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RFID Development Kit Can't Read RFID Data

 
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muiratinas



Joined: 13 Oct 2010
Posts: 16

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RFID Development Kit Can't Read RFID Data
PostPosted: Wed Oct 13, 2010 5:40 am     Reply with quote
I just bought the development kit of the ccs. I read the RFID exercise book and write the codes from it. First examples worked fine (no RFID related examples) but RFID examples didn't.
When I looked up the 4095's demod out pin with an oscilloscope, it seems ok, with sending data to mc.
Could you look the code and say me whats wrong?
Thanks

main code:
Code:

#include <16F876A.h>
#fuses HS, NOWDT, NOPROTECT, NOLVP, NOBROWNOUT, PUT
#use delay(clock=20000000)

#define GREEN_LED PIN_C3
#define YELLOW_LED PIN_C4
#define RED_LED PIN_C5

#define RS485_ID  0x11
#define RS485_USE_EXT_INT  FALSE
#define ADAPTER_RS485_ID   0x7F

#include <em4095.c>
#include <em4102.c>
#include <rs485.c>
#INCLUDE <stdlib.h>
int8 msg[32];
#include "utilities.c"

void main()
   {
   int8 customerCode;
   int32 tagNum;
     
   rf_init();
   rf_powerDown();
   rs485_init();
   output_low(GREEN_LED);
   
   sprintf(msg, "\ntest");
   RS485send(msg);
   
   for(;;)
      {
      if(read_4102(msg))
         {
         customerCode = msg[0];
         tagNum = make32(msg[1], msg[2], msg[3], msg[4]);
         
         sprintf(msg, "Customer Code: %u\n\r", customerCode);
         RS485send(msg);
         sprintf(msg, "Tag Number: %lu\n\n\r", tagNum);
         RS485send(msg);
      }
   }
}


utility code:
Code:

void RS485send(char* s)
{
   int8 size;
   for(size=0; s[size]!='\0'; ++size);
   rs485_wait_for_bus(FALSE);
   while(!rs485_send_message(ADAPTER_RS485_ID, size, s))
   {
   delay_ms(RS485_ID);
   }

}

char RS485getc()
{
rs485_get_message(msg, TRUE);
return msg[2];
}

int8 RS485getInt()
{
   int8 i=0, s[5];
   
   while(i < 5)
   {
      s[i] = RS485getc();
      if(s[i] == '\r')
      {
         i=5;
      }
      else
      {
         ++i;
      }
   }
   
      return atoi(s);
}

int32 RS485getI32()
{
   int8 i = 0, s[11];
   
   while(i<11)
   {
      s[i] = RS485getc();
     
      if(s[i]== '\r')
      {
         i=11;
       
      }
      else
      {
         ++i;
      }
   }
   
   return atoi32(s);
}


typedef enum{OFF, GREEN, RED} LEDcolor;

void twoColorLED(LEDcolor color)
{
   switch(color)
   {
      case OFF:
         output_low(PIN_A3);
         output_low(PIN_A5);
         break;
      case GREEN:
         output_high(PIN_A3);
         output_low(PIN_A5);
         break;
      case RED:
         output_low(PIN_A3);
         output_high(PIN_A5);
         break;
   }
}
muiratinas



Joined: 13 Oct 2010
Posts: 16

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PostPosted: Thu Oct 14, 2010 4:38 am     Reply with quote
My kit revision is the revision 2, do i need to change something?
muiratinas



Joined: 13 Oct 2010
Posts: 16

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PostPosted: Tue Oct 19, 2010 1:13 am     Reply with quote
when debugging it, it seems getting out of the command of em4095.c's 303th row;

Code:
while(dataTransferred < numBits && timer0_overflows < 15);


what could be the problem?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Oct 19, 2010 1:20 pm     Reply with quote
I don't have the RFID kit, and I don't know much about it, but my advice
is to use the CCS examples. Make those work first. Then try your own
code. Here's the example file:
Quote:
c:\program files\picc\examples\ex_rfid.c


I do notice that you are doing strange things in your program.
For example, you want to use the RFID device. But then you
turn it off, as shown in bold below. Why ? To use a device,
you normally would turn it on.
Quote:
void main()
{
int8 customerCode;
int32 tagNum;

rf_init();
rf_powerDown();
rs485_init();
output_low(GREEN_LED);

sprintf(msg, "\ntest");
RS485send(msg);


The CCS example code (directory given above) does turn on the device.
It calls the rf_powerUp() routine, as shown below. You should do this.
Try using the CCS code first.
Quote:

void main(void) {

int8 wrong_attemps;
int32 tagNum;
int8 customerCode;

rf_init(); //initialization
rf_powerUp();

// green LED on
output_low(GREEN_LED);
twoColorLED(OFF);
muiratinas



Joined: 13 Oct 2010
Posts: 16

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PostPosted: Tue Oct 19, 2010 3:11 pm     Reply with quote
Thanks for your reply,

The code I wrote is the CCS's example already (from given example book)
and yes you are right, it must be Up and I already tried it, but just making small changes to make it work, I changed it to Down and forget.

Thanks for your advice but problem still not solved with Up...
muiratinas



Joined: 13 Oct 2010
Posts: 16

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PostPosted: Wed Nov 03, 2010 2:42 am     Reply with quote
I don't want to copy and paste the ex_rfid.c, em4095.c and em4102.c from the ccs but, when i use them without changes and rfid kit, still there is no response...
When i turned the debug mode, run a bit then halt the program,
it always in
Code:
while(dataTransferred < numBits && timer0_overflows < 15);


with scope, from reader to 16f876a signals seems okay. i think i'll give up...
f0raster0



Joined: 05 Nov 2010
Posts: 22

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PostPosted: Fri Nov 05, 2010 9:28 am     Reply with quote
hi.. first my English is mm regular.. and I'm learning CCS and C for PIC.

ok... My "hi word" activate a led this very good, now I have a reader RFID, ID20 and I want to send the ID to PIC 16F887 and led activate if read a character, then all the string.

My codigo is:
Code:

#include <16F887.h>
#FUSES XT,NOWDT
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=pin_c6, rcv=pin_c7, bits=8, parity=N)
#BYTE TRISB = 0X86
#BYTE PORTB = 0X06
#BYTE OPTION_REG = 0X81


int16 a;

char value[12];//12 values of tag ID

void main()
{
     output_low(PIN_D7); //Set enable to low
     bit_clear(OPTION_REG,7);
     bit_set(TRISB,0);
     bit_clear(TRISB,1);
     bit_clear(PORTB,1);
     
     for (a=1; a<12; a++)
     
     {
          value[a]=getc();
     }
        {
   // ID of my tag Hex:    tag1: x2400CC392AFBxxx; tag2: x2400CC572897xxx
       
        if (value[2]="2")      //si valor 2 es 2, apaga led
        {
        output_high(PIN_B0);
        delay_ms(1000);
        }else
        {
        output_low(PIN_B0);
        }
 }
}


In CCS compile:

Warning 201 "rfid_1.1.c" Line 31(1,1): Assignment inside relational expression
Memory usage:ROM=1% RAM=7%-7%
0 Errors, 1 warnings


line 31 is: {
output_high(PIN_B0);
delay_ms(1000);
}else


Thanks for your time and help.
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Fri Nov 05, 2010 1:07 pm     Reply with quote
The compiler spot you WHAT and WHERE the error is:

if (value[2]="2") //si valor 2 es 2, apaga led
if (value[2]=="2") //si valor 2 es 2, apaga led

Saludos
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