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UART 8051 - Read data

Fri, 04 Jul 2008 11:39:52 -0700

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
#include
#include

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);
        }       
}              
 

Re: UART 8051 - Read data

contact@nospam.com (Ajay Bhargav) — Mon, 07 Jul 2008 08:01:35 -0700

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.

Re: UART 8051 - Read data

contact@nospam.com (Ajay Bhargav) — Mon, 07 Jul 2008 08:02:18 -0700

I am moving your post in 8051 discussion section

Re: UART 8051 - Read data

contact@nospam.com (Ajay Bhargav) — Tue, 08 Jul 2008 08:01:06 -0700

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

Re: UART 8051 - Read data

contact@nospam.com (Ajay Bhargav) — Mon, 07 Jul 2008 19:47:57 -0700

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;

}

Re: UART 8051 - Read data

contact@nospam.com (Ajay Bhargav) — Tue, 08 Jul 2008 08:38:10 -0700

Its fact... and its difficult to follow C Standards...

But I will get use to it