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 关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf */constuint8codeauchCRCHi[]={TOC\o"1-5"\h\z0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40,0x01,0xC0,0x80,0x41,0x01,0xC0,0x80,0x41,0x00,0xC1,0x81,0x40};/*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1uint16testRegister;//用于测试字址址16uint8localAddr=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*/uint32ulndex;/*CRC循环中的索引*/while(usDataLen--)/*传输消息缓冲区*/{ulndex=uchCRCHi八*puchMsg++;/*计算CRC*/uchCRCHi=uchCRCLo八auchCRCHi[uIndex];uchCRCLo=auchCRCLo[uIndex];}return(uchCRCHi<<8|uchCRCLo);}//uint16crc16(uint8*puchMsg,uint16usDataLen)//开始发送voidbeginSend(void){b485Send=1;//设为发送sendPosi=0;if(sendCount>1)sendCount--;ACC=sendBuf[0];TB8=P;SBUF=sendBuf[0];}//voidbeginSend(void)//读线圈状态voidreadCoil(void){uint8addr;uint8tempAddr;uint8byteCount;uint8bitCount;uint16crcData;uint8position;uint8i,k;uint8result;uint16tempData;uint8exit=0;//addr=(receBuf[2]<<8)+receBuf[3];//tempAddr=addr&0xfff;addr=receBuf[3];tempAddr=addr;//bitCount=(receBuf[4]<<8)+receBuf[5];//读取的位个数bitCount=receBuf[5];byteCount=bitCount/8;//字节个数if(bitCount%8!=0)byteCount++;for(k=0;k=addr+bitCount)if(tempAddr>=addr+bitCount){//读完exit=1;break;}}if(exit==1)break;}sendBuf[0]=localAddr;sendBuf[1]=0x01;sendBuf[2]=byteCount;byteCount+=3;crcData=crc16(sendBuf,byteCount);sendBuf[byteCount]=crcData>>8;byteCount++;sendBuf[byteCount]=crcData&0xff;sendCount=byteCount+1;beginSend();}//voidreadCoil(void)/读寄存器voidreadRegisters(void){uint8addr;uint8tempAddr;uint16result;uint16crcData;uint8readCount;uint8byteCount;uint8finsh;//1完成0出错uint16i;uint16tempData=0;//addr=(receBuf[2]<<8)+receBuf[3];//tempAddr=addr&0xfff;addr=receBuf[3];tempAddr=addr;//readCount=(receBuf[4]<<8)+receBuf[5];//要读的个数readCount=receBuf[5];byteCount=readCount*2;for(i=0;i>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ONtempData=1;}//elseif(onOff==0x0000)elseif(onOff==0x00){〃设为OFFtempData=0;}setCoilVal(tempAddr,tempData);for(i=0;i>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uartO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;*tempData=testCoil;break;break;break;break;break;break;break;break;break;break;break;break;break;break;break;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;testCoil=tempData;break;break;break;break;break;break;break;break;break;break;break;break;break;break;break;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;break;break;break;break;break;break;break;break;break;break;break;break;break;break;break;*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;break;break;break;break;break;break;break;break;break;break;break;break;break;break;break;testRegister=tempData;break;default:break;returnresult;}//uint8setRegisterVal(uint16addr,uint16data)