Discussion in "Project Help" started by    spiritgate    Jan 14, 2009.
Wed Jan 21 2009, 02:24 AM
#31
The DB9 connector,J5,in the dev board is RS232.Do not connect the RFID to this.
Instead tap the P0.4 and P0.5 ttl Rx/Tx signals from the connector J3.

For working with the COM port using VB's MSCOMM control refer to this thread...
http://www.8051projects.net/forum-t5021-0.html#post_5060

Also make sure no other device/modem is using the com port you are trying to communicate with.
Wed Jan 21 2009, 04:02 AM
#32
sashijoseph, why cant i connect RFID to microcontroller J5?

Hmm I want to ask about the expander, if I have an expander for serial port, like on the page 1 of this forum, if connect them at the same time with no switch, will there be any clash?

Cause I was thinking for RFID, if I link 1 of them to computer and another one to microcontroller, then the linking should be complete.

But is my theory correct?
Wed Jan 21 2009, 04:34 AM
#33
according to what shashi says...
you have two serial outputs..
1. TTL (Tx-Rx pair direct from port pins)J3.
2. RS232 level Tx-rX (j5).
so if u want to connect rfid directly to the uC do as shashi says.
Wed Jan 21 2009, 05:06 AM
#34
o ok. thanks!

I wan to ask whether is it normal when I send this string "qweqwe" to serial port and when i read it, it return "n"
Wed Jan 21 2009, 08:18 AM
#35
guys what if I wan to try whether if I pass in 5 volt, the microcontroller will read as "1" and when I switch off, it will pass in "0". can be it done with my development board?
Wed Jan 21 2009, 08:38 AM
#36
hi spiritgate

o ok. thanks!

I wan to ask whether is it normal when I send this string "qweqwe" to serial port and when i read it, it return "n"



if u really need help then please add details to your question..
how are u sending qweqwe (PCto uC or uC to PC and how?)
similarlyhow are u reading?

for ur second ques..
yes can be done.

make any port pin as input.
now check if that pin receives high (1)
if yes then transmit /send "1"
else "0"
Wed Jan 21 2009, 08:46 AM
#37
for the second question right, when i try to connect it to the LED together with a wire connecting to serial port (2) and another connecting to serial port (5). also it is connecting to the female side. Then when I put them together, it light up! is it normal?

Then I follow the code given in page 1, so if it is high, SUBF0 will be equal to "1" or 0x01?

Thanks:)

Do I need to set any timer or interrupt for the controller?because i tried it but is not working..


[ Edited Wed Jan 21 2009, 09:28 AM ]
Wed Jan 21 2009, 08:57 AM
#38
For the first question, I am sending it to com port 1.

This is my code:

Set objComport = CreateObject( "ActiveXperts.Comport" )    ' Create a new Comport instance

   objComport.Device              = "COM1"                    ' Use a COM port directly (no Windows Device Driver)
   objComport.BaudRate            = 9600
   objComport.Open                                            ' Open the port
  ' Wscript.Echo "Open, result: " & objComport.LastError
   If( objComport.LastError <>
 0 ) Then
     output.text = "Quit"
   End If

    objComport.WriteString( "0" )                           ' Write command
   str = objComport.ReadString
   'WScript.Echo "Received: [" & str & "]"
      output.text =      "Received: [" +str + "]"
      objComport.Close
Thu Jan 22 2009, 02:13 AM
#39
Anyone know is there any free virtual breadboard software? Because I want to check whether my connection is correct or not. thanks!
Thu Jan 22 2009, 02:19 AM
#40
Guys help me double check....

If I want to communicate with serial port, the things that I do are:

//-----------------------------------------------------------------------------
// Blinky.c
//-----------------------------------------------------------------------------
// Copyright 2005 Silicon Laboratories, Inc.
//
// AUTH: BD
// DATE: 06 FEB 04
//
// This program flashes the green LED on the C8051F35x target board about
// five times a second using the interrupt handler for Timer2.
//
// Target: C8051F35x
//
// Tool chain: KEIL Eval 'c'
//




//-----------------------------------------------------------------------------
//How Program Works?
//-----------------------------------------------------------------------------
//The variable start with seat represent the priority seats in the train
//the seats will given a number,
//"0" means Lights off
//"1" means lights on but without blinking
//"2" means lights on with blinking
//"3" means occupy by priority people
//"4" means occupy by non-priority people




//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <c8051f350.h>
 
#include <stdlib.h>

#include <stdio.h>
  

                  
//-----------------------------------------------------------------------------
// 16-bit SFR Definitions for 'F35x
//-----------------------------------------------------------------------------

sfr16 TMR2RL   = 0xca;                    // Timer2 reload value
sfr16 TMR2     = 0xcc;                    // Timer2 counter

