msp430modbus通信程序

#include "msp430x14x.h" #define uchar unsigned char #define uint unsigned int /****************************************************************************/ #define P3_0_WDI 0x01 //WDT #define P3_1_BEEP 0x02 //蜂鸣 #define P3_2_RTS1 0x04 //RS485A控制 #define P3_3_RTS 0x08 //RS485B控制 #define P5_5_DAT 0x20 //LED DAT BC7281B接口 #define P5_6_KEY 0x40 //LED KEY #define P5_7_CLK 0x80 //LED CLK /****************************************************************************/ uchar CAddress; //仪表地址 uchar Cbps=3,Cbpss=4; uchar Cdata8=0,Cdata8s=0; uchar Cmima[4];//密码 typedef enum { SYS_Idle,//空闲 SYS_Txd,//发送数据 SYS_Twait1,//发送等待 SYS_Twait2, //发送等待 SYS_Rwait,//接收等待 }SYS_STATE; SYS_STATE systemState; uchar Rxok=0; uchar Cflag,Crep=0,Cdscon=0; uint Csearch[16]; uint nHmax[16]; //20mA液位值 uint fXiuZheng[16];//修正系数 uchar CregArry[32];//液位值 uchar Cmnumber=12; uchar Ckey_number; uchar FlashWord[10]; uchar CDispBuff[12]; uint *pq=(uint *)0xfd00;//指向Flash unsigned char aRxBuff0[16]; //接收数据缓冲区 unsigned char NRxBuff0=0; unsigned char aTxBuff0[128]; //发送数据缓冲区 unsigned char NTxBuff0=0; unsigned char commandPending0=0,Ntxd0=0; uint timeoutCounter0=0; uint RXcrc0; uint UstarReg0,UregNum0; uint txwait0; uchar bUartRxErr0; uchar Couttime,Couttime1,CdelayT,CdelayT1; unsigned char aRxBuff1[16]; //接收数据缓冲区 unsigned char NRxBuff1=0; unsigned char aTxBuff1[32]; //发送数据缓冲区 unsigned char NTxBuff1=0; unsigned char commandPending1=0,Ntxd1=0; uint timeoutCounter1=0; uint RXcrc1; uint UstarReg1,UregNum1; uint txwait1; uchar bUartRxErr1; unsigned char *puchMsg ; /* 要进行CRC校验的消息 */ unsigned int CRC16(uchar *puchMsg, uchar usDataLen) { unsigned char uchCRCHi = 0xFF ; /* 高CRC字节初始化 */ unsigned char uchCRCLo = 0xFF ; /* 低CRC 字节初始化 */ unsigned 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) ; } void UpdateStateMachine(void) { static unsigned char CAdesm=1; static unsigned int ia; switch (systemState) { case SYS_Idle: P3OUT|=P3_2_RTS1; aTxBuff1[0]=CAdesm;//地址 aTxBuff1[1]=0x03;//功能代码 aTxBuff1[2]=0x00;//起始地址 aTxBuff1[3]=0x00;//起始地址 aTxBuff1[4]=0x00;//寄存器个数 aTxBuff1[5]=0x01;//寄存器个数 puchMsg=aTxBuff1; RXcrc1=CRC16(puchMsg, 6);//字符串校验 aTxBuff1[6]=RXcrc1>>8;//功能代码 aTxBuff1[7]=RXcrc1&0x00ff; NTxBuff1=0; systemState=SYS_Txd; break; case SYS_Txd: if (NTxBuff1<8) { TXBUF1=aTxBuff1[NTxBuff1]; NTxBuff1++; systemState=SYS_Twait1; } else { ia=0; systemState=SYS_Twait2; } break; case SYS_Twait1: if (IFG2&UTXIFG1)//查询是否发送完毕 { systemState=SYS_Txd; } break; case SYS_Twait2: ia++; if (ia>=CdelayT1) { CAdesm++; if (CAdesm>Cmnumber) CAdesm=1; systemState=SYS_Rwait; P3OUT&=~P3_2_RTS1; Rxok=0; ia=0; } break; case SYS_Rwait: ia++; if ((ia>=2500)||((Rxok==1)&&(ia>=80))) { systemState=SYS_Idle; } break; default : systemState=SYS_Idle; break; } } void HandleUART0(void) { uint i; if (NRxBuff0>0) { if(timeoutCounter0++ > Couttime)//接收超时 { NRxBuff0=0; for (i=0;i<10;i++) { aRxBuff0[i]=0; } } } else { timeoutCounter0 = 0;// Don't let timeoutCounter slowly grow over many commands. } if (commandPending0 == 0)//收态 { if (NRxBuff0>=8) { if ((aRxBuff0[3]==0x04)&&(aRxBuff0[1]==0x06)) { if (NRxBuff0>=10) { puchMsg=aRxBuff0; RXcrc0=CRC16(puchMsg, NRxBuff0-2);//字符串校验 i=aRxBuff0[NRxBuff0-2]*0x100+aRxBuff0[NRxBuff0-1]; NRxBuff0=0; if (RXcrc0==i)//通过CRC校验 { if (aRxBuff0[0]==CAddress) { commandPending0 = 1; } } } } else { puchMsg=aRxBuff0; RXcrc0=CRC16(puchMsg, NRxBuff0-2);//字符串校验 i=aRxBuff0[NRxBuff0-2]*0x100+aRxBuff0[NRxBuff0-1]; NRxBuff0=0; if (RXcrc0==i)//通过CRC校验 { if (aRxBuff0[0]==CAddress) { commandPending0 = 1; } } else { commandPending0 = 0; NRxBuff0=0; for (i=0;i<10;i++) { aRxBuff0[i]=0; } } } } } else if (commandPending0 == 1)//命令处理 { switch(aRxBuff0[1]) { case 3: UstarReg0=aRxBuff0[2]*0x100+aRxBuff0[3]; UregNum0=(aRxBuff0[4]*0x100+aRxBuff0[5])<<1; aTxBuff0[0]=CAddress;//地址 aTxBuff0[1]=0x03;//功能代码 aTxBuff0[2]=UregNum0; for (i=0;i<UregNum0;i++) { aTxBuff0[i+3]=CregArry[(UstarReg0<<1)+i]; } puchMsg=aTxBuff0; RXcrc0=CRC16(puchMsg, UregNum0+3);//CRC计算 aTxBuff0[UregNum0+3]=(RXcrc0&0xff00)>>8; //CRC高字节 aTxBuff0[UregNum0+4]=RXcrc0&0x00ff;//CRC低字节 P3OUT|=P3_3_RTS; Ntxd0=UregNum0+5; NTxBuff0=0; commandPending0 = 2; //SendUart0(UregNum+5);//发送 break; case 6: UstarReg0=aRxBuff0[2]*0x100+aRxBuff0[3]; switch(UstarReg0) { case 0://初值 break; case 1://地址 break; case 2://20mA break; case 3://调相 break; case 4://修正系数 break; default : break; } commandPending0 = 0; break; default : commandPending0 = 0; break; }//功能 } else if (commandPending0 == 2)//发态 { TXBUF0=aTxBuff0[NTxBuff0]; NTxBuff0++; if (NTxBuff0>=Ntxd0) { commandPending0 = 4; txwait0=CdelayT; } else { commandPending0 = 3; } } else if(commandPending0 == 3)//发送等待状态 { if (IFG1&UTXIFG0)//查询是否发送完毕 { commandPending0 =2; } } else if(commandPending0 == 4) { if(--txwait0 == 0) { commandPending0 = 0; P3OUT&=~P3_3_RTS; } } } void HandleUART1(void) { uint i; if (NRxBuff1>0) { if(timeoutCounter1++ > Couttime1)//接收超时 { NRxBuff1=0; for (i=0;i<10;i++) { aRxBuff1[i]=0; } } } else { timeoutCounter1 = 0;// Don't let timeoutCounter slowly grow over many commands. } if (commandPending1 == 0)//收态 { if (NRxBuff1>=7) { puchMsg=aRxBuff1; RXcrc1=CRC16(puchMsg, NRxBuff1-2);//字符串校验 i=aRxBuff1[NRxBuff1-2]*0x100+aRxBuff1[NRxBuff1-1]; NRxBuff1=0; if (RXcrc1==i)//通过CRC校验 { commandPending1 = 1; } else { commandPend