STC11F04 MCU serial terminal program

A serial terminal program made with STC11F04 microcontroller. Similar to the telnet command of the switch.

Due to time constraints, only a few simple commands were implemented.

 help
LED1_ON
LED1_OFF
LED2_ON
LED2_OFF

For example, enter in the serial terminal? 

Enter the Time command to query the current time inside the microcontroller.

Input LED1_ON to light up LED1 on the board

Input LED1_OFF to turn off LED1 on the board

If the command you enter is not the one above, an error message will be displayed.

In general, the above functions have been realized so far. Interested friends can add some more commands by themselves.

The entire source code is as follows:

#include "reg51.h"
#include "stdio.h"
#include "intrins.h" //_nop_()
#include "string.h"

unsigned int tick;

int hh,mm,ss; //Hour: minute: second
sbit LED1=P1^0;
sbit LED2=P3^7;

unsigned char cmd_buf[32];
char cmd_len=0;

void cmd(void);

char putchar (unsigned char i)
{
    ES = 0; //Turn off serial port interrupt
    TI = 0; //Clear serial port send completion interrupt request flag
    SBUF = i;
    while(TI ==0); //Wait for sending to complete
    TI = 0; //Clear serial port send completion interrupt request flag
    ES = 1; //Allow serial port interrupt
return SBUF;
}

void Task_1s()
{
  //printf("S=[%d:%d:%d]\r\n",hh,mm,ss);     _nop_
  ();
}
void Task_1m()
{  
  // printf("M=[%d:%d:%d]\r\n",hh,mm,ss);  _nop_(); } void Task_1h() {    //printf("H=[%d:%d:%d]\r\n",hh,mm,ss);      _nop_(); } //0.1ms = 100us void Timer0(void) interrupt 1 using 1 //Timer 0 interrupt handler {    TR0=0;    TH0=(65536-2000)/256;     TL0=(65536-2000)%256;  tick++; //Count value + 1     if(tick>999) //Add to 10 times, that is, 1 second     {        tick=0;  ss++;  if(ss>59){         mm++; ss=0; if(mm>59){  hh++;  mm=0;  if(hh>11){  hh=0;  }  Task_1h();//1 hour scheduled task }         Task_1m(); //1 minute scheduled task   }   Task_1s();//1 second scheduled task     } TR0=1; }













    



          










          

void UART_one_Interrupt_Receive(void) interrupt 4
{
    unsigned char   k   =   0;
    if(RI==1)
    {
        RI  =   0;
        k   =   SBUF;
        if(cmd_len>32)
{
 cmd_len=0;
}
cmd_buf[cmd_len++]=k;
printf("%c",k);


    }
    else
    {
        TI  =  0;
    }
}

void cmd()
{
   if(strncmp(cmd_buf,"time",4)==0)
   {
      printf("Time=[%d:%d:%d]\r\n",hh,mm,ss);
   }
   else if(strncmp(cmd_buf,"LED1_ON",7)==0)
   {
     LED1=1;
   }
   else if(strncmp(cmd_buf,"LED1_OFF",8)==0)
   {
     LED1=0;
   }
    else if(strncmp(cmd_buf,"LED2_ON",7)==0)
   {
     LED2=1;
   }
    else if(strncmp(cmd_buf,"LED2_OFF",8)==0)
   {
     LED2=0;
   }
   else if(strncmp(cmd_buf,"?",1)==0||strncmp(cmd_buf,"help",4)==0)
   {
      printf("time\r\n");
      printf("help\r\n");
 printf("LED1_ON\r\n");
 printf("LED1_OFF\r\n");
 printf("LED2_ON\r\n");
 printf("LED2_OFF\r\n");
   }
   else
   {
     printf("\r\n错误的命令，如果不知道命令请输入【？】或【help】。\r\n"); 
   }
}
void main()
{
  SCON=0x50; //0101,0000 8位可变波特率，无奇偶校验位
  TMOD=0X21;
  TH1=TL1=-(11059200L/12/32/9600);
  TR1=1;
  tick=0;
  hh=0;
  mm=0;
  ss=0;
  TH0=(65536-2000)/256; 
  TL0=(65536-2000)%256; 
  TR0=1;
  ET0=1;
  ES=1;    //允许串口中断
  EA=1;    //开总中断 
  printf("SystemStart...\r\n");
    while(1)
  {
     _nop_();
if(cmd_len>0)
    if(cmd_buf[cmd_len-1]=='\r')
    {
      cmd();
      printf("\r\nEXOS_V1#:");
      cmd_len=0;
    }
  }
}

Summary: STC microcontroller is still powerful enough.

The key to this program is to use the built-in functions of C language to complete the above functions.

stdio.h ------ printf standard output function

string.h ----- strncmp string comparison function

It is recommended to use Xshell software as the terminal debugging tool. As shown below

If you are interested, just copy the code into KeilC51 V2, compile and run it.