C51: Interfacing Flash AT29C512 with AT89C51

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...

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...

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

Just following your advice, Hello World
Hope am not testing your patience Sir,
kindly explain this,
In the program, Rx() where we write to ACC works,
but Tx() where we read from ACC does not work,

ACC is defined in REG51.h, then should not we write to ACC?

Thanks for all the help
That little devil was in the while loop
Tx(){
SBUF = ACC;
while(TI){}
TI = 0
}

Surely learnt a lot hunting it down,
Thanks again