.Open();

}

catch(Exception ex)

{MessageBox.Show(ex.ToString());}

}

//关闭串口

public static void MBClose()

{sp.Close();}

打开端口后,通过Fecth函数处理校验码、发送接收数据

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private static byte[] Fetch(byte[] cmd)

{

try

{

MBOpen();

sp.ReadTimeout = 100;

byte[] cmd1 = new byte[cmd.Length + 2];

byte[] crc = TypeConverter.int2byte2(Crc16(cmd, cmd.Length));

byte[] readout = new byte[1024];

int readsize = 0;

cmd.CopyTo(cmd1, 0);

cmd1[cmd1.Length - 2] = crc[0];

cmd1[cmd1.Length - 1] = crc[1];

sp.Write(cmd1, 0, cmd1.Length);

Thread.Sleep(100);

int readCount = sp.BytesToRead;

while (readCount > 0)

{

byte[] rcv_buff = new byte[readCount];

sp.Read(rcv_buff, 0, readCount);

rcv_buff.CopyTo(readout, readsize);

readsize = readsize + readCount;

Thread.Sleep(20);

readCount = sp.BytesToRead;

}

if (readsize > 3)

{

byte[] rt2 = new byte[readsize];

byte[] forCrc = new byte[rt2.Length - 2];

byte[] rcvCrc = new byte[2];

for (int i = 0; i < rt2.Length; i++)

{

rt2[i] = readout[i];

}

for (int i = 0; i < forCrc.Length; i++)

{

forCrc[i] = readout[i];

}

rcvCrc[0] = rt2[rt2.Length - 2];

rcvCrc[1] = rt2[rt2.Length - 1];

byte[] calcCrc = TypeConverter.int2byte2(Crc16(forCrc, forCrc.Length));

if ((calcCrc[0] == rcvCrc[0]) && (calcCrc[1] == rcvCrc[1]))

{

return forCrc;

}

}

}

catch{}

return null;

}

private static readonly byte[] aucCRCHi = {

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,

0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,

0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,

0x00, 0xC1, 0x81, 0x40

};

private static readonly byte[] aucCRCLo = {

0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,

0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,

0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,

0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,

0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,

0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,

0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,

0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,

0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,

0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,

0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,

0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,

0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,

0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,

0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,

0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,

0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,

0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,

0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,

0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,

0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,

0x41, 0x81, 0x80, 0x40

};

/// <summary>

/// CRC效验

/// </summary>

/// <param name="pucFrame">效验数据</param>

/// <param name="usLen">数据长度</param>

/// <returns>效验结果</returns>

public static int Crc16(byte[] pucFrame, int usLen)

{

int i = 0;

byte ucCRCHi = 0xFF;

byte ucCRCLo = 0xFF;

UInt16 iIndex = 0x0000;

while (usLen-- > 0)

{

iIndex = (UInt16)(ucCRCLo ^ pucFrame[i++]);

ucCRCLo = (byte)(ucCRCHi ^ aucCRCHi[iIndex]);

ucCRCHi = aucCRCLo[iIndex];

}

return (ucCRCHi << 8 | ucCRCLo);

}