51单片机实现Modbus从机程序.docx
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51单片机实现Modbus从机程序
自己用单片机做的Modbus从机，可以使用STC89C52。
实现了命令码为1、2、3、4、5、6的功能，程序中有些是我们部分其他功能的函数和数据，希望大家参考下编程的思想。
uintSwitch=0xbc95;//开关状态
ucharbdataCoil1=0xff,Coil2=0xbc;//16位线圈状态
sbitCoil1_bit0=Coil1^0;
sbitCoil1_bit1=Coil1^1;
sbitCoil1_bit2=Coil1^2;
sbitCoil1_bit3=Coil1^3;
sbitCoil1_bit4=Coil1^4;
sbitCoil1_bit5=Coil1^5;
sbitCoil1_bit6=Coil1^6;
sbitCoil1_bit7=Coil1^7;
sbitCoil2_bit8=Coil2^0;
sbitCoil2_bit9=Coil2^1;
sbitCoil2_bit10=Coil2^2;
sbitCoil2_bit11=Coil2^3;
sbitCoil2_bit12=Coil2^4;
sbitCoil2_bit13=Coil2^5;
sbitCoil2_bit14=Coil2^6;
sbitCoil2_bit15=Coil2^7;
uintidataReOnlybuf[]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f};
uintidataReWrbuf[]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f};
//CRC校验查表码值
constucharcodeauchCRCHi[]={
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};
constucharcodeauchCRCLo[]={
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};
/********************************************
Function：
CRC校验子函数
Input:
要校验的数组起始地址长度
Output：
16位校验码（高位在前）
********************************************/
uintcrccheck（uchar*puchMsg,ucharusDataLen）
{
ucharuchCRCHi=0xFF;
ucharuchCRCLo=0xFF;
ucharuIndex;
while（usDataLen--）
{
uIndex=uchCRCHi^*puchMsg++;
uchCRCHi=uchCRCLo^auchCRCHi[uIndex];
uchCRCLo=auchCRCLo[uIndex];
}
return（uchCRCHi<<8|uchCRCLo）;
}
/********************************************
Function：
读线圈状态子函数
Input:
无
Output：
无
********************************************/
voidReadCoil（void）
{
uintStartAddress,tempAddress;
ucharCoilNum,i,ByteNum,j;
ucharCoilVal;
bitexit=0;
StartAddress=resvbuf[2];
StartAddress=StartAddress|resvbuf[3];
tempAddress=StartAddress;
CoilNum=resvbuf[5];//读取的位数
ByteNum=CoilNum/8;
if（CoilNum%8!
=0）
ByteNum++;
Sendbuf[2]=ByteNum;//返回的字节数
if（resvbuf[1]==0x01）
{
for（i=0;i{
Sendbuf[i+3]=0;
for（j=0;j<8;j++）
{
CoilVal=GetCoilVal（StartAddress）;
Sendbuf[i+3]|=CoilVal<StartAddress++;
if（StartAddress>=tempAddress+CoilNum）
{
exit=1;
break;
}
}
if（exit==1）
break;
}
}
elseif（resvbuf[1]==0x02）
{
for（i=0;i{
Sendbuf[i+3]=0;
for（j=0;j<8;j++）
{
CoilVal=GetSWVal（StartAddress）;
Sendbuf[i+3]|=CoilVal<StartAddress++;
if（StartAddress>=tempAddress+CoilNum）
{
exit=1;
break;
}
}
if（exit==1）
break;
}
}
SendCount=5+ByteNum;
SendData（）;
}
/********************************************
Function：
读寄存器状态子函数
Input:
无
Output：
无
********************************************/
voidReadRegisters（void）
{
uintStartAddress;
ucharByteCount,i;
StartAddress=resvbuf[2];
StartAddress=StartAddress<<8|resvbuf[3];
ByteCount=resvbuf[5]*2;
Sendbuf[2]=resvbuf[5];
if（resvbuf[1]==0x03）
for（i=0;i{
Sendbuf[i+4]=ReWrbuf[StartAddress]&0xff;
Sendbuf[i+3]=ReWrbuf[StartAddress]>>8;
StartAddress++;
}
elseif（resvbuf[1]==0x04）
for（i=0;i{
Sendbuf[i+4]=ReOnlybuf[StartAddress];
Sendbuf[i+3]=ReOnlybuf[StartAddress];
StartAddress++;
}
SendCount=ByteCount+5;
SendData（）;
}
/********************************************
Function：
强制单线圈子函数
Input:
无
Output：
无
********************************************/
voidForceSingalCoil（void）
{
uintAddress,OnOff;
bittemp,CoilVal;
