C语言编写modbus协议.docx

C语言编写modbus协议.docx

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C语言编写modbus协议

C语言编写modbus协议

modbus.c

＃include"main.h"

//字地址0-255（只取低8位）

//位地址0-255（只取低8位）

/*CRC高位字节值表*/

constuint8codeauchCRCHi[]={

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

};

/*CRC低位字节值表*/

constuint8codeauchCRCLo[]={

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

};

uint8testCoil;//用于测试位地址1

uint16testRegister;//用于测试字址址16

uint8localAddr=1;//单片机控制板的地址

uint8sendCount;//发送字节个数

uint8receCount;//接收到的字节个数

uint8sendPosi;//发送位置

uint16crc16（uint8*puchMsg,uint16usDataLen）

{

uint8uchCRCHi=0xFF;/*高CRC字节初始化*/

uint8uchCRCLo=0xFF;/*低CRC字节初始化*/

uint32uIndex;/*CRC循环中的索引*/

while（usDataLen--）/*传输消息缓冲区*/

{

uIndex=uchCRCHi^*puchMsg++;/*计算CRC*/

uchCRCHi=uchCRCLo^auchCRCHi[uIndex];

uchCRCLo=auchCRCLo[uIndex];

}

return（uchCRCHi<<8|uchCRCLo）;

}//uint16crc16（uint8*puchMsg,uint16usDataLen）

//开始发送

voidbeginSend（void）

//readCount=（receBuf[4]<<8）+receBuf[5];//要读的个数

readCount=receBuf[5];

byteCount=readCount*2;

for（i=0;i

{

getRegisterVal（tempAddr,&tempData）;

sendBuf[i+3]=tempData>>8;

sendBuf[i+4]=tempData&0xff;

}

sendBuf[0]=localAddr;

sendBuf[1]=3;

sendBuf[2]=byteCount;

byteCount+=3;

crcData=crc16（sendBuf,byteCount）;

sendBuf[byteCount]=crcData>>8;

byteCount++;

sendBuf[byteCount]=crcData&0xff;

sendCount=byteCount+1;

beginSend（）;

}//voidreadRegisters（void）

//强制单个线圈

voidforceSingleCoil（void）

{

uint8addr;

uint8tempAddr;

uint16tempData;

uint8onOff;

uint8i;

//addr=（receBuf[2]<<8）+receBuf[3];

//tempAddr=addr&0xfff;

addr=receBuf[3];

tempAddr=addr;

//onOff=（receBuf[4]<<8）+receBuf[5];

onOff=receBuf[4];

//if（onOff==0xff00）

if（onOff==0xff）

{//设为ON

tempData=1;

}

//elseif（onOff==0x0000）

elseif（onOff==0x00）

{//设为OFF

tempData=0;

}

setCoilVal（tempAddr,tempData）;

for（i=0;i

{

sendBuf[i]=receBuf[i];

}

sendCount=receCount;

beginSend（）;

}//voidforceSingleCoil（void）

//设置多个寄存器

voidpresetMultipleRegisters（void）

{

uint8addr;

uint8tempAddr;

uint8byteCount;

uint8setCount;

uint16crcData;

uint16tempData;

uint8finsh;//为1时完成为0时出错

uint8i;

//addr=（receBuf[2]<<8）+receBuf[3];

//tempAddr=addr&0xfff;

addr=receBuf[3];

tempAddr=addr&0xff;

//setCount=（receBuf[4]<<8）+receBuf[5];

setCount=receBuf[5];

byteCount=receBuf[6];

for（i=0;i

{

tempData=（receBuf[i*2+7]<<8）+receBuf[i*2+8];

setRegisterVal（tempAddr,tempData）;

}

sendBuf[0]=localAddr;

sendBuf[1]=16;

sendBuf[2]=addr>>8;

sendBuf[3]=addr&0xff;

sendBuf[4]=setCount>>8;

sendBuf[5]=setCount&0xff;

crcData=crc16（sendBuf,6）;

sendBuf[6]=crcData>>8;

sendBuf[7]=crcData&0xff;

sendCount=8;

beginSend（）;

}//voidpresetMultipleRegisters（void）

//检查uart0数据

voidcheckComm0Modbus（void）

{

uint16crcData;

uint16tempData;

if（receCount>4）

{

switch（receBuf[1]）

{

case1:

//读取线圈状态（读取点16位以内）

case3:

//读取保持寄存器（一个或多个）

case5:

//强制单个线圈

case6:

//设置单个寄存器

if（receCount>=8）

{//接收完成一组数据

//应该关闭接收中断

if（receBuf[0]==localAddr&&checkoutError==0）

{

crcData=crc16（receBuf,6）;

if（crcData==receBuf[7]+（receBuf[6]<<8））

{//校验正确

if（receBuf[1]==1）

{//读取线圈状态（读取点16位以内）

readCoil（）;

}

elseif（receBuf[1]==3）

{//读取保持寄存器（一个或多个）

readRegisters（）;

}

elseif（receBuf[1]==5）

{//强制单个线圈

forceSingleCoil（）;

}

elseif（receBuf[1]==6）

{

//presetSingleRegister（）;

}

}

}

receCount=0;

checkoutError=0;

}

break;

case15:

//设置多个线圈

tempData=receBuf[6];

tempData+=9;//数据个数

if（receCount>=tempData）

{

if（receBuf[0]==localAddr&&checkoutError==0）

{

crcData=crc16（receBuf,tempData-2）;

if（crcData==（receBuf[tempData-2]<<8）+receBuf[tempData-1]）

{

//forceMultipleCoils（）;

}

}

receCount=0;

checkoutError=0;

}

break;

case16:

//设置多个寄存器

tempData=（receBuf[4]<<8）+receBuf[5];

tempData=tempData*2;//数据个数

tempData+=9;

if（receCount>=tempData）

{

if（receBuf[0]==localAddr&&checkoutError==0）

{

crcData=crc16（receBuf,tempData-2）;

if（crcData==（receBuf[tempData-2]<<8）+receBuf[tempData-1]）

{

presetMultipleRegisters（）;

}

}

receCount=0;

checkoutError=0;

}

break;

default:

break;

}

}

}//voidcheckComm0（void）

//取线圈状态返回0表示成功

uint16getCoilVal（uint16addr,uint16*tempData）

{

uint16result=0;

uint16tempAddr;

tempAddr=addr&0xfff;

//只取低8位地址

switch（tempAddr&0xff）

{

case0:

break;

case1:

*tempData=testCoil;

break;

case2:

break;

case3:

break;

case4:

break;

case5:

break;

case6:

break;

case7:

break;

case8:

break;

case9:

break;

case10:

break;

case11:

break;

case12:

break;

case13:

break;

case14:

break;

case15:

break;

case16:

break;

default:

break;

}

returnresult;

}//uint16getCoilVal（uint16addr,uint16*data）

//设定线圈状态返回0表示成功

uint16setCoilVal（uint16addr,uint16tempData）

{

uint16result=0;

uint16tempAddr;

tempAddr=addr&0xfff;

switch（tempAddr&0xff）

{

case0:

break;

case1:

testCoil=tempData;

break;

case2:

break;

case3:

break;

case4:

break;

case5:

break;

case6:

break;

case7:

break;

case8:

break;

case9:

break;

case10:

break;

case11:

break;

case12:

break;

case13:

break;

case14:

break;

case15:

break;

case16:

break;

default:

break;

}

returnresult;

}//uint16setCoilVal（uint16addr,uint16data）

//取寄存器值返回0表示成功

uint16getRegisterVal（uint16addr,uint16*tempData）

{

uint16result=0;

uint16tempAddr;

tempAddr=addr&0xfff;

switch（tempAddr&0xff）

{

case0:

break;

case1:

break;

case2:

break;

case3:

break;

case4:

break;

case5:

break;

case6:

break;

case7:

break;

case8:

break;

case9:

break;

case10:

break;

case11:

break;

case12:

break;

case13:

break;

case14:

break;

case15:

break;

case16:

*tempData=testRegister;

break;

default:

break;

}

returnresult;

}//uint16getRegisterVal（uint16addr,uint16&data）

//设置寄存器值返回0表示成功

uint16setRegisterVal（uint16addr,uint16tempData）

{

uint16result=0;

uint16tempAddr;

tempAddr=addr&0xfff;

switch（tempAddr&0xff）

{

case0:

break;

case1:

break;

case2:

break;

case3:

break;

case4:

break;

case5:

break;

case6:

break;

case7:

break;

case8:

break;

case9:

break;

case10:

break;

case11:

break;

case12:

break;

case13: