C51: Interfacing Flash AT29C512 with AT89C51

thanks a lot,

got the receive data part right , not bad, for a start i suppose
the sample surely helped in sending data
though not able to find why the data is not being sent on the hyperterminal

P1 = byte;
ACC = byte;
SBUF = ACC;

any thing to be added to this?

thanks a lot,

got the receive data part right , not bad, for a start i suppose
the sample surely helped in sending data
though not able to find why the data is not being sent on the hyperterminal

P1 = byte;
ACC = byte;
SBUF = ACC;

any thing to be added to this?

though not able to find why the data is not being sent on the hyperterminal

where/what is the UART initialize code?

TMOD = 0x20;
TH1 = -3;
SCON = 0x50;
TR1 =1;
TI = 0;

the initialize code is in Main() program
with 4800 or 9600 baud

sir,
have tried at this
just not getting data on hyperterminal
though it is being transmitted from 8051,
displeyed thru port-1 also,

this is the code which i used:

#include<reg51.h>
#include<stdio.h>

Rx();
Tx();

void main (void){
        TMOD = 0x20;
        TH1 = -3;               // 9600 baud, SMOD = 0;
        SCON = 0x50;    // 8 bit, 1 stop, REN-1
        TR1 = 1;
        TI = 0;
        Rx();
}

Rx(){
        while (1){              //(RI=1){
                ACC = 0000;
                ACC = SBUF;
                P1 = ACC;
                Tx();
                RI = 0;
                Rx();
        }
}

Tx(){
        // ACC = (ACC + 48);
        SBUF = ACC;
        while(TI){
                TI = 0;
        }
}

just not getting data on hyperterminal

which transciever (e.g. MAX232) do you use and what is the supply voltage for it?

Erik

You should not be writing direct to ACC in 'C'!!

Your Rx() function calls itself in an infinite loop!

Throw this code away, and start with the "Hello World" sample.
Then build on that...

Ya using MAX232
Actually, the terminal works fine with assembly program
In the above program, Rx() also works.
There is some problem with this 'Tx()' function
could somebody Please help me out what is that fine change to be done

Sorry, Rx() was not being called recursively, that line was supposed to be commented
Sorry for that
To call recursively, I believe it should be declared as "reentrant"

Why should we write to ACC directly in 'C'?
then how do we write to ACC?

Why should we notwrite to ACC directly in 'C'?
because you do not need to
then how do we write to ACC?
you do not need to and, if you do, you are virtually guaranteed to make the code fail.

  ACC = (ACC + 48);
  SBUF = ACC;

should be
U8 Ralph;
....

  Ralph += 48;
  SBUF = Ralph

Erik

"Why should we not write to ACC directly in 'C'?"

You should not do it in any high-level language!

Because, when you use a high-level language (eg, 'C'), you delegate control of the low-level CPU registers to the compiler.

See: http://www.keil.com/forum/docs/thread8360.asp

"To call recursively, I believe it should be declared as 'reentrant'"

Even that won't help you if you call it recursively in an infinite loop!

I still recomend that you start with the "Hello World" sample.

The whole process of creating, building, and running the "Hello World" sample is explained in the Getting Started Guide. You should read and follow this - it will give you a proper introductions to the tools, how they work, and how to use them - rather than just jumping-in blindly at the deep-end!

http://www.keil.com/support/man/docs/uv3/uv3_creating_apps.htm

Then how come Rx() function works,
and could you tell me why do we add 48?

I mean, to be called recursively it ought to be declared as reentrant, else no difference na

try checking status of ti and ri before getting into loop