RF-ID uygulaması (PIC16F88 SN75176 CCS)

Selam arkadaşlar sizinle yapmış olduğum rfi-id uygulamasını paylaşıyorum. Uygulama eğitim amaçlı ve örnek niteliğinde olup geliştirilmeye müsaittir. Uygulamadan bahsedecek olursak denetleyici olarak PIC16F88 kullanılmıştır. PIC16F88 piyasada rahat bulunan PIC16F628A ile pek fiyat farkı bulunmayan 16f628`den daha marifetli bir denetleyicidir.

RF-ID Devre şeması

Devre EM4100 diye tabir edilen 125khz rf-id kartlarını okuyup okuduğu bilgileri seri olarak gönderir. haberleşme için baskı devre üzerinde rs485 devresi vardır isteyen iptal edip RS232 olarak kullanabilir. Devre okuduğu kart bilgisini gönderdikten sonra 5 saniye boyunca cevap bilgisi bekler gelen cevap ‘E‘ ise yeşil led yanar buzzer ve röle 1 saniye çalışır. Farklı bir cevap veya 5 saniye boyunca hiç bir cevap gelmez ise kırmızı led ve buzzer kesik olarak iki kere uyarı verir.Devre üzerinde iki led buzzer ve röle vardır.

Ayrıca pc üzerinde alınan kodları okumak ve cevap göndermek için delphi 7 ile küçük bir arayüz hazırladım onunla devreyi test edebilirsiniz.16F88 için kodlar CCS C ile yazılmıştır.

Son olarak devre üzerindeki rf-id okuyucu modül mikro elektronikanın modülüdür. Yurt içi veya yurt dışından temin edilebilir. Modül üzerindeki çip EM4095 tir. Faydalı olması dileğiyle.

Projenin kaynak kod, isis ve program dosyaları ( Dosya şifresi-pass: tekniker_erhan ) RF-ID-reader-PIC16F88.rar

CCS C rfid reader.c yazılım içeriği

///////////////////////////////////////////////////////////////////////////////
//// Proje:PIC16F88 ile RF-ID okuyucu uygulaması                           ////
//// Projeyi yapan:Erhan Yılmaz(tekniker_erhan)                            ////
//// E-mail:erhan_yilmazz@hotmail.com                                      ////
//// Tarih:22-06-2009 Pazartesi                                            ////
//// Version 1.0                                                           ////
//// Not:Proje eğitim amaçlı ve RF-ID uygulamaları ile örnek niteliğinde   ////
//// olup geliştirilmeye müsaittir.                                        ////
///////////////////////////////////////////////////////////////////////////////
#include  <16F88.h>
#fuses XT,NOWDT,NOPROTECT,NOLVP,NOBROWNOUT,PUT,CCPB3,NOMCLR
#use delay(clock=4000000)
#include 
#include 
#use rs232 (baud=9600, xmit=pin_B5, rcv=pin_B2, parity=N, stop=1)
#define RF_RDY_CLK   PIN_B6
#define RF_SHD       PIN_B1
#define RF_MOD       PIN_B4
#define RF_DEMOD_OUT PIN_B3
#define k_led PIN_A2
#define y_led PIN_A3
#define buzzer PIN_B7
#define role PIN_A1

unsigned int8 code[5];
unsigned int8 cevap;
void yanlis(void){
        output_high(k_led);
        output_high(buzzer);
        delay_ms(200);
        output_low(k_led);
        output_low(buzzer);
        delay_ms(200);
        output_high(k_led);
        output_high(buzzer);
        delay_ms(200);
        output_low(k_led);
        output_low(buzzer);
        }

void dogru (void){
        output_high(y_led);
        output_high(role);
        output_high(buzzer);
        delay_ms(1000);
        output_low(y_led);
        output_low(role);
        output_low(buzzer);
        }

void kontrol(int8){
   if(cevap=='E'){dogru();}
   else{yanlis();}}

void main(void) {
int16 i;
   setup_adc_ports(NO_ANALOGS);
   setup_comparator(NC_NC_NC_NC);
   rf_init(); 

   while(1) {

        if(read_4102(code)){
        disable_interrupts(global);
        output_high(y_led);
        output_high(buzzer);
        delay_ms(200);
        output_low(y_led);
        output_low(buzzer);
        printf("%X-%X-%X-%X-%X"code[0],code[1],code[2],code[3],code[4]);
        cevap='H';
        for(i=0;i<=5000;i++){
        if (kbhit()){
        cevap=getch();
        break;}
        delay_ms(1);}
        kontrol(cevap);
        enable_interrupts(global);
        }
     }
}

