modbus.c

基于S51单片机的C源码 对学习S51单片机的同学很有帮助 包含了实验室的和多模块程序

#pragma small //LARGE
#include <absacc.h>
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int

idata uchar in_buff[5],ex_buff[5],r_buff[10],r_ptr,NUM;
idata uint in_value[5],ex_value[5];
idata uchar COM_buff[30],str[5];

data unsigned char T_50ms,T_key,ms_timing,second,second1,second2,up_second,minute,minuter,hour;  //,vent_hour,old_hour,s_hour,old_s_hour;*/
uchar t_count,CRCT,r_in,chint,COM_err;  /*通信用变量*/
bit flag_232C,flag_r,flag_com,flag_up_file;                /*通信用变量*/
sbit lamp=P2^0;
sbit receive=P2^1;
sbit xcs=P3^4;
//display
sbit load=P1^1;  //5; /*0;*/
sbit clk=P1^2;  //6;  /*1;*/
sbit din=P1^0;  //4;
sbit load2=P1^3;

bdata uchar ab;
sbit abit0=ab^0;sbit abit1=ab^1;sbit abit2=ab^2;sbit abit3=ab^3;
sbit abit4=ab^4;sbit abit5=ab^5;sbit abit6=ab^6;sbit abit7=ab^7;

//sbit flag5=P3^3; /*down green*/
/*----------------------------------------------------*/
void rst_wdog(void)
{
xcs=0;
xcs=0;
xcs=1;
}
/*x25045*/

/*----------------------------------------------------*/

/*---------------------------------------------------------*/

unsigned short CRC16(char *puchMsg, uchar usDataLen)
//unsigned char *puchMsg ; /* 要进行CRC校验的消息 */
//unsigned short usDataLen ; /* 消息中字节数 */
{
/* CRC 高位字节值表 */
code unsigned char 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,
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*/
code char auchCRCLo[] = {
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
};
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) ;
}
/*---------------------------------------------------------*/

bit read_a_bit(uchar *str,uchar loc )
{
uchar i,j,*p;
p=str;
i=loc/8; j=loc%8;
p=p+i;
i=*p>>j;
if(i&0x01) return 1; else return 0;
}
/*---------------------------------------------------------*/

void write_a_bit(uchar *str,uchar loc ,bit s)
{
uchar i,j,*p;
p=str;
i=loc/8; j=loc%8;
p=p+i;
i=1<<j;
if(s) *p=*p|i; else{ i=~i; *p=*p&i;}
}
/*---------------------------------------------------------*/

//read internal I/O
void read_in_io(i0,n)
{
uchar i;
bit onebit;
for(i=0;i<n;i++){  //
     onebit=read_a_bit(in_buff,i0+i);
     write_a_bit(str,i,onebit);      //按顺序重排字节 保证上传第一字节第一位为起始bit位
     }
}
/*---------------------------------------------------------*/

//read external I/O
void read_ex_io(i0,n)
{
uchar i;
bit onebit;
for(i=0;i<n;i++){  //
     onebit=read_a_bit(ex_buff,i0+i);
     write_a_bit(str,i,onebit);
     }
}
/*---------------------------------------------------------*/

void send_data(uchar *buff,uchar n);
/*---------------------------------------------------------*/

//check function code
uchar fun_code(uchar *buff,uchar NUM)
{
uchar *p,i0,n,i,s,func_num;
uint crc,v_tmp;
p=buff;
if(*p!=NUM) return 0xff;
p++;
func_num=*p++;
switch(func_num){
    case 1: //read internal I/O
            p++;
            i0=*p++; p++;n=*p;  ///8+1;
            read_in_io(i0,n);
            n=n/8+1;
            buff[2]=n; //字节量
            for(i=0;i<n;i++) buff[i+3]=str[i];
            crc=CRC16(buff,n+3);
            buff[n+3]=crc;
            buff[n+4]=crc>>8;
            break;
    case 2: //read external input I/o
            p++;
            i0=*p++; p++;n=*p;  ///8+1;
            read_ex_io(i0,n);
            n=n/8+1;
            buff[2]=n; //字节量
            for(i=0;i<n;i++) buff[i+3]=str[i];
            crc=CRC16(buff,n+3);
            buff[n+3]=crc;
            buff[n+4]=crc>>8;
            break;

    case 3: //read internal Value (Word)
            p++;
            i0=*p++; p++;n=*p;  ///8+1;
            buff[2]=n*2; //字节数
            p=buff; p+=3;
            for(i=0;i<n;i++){
                  *p=in_value[i0+i]>>8;
                  p++;
                  *p=in_value[i0+i];
                  p++;
                  }
            crc=CRC16(buff,3+2*n);
            buff[3+2*n]=crc;
            buff[4+2*n]=crc>>8;
            break;

    case 4: //read external input Value (Word)
            p++;
            i0=*p++; p++;n=*p;  ///8+1;
            buff[2]=n*2; //字节数
            p=buff; p+=3;
            for(i=0;i<n;i++){
                  *p=ex_value[i0+i]>>8;
                  p++;
                  *p=ex_value[i0+i];
                  p++;
                  }
            crc=CRC16(buff,3+2*n);
            buff[3+2*n]=crc;
            buff[4+2*n]=crc>>8;
            break;

    case 5: //setting One internal I/O
            p++;
            i0=*p++; s=*p;  //s=向下设置的开关状态00/ff;
            write_a_bit(in_buff,i0,s); //写到内部开关量区第i0单元
            break;
    case 6: //setting one internal Value (Word)
            p++;
            i0=*p++;
            v_tmp=(*p<<8)+*(p+1); //取内容
            in_value[i0]=v_tmp;   //存入内部模拟量区
            break;
    case 7: //read internal special coil status (I/O)
    case 8: //test selfly  communation system
    case 15: //setting a group of internal I/O
    case 16: //setting a group of internal Values
    default:
         return 0xfe;
         break;
    }
if(func_num<5)n=buff[2]+3; else n=6;
ES=0;
send_data(buff,n);
ES=1;
return 0;
}
/*----------------------------------------------------------------------*/
void init(void);
/*----------------------------------------------------------------------*/
void initial(void)
{
TMOD=0X21;
TH0=0X3C; TL0=0Xa6;
PT1=1;
ET0=TR0=1;
EA=1;
P1=0xf8;
init();
}
/*---------------------------------------------------------*/
void init(void)
{