//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------

#define SYSCLK       24500000 / 8         // SYSCLK frequency in Hz

sbit LED1 = P0^0;  
sbit LED2 = P0^1;
sbit LED3 = P0^2;
sbit LED4 = P0^3;

sbit LED7 = P0^6;
sbit LED8 = P0^7;
sbit LED9 = P1^0;
sbit LED10 = P1^1;
sbit LED11 = P1^2;
sbit LED12 = P1^3;
sbit LED13 = P1^4;
sbit LED14 = P1^5;
sbit LED15 = P1^6;
sbit LED16 = P1^7;
sbit nLED = P2^0;

 
                      // LED='1' means ON
sbit SW2 = P1^0; 
int i;
int start;
unsigned int h;
unsigned int p;
unsigned int j;
int testing123=0;
unsigned int seat[17];
unsigned int section;
unsigned char serialNumber[20];
unsigned char a;
unsigned int counter;
unsigned int track;//collect the data that RFID has pass, also act as a stopper





              
		          

//-----------------------------------------------------------------------------
// Function PROTOTYPES
//-----------------------------------------------------------------------------
void SYSCLK_Init (void);
void PORT_Init (void);
void Timer2_Init (int counts);
void Timer2_ISR (void);
void Click (void);
void checkSection (void);
void serial_init();
unsigned char serial_read();
void blinking (void);
void variable_Init(void);
void serial_send(unsigned char dat);

//-----------------------------------------------------------------------------
// MAIN Routine
//-----------------------------------------------------------------------------
void main (void) {

	  j=0;
 if(testing123==0){
	for(i=4; i<8;i++){
	seat[i] = 0;
	 }
	 testing123=1;
	 }
 start=1;

   variable_Init();
   //section=2;//testing purpose
  // track=1;//testing purpose
  
   // disable watchdog timer
   PCA0MD &= ~0x40;                       // WDTE = 0 (clear watchdog timer

   

   SYSCLK_Init ();                        // Initialize system clock
   PORT_Init ();
   serial_init();

   
//------------------------------------------------------------------------    
while (start) {  
  PCA0MD &= ~0x40;
    serial_init();


a=serial_read();

if(a==0x00){
LED7 = 1;
}

   SYSCLK_Init ();                        // Initialize system clock
   PORT_Init ();
 

//where a cycle ends	
if(counter==800){
variable_Init();
counter=0;
track=0;
start=0;
main();
testing123=10;
}

//delay
for (i = 0; i < 10000; i++)  {  /* Delay for 10000 Counts */
                            /* call wait function */
}

//------------------------------------------------
//Switch testing purpose
//------------------------------------------------

while(SW2==0){

if(section==0 && track ==0){
     section=2;
  track=1;
     counter=1;
      
	 for (i = 0; i < 18000; i++)  {  /* Delay for 10000 Counts */
                            /* call wait function */
}
 

  
}else{
if(seat[7]==3 && seat[6]==3){
seat[7]=4;
seat[6]=4;
seat[5]=4;
seat[4]=4;
}else{
if(seat[7]==3){
seat[6]=3;
}else{
seat[7]=3;
}
}
counter = 799;
start=0;
testing123=10;
 main();


}

}


//-----------------------------------------------
if(track==2){
nLED = ~nLED;
}
//serial_read();//read from serial port
if(track==1){
checkSection();//check priority seats
blinking();

} //determine which seats to light up
 counter++;

}//end main routine
//-----------------------------------------------------------------------------------


   EA = 1;											// enable global interrupts

   
}

//-----------------------------------------------------------------------------
// SYSCLK_Init
//-----------------------------------------------------------------------------
//
// This routine initializes the system clock to use the internal 24.5MHz / 8
// oscillator as its clock source.  Also enables missing clock detector reset.
//
void SYSCLK_Init (void)
{
   OSCICN = 0x80;                         // configure internal oscillator for
                                          // its lowest frequency
   RSTSRC = 0x04;                         // enable missing clock detector
}
//-----------------------------------------------------------------------------
// serial_Init
//-----------------------------------------------------------------------------
void serial_init(){
        TMOD = 0x20;  
        SCON0 = 0x50;
        TH1  = 0xFD;
        TL1  = 0xFD;
        TR1  = 1;
}


//-----------------------------------------------------------------------------
// serial_read
//-----------------------------------------------------------------------------
//
// To read data from SBUF0

// 
unsigned char serial_read(){
         while(!RI0);
        RI0 = 0;
        return SBUF0;
}

