Transmitting an integer serially by AT89S51

[Saad Rafey]

 

I have written a program to transmit char value serially for AT89S51. Its is working perfectly.

 

Program is given below:-

 

 

 

 

     #include<reg51.h>

     void main()

     {

     TMOD=0x20;

     TH1=0xFD;

     SCON=0x50;

     TR1=1;

     while(1)

     {

     SBUF=’A’;

     while(TI==0);

     TI=0;

     }

     }

 

 

 

 

In above code char ‘A’ is transmitted.

 

Now I want to transmit an integer value and I have written a program for it.

 

Program is given below:-

 

 

 

     #include<reg51.h>

     void main()

     {

     int i=61;

     TMOD=0x20;

     TH1=0xFD;

     SCON=0x50;

     TR1=1;

     while(1)

     {

     SBUF=i;

     while(TI==0);

     TI=0;

     }

     }

 

 

 

Above program is transmitting ‘ = ‘(i.e decimal 61 corresponds to ‘ = ‘  character in ASCII).

 

I want to know how I can transmit an integer value.

 

Please guide me in this regard.  

[AJISH ALFRED]

Hi Saad,

You can transmit a single digit integer like this.

If you have a single digit integer, say ‘7’ stored in a variable ‘i’

 

int i = 7

 

Now you can transmit the ‘7’ using the following,

 

SBUF = ‘0’ + i;                //Simply adding the value to the ascii value of zero

 

Hope this helps.

[Author]

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