Help for serial communication

[Radhika]

Hello,

I am developing a controller based serial communication project  in which I am sending two data to serial port. One is for selecting output pin & second for getting different timer delay value to generate different delayed pulses. My problem is that I can’t properly send data to serial port please help me if anyone have idea about this.

I am using AT89c52 controller & max232 for level converter. Here is my code.

Please help me..

Thanks in advance.

My code:

 

 

#include <AT89X52.H>

#include<stdio.h>

 

sbit Pulse1=P1^0;

sbit Dir1=P1^1;

sbit Pulse2=P1^2;

sbit Dir2=P1^3;

 

sbit a=P0^0;

sbit b=P0^1;

sbit c=P0^2;

sbit d=P0^3;

 

msdelay(unsigned int value);

getdata();

unsigned int value;

 

getdata()

{

        if(b)   // For Dir1

        Dir1=1;

        if(d)    //  For Dir2

        Dir2=1; 

        

if((!a)&(!c))

{

Pulse1=0;

Pulse2=0;

}

 

if(a&(!c))         

   {

Pulse1=1;

msdelay(value);

Pulse1=0;

msdelay(value);

}

 

if((!a)&c)

{

Pulse2=1;

msdelay(value);

Pulse2=0;

msdelay(value);

}

 

if(a&c)

{

Pulse1=1;

Pulse2=1;

msdelay(value);

Pulse1=0;

Pulse2=0;

msdelay(value);

}

}

void recive(void) interrupt 4

{

unsigned int mybyte,i;

  while(1)

  {

if(RI==1)

{

P0=0xFF;

    ACC=0x00;

    P1=0x00;

}

 

if(i==0)

{

 mybyte=SBUF;

 ACC=mybyte;

 P0=ACC;

 RI=0;

 i++;

}

 

if(i==1)

{

 mybyte=SBUF;

 ACC=mybyte;

 value=ACC;

 RI=0;

 i=0;

}

getdata();

   }

}

void main()       

{  

   P1=0x00;

   EA=1;

   ES=1;  

   SCON = 0x50; // mode 1, 8-bit UART, enable receiver 

   TMOD = 0x20; // timer 1, mode 2, 8-bit auto-reload 

   TH1 = 0xFD; // for 9600 baud rate 0xFD

   TR1 = 1;    // run timer 1

  

   while (1) 

   { 

   }

 

}

 

//delay function

msdelay(unsigned int value)

{

unsigned int x,y;

for(x=0;x<value;x++)

for(y=0;y<1275;y++);

} 

[AJISH ALFRED]

Hi Radhika,

Where are you trying to display the data? Are you getting junk data or simply nothing?

[Radhika]

I am dispiaying data on Led connected toPort1 but when i enter two data it accepts only one either 1st or 2nd data as input.

Here problem is in accepting 2nd input but i dnt know how to solve it… Please help me.

[AJISH ALFRED]

You are not calling any functions from your main function. Then how the code will it do something?

[Author]

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