基于51单片机的modbus rtu 通信测试程序

#include <reg52.h> #include <INTRINS.H> #include <STCHeader.h> /*********************************************************************************/ //modbus通信相关宏定义 /*********************************************************************************/ #define MAX_PACKET 14 //串口缓冲区大小 #define MAX_ADDR_NUM 48 //最大从机地址数量 #define FUNC_NUM_ERR 0x01 //错误码 #define REG_ADDR_ERR 0x02 #define REG_NUM_ERR 0x03 #define MY_ADDR 0x01 //modbus从机地址 #define OSFREQ 11059200 //晶振频率11.0592MHz char idata DI[6]={0x01,0x02,0x03,0x04,0x05,0x06}; //数字量输入数据 char idata DO[6]={0x06,0x07,0x08,0x09,0x10,0x11}; //数字量输出数据 char idata AI[8]={0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18}; //模拟量输入数据 char idata AO[8]={0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18}; //模拟量输出数据 char idata ReceiveData[MAX_PACKET]; //串口接收数据缓冲区，14字节大小 unsigned char sendbuf[MAX_PACKET]; //串口发送数据缓冲区，14字节大小 VOID SendStringToCom(UCHAR *pStrToSend,UINT sendLength); //串口发送函数，发送指定长度的字符串 /*--------------------------------------------------------------------------- 函数说明：CRC 高位字节值表 ---------------------------------------------------------------------------*/ static unsigned char code Cal_CRC_Hi[] = { 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 } ; /*--------------------------------------------------------------------------- 函数说明：CRC低位字节值表 ---------------------------------------------------------------------------*/ static unsigned char code Cal_CRC_Lo[] = { 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 }; /*--------------------------------------------------------------------------- 函数名称：Cal_CRC16 函数说明：modbus rtu通信的CRC校验 ---------------------------------------------------------------------------*/ static unsigned int Cal_CRC16(unsigned char *puchMsg, unsigned char usDataLen) { unsigned char uchCRCHi = 0xFF ; // 高CRC字节初始化 unsigned char uchCRCLo = 0xFF ; // 低CRC 字节初始化 unsigned int 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 ^ Cal_CRC_Hi[uIndex] ; uchCRCLo = Cal_CRC_Lo[uIndex] ; } return (uchCRCHi << 8 | uchCRCLo) ; } /*--------------------------------------------------------------------------- 函数名称：GetBit 函数说明：取出所给地址的位值 ---------------------------------------------------------------------------*/ static unsigned char GetBit(unsigned int address,unsigned char function) { unsigned char data Offset; unsigned char data temp; unsigned char data *Myaddress; Offset=(char)address&0x07; //求余，该位在对应数组元素中的偏移位置 switch (function) //根据功能码不同进行相应处理 { case 2: Myaddress=DI; break; case 1: Myaddress=DO; break; default: return 2; } temp=(char)(address>>3); //得到bit位在数组中的索引地址 temp=*(Myaddress+temp); //得到该数组中该字节的数值 temp>>=(Offset); //右移得到对应位的值 if (temp&0x01) return 1; else return 0; } /*--------------------------------------------------------------------------- 函数名称：ProcessFun1_2 函数说明：功能码1，2处理 ---------------------------------------------------------------------------*/ static void ProcessFun1_2(unsigned char address, unsigned char len) { unsigned char i; unsigned char j; unsigned char length; unsigned char function; unsigned int temp; length=0; sendbuf[0]=ReceiveData[0]; //地址 sendbuf[1]=ReceiveData[1]; //功能码 function=sendbuf[1]; for (i=1;i<=len;i++) { length++; sendbuf[2+length]=0; //清零 for (j=0;j<8;j++) { sendbuf[2+length]=sendbuf[2+length]|(GetBit(address,function)<<j); address++; i++; if(i>len)break; } i--; } sendbuf[2]=length; //数据长度 temp=Cal_CRC16(sendbuf,length+3); //DI状态数据 sendbuf[3+length]=(char)(temp>>8); //CRC校验高 sendbuf[4+length]=(char)temp; //CRC校验低 SendStringToCom(sendbuf,length+5); //调用串口发送程序 } /*--------------------------------------------------------------------------- 函数名称：ProcessFun3 函数说明：功能码3处理-----读取多个保持寄存器 ---------------------------------------------------------------------------*/ static void ProcessFun3(unsigned char address, unsigned char len) {