regarding interfacing!!!

[Dharmit]

hi guys,

 

got a really big question,

 

we got two microcontrollers and we need to send in the data from both of them to the PC, so can we just use one serial port or we need seperate ports for it?

 

Thank you. 

[Anonymous]

I think yes you can send the data, just connect the output of both the microcontroller to the same serial port. I am not sure whether this will work for sure but you will have to experiment.

 

Alternatively why dont you send the data of second controller to first and from there send it to the serial port??? 

[Dharmit]

hey thanks for that,

 

Can u please send me the code for sending the data frm one microcontroller to the other………and then to the serial port! 

[Anonymous]

i dont have the direct code.. but thats so simple.. just connect the ports of one to the other. Make the port on first microcontroller as output and on the second as input.. 

[Dharmit]

hey I have a code for serial interfacing in C, and also a code for the stop watch design in C, so i want to know how to integrate both codes together in order to make a one hex file.

 

here is the code for serial interfacing:

 

#include<reg51.h>

void ini()     // Initialize Timer 1 for serial communication

{

TMOD=0x20;  //Timer1, mode 2, baud rate 9600 bps

TH1=0XFD;

SCON=0x50;

TR1=1;

}



void recieve()  //Function to receive serial data

{

unsigned char value;

while(RI==0);

SBUF=value;

P1=SBUF;

RI=0;

}



void transmit()  // Funtion to transmit serial data

{

P2=P1-32;

SBUF=P2;

while(TI==0);

TI=0;

SBUF=P1;

while(TI==0);

TI=0;

}



void main()

{

while(1)

{

ini();

recieve();

transmit();

} 

And here is the code for stop watch timer in C:

 

#include<reg51.h>

#define msec 1

unsigned int sec1,sec2;

int sec1_1,sec1_2,sec2_1,sec2_2;

 

unsigned int

digi_val[10]={0x40,0xF9,0x24,0x30,0x19,0x12,0x02,0xF8,0x00,0x10};

sbit dig_ctrl_1=P1^0;  

sbit dig_ctrl_2=P1^1;

sbit dig_ctrl_3=P1^2;

sbit dig_ctrl_4=P1^3;

sbit start_pin = P1^4; 

sbit stop_pin = P1^5; 

sbit reset_pin = P1^6; 

int s,t;

 

void mplex_delay(unsigned int time) 

{

int i,j;

for (i=0;i<=time;i++)

  for(j=0;j<=50;j++);

}

 

void digi_out(unsigned int current_num)

{

    P2=digi_val[current_num];

     mplex_delay(msec);

}

 

void display(unsigned int dig1,unsigned int dig2)

{

    sec1_2=dig1%10;

sec1_1=dig1/10;

sec2_2=dig2%10;

sec2_1=dig2/10;

TMOD=0x01;  

TL0=0xFF;

TH0=0xDB;

TR0=1;  

while(TF0==0)

{

  dig_ctrl_1 = 1;

  dig_ctrl_2 = dig_ctrl_3 = dig_ctrl_4 = 0;

  digi_out(sec1_1);

  dig_ctrl_2 = 1;

  dig_ctrl_1 = dig_ctrl_3 = dig_ctrl_4 = 0;

  digi_out(sec1_2);

  dig_ctrl_3 = 1;

  dig_ctrl_2 = dig_ctrl_1 = dig_ctrl_4 = 0;

  digi_out(sec2_1);

  dig_ctrl_4 = 1;

  dig_ctrl_2 = dig_ctrl_3 = dig_ctrl_1 = 0;

  digi_out(sec2_2);

}

 

TR0=0;

TF0=0;

}

 

void main()

{

while(1)

{

start:  

  start_pin = 1;

  stop_pin = 1;

  reset_pin = 1;

  dig_ctrl_1 = 0;

  dig_ctrl_2 = 0;

  dig_ctrl_3 = 0;

  dig_ctrl_4 = 0;

  P2 = 0xFF;

  s = t = 0;

  while(start_pin == 1)

  {

  display(0,0);

  }

 

stopwatch:  

  for (sec1=s;sec1<=99;sec1++)

  {

   if (stop_pin == 0 )  

   break;

    for (sec2=t;sec2<=99; sec2++)

    {

    if (stop_pin == 0 )  

    break;

    t=0;

    display(sec1,sec2);

    }

  }

  stop_pin = 1;

  s = sec1;

  t = sec2;

 

  while ( start_pin != 0 && reset_pin != 0 )  

  {

  display(sec1,sec2);

  }

 

  if (start_pin == 0) 

  {

  goto stopwatch;

  }

  else

  {

   if (reset_pin == 0 )  

   {

   s = t = 0;

   goto start;

   }

  }

}

}

 

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