51单片机的MODBUS C语言程序…

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原文地址：C语言程序(从机)">51单片机的MODBUS C语言程序(从机)作者：免费单片机教程及

#include "reg52.h"

typedef unsigned char uint8

typedef unsigned int uint16

uint8 sendCount;

uint8 receCount;

uint8 sendPosi;

//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 ///

const uint8 code auchCRCHi[] = {

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///

const uint8 code auchCRCLo[] = {

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

} ;

uint8 testCoil; //用于测试位地址1

uint16 testRegister; //用于测试字址址16

uint8 localAddr = 1; //单片机控制板的地址

uint8 sendCount; //发送字节个数

uint8 receCount; //接收到的字节个数

uint8 sendPosi; //发送位置

uint16 crc16(uint8 //puchMsg, uint16 usDataLen)

{

uint8 uchCRCHi = 0xFF ;/// 高CRC字节初始化 ///

uint8 uchCRCLo = 0xFF ;/// 低CRC 字节初始化 ///

uint32 uIndex ; ///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) ;

}//uint16 crc16(uint8 //puchMsg, uint16 usDataLen)

//开始发送

void beginSend(void)

{

b485Send = 1; //设为发送

sendPosi = 0;

if(sendCount> 1)

sendCount--;

ACC = sendBuf[0];

TB8 = P;

SBUF = sendBuf[0];

}//void beginSend(void)

//读线圈状态

void readCoil(void)

{

uint8 addr;

uint8 tempAddr;

uint8 byteCount;

uint8 bitCount;

uint16 crcData;

uint8 position;

uint8 i,k;

uint8 result;

uint16 tempData;

uint8 exit = 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<byteCount;k++)

{//字节位置

position = k + 3;

sendBuf[position] = 0;

for(i=0;i<8;i++)

{

getCoilVal(tempAddr,&tempData);

sendBuf[position] |= tempData << i;

tempAddr++;

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();

}//void readCoil(void)

//读寄存器

void readRegisters(void)

{

uint8 addr;

uint8 tempAddr;

uint16 result;

uint16 crcData;

uint8 readCount;

uint8 byteCount;

uint8 finsh; //1完成 0出错

uint16 i;

uint16 tempData = 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<byteCount;i+=2,tempAddr++)

{

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();

}//void readRegisters(void)

//强制单个线圈

void forceSingleCoil(void)

{

uint8 addr;

uint8 tempAddr;

uint16 tempData;

uint8 onOff;

uint8 i;

//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;

}

//else if(onOff ==0x0000)

else if(onOff == 0x00)

{ //设为OFF

tempData = 0;

}

setCoilVal(tempAddr,tempData);

for(i=0;i<receCount;i++)

{

sendBuf[i] = receBuf[i];

}

sendCount = receCount;

beginSend();

}//void forceSingleCoil(void)

//设置多个寄存器

void presetMultipleRegisters(void)

{

uint8 addr;

uint8 tempAddr;

uint8 byteCount;

uint8 setCount;

uint16 crcData;

uint16 tempData;

uint8 finsh; //为1时完成为0时出错

uint8 i;

//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<setCount;i++,tempAddr++)

{

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();

}//void presetMultipleRegisters(void)

//检查uart0数据

void checkComm0Modbus(void)

{

uint16 crcData;

uint16 tempData;

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();

}

else if(receBuf[1] == 3)

{//读取保持寄存器(一个或多个)

readRegisters();

}

else if(receBuf[1] == 5)

{//强制单个线圈

forceSingleCoil();

}

else if(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;

}

}//void checkComm0(void)

//取线圈状态返回0表示成功

uint16 getCoilVal(uint16 addr,uint16 //tempData)

{

uint16 result = 0;

uint16 tempAddr;

tempAddr = addr& 0xfff;

//只取低8位地址

switch(tempAddr& 0xff)

{

case 0:

break;

case 1:

//tempData = testCoil;

break;

case 2:

break;

case 3:

break;

case 4:

break;

case 5:

break;

case 6:

break;

case 7:

break;

case 8:

break;

case 9:

break;

case 10:

break;

case 11:

break;

case 12:

break;

case 13:

break;

case 14:

break;

case 15:

break;

case 16:

break;

default:

break;

}

return result;

}//uint16 getCoilVal(uint16 addr,uint16 //data)

//设定线圈状态返回0表示成功

uint16 setCoilVal(uint16 addr,uint16 tempData)

{

uint16 result = 0;

uint16 tempAddr;

tempAddr = addr& 0xfff;

switch(tempAddr& 0xff)

{

case 0:

break;

case 1:

testCoil = tempData;

break;

case 2:

break;

case 3:

break;

case 4:

break;

case 5:

break;

case 6:

break;

case 7:

break;

case 8:

break;

case 9:

break;

case 10:

break;

case 11:

break;

case 12:

break;

case 13:

break;

case 14:

break;

case 15:

break;

case 16:

break;

default:

break;

}

return result;

}//uint16 setCoilVal(uint16 addr,uint16 data)

//取寄存器值返回0表示成功

uint16 getRegisterVal(uint16 addr,uint16 //tempData)

{

uint16 result = 0;

uint16 tempAddr;

tempAddr = addr& 0xfff;

switch(tempAddr& 0xff)

{

case 0:

break;

case 1:

break;

case 2:

break;

case 3:

break;

case 4:

break;

case 5:

break;

case 6:

break;

case 7:

break;

case 8:

break;

case 9:

break;

case 10:

break;

case 11:

break;

case 12:

break;

case 13:

break;

case 14:

break;

case 15:

break;

case 16:

//tempData = testRegister;

break;

default:

break;

}

return result;

}//uint16 getRegisterVal(uint16 addr,uint16&data)

//设置寄存器值返回0表示成功

uint16 setRegisterVal(uint16 addr,uint16 tempData)

{

uint16 result = 0;

uint16 tempAddr;

tempAddr = addr& 0xfff;

switch(tempAddr& 0xff)

{

case 0:

break;

case 1:

break;

case 2:

break;

case 3:

break;

case 4:

break;

case 5:

break;

case 6:

break;

case 7:

break;

case 8:

break;

case 9:

break;

case 10:

break;

case 11:

break;

case 12:

break;

case 13:

break;

case 14:

break;

case 15:

break;

case 16:

testRegister = tempData;

break;

default:

break;

}

return result;

}

单片机教程：http://www.ipbb.cn

51单片机的MODBUS&nbsp;C语言程序…

51单片机的MODBUS C语言程序…