MODBUS协议 51端源程序

//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,

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.

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)

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. 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;kgetCoilVal(tempAddr,&tempData);

sendBuf[position] |= tempData << i; tempAddr++;

if(tempAddr >= addr+bitCount) { //读完 exit = 1; break;

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. } }

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;igetRegisterVal(tempAddr,&tempData); sendBuf[i+3] = tempData >> 8; sendBuf[i+4] = tempData & 0xff;

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. }

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);

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. {

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;itempData = (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;

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. beginSend();

}//void presetMultipleRegisters(void) //检查uart0数据

void checkComm0Modbus(void) {

uint16 crcData; uint16 tempData;

if(receCount > 4) {

switch(receBuf[1]) {

case 1://读取线圈状态(读取点 16位以内) case 3://读取保持寄存器(一个或多个) case 5://强制单个线圈 case 6://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;

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. checkoutError = 0; } break;

case 15://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;

case 16://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; }

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. }

}//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:

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. 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;

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. 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;

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. 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:

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. 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;

}//uint8 setRegisterVal(uint16 addr,uint16 data)

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