Address=resvbuf[2]<<8|resvbuf[3];
OnOff=resvbuf[4]<<8|resvbuf[5];
if（OnOff==0x0000）
{
CoilVal=0;
temp=SetCoilVal（Address,CoilVal）;
}
elseif（OnOff==0xFF00）
{
CoilVal=1;
temp=SetCoilVal（Address,CoilVal）;
}
if（temp==1）
{
Sendbuf[2]=resvbuf[2];
Sendbuf[3]=resvbuf[3];
Sendbuf[4]=resvbuf[4];
Sendbuf[5]=resvbuf[5];
SendCount=8;
SendData（）;
}
else
Error=1;
}
/********************************************
Function：
强制单寄存器子函数
Input:
无
Output：
无
********************************************/
voidSetOneRegisterVal（）
{
uintR_Address,RegisterVal;
bittemp1;
R_Address=resvbuf[2];
R_Address=R_Address<<8|resvbuf[3];
RegisterVal=resvbuf[4];
RegisterVal=RegisterVal<<8|resvbuf[5];
temp1=SetRegisterVal（R_Address,RegisterVal）;
if（temp1==1）
{
Sendbuf[2]=resvbuf[2];
Sendbuf[3]=resvbuf[3];
Sendbuf[4]=resvbuf[4];
Sendbuf[5]=resvbuf[5];
SendCount=8;
SendData（）;
}
else
Error=1;
}
/********************************************
Function：
读线圈值子函数
Input:
线圈地址
Output：
线圈的值
********************************************/
ucharGetCoilVal（uintAddress）
{
uintCoilAddress;
ucharCoilVal=0;
CoilAddress=Address;
switch（CoilAddress&0x0f）
{
case0:
CoilVal=Coil1_bit0;break;
case1:
CoilVal=Coil1_bit1;break;
case2:
CoilVal=Coil1_bit2;break;
case3:
CoilVal=Coil1_bit3;break;
case4:
CoilVal=Coil1_bit4;break;
case5:
CoilVal=Coil1_bit5;break;
case6:
CoilVal=Coil1_bit6;break;
case7:
CoilVal=Coil1_bit7;break;
case8:
CoilVal=Coil2_bit8;break;
case9:
CoilVal=Coil2_bit9;break;
case10:
CoilVal=Coil2_bit10;break;
case11:
CoilVal=Coil2_bit11;break;
case12:
CoilVal=Coil2_bit12;break;
case13:
CoilVal=Coil2_bit13;break;
case14:
CoilVal=Coil2_bit14;break;
case15:
CoilVal=Coil2_bit15;break;
default:
break;
}
returnCoilVal;
}
/********************************************
Function：
读开关值子函数
Input:
开关地址
Output：
开关值
********************************************/
ucharGetSWVal（uintAddress1）
{
ucharCoilVal;
ucharSW1,SW2=0xff;
SW1=P2;
Switch=SW2<<8|SW1;
switch（Address1&0x0f）
{
case0:
CoilVal=Switch&0x01;break;
case1:
CoilVal=Switch>>1&0x01;break;
case2:
CoilVal=Switch>>2&0x01;break;
case3:
CoilVal=Switch>>3&0x01;break;
case4:
CoilVal=Switch>>4&0x01;break;
case5:
CoilVal=Switch>>5&0x01;break;
case6:
CoilVal=Switch>>6&0x01;break;
case7:
CoilVal=Switch>>7&0x01;break;
case8:
CoilVal=Switch>>8&0x01;break;
case9:
CoilVal=Switch>>9&0x01;break;
case10:
CoilVal=Switch>>10&0x01;break;
case11:
CoilVal=Switch>>11&0x01;break;
case12:
CoilVal=Switch>>12&0x01;break;
case13:
CoilVal=Switch>>13&0x01;break;
case14:
CoilVal=Switch>>14&0x01;break;
case15:
CoilVal=Switch>>15&0x01;break;
default:
break;
}
returnCoilVal;
}
/********************************************
Function：
强制单线圈值子函数
Input:
线圈地址，强制值
Output：
结果值
********************************************/
bitSetCoilVal（uintAddress,bitVal）
{
bitresult=1;
switch（Address&0x0f）
{
case0:
Coil1_bit0=Val;break;
case1:
Coil1_bit1=Val;break;
case2:
Coil1_bit2=Val;break;
case3:
Coil1_bit3=Val;break;
case4:
Coil1_bit4=Val;break;
case5:
Coil1_bit5=Val;break;
case6:
Coil1_bit6=Val;break;
case7:
Coil1_bit7=Val;break;
case8:
Coil2_
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