📄 modbus.c
字号:
uchar xdata ModBus10Addr;
uchar xdata ModBus10Lenth;
/* CRC 高位字节值表
uchar code CRCHi[] = {
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
uchar code CRCLo[] = {
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
};*/
void CommInitial(void);//通信初始化
void CRC16(uchar);//CRC16校验
void Receive(void);//接收控制程序
void RxInitial(void);//接收初始化
void ReceiveSlaveAddr(void);//接收仪表地址
void ReceiveCommand(void);//接收命令字
void ReceiveAddr(void);//接收数据起始地址
void ReceiveLenth(void);//接收数据长度huo寄存器数量
void ReceiveByteLenth(void);//接收字节长度
void ReceiveData(void);//接收数据
void ReceiveCRC(void);//接收校验
void Trans(void);//发送控制程序
void TxInitial(void);//发送初始化
void TransSlaveAddr(void);//发送仪表地址
void TransCommand(void);//发送命令字
void TransAddr(void);//起始地址
void TransLenth(void);//寄存器数量
void TransCount(void);//发送字节数
void TransData(void);//发送数据
void TransCRC(void);//发送校验码
void ReceiveISPCommand();
void RecDataTimer(void);
/*
仪表通信协议：MODEBUS-RTU
ModBus功能码
01 读取线圈状态 取得一组逻辑线圈的当前状态（ON/OFF)
02 读取输入状态 取得一组开关输入的当前状态（ON/OFF)
03 读取保持寄存器 在一个或多个保持寄存器中取得当前的二进制值
04 读取输入寄存器 在一个或多个输入寄存器中取得当前的二进制值
16 预置多寄存器 把具体的二进制值装入一串连续的保持寄存器
65～72 保留以备用户功能所用 留作用户功能的扩展编码
*每个寄存器占1个字
*/
void Serial_ISR(void) interrupt 4 //串口中断
{
if(RI)
{
RI = 0;
Receive();
return;
}
if(TI)
{
TI = 0;
Trans();
return;
}
}
void CommInitial(void)
{
ES = 0;
ET1 = 0;
//T2CON = 0x34;//定时器T2为波特率产生器
//TMOD=TMOD|0x20;
SCON |= 0x50;//串行口工作方式1，接收控制允许；
//PCON = 0x80;//baud add time 'SMOD
switch (EE1[EE_BAUD+1]) //EE1菜单
{
case DISP_1200 :
TH1=0xe8;
TL1=0xe8;
break;
case DISP_2400 :
TH1=0xf4;
TL1=0xf4;
break;
case DISP_4800 :
TH1=0xfa;
TL1=0xfa;
break;
case DISP_9600 :
TH1=0xfd;
TL1=0xfd;
break;
default:
break;
}
RxInitial();
TR1=1;
PS=1;
ModBus10=0;
ES = 1;
}
void RxInitial(void)
{
RTE = 0; //MAX1487处于接收状态
RI = 0;
crc = 0xffff;
CommPointer = 0; //通信散转指针
Comm_Flag = 0; //接受高低字节标记 0高，1低
Rx_Pointer = Rx;//接收缓冲区
*(Rx_Pointer + Rx_DataCtr) = 0;
Tx_Pointer = Comm;//Varible;//变量首址
Receive10=0; //10接受数据
}
void CRC16(uchar m)
{
/*uchar i;
uchar j;
uchar code * data p;
j = crc;
i = crc >> 8;//低位
m = m ^ j; //加校验码数M异货0XFFFF
p = CRCHi;
j = i ^ *(p + m);//获得低位校验
p = CRCLo;
i = *(p + m);//获得高位校验
crc = i << 8 | j;*/
char i;
crc=crc^(uint)m;
for(i=0;i<8;i++)
{
if (crc%2)
{
crc=crc/2;
crc=crc^0xa001;
}
else
crc=crc/2;
}
}
////////////////////////////////////////////////
void Receive(void)
{
switch(CommPointer)
{
case 0:
ReceiveSlaveAddr();
break;