CCS C em4095_read.c yazılım içeriği

/////////////////////////////////////////////////////////////////////////
////                             em4095_read.c                       ////
//// This file contains drivers for a EM4095 RFID basestation.       ////
////                                                                 ////
/////////////////////////////////////////////////////////////////////////
////                                                                 ////
////                          Pin Layout                             ////
////   ------------------------------------------------------------  ////
////   |                                                          |  ////
////   | 1: VSS       GND         | 16: DC2                       |  ////
////   |                          |                               |  ////
////   | 2: RDY/CLK   RF_RDY_CLK  | 15: FCAP                      |  ////
////   |                          |                               |  ////
////   | 3: ANT1                  | 14: SHD         RF_SHD        |  ////
////   |                          |                               |  ////
////   | 4: DVDD                  | 13: DEMOD_OUT   RF_DEMOD_OUT  |  ////
////   |                          |                               |  ////
////   | 5: DVDS                  | 12: MOD         RF_MOD        |  ////
////   |                          |                               |  ////
////   | 6: ANT2                  | 11: AGND                      |  ////
////   |                          |                               |  ////
////   | 7: VDD       +5V         | 10: CDEC_IN                   |  ////
////   |                          |                               |  ////
////   | 8: DMOD_IN               |  9: CDEC_OUT                  |  ////
////   ------------------------------------------------------------  ////
////                                                                 ////
/////////////////////////////////////////////////////////////////////////

#ifndef EM4095
#define EM4095

#ifndef RF_SHD
#define RF_RDY_CLK   PIN_B6         // External interrupt used to read clock
#define RF_SHD       PIN_B1         // High disables the antenna signal
#define RF_MOD       PIN_B4         // High does 100% modulation
#define RF_DEMOD_OUT PIN_B3         // Data read in interrupt service routine
#endif

// Provide a buffer for storing recieved data and data to be sent
#define RFBUFFER_SIZE 20
int8 RFbuffer[RFBUFFER_SIZE];
int8 RFbuffer_index = 0;
int8 RFbuffer_bitIndex = 0;
#define END_OF_RFBUFFER (RFbuffer_index == sizeof(RFbuffer))

/////////////////////////////////////////////////////////////////////////
//// Read modes available for reading data from a transponder
/////////////////////////////////////////////////////////////////////////
int8 RF_readMode;
#define RF_MANCHESTER_DATA    0     // Reads Manchester encoded data
#define RF_MEASURE_WIDTHS     1     // Measure a series of widths
#define RF_FIND_WIDTH         2     // Find a specific width
#define RF_FIND_PATTERN       3     // Find a pattern of widths
/////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////
//// Global Variables
/////////////////////////////////////////////////////////////////////////
int1  bitValue              = 1;
int1  storeData             = TRUE;
int1  RE_FE_TOGGLE          = 1;
int1  RF_widthFound         = FALSE;
int1  RF_patternFound       = FALSE;
int8  RF_widthToFind        = 0;
int8* RF_findWidths         = 0;
int8  RF_uncertainty        = 0;
int8  timer0_overflows      = 0;
int8  dataTransferred       = 0;
int16 old_clock             = 0;
/////////////////////////////////////////////////////////////////////////

// Purpose:       Initializes the 4095 into sleep mode
//                Sets up the timers and interrupts
void rf_init()
{
   output_low(RF_SHD);
   output_low(RF_MOD);

   setup_timer_1(T1_EXTERNAL | T1_DIV_BY_1);
   setup_ccp1(CCP_CAPTURE_RE);
   //setup_ccp2(CCP_COMPARE_INT);

   setup_timer_0(RTCC_INTERNAL | RTCC_DIV_256 | RTCC_8_BIT);
   enable_interrupts(INT_RTCC);
   enable_interrupts(GLOBAL);
}

// Purpose:       Powers down the RF antenna
//#define rf_powerDown()  output_high(RF_SHD);

// Purpose:       Powers up the RF antenna
//#define rf_powerUp()    output_low(RF_SHD);

// Purpose:       Select which edge to begin reading data
void RF_readEdge(int1 edge)
{
   if(edge)
   {
      setup_ccp1(CCP_CAPTURE_RE);
      RE_FE_TOGGLE = 1;
   }
   else
   {
      setup_ccp1(CCP_CAPTURE_FE);
      RE_FE_TOGGLE = 0;
   }
}

// Purpose:       Interrupt service routine to handle compare 1 interrupts.
//                Reads incoming data from a transponder and stores it in
//                the global buffer.
#INT_CCP1
void isr_ccp1()
{
   int8  width;

   // Toggle between capturing rising and falling edges to meausure width
   if(RE_FE_TOGGLE)
   {
      setup_ccp1(CCP_CAPTURE_FE);
      RE_FE_TOGGLE = 0;
   }
   else
   {
      setup_ccp1(CCP_CAPTURE_RE);
      RE_FE_TOGGLE = 1;
   }

   // Calculate the width
   width = CCP_1 - old_clock;
   old_clock = CCP_1;

   switch(RF_readMode)
   {
      // Use to receive manchester formatted data from a transponder
      case RF_MANCHESTER_DATA:
      {
         if(width > 54)           // Check for a phase change
         {
            bitValue = ~bitValue; // Invert the save bit value
            storeData = TRUE;     // Force a bit store
         }

         if(storeData)
         {
            shift_right(RFbuffer+RFbuffer_index, 1, bitValue);
            ++dataTransferred;

            if(++RFbuffer_bitIndex == 8 )
            {
               RFbuffer_bitIndex = 0;
               ++RFbuffer_index;
            }
         }

         storeData = ~storeData;
         break;
      }

      // Use to read high and low widths
      case RF_MEASURE_WIDTHS:
      {
         RFbuffer[RFbuffer_index++] = width;
         ++dataTransferred;

         break;
      }

      // Use to search for a certain pulse width
      case RF_FIND_WIDTH:
      {
         if(width > (RF_widthToFind - RF_uncertainty)
         && width < (RF_widthToFind + RF_uncertainty))
         {
            RF_widthFound = TRUE;
         }
         break;
      }

      case RF_FIND_PATTERN:
      {
         if(width > RF_findWidths[RFbuffer_index] - RF_uncertainty
         && width < RF_findWidths[RFbuffer_index] + RF_uncertainty)
         {
            if(++RFbuffer_index == dataTransferred)
            {
               RF_patternFound = TRUE;
            }
         }
         else
         {
            if(RFbuffer_index > 0)
            {
               int8 pos, i, j;
               pos = RFbuffer_index-1;   // Save the initial position

               // Try to match partial pattern
               while(--RFbuffer_index != 0)
               {
                  if(width > RF_findWidths[RFbuffer_index] - RF_uncertainty
                  && width < RF_findWidths[RFbuffer_index] + RF_uncertainty)
                  {
                     for(i=pos, j=RFbuffer_index-1; j!=255; --i, --j)
                     {
                        if(RF_findWidths[j] != RF_findWidths[i])
                        {
                           break;
                        }
                     }
                     if(j == 255)
                     {
                        break;
                     }
                  }
               }
            }
         }
         break;
      }
   }
}

// Purpose:       This interrupt service routine is used
//                to send data to a transponder
// Inputs:        None
// Outputs:       None

// Purpose:       Interrupt for timer 0. Keeps track of the number of
//                overflows for timeouts.
// Inputs:        None
// Outputs:       None
#INT_RTCC
void isr_rtcc()
{
   ++timer0_overflows;
}

// Purpose:       Fill the buffer with data read from the basestation
// Inputs:        1) The number of bits to read
//                2) TRUE start on rising edge
//                   FALSE start on falling edge
// Outputs:       The number of bits read. Could be used to check for timeout
int8 RF_get(int8 numBits, int1 edge)
{
   RF_readEdge(edge);
   RF_readMode = RF_MANCHESTER_DATA;

   storeData         = TRUE;
   bitValue          = 0;
   RFbuffer_index    = 0;
   RFbuffer_bitIndex = 0;
   dataTransferred   = 0;
   timer0_overflows  = 0;
   old_clock         = 0;
   set_timer1(0);

   clear_interrupt(INT_CCP1);
   enable_interrupts(INT_CCP1);
   while(dataTransferred < numBits && timer0_overflows < 15);
   disable_interrupts(INT_CCP1);

