STM32单片机的MODBUS通讯器毕业论文 - 图文(13)

35

基于单片机的MODBUS通讯器设计

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 };

u16 CRC16(u8 *puckMsg,u8 usDataLen)//CRC16查表计算函数 { }

36

u8 uchCRCHi = 0xFF ; /* 高CRC字节初始化 */ u8 uchCRCLo = 0xFF ; /* 低CRC 字节初始化 */ u32 uIndex ; /* CRC循环中的索引 */ while (usDataLen--) /* 传输消息缓冲区 */ { }

return (uchCRCLo << 8 |uchCRCHi) ; //高位在前

uIndex = uchCRCHi ^ *puckMsg++ ; /* 计算CRC */ uchCRCHi = uchCRCLo ^ AuchCRCHi[uIndex] ; uchCRCLo = AuchCRCLo[uIndex] ;

基于单片机的MODBUS通讯器设计

void Begin_Send() {

TxCounter1 = 0; }

//主机MODBUS程序

void ReadSlaveMCUData(u8 saddr,u8 fuctionnum,u16 startaddr,u16 count) {

u16 CRCData;

USARTSendBuff[0]=saddr;//从机地址 USARTSendBuff[1]=fuctionnum;//功能码 USARTSendBuff[2]=startaddr/256;//从机地址高 USARTSendBuff[3]=startaddr%6;//从机地址低 USARTSendBuff[4]=count/256;//读字节数高 USARTSendBuff[5]=count%6;//读取字节数低 CRCData=CRC16(USARTSendBuff,6);//返回CRC校验 USARTSendBuff[6]=(u8)CRCData;

USARTSendBuff[7]=(u8)(CRCData>>8);//加入CRC校验 SendByteNum=8; //送入要发送的字节数 //Send_Buf=TxBuffer1;

USART_SendData(USART1, USARTSendBuff[TxCounter1]); TxCounter1++;

Begin_Send(); }

37

基于单片机的MODBUS通讯器设计

附录6 从机通讯程序代码 #include #include \.h\#include\

unsigned char xdata receBuf[16]={0x01,0x01,10,11,12,13,14,9}; unsigned char xdata sendBuf[16]; unsigned int bdata s_bit;

unsigned char idata checkoutError;//用于偶校验； unsigned char idata receTimeOut=0;//接收超时 unsigned char testCoil; //用于测试 位地址1 bit b232Send;

unsigned int testRegister; //用于测试 字址址16 unsigned char localAddr = 2; //单片机控制板的地址 unsigned char sendCount; //发送字节个数 unsigned char receCount; //接收到的字节个数 unsigned char sendPosi; //发送位置 unsigned int get_Reg(unsigned int m);

void set_Reg(unsigned int m,unsigned int tempData); void set_Coi(unsigned int m,unsigned int s); unsigned int get_Coi(unsigned int m); extern unsigned int xdata Data_tab[20]; /* CRC 高位字节值表 */

const unsigned char 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,

38