C语言编写modbus协议.docx

1、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 */ 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,

2、 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,

3、 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,

4、 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,

5、 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,

6、 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, 0x

7、0C, 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, 0x

8、F1, 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, 0x

9、E7, 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, 0x

10、BA, 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, 0x

11、9A, 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 1uint16 testRegister; /用于测试 字址址 16uint8 lo

12、calAddr = 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 =

13、uchCRCHi *puchMsg+ ; /* 计算 CRC */ uchCRCHi = uchCRCLo auchCRCHiuIndex ; uchCRCLo = auchCRCLouIndex ; return (uchCRCHi 1)sendCount-;ACC = sendBuf0;TB8 = P;SBUF = sendBuf0;/void beginSend(void)/读线圈状态void readCoil(void)uint8 addr;uint8 tempAddr;uint8 byteCount;uint8 bitCount;uint16 crcData;uint8 positi

14、on;uint8 i,k;uint8 result;uint16 tempData;uint8 exit = 0;/addr = (receBuf2= addr+bitCount)if(tempAddr = addr+bitCount) /读完exit = 1;break; if(exit = 1)break;sendBuf0 = localAddr;sendBuf1 = 0x01; sendBuf2 = byteCount;byteCount += 3;crcData = crc16(sendBuf,byteCount); sendBufbyteCount = crcData 8;byteC

15、ount+;sendBufbyteCount = crcData 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 = (receBuf2 8; sendBufi+4 = tempD

16、ata sendBuf0 = localAddr;sendBuf1 = 3;sendBuf2 = byteCount;byteCount += 3;crcData = crc16(sendBuf,byteCount);sendBufbyteCount = crcData 8;byteCount+;sendBufbyteCount = crcData sendCount = byteCount + 1;beginSend();/void readRegisters(void)/强制单个线圈void forceSingleCoil(void)uint8 addr;uint8 tempAddr;ui

17、nt16 tempData;uint8 onOff;uint8 i;/addr = (receBuf2 8;sendBuf3 = addr sendBuf4 = setCount 8;sendBuf5 = setCount crcData = crc16(sendBuf,6);sendBuf6 = crcData 8;sendBuf7 = crcData sendCount = 8;beginSend(); /void presetMultipleRegisters(void)/检查 uart0 数据void checkComm0Modbus(void)uint16 crcData;uint1

18、6 tempData;if(receCount 4)switch(receBuf1)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(receBuf0=localAddr if(crcData = receBuf7+(receBuf6= tempData)if(receBuf0=localAddr if(crcData = (receBuftempData-2= tempData)if(receBuf0=localA

19、ddr if(crcData = (receBuftempData-28)+ receBuftempData-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 /只取低 8 位地址switch(tempAddr ca

20、se 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 switch(tempAddr case 1: testCoil = tempData;break;case 2: break; case 3:break;