   RFbuffer_index = 0;
   RFbuffer_bitIndex = 0;

   return dataTransferred;
}

// Purpose:       Send data from the buffer to the transponder
// Inputs:        1) Send numBits of data to the transponder
//                2) The index in the buffer to start at
//                3) The bit position at the index to start at
// Outputs:       None

// Purpose:       Search for a certain pulse width
// Inputs:        1) The width length in clocks
//                2) Uncertainty to search over a range
//                3) TRUE start on rising edge
//                   FALSE start on falling edge
//                ex) numClocks = 128; uncertainty = 6; range = 122 to 134
// Outputs:       TRUE if width was found, FALSE if not found
int1 RF_findWidth(int8 numClocks, int8 uncertainty, int1 edge)
{
   RF_readEdge(edge);

   RF_readMode          = RF_FIND_WIDTH;
   RF_widthToFind       = numClocks;
   RF_widthFound        = FALSE;
   RF_uncertainty       = uncertainty;
   timer0_overflows     = 0;
   old_clock            = 0;
   set_timer1(0);

   clear_interrupt(INT_CCP1);
   enable_interrupts(INT_CCP1);
   while(RF_widthFound == FALSE && timer0_overflows < 50);
   disable_interrupts(INT_CCP1);

   return RF_widthFound;
}

// Purpose:    Measure a number of pulse widths, both high and low
// Inputs:     1) The number of widths to measure
//             2) TRUE start on rising edge
//                FALSE start on falling edge
// Outputs:    The number of widths that were measured. If there is
//             no transponder in range, the timeout could occur.
int8 RF_measureWidths(int8 numWidths, int1 edge)
{
   RF_readEdge(edge);

   RF_readMode       = RF_MEASURE_WIDTHS;
   dataTransferred   = 0;
   RFbuffer_index    = 0;
   timer0_overflows  = 0;
   old_clock         = 0;
   set_timer1(0);

   clear_interrupt(INT_CCP1);
   enable_interrupts(INT_CCP1);
   while(dataTransferred < numWidths && timer0_overflows < 50);
   disable_interrupts(INT_CCP1);

   return dataTransferred;
}

// Purpose:    Measure a number of pulse widths, both high and low
// Inputs:     1) A pointer to an array of widths. It is safe to use RFbuffer.
//             2) The number of widths in the pattern
//             3) Uncertainty to search over a range
//             4) TRUE start on rising edge
//                FALSE start on falling edge
// Outputs:    The number of widths that were measured. If there is
//             no transponder in range, the timeout could occur.
int8 RF_findPattern(int8* widths, int8 numWidths, int8 uncertainty, int1 edge)
{
   RF_readEdge(edge);

   RF_readMode       = RF_FIND_PATTERN;
   RF_patternFound   = FALSE;
   RFbuffer_index    = 0;
   RF_findWidths     = widths;
   dataTransferred   = numWidths;
   RF_uncertainty    = uncertainty;
   timer0_overflows  = 0;
   old_clock         = 0;
   set_timer1(0);

   clear_interrupt(INT_CCP1);
   enable_interrupts(INT_CCP1);
   while(RF_patternFound == FALSE && timer0_overflows < 40);
   disable_interrupts(INT_CCP1);

   return RF_patternFound;
}

// Purpose:       Set every byte in the buffer to data
// Inputs:        None
// Outputs:       None
void RFbuffer_fill(int8 data)
{
   int i;

   for(i=0; i= 8 )
      {
         ++RFbuffer_index;
         RFbuffer_bitIndex = 0;
      }
   }
}

// Purpose:       Set the value of the next byte in the buffer
// Inputs:        None
// Outputs:       None
void RFbuffer_setByte(int8 data)
{
   if(!END_OF_RFBUFFER)
   {
      int8 i;
      for(i=0; i<8; ++i)
      {
         RFbuffer_setBit(bit_test(data, 7));
         rotate_left(&data, 1);
      }
   }
}

#endif