//-----------------------------------------------------------------------------
// Blinking
//-----------------------------------------------------------------------------
//
void blinking (void){
if(seat[0]==1){
LED1 = 1;
}
if(seat[1]==1){
LED2 = 1;
}
if(seat[2]==1){
LED3 = 1;
}
if(seat[3]==1){
LED4 = 1;
}

if(seat[6]==1){
LED7 = 1;
}
if(seat[7]==1){
LED8 = 1;
}
if(seat[8]==1){
LED9 = 1;
}
if(seat[9]==1){
LED10 = 1;
}
if(seat[10]==1){
LED11 = 1;
}
if(seat[11]==1){
LED12 = 1;
}
if(seat[12]==1){
LED13 = 1;
}
if(seat[13]==1){
LED14 = 1;
}
if(seat[14]==1){
LED15 = 1;
}
if(seat[15]==1){
LED16 = 1;
}

 
 
	if(seat[0]==2){
      LED1 = ~LED1;
    }
    if(seat[1]==2){
      LED2 = ~LED2;
    }
    if(seat[2]==2){
      LED3 = ~LED3;
    }
    if(seat[3]==2){
      LED4 = ~LED4;
    }
   
    if(seat[6]==2){
      LED7 = ~LED7;
    }
    if(seat[7]==2){
      LED8 = ~LED8;
    }
    if(seat[8]==2){
      LED9 = ~LED9;
    }
    if(seat[9]==2){
      LED10 = ~LED10;
    }
    if(seat[10]==2){
      LED11 = ~LED11;
    }
    if(seat[11]==2){
      LED12 = ~LED12;
    }
    if(seat[12]==2){
      LED13 = ~LED13;
    }
    if(seat[13]==2){
      LED14 = ~LED14;
    }
    if(seat[14]==2){
      LED15 = ~LED15;
    }
    if(seat[15]==2){
      LED16 = ~LED16;
    }
                  
}



void variable_Init(void){

 counter=0;
 section=0;
 LED1 = 0;
 LED2 = 0;
 LED3 = 0;
 LED4 = 0;

 LED7 = 0;
 LED8 = 0;
 LED9 = 0;
 LED10 = 0;
 LED11 = 0;
 LED12 = 0;
 LED13 = 0;
 LED14 = 0;
 LED15 = 0;
 LED16 = 0;
 nLED = 0;
 track = 0;

}
//-----------------------------------------------------------------------------
// PORT_Init
//-----------------------------------------------------------------------------
//
// Configure the Crossbar and GPIO ports.	
// P0.7 - LED (push-pull)
//
void PORT_Init (void)
{
   XBR0     = 0x00;                       // no digital peripherals selected
   XBR1     = 0x40;                       // Enable crossbar and weak pull-ups
   P0MDOUT |= 0xFF;                       // enable LED as a push-pull output
   SW2 = 1;
  //P1MDOUT |= 0xFF; 
   P1MDIN |= 0xFF;                   
}
void Click (void)  
{                  
                    /* only to delay for LED flashes */
}





void checkSection (void)
{
//---------------------------------------------------------------------
//section 1
//---------------------------------------------------------------------
if(section==1){

if(seat[1]>
2 && seat[0]>
2 && seat[2] >
2 && seat[3]>
2){
	

	 for(i=0; i<4; i++){
        if(seat[i]==4){
           seat[i]=2;
        }
     }
	 //------------------------------------------------------------
     if(seat[5]==0 || seat[4]==0 || seat[7]==0 || seat[6]==0){
	     for(i=4; i<8; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
	
	 }
	 //-------------------------------------------------------------
	 else if(seat[9]==0 || seat[10]==0 || seat[11]==0 || seat[8]==0){
	 for(i=8; i<12; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
	 }
	 //--------------------------------------------------------------
	 else if(seat[13]==0 || seat[14]==0 || seat[15]==0 || seat[12]==0){
	 for(i=12; i<16; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
	 }
	 //---------------------------------------------------------------

}else{
         for(i=0; i<4; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
}//end else
section=0;
}
//---------------------------------------------------------------------
//Section 2
//---------------------------------------------------------------------
if(section==2){
if(seat[5]>
2 && seat[4]>
2 && seat[7]>
2 && seat[6]>
2){
      for(i=4; i<8; i++){
           if(seat[i]==4){
              seat[i]=2;
           }
         }
	 //----------------------------------------------------------	 
     if(seat[2]==0 || seat[3]==0 || seat[9]==0 || seat[8]==0){
	  if(seat[3]==0){
	     seat[3] = 1;
	  }if(seat[2]==0){
	     seat[2] = 1;
	  }if(seat[9]==0){
	     seat[9] = 1;
	  }if(seat[8]==0){
	     seat[8] = 1;
	  }
	 }
	 //-----------------------------------------------------------
	 else if(seat[0]==0 || seat[1]==0 || seat[11]==0 || seat[10]==0){
	  if(seat[0]==0){
	      seat[0] = 1;
	 }if(seat[1]==0){
	      seat[1] = 1;
	 }if(seat[11]==0){
	      seat[11] = 1;
	 }if(seat[10]==0){
	      seat[10] = 1;
	 }
	 }
	 //------------------------------------------------------------
	 else if(seat[13]==0 || seat[14]==0 || seat[15] ==0 || seat[12]==0){
	    for(i=12; i<16; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
	 }
	 //-------------------------------------------------------------
}else{
        for(i=4; i<8; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
}//end else
section=0;
}
//---------------------------------------------------------------------
//Section 3
//---------------------------------------------------------------------
if(section==3){
if(seat[8]>
2 && seat[9]>
2 && seat[10]>
2 && seat[11]>
2){
		 for(i=8; i<12; i++){
           if(seat[i]==4){
              seat[i]=2;
           }
         }