case 1:
ReceiveCommand();
break;
case 2:
ReceiveAddr();
break;
case 3:
ReceiveLenth();//寄存器数量
break;
case 4:
ReceiveByteLenth();//10
break;
case 5:
ReceiveData();//10
break;
case 6:
ReceiveCRC();
break;
default :
break;
}
}
void ReceiveSlaveAddr(void)
{
*(Rx_Pointer + Rx_Addr) = SBUF;//指向接收数据指针+RX_ADDR
if(*(Rx_Pointer + Rx_Addr) != EE1[EE_ADDR+1])//接受地址不等仪表地址
{
RxInitial();
return;
}
CRC16(*(Rx_Pointer + Rx_Addr));
//CRC16(SBUF);
CommPointer++;
}
void ReceiveCommand(void)
{
*(Rx_Pointer + Rx_Cmd) = SBUF;
switch(*(Rx_Pointer + Rx_Cmd))
{
case 3: ////读取保持寄存器
//CRC16(*(Rx_Pointer + Rx_Cmd));
CRC16(SBUF);
Comm_Flag = 0;
CommPointer++;
//ModBus10=0;
break;
case 0x10://16: ////写保持寄存器
//CRC16(*(Rx_Pointer + Rx_Cmd));
CRC16(SBUF);
Comm_Flag = 0;
CommPointer++;
//ModBus10=1;
break;
/* case 65:
CRC16(*(Rx_Pointer + Rx_Cmd));
Comm_Flag = 0;
CommPointer++;
break;
case 72: //0x48
CRC16(Rx[Rx_Cmd]);
Comm_Flag = 0;
CommPointer =4;
break;*/
default :
RxInitial();
break;
}
}
void ReceiveAddr(void)
{
if(Comm_Flag == 0)//高字节
{
*(Rx_Pointer + Rx_AddrH) = SBUF;
//CRC16(*(Rx_Pointer + Rx_AddrH));
CRC16(SBUF);
Comm_Flag = 1;
return;
}
*(Rx_Pointer + Rx_AddrL) = SBUF;
ModBus10Addr= SBUF;
if(*(Rx_Pointer + Rx_Cmd)==3)
Tx_Pointer += *(Rx_Pointer + Rx_AddrH)<<8 | *(Rx_Pointer + Rx_AddrL);//地址送发送指针
//CRC16(*(Rx_Pointer + Rx_AddrL));
CRC16(SBUF);
CommPointer++;
Comm_Flag = 0;
}
void ReceiveLenth(void)
{
if(Comm_Flag == 0)///高字节
{
*(Rx_Pointer + Rx_LenthH) = SBUF;
//CRC16(*(Rx_Pointer + Rx_LenthH));
CRC16(SBUF);
Comm_Flag = 1;
return;
}
*(Rx_Pointer + Rx_LenthL) = SBUF;
ModBus10Lenth= SBUF;
if(*(Rx_Pointer + Rx_Cmd)==3)
*(Rx_Pointer + Rx_DataCtr) = *(Rx_Pointer + Rx_LenthL) << 1;//寄存器字节数
//CRC16(*(Rx_Pointer + Rx_LenthL));
CRC16(SBUF);
if(*(Rx_Pointer + Rx_Cmd)==16)
{
CommPointer++;
}
else
{ CommPointer=6;}
Comm_Flag = 0;
}
void ReceiveByteLenth(void)//字节数
{
*(Rx_Pointer + 6) = SBUF;
//ModBus10Byte= SBUF;
CRC16(*(Rx_Pointer + 6));
//CRC16(SBUF);
CommPointer++;
}
void ReceiveData(void)
{
//char idata k;
//k=SBUF;
if(Comm_Flag == 0)///高字节
{
*(Rx_Pointer + (*(Rx_Pointer + Rx_AddrL)*2) + Receive10 ) = SBUF;
//CRC16(*(Rx_Pointer + *(Rx_Pointer + Rx_AddrL) + Receive10));
CRC16(SBUF);
Comm_Flag = 1;
Receive10++;
return;
}
//else
//{
*(Rx_Pointer + (*(Rx_Pointer + Rx_AddrL)*2) + Receive10) = SBUF;
//CRC16(*(Rx_Pointer + *(Rx_Pointer + Rx_AddrL) + Receive10));
CRC16(SBUF);
Comm_Flag = 0;
