uart echo data

I want to see character back to terminal whatever I type on terminal. My code is not working

#include <reg51.h>


void uart_init();          
char getc();              
void putc (char c);          
void puts(char *s);        

void uart_init()                  // Initializes UART peripheral
{
  TMOD = 0x20;                    // Timer1, mode 2
  TH1  = 0xFD;                    // 9600 bps 11059200 Clock, core(12cycle), uart(SMOD=0)
  TL1  = 0xFD;                    // First byte timing
  SCON = 0x52;                    // 0x52 : 0101 0010  Receive Enable, TI as 1 (set as ready)
  TR1  = 1;
}

char getc()                       // Polled method to Receive a byte(8bit)
{
  while (RI == 0);                // Wait until a byte has been received                        
  RI = 0;                         // Acknowledge RI
  return SBUF;                   
}

void putc (char c)           
{
  while (TI == 0);                                  
  SBUF = c;                      
	
}

void puts(char *s)           // Typical puts for uart Transmit a string-null-terminated
{
  while (*s!=0)                   // Check for null byte termination
  putc(*s++);                // and send each byte using uart
}


void main ()
{
   char c;

   uart_init();             // Init UART to desired settings
   puts("Anssh");

   while (1) 
	{                         // This loop echoes back whatever is typed on PC Keyboard
     c = getc();            //    get next byte from PC
     putc(c);               //    and send it back as echo
  }

}

How to get echo character on terminal?

You need to reset TI

void putc (char c)           
{
  while (TI == 0);                                  
  TI = 0;
  SBUF = c;                      
}
 

You need to reset TI

ExperimenterUK

Can you give a little more information about this. How to do it ?

Use the code in my last post.

Use the code in my last post.

ExperimenterUK

I did but code is not working

#include <reg51.h>

 
 
void uart_init();          
char getc();              
void putc (char c);          
void puts(char *s);        
 
void uart_init()                  // Initializes UART peripheral
{
  TMOD = 0x20;                    // Timer1, mode 2
  TH1  = 0xFD;                    // 9600 bps 11059200 Clock, core(12cycle), uart(SMOD=0)
  TL1  = 0xFD;                    // First byte timing
  SCON = 0x52;                    // 0x52 : 0101 0010  Receive Enable, TI as 1 (set as ready)
  TR1  = 1;
}
 
char getc()                       // Polled method to Receive a byte(8bit)
{
  while (RI == 0);                // Wait until a byte has been received                        
  RI = 0;                         // Acknowledge RI
  return SBUF;                   
}
 

 
void putc (char c)           
{
  while (TI == 0);                                  
  TI = 0;
  SBUF = c;                      
}
 
void puts(char *s)           // Typical puts for uart Transmit a string-null-terminated
{
  while (*s!=0)                   // Check for null byte termination
  putc(*s++);                // and send each byte using uart
}
 
 
void main ()
{
   char c;
 
   uart_init();             // Init UART to desired settings
   puts("Anssh");
 
   while (1) 
	{                         // This loop echoes back whatever is typed on PC Keyboard
     c = getc();            //    get next byte from PC
     putc(c);               //    and send it back as echo
  }
 
}

I tested the code you posted in Proteus and it works.
Be sure Proteus is loading the correct code.
If it still does not work, post your Proteus and Keil files.

I tested the code you posted in Proteus and it works.
Be sure Proteus is loading the correct code.
If it still does not work, post your Proteus and Keil files.

ExperimenterUK

Please look at the attached file

In the rar file you just posted,
the routine "void putc (char c) "
does not contain the line "TI=0;"
Add it.

In the rar file you just posted,
the routine "void putc (char c) "
does not contain the line "TI=0;"
Add it.

ExperimenterUK

sorry for posting wrong file but still I am not getting echo character

look at this file

TI= 0 is still missing
from putc (char c)