     //-----------------------------------------------------------------
     if(seat[6]>
0 && seat[7]>
0 && seat[13] >
0 && seat[12]>
0){
	 if(seat[6]==0){
	 seat[6] = 1;
	 }if(seat[7]==0){
	 seat[7] = 1;
	 }if(seat[13]==0){
	 seat[13] = 1;
	 }if(seat[12]==0){
	 seat[12] = 1;
	 }
	 }
	 //------------------------------------------------------------------
	 else if(seat[15]>
0 && seat[14]>
0 && seat[4] >
0 && seat[5]>
0){
	  if(seat[5]==0){
	 seat[5] = 1;
	 }if(seat[15]==0){
	 seat[15] = 1;
	 }if(seat[14]==0){
	 seat[14] = 1;
	 }if(seat[4]==0){
	 seat[4] = 1;
	 }
	 }
	 //-------------------------------------------------------------------
	 else if(seat[1]>
0 && seat[2]>
0 && seat[3] >
0 && seat[0]>
0){
	  if(seat[1]==0){
	    seat[1] = 1;
	 }if(seat[2]==0){
	 seat[2] = 1;
	 }if(seat[3]==0){
	 seat[3] = 1;
	 }if(seat[0]==0){
	 seat[0] = 1;
	 }
	 }
	 //--------------------------------------------------------------------
}else{
        for(i=8; i<12; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
}//end else
section=0;
}
//---------------------------------------------------------------------
//Section 4
//---------------------------------------------------------------------
if(section==4){
if(seat[13]>
2 && seat[14]>
2 && seat[15] >
2 && seat[12]>
2){
        for(i=12; i<16; i++){
           if(seat[i]==4){
              seat[i]=2;
           }
         }
     if(seat[9]>
0 && seat[10]>
0 && seat[11] >
0 && seat[8]>
0){
	  for(i=8; i<12; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
	 }
	 else if(seat[4]>
0 && seat[5]>
0 && seat[6] >
0 && seat[7]>
0){
	  for(i=4; i<8; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
	 }
	 else if(seat[0]>
0 && seat[1]>
0 && seat[2] >
0 && seat[3]>
0){
	  for(i=0; i<4; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
	 }
}else{
        for(i=12; i<16; i++){
           if(seat[i]==0){
              seat[i]=1;
           }
         }
}//end else
}//end if IF
section=0;
}//end void
//-----------------------------------------------------------------------------
// Timer2_Init
//-----------------------------------------------------------------------------
//
// Configure Timer2 to 16-bit auto-reload and generate an interrupt at
// interval specified by <counts>
 using SYSCLK/48 as its time base.
//
void Timer2_Init (int counts)
{
 
   TMR2CN  = 0x00;                        // Stop Timer2; Clear TF2;
                                          // use SYSCLK/12 as timebase
   CKCON  &= ~0x60;                       // Timer2 clocked based on T2XCLK;

   TMR2RL  = -counts;                     // Init reload values
   TMR2    = 0xffff;                      // set to reload immediately
   ET2     = 1;                           // enable Timer2 interrupts
   TR2     = 1;
   
                            // start Timer2
}

//-----------------------------------------------------------------------------
// Interrupt Service Routines
//-----------------------------------------------------------------------------

//-----------------------------------------------------------------------------
// Timer2_ISR
//-----------------------------------------------------------------------------
// This routine changes the state of the LED whenever Timer2 overflows.
//
void Timer2_ISR (void) interrupt 5
{
   TF2H = 0;                              // clear Timer2 interrupt flag
   LED1 = ~LED1;  
   LED1 = ~LED1;                          // change state of LED
}


is it correct? like that can communicate with port 1? If this one can then my problem now is with the circuit. Because I need to pass a "1" or "0" to the serial port. And if it reads it, 1 of the LED on the development board will light up.


Thanks!

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