to read from sbuf in 8051

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fatima_just

Joined: 13 Sep 2008
Posts: 19

01 Dec 2008 18:55 sbuf in 8051

please help me .

I use uvision Kiel software to program 8051 using C language like this :
unsigned char SerialRecvChar()
{
//initialization
TMOD = 0x20; // timer 1 (8 bit auto-reloed)
TH1 = 0xFD; //to obtain 9600 baud rate
TR1 = 1; //start timer
SCON = 0x50;
//IE= 0x90;
P1= 0x00;

unsigned char i;
while(!RI); //waits till a byte is recieved
RI = 0;
i = SBUF ; //must get SBUF value
return SBUF;
}

but when I run the code to show (i = Sbuf ) then (i) not get the value from SBUF )

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besthabit

Joined: 07 Oct 2007
Posts: 27
Location: Islamabad

26 Jan 2009 5:56 sbuf register in 8051

simplest example (read & write from RS232 using Hyperterminal baud rate 1200) 8051

Get the value in main

char getCharacter (void)
{
char chr; // variable to hold the new character
while (RI != 1) {;}
chr = SBUF;
RI = 0;
return(chr);
}

void send (char a)
{
SBUF = a;
while (TI != 1);
TI=0;
}

void main (void)
{

SCON = 0x50; // mode 1, 8-bit uart, enable receiver
TMOD = 0x20; // timer 1, mode 2, 8-bit reload
TH1 = 0XE6; // for 9600 baud rate 0XFD
TL1 = 0XE6;
TR1 = 1;
TI = 0;
SBUF =0;

while (1)
{
your code

}//end of while
}//end of main