Receive10++;
//}
if( Receive10 == *(Rx_Pointer + 6))//
{
CommPointer++;
Comm_Flag = 0;
Receive10=0;
//ModBus10=1;//写标记
}
}
void ReceiveCRC(void)
{
uchar i;
uchar j;
if(Comm_Flag == 0)
{
i = SBUF;
j = crc;
if(i != j)
{
RxInitial();
return;
}
Comm_Flag = 1;
return;
}
i = SBUF;
j = crc >> 8;
if(i != j)
{
RxInitial();
return;
}
CommPointer = 0;
Comm_Flag = 0;
RTE = 1;//发射
crc = 0xffff;
TxInitial();
}
void TxInitial(void)
{
Trans();
}
void Trans(void)
{
switch(CommPointer)
{
case 0:
TransSlaveAddr();
break;
case 1:
TransCommand();
break;
case 2:
TransCount(); ///字节数03H
break;
case 3:
TransData();//03H
break;
case 4:
TransAddr();//起始地址10H
break;
case 5:
TransLenth();//寄存器数量10H
break;
case 6:
TransCRC();
break;
case 7:
RxInitial();
break;
default:break;
}
}
void TransSlaveAddr(void)
{
SBUF = *(Rx_Pointer + Rx_Addr);
CRC16(*(Rx_Pointer + Rx_Addr));
CommPointer++;
}
void TransCommand(void)
{
SBUF = *(Rx_Pointer + Rx_Cmd);
CRC16(*(Rx_Pointer + Rx_Cmd));
switch(*(Rx_Pointer + Rx_Cmd))
{
case 3:
CommPointer++;
break;
case 0x10://16
CommPointer=4;
Comm_Flag = 0;
break;
/*case 65:
CommPointer = 4;
Comm_Flag = 0;
break;*/
/* case 72:
CommPointer = 4;
Comm_Flag = 0;
break;
*/ default:
break;
}
}
void TransCount(void)
{
SBUF = *(Rx_Pointer + Rx_DataCtr);//接受的数据字节数
CRC16(*(Rx_Pointer + Rx_DataCtr));
CommPointer++;
Comm_Flag = 0;
}
//数据发送，先高字节，后低字节
void TransData()
{
uchar i;
if(Comm_Flag == 0)//高字节
{
i = *Tx_Pointer >> 8;
SBUF = i;
CRC16(i);
Comm_Flag = 1;
return;
}
i = *Tx_Pointer;
SBUF = i;
CRC16(i);
Tx_Pointer++;
Comm_Flag = 0;
*(Rx_Pointer + Rx_DataCtr) -= 2;
if(*(Rx_Pointer + Rx_DataCtr) <= 0)
{
CommPointer=6;
Comm_Flag = 0;
}
}
void TransAddr(void)
{
if(Comm_Flag == 0)//高字节
{
SBUF = *(Rx_Pointer + Rx_AddrH);
CRC16(*(Rx_Pointer + Rx_AddrH));
Comm_Flag = 1;
return;
}
SBUF = *(Rx_Pointer + Rx_AddrL);
CRC16(*(Rx_Pointer + Rx_AddrL));
Comm_Flag = 0;
CommPointer++;
}
void TransLenth(void)
{
if(Comm_Flag == 0)//高字节
{
SBUF = *(Rx_Pointer + Rx_LenthH);
CRC16(*(Rx_Pointer + Rx_LenthH));
Comm_Flag = 1;
return;
}
SBUF = *(Rx_Pointer + Rx_LenthL);
CRC16(*(Rx_Pointer + Rx_LenthL));
Comm_Flag = 0;
CommPointer++;
//ModBus10=1;//写标记
}
void TransCRC(void)
{
if(Comm_Flag == 0)
{
SBUF = crc;
Comm_Flag = 1;
return;
}
SBUF = crc>>8;
if(*(Rx_Pointer + Rx_Cmd)==16)
{
ModBus10=1;//写标记
}
CommPointer++;
//ModBus10=1;//写标记
}
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -