STC 51单片机串口通信

#include "STC12C.H" #include <string.h> #include <stdlib.h> #include <stdio.h> #include "EEPROM.H" #include <intrins.h> sbit In1 = P2^7; sbit In2 = P2^6; sbit In3 = P2^5; sbit In7 = P2^2; sbit In8 = P2^3; sbit In9 = P2^4; sbit In4 = P1^4; sbit In5 = P1^3; sbit In6 = P1^2; //#define ADDRESS (P4&0x0f) #define FOSC 11059200L //11059200L #define T1ms (FOSC/24) #define uint unsigned int void UART_INIT() { SCON = 0x50; // uart 模式1 (8 bit), REN=1； TMOD = TMOD | 0x20 ; // 定时器1 模式2； TH1 = 0xFD; // 9600 Bds at 11.059MHz TL1 = 0xFD; ES = 1; //允许uart中断； EA = 1; //允许CPU中断； TR1 = 1; //运行定时器1： } unsigned int idata value; //unsigned int uart_count=0; unsigned char send_count=0; unsigned char xdata recive_buf[30]; unsigned char xdata send_buf[30]; //unsigned char recive_stat=0; unsigned char idata recive_num=0; unsigned char idata send_num=0; unsigned char IRAdd=0; void serial_IT(void) interrupt 4 { if (RI == 1) //如果是接收； { RI = 0; //清接收标志以便可以接收下一个数据； if(recive_num<30) recive_buf[recive_num++]=SBUF; } else if(TI) //如果是发送； { if(send_num>0) { SBUF = send_buf[send_count++]; send_num--; if(send_num==0) { send_count=0; } } else { //EN485 =0; } TI = 0; //清发送标志； } } void init_timer0(void)//定时器0中断初始化； { TMOD &= 0xF0; //定时器0模式2软件启动； TMOD |= 0x01; /* GATE0=0; C/T0#=0; M10=1; M00=0; */ TL0 = 0x00; //初始值； //5ms @ 22.1184MHz TH0 = 0xee; //重装值 ET0=1; //允许定时器0中断； EA=1; //允许CPU中断； TR0=1; //启动定时器0； } unsigned int second_count=0; unsigned int delay_count=0; void it_timer0(void) interrupt 1 //定时中断； { //char i; TL0 = 0x00; //初始值； //5ms @ 11.0592MHz TH0 = 0xee; //重装值 second_count++; delay_count++; } uint crc16(unsigned char *puchMsg, unsigned int usDataLen); unsigned int mycrc16(unsigned char *puchMsg, unsigned int usDataLen); void beginsend(void); bit check_modbus(void); /* void PCA_init() { unsigned int value; CCON =0; CL =0; CH =0; CMOD =0x00; //系统时钟，Fosc/12 value=T1ms; CCAP0L= value; CCAP0H= value>>8; value +=T1ms; CCAPM0 =0x49; //16位软件定时器 CR=0; //启动计数器 EA=1; } void PCA_isr() interrupt 7 using 1//大概5ms处理一次 { CCF0=0; CR=0; // receive_count=0; } *//* void InitADC() { P1ASF = 0xC0; //开启AD4、AD5 ADC_RES =0; ADC_CONTR = ADC_POWER|ADC_SPEEDLL; } */ void delay(unsigned int t) { unsigned int tt=1800; while(t--); while(tt--&&recive_num>8); } unsigned char IntFromStr(char *s)//3a { unsigned char a=0,b=0; a =s[0]>='A'? 10+(s[0]-'A'):s[0]-'0'; b =s[1]>='A'? 10+(s[1]-'A'):s[1]-'0'; return a*16+b; } unsigned int send_time=0; unsigned char work_mod='0'; unsigned char Str_to_int(char s[]); unsigned char num[8]; //用于保存按键对应的数码管值 void main() { unsigned int second =0; unsigned char *p; unsigned char temp[6]; unsigned int crc_temp; unsigned int jiami=0; { UART_INIT(); init_timer0(); read_eeprom_code(); while(1) { if(recive_num>0) { delay(5000); if(!check_modbus()) if(IRAdd==IntFromStr(recive_buf)) { send_buf[0]=recive_buf[0]; send_buf[1]=recive_buf[1]; if(recive_buf[2]=='G' && recive_buf[3]=='I' && recive_buf[4]=='O' ) //获取状态 { send_buf[0]= recive_buf[0]; send_buf[1]= recive_buf[1]; send_buf[2]= 'I'; send_buf[3]= 'O'; send_buf[4]= '='; memset(&send_buf[5],'0',9); if(In1) send_buf[5]= '1'; if(In2) send_buf[6]= '1'; if(In3) send_buf[7]= '1'; if(In4) send_buf[8]= '1'; if(In5) send_buf[9]= '1'; if(In6) send_buf[10]= '1'; if(In7) send_buf[11]= '1'; if(In8) send_buf[12]= '1'; if(In9) send_buf[13]= '1'; send_num = 14; beginsend(); } } recive_num=0; } } } } /* unsigned char Str_to_int(char s[]) //二进制字符转为10进制数 { unsigned char i=0,j=0,m=1,sum=0; for(i=8;i>0;i--) { for(j=0;j<8-i;j++) {m=2*m;} sum=sum+(s[i-1]-0x30)*m; m=1; } return sum; } */ void beginsend(void) { send_count=0; //led=0; //EN485 =1; TI=1; } void com_error(unsigned char *p) { unsigned int crc; p[1]=p[1]+0x80; memcpy(send_buf,p,6); crc=crc16(send_buf,6); send_buf[6]=crc>>8; send_buf[7]=crc&0xff; send_num=8; beginsend(); } int response_io_status( int address, int nb, unsigned char *response, int offset) { int shift = 0; int byte = 0; int i; unsigned char io_status[9]; memset(io_status, 0, 9); if(In1) io_status[0] =0x01; if(In2) io_status[1] =0x01; if(In3) io_status[2] =0x01; if(In4) io_status[3] =0x01; if(In5) io_status[4] =0x01; if(In6) io_status[5] =0x01; if(In7) io_status[6] =0x01; if(In8) io_status[7] =0x01; if(In9) io_status[8] =0x01; for (i = address; i <address+ nb; i++) { byte |= io_status[i] << shift; if (shift == 7) { /* Byte is full */ response[offset++] = byte; byte = shift = 0; } else { shift++; } } if (shift != 0) response[offset++] = byte; return offset; } unsigned char get_io_num() { unsigned char num=9; if(In1) num--; if(In2) num--; if(In3) num--; if(In4) num--; if(In5) num--; if(In6) num--; if(In7) num--; if(In8) num--; if(In9) num--; return num; } bit check_modbus(void) { unsigned int crc=0; unsigned char CRCH,CRCL; // 0f 04 07 cf 00 01 01 af if( recive_num==8)////////////////////address 03 00 00 00 01 crc crc { crc=crc16(recive_buf,6); CRCH =crc>>8; CRCL =crc&0xff; if(recive_buf[6]==CRCH&&recive_buf[7]==CRCL) if(recive_buf[0]==IRAdd)// &&(crc==((a[7]+(a[6]<<8)))) { if(recive_buf[1]==0x01) { unsigned int aa=recive_buf[2]*256+recive_buf[3]; unsigned char len =recive_buf[4]*256+recive_buf[5]; if(aa<1999) return 0; send_buf[0]=recive_buf[0];//设备地址 send_buf[1]=recive_buf[1];//功能码 if(len<9) { send_buf[2]=1; response_io_status(aa-1999, len, send_buf, 3); crc=crc16(send_buf,4); send_buf[4]=crc>>8; send_buf[5]=crc&0xff; send_num=6; } else { send_buf[2]=2; response_io_status( aa-1999, len, send_buf, 3); crc=crc16(send_buf,5); send_buf[5]=crc>>8; send_buf[6]=crc&