📄 modbus_51.c
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//modbus部分协议的简单实现（51,C)2006年10月27日 星期五 下午 10:27
//modnus RTU 帧
// 起始 设备地址 功能代码 数据 CRC校验 结束
// 至少3.5T 8BIT 8BIT N个8BIT 16BIT 至少3.5T
//从设备
#include <reg52.h>
#include "KEY_IN.h"
#include "DelayTime.h"
//******************************************************************************
// CRC 16 Data Table
// *****************
const unsigned int code crc_tbl[256]={
0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
0x7800, 0xB8C1, 0xb981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040};
//#pragma end_abs_address
#define Address 1 //地址可以是0到247
sbit KEY_0=P1^4;
sbit KEY_1=P1^5;
sbit KEY_2=P1^6;
sbit KEY_3=P1^7;
sbit KEY_4=P2^3;
sbit KEY_5=P2^1;
sbit KEY_6=P2^0;
sbit KEY_7=P2^5;
#define IN 0 //接收数据
#define OUT3 1 //读寄存器
#define OUT6 2 //写寄存器
#define ERR_OUT 10 //错误输出
//错误代码定义
#define ERR_CRC 1 //CRC校验错
#define ERR_FUNC 2 //功能不支持
#define ERR_OP 3 //操作超出范围
unsigned int buf[10];
unsigned char inData[50];
/******************************************************************************
** 函数名: void Initial(unsigned char bdrate)
** 描述: 串口初始化
** 修改的全局变量:无
** 输入参数: bdrate
** 返回值: 无
*******************************************************************************/
void Initial(unsigned char bdrate)
{
SCON=0x40; // Fosc = 11.0592Mhz
TMOD=0x21; //
PCON=0x80; //
if(bdrate==3) { TH1 =0xFF; TL1 =0xFF;} // 57600
//if(bdrate==2) { TH1 =0xFA; TL1 =0xFA;} // 9600
if(bdrate==2) { TH1 =0xFD; TL1 =0xFD;} // 19200
if(bdrate==1) { TH1 =0xF4; TL1 =0xF4;} // 4800
TR1=1;
ET1=0;
ES=0;
REN=1; //
ES =1;
EA =1;
}
/*
void SendByte(unsigned char Data)
{
SBUF=Data;
while(!TI);
TI=0;
}
*/
unsigned int calccrc(unsigned char IN_OUT,unsigned char* ptr)
{
unsigned char c1, c2;
//unsigned char c2;
unsigned int crc = 0xffff;
// initial value
unsigned char* ptr_pkt_hdr = ptr;
//c2 = MDB_get_length(in_out,ptr);
if(IN_OUT==IN)c2 = 6;
if(IN_OUT==OUT3)c2 = inData[2]+3;
if(IN_OUT==OUT6)c2 = 6;
if(IN_OUT==ERR_OUT)c2 = 5;
for(c1=0; c1<c2; c1++)
crc = ((crc >> 8) & 0xFF) ^ crc_tbl[(crc ^ *ptr_pkt_hdr++) & 0xFF];
return crc;
}
void MD_ERR_DEAL(unsigned char ERR_CODE)
{
unsigned int crc,a;
inData[1]|=0x80;
inData[2]=2;
inData[3]=0;
inData[4]=ERR_CODE;
crc=0xffff;
//for(a=0;a<5;a++)
// calccrc(inData[a]);
crc=calccrc(ERR_OUT,&inData[0]);
inData[6]=crc>>8;
inData[5]=crc&0xff;
for(a=0;a<7;a++)
{
SBUF=inData[a];
while(!TI);
TI=0;
}
}
void Uart0(void) interrupt 4
{
unsigned int a;
unsigned char stop=0;
unsigned char i=0;
unsigned int j=0;
unsigned int uints; //地址
unsigned int uintc; //数量or数据
unsigned int forcrc;
unsigned int crc;
unsigned char wrong=0;
if(RI) //接收中断
{
do
{
j=0;
while(!RI) //
{
j++;
if(j>600)
{
stop=1;
break;
}
}
if(stop==1)
break;
inData[i]=SBUF;
RI=0;
i++;
}
while(i<12); //40个数据
i--;
if(inData[0]!=Address)
return;
uints=(unsigned int)(inData[2]*256+inData[3]);
uintc=(unsigned int)(inData[4]*256+inData[5]);
crc=0xffff;
//for(a=0;a<=i-2;a++)
// calccrc(inData[a]);
crc=calccrc(IN,&inData[0]);
forcrc=(unsigned int)(inData[i]*256+inData[i-1]);
if( (forcrc!=crc) ||( (inData[1]!=3)&&(inData[1]!=6) )
|| (uints>=10) ) //错误处理
{
if(forcrc!=crc)wrong=ERR_CRC;
else if( (inData[1]!=3)&&(inData[1]!=6) ) wrong=ERR_FUNC;
else wrong=ERR_OP;
MD_ERR_DEAL(wrong);
//P1_2=0;
RI=0;
wrong=0;
return;
}
switch(inData[1]) //处理相应的操作
{
case 0x03: // read multiple regs
inData[2]=uintc*2;
if( ( (inData[2])+uints)>20 )
{
MD_ERR_DEAL(ERR_OP);
RI=0;
return;
}
for(a=0;a<uintc;a++)
{
inData[3+a*2]=buf[uints+a]>>8;
inData[4+a*2]=buf[uints+a]&0xff;
}
crc=0xffff;
//for(a=0;a<uintc*2+3;a++)
// calccrc(inData[a]);
crc=calccrc(OUT3,&inData[0]);
inData[uintc*2+4]=crc>>8;
inData[uintc*2+3]=crc&0xff;
// P1_2=1;
for(a=0;a<uintc*2+5;a++)
{
SBUF=inData[a];
while(!TI);
TI=0;
}
// P1_2=0;
break;
case 0x06: // write single regs
buf[uints]=(unsigned int)(inData[4]*256+inData[5]);
crc=0xffff;
crc=calccrc(OUT6,&inData[0]);
inData[7]=(unsigned char)(crc>>8);
inData[6]=(unsigned char)crc;//&0xff;
// P1_2=1;
for(a=0;a<8;a++)
{
SBUF=inData[a];
while(!TI);
TI=0;
}
// P1_2=0;
break;
}
RI=0;
}
}
/*
void MDB_pkt_sender(unsigned char IN_OUT,unsigned char* ptr)
{
unsigned char idx, pkt_len;
unsigned int i1;
// append crc, lsb 1st
i1 = calccrc(IN_OUT,ptr);
pkt_len = 6;
*(ptr+pkt_len++) = (unsigned char)i1; // lsb
*(ptr+pkt_len++) = (i1 >> 8); // msb
for (idx = 0; idx < pkt_len; idx++)
{
SendByte(ptr[idx]);
}
}
*/
void main(void)
{
unsigned char dat;
Initial(1); //22.1184Mhz 9600
while(1)
{
dat=GetKey();
buf[0]=dat;
Delay(2000);
}
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