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Reading Wiegand 26 Data with PIC18F46K22

 
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cllunlu



Joined: 30 Jun 2014
Posts: 4

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Reading Wiegand 26 Data with PIC18F46K22
PostPosted: Thu Jul 03, 2014 7:50 am     Reply with quote

Hi

I have a problem about reading data of wiegand 26 protocol. I am using PIC18F46K22.

Can you give a lead about this. Can you send sample codes about it. I have written code but failed.


Code is below. I wanna how many received data "0" and data "1".

I read

data0: 25 piece

data1: 1 piece.


Can you help me pls?


#include "lcd_test.c"

#zero_ram


#use delay(crystal=20000000)
#INT_EXT2
void read_wiegandD1()
{
disable_interrupts(INT_EXT2);
if(length_count<26)
{
wie_data[length_count]="1";
data1=data1+1;
length_count=length_count+1;
clear_interrupt(INT_EXT2);
enable_interrupts(INT_EXT2);
}
}


#use delay(crystal=20000000)
#INT_EXT1
void read_wiegandD0()
{
disable_interrupts(INT_EXT1);
if(length_count<26)
{
wie_data[length_count]="0";
data0=data0+1;
length_count=length_count+1;
clear_interrupt(INT_EXT1);
enable_interrupts(INT_EXT1);
}

}


#use delay(crystal=20000000)
void main()
{
board_init();
lcd_init();

lcd_gotoxy(1,1);
printf(lcd_putc, " READ CARD: ");

output_toggle(pin_d5);

delay_ms(2000);

lcd_gotoxy(1,2);
printf(lcd_putc, "CARD ID: ");
data_show();
while(TRUE)
{
output_toggle(pin_d5);
delay_ms(500);

if(length_count>25)
{
length_count=0;

output_high(pin_D5);

data_show();

delay_ms(8000);

}

}
}


#use delay(crystal=20000000)
void data_show()
{
lcd_gotoxy(1,3);
printf(lcd_putc,"Data0: %u",data0);

lcd_gotoxy(1,4);
printf(lcd_putc,"Data1: %u",data1);

}


/**************************************
Function: board_init
Input Arguments:None
Output Arguments: None
Purpose:Initialize the board
**************************************/
/*
#use delay(crystal=20000000)
void board_init(void)
{
set_tris_b(0xFF);
enable_interrupts(INT_EXT2_H2L);
enable_interrupts(INT_EXT1_H2L);
enable_interrupts(GLOBAL);

length_count=0;

}
temtronic



Joined: 01 Jul 2010
Posts: 5745
Location: Greensville,Ontario

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PostPosted: Thu Jul 03, 2014 9:41 am     Reply with quote

couple of hints..

1) when asking for help about a device or protocol you should include a 'link' to the appropriate device.Without that 'we' don't know if it's a simple 5VPIC vs 3V device problem, bus topology error(no pullups), or a coding issue(timing,polarity, etc.)

2) please use the 'code' buttons when posting code as it 'magically' makes the code a LOT easier to read! The easier you make our life, the faster we can help!

3) Please confirm the PIC does the 1Hz LED program and correctly accesses the LCD module.You don't have a needed delay_ms(500); before the lcd_init() call.

4) you have 'read card' in your code, so I'm assuming you have a 'card reader' using the protocol. PLEASE post a link to that device !

hth
jay
temtronic



Joined: 01 Jul 2010
Posts: 5745
Location: Greensville,Ontario

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PostPosted: Thu Jul 03, 2014 3:04 pm     Reply with quote

I googled 'Wiegand 26 ccs c code' and got a lot of hits...1/2 way down on first page there's a hit with working code.(according to the poster)..

I find 'googling' to be a great resource IF you type in the correct keywords.

hth
jay
Ttelmah



Joined: 11 Mar 2010
Posts: 12511

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PostPosted: Thu Jul 03, 2014 3:10 pm     Reply with quote

Several initial comments:
1) Use the code buttons.
2) Why have you got the code in 'bits', with separate clock definitions etc.?.
The clock and fuses etc., need to apply _once_.

Now I've had to make several assumptions - two line LCD?.

Code:

#include <18F46K22.h>

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES WDT128                   //Watch Dog Timer uses 1:128 Postscale
#FUSES NOBROWNOUT               //No brownout reset
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES NOMCLR

#use delay(crystal=20000000)

#include "lcd_test.c"
#define TOP_BIT 0x02000000 //first bit to handle
#define BIT_COUNT 25; //bits less one
int32 W_data=0; //store for result
int32 mask=TOP_BIT;
int8 ctr=BIT_COUNT;
int1 finished=FALSE; //flag for complete data
#define TRIGGER PIN_D5

#INT_EXT2
void read_wiegandD1(void)
{
   W_data |= mask; //set bit for a '1'
   if (ctr--==0)
   {
      finished=TRUE;
      mask=TOP_BIT;
      ctr=BIT_COUNT;
   } 
   else
      mask/=2;
}

#INT_EXT1
void read_wiegandD0(void)
{
   if (ctr--==0)
   {
      finished=TRUE;
      mask=TOP_BIT;
      ctr=BIT_COUNT;
   }
   else
      mask/=2;
}

void main(void)
{
   int1 parity1, parity2;
   int8 facility;
   int16 ID;
   delay_ms(500);
   lcd_init();
   output_high(TRIGGER);
   
   enable_interrupts(INT_EXT2_H2L);
   enable_interrupts(INT_EXT1_H2L);
   clear_interrupt(INT_EXT2);
   clear_interrupt(INT_EXT1);
   enable_interrupts(GLOBAL);

   while(TRUE)
   {
      finished=FALSE;
      mask=TOP_BIT;
      ctr=BIT_COUNT;
      W_data=0; //Initialise values
      printf(lcd_putc,"\fTriggering");
      output_low(TRIGGER);
      delay_ms(600); //The slowest a Weigand 26 sequence can be is 520mSec
      output_high(TRIGGER);
      if (finished)
      {
         parity1=bit_test(W_data,25);
         parity2=bit_test(W_data,0); //The two parity bits
         W_data/=2; //shift the 32bits right once
         ID=make16(W_data,0); //Low 16bits is then the ID
         facility=make8(W_data,2); //bits 16-23 are then the facility code.
         printf(lcd_putc,"\fID = %4LX   ",ID);
         printf(lcd_putc,"\nfacility = %2X  ",facility);
      }
      else
         printf(lcd_putc,"\fOnly %d bits seen", BIT_COUNT-ctr);
      //Now delay before asking again
      delay_ms(10000);
   }
}
cllunlu



Joined: 30 Jun 2014
Posts: 4

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PostPosted: Fri Jul 04, 2014 12:22 am     Reply with quote

Hi jay,

Thank you so much, be interested in my issue. I am trying to reading card data (UHF RFID) via Weigand 26 protocols.

http://www.aliexpress.com/item/uhf-rfid-long-range-reader-TCP-IP-ethernet-interface-free-shipping-free-sample-tags-and-cards/465350736.html.

I am student at university, I haven't more experience about it. Please Can you help?
cllunlu



Joined: 30 Jun 2014
Posts: 4

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PostPosted: Fri Jul 04, 2014 12:25 am     Reply with quote

Hi Ttelmah,

I will try your sample code. And I will write result.

Thanks you so much.

Celal
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