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[SOLVED] problem in serial port using 89c2051

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m2star

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i am working on a project, in which i have to receive data serially form PC
and show it on LCD, for this purpose i have to use micro-controller 89c2051
BUT i am facing an annoying problem with serial port,
its is not properly receiving the data which i am sending from PC
i use the following code for bouncing back the received data
but its not not working can anyone help??????????
" 
Code C - [expand]
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INITHW();
uchar RByte;
while(1)
    {
        RECByte();
        SNDByte(RByte);
       }
void INITHW()
{
    TMOD=0x20;  //Timer 1, 8-bit auto-reload
    TH1=0xFA;   //4800 baud rate
    //TL1=0xFA;
    SCON=0x50;  //8-bit , 1 stop bit, REN enabled
    TR1=1;      //start timer 1
}
void RECByte()
{
    while(!RI);
    RByte=SBUF;
    RI=0;
}
void SNDByte(uchar SByte)
{
    SBUF=SByte;
    while(!TI);
    TI=0;   
}

"
 
Last edited by a moderator:

try this
Code: 
#include <reg51.h>
main()
{
char c;
// set timer1 in auto reload 8 bit timer mode 2
TMOD=0x20;
// load timer 1 to generate baud rate of 4800 bps
TH1 = 0xFA;
// set serial communication in mode 1
SCON=0x40;
// start timer 1
TR1 = 1;
while(1)
{
// enable reception
REN = 1;
//wait until data is received
while((SCON & 0X02) == 0);
// same as while(RI==0);
// reset receive flag
RI=0;
// read a byte from RXD
c = SBUF;
// disable reception
REN = 0;
 
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