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UART 8051 - Read data
Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph
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say2paul
Fri Jul 04 2008, 11:39AM
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I know my post might look weird as I am noob, but believe me I only got time to learn uC's at night as I am really very busy in daytime with Symbian C++.

Please look at the following code and let me know the mistake, here I am trying to print back a character to the hyper terminal in window OS. I wrote the code in such a way so that it can detect the character entered by user in hyper terminal and then send the same back to the hyper terminal.

I know I must be doing something wrong that is why I am unable to type anything on the Hyper Terminal

CODE:
#include<P89V51Rx2.h>
#include<intrins.h>
#include<string.h>

void delay()

   {
    int i;
 for(i=0;i<9000;i++);
 }
 
void serial_send(unsigned char dat){
        while(!TI);
        TI = 0;
        SBUF = dat;
}
unsigned char serial_read(){
        while(!RI);
        RI = 0;
        return SBUF;
}          
                   
 void main()
   {
unsigned char i,data1;        
    TMOD=0x20;
    SCON=0x50;
    TH1=0xfd;
    TL1=0xfd;
    TR1=1;
  while(1)
        {
                char a = serial_read();
                delay();
                serial_send(a);
        }       
}              
 
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Ajay
Mon Jul 07 2008, 08:01AM
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I am not sure how you're able to compile it

coz you are using C now.. not c++ so

this thing is not possible within the program..
CODE:
char a = serial_read();


As per ANSI C you have to define the character at the top of program.
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Ajay
Mon Jul 07 2008, 08:02AM
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I am moving your post in 8051 discussion section
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sashijoseph
Mon Jul 07 2008, 07:47PM

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void serial_send(unsigned char dat){
while(!TI);
TI = 0;
SBUF = dat;
}


Change to ...

void serial_send(unsigned char dat){
SBUF = dat;
while(!TI);
TI = 0;

}
Let there be music........
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Ajay
Tue Jul 08 2008, 08:01AM
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Sashi what paul wrote is fine just the problem is he declared the variable within the function which is not valid in C

he is used to of c++ a lot i guess
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say2paul
Tue Jul 08 2008, 08:38AM
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Its fact... and its difficult to follow C Standards...

But I will get use to it
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