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Wiegand to Serial Driver

 
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chingB



Joined: 29 Dec 2003
Posts: 81

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Wiegand to Serial Driver
PostPosted: Sat Aug 12, 2006 12:53 am     Reply with quote



I hope this simple code will help.

Code:

#byte PORTB   = 0xF81    // PortB special function register

#bit  RBPU    = 0xFF1.7  // PortB pull-ups enable bit (0-enable, 1-disable)
#bit  TMR3IF  = 0xFA1.1  // Timer3 Interrupt Flag bit

#bit  INTEDG0 = 0xFF1.6  // ext0 interrupt edge select bit
#bit  INT0IF  = 0xFF2.1  // ext0 interrupt flag bit
#bit  INTEDG1 = 0xFF1.5  // ext1 interrupt edge select bit
#bit  INT1IF  = 0xFF0.0  // ext1 interrupt flag bit

#bit  DATA0   = 0xF81.0  // data0 wiegand signal
#bit  DATA1   = 0xF81.1  // data1 wiegand signal

// PortB[0..7] weak pullups macro
#define ENABLE_PULLUPS()      RBPU=0    // enable weak pullups on PortB
#define DISABLE_PULLUPS()     RBPU=1    // disable weak pullups on PortB

#define TX_SIZE 64               // RS485 TX data size
byte TXbuffer[TX_SIZE];          // RS485 TX buffer
byte TXin  = 0;                  // RS485 TX data IN index
byte TXout = 0;                  // RS485 TX data OUT index

int1 gltmr3f    = 0;
int1 glprocessf = 0;
int1 gldata0f   = 0;
int1 gldata1f   = 0;

unsigned int8  siteCode    = 0;
unsigned int16 idCode      = 0;
unsigned int32 wiegandData = 0;


Code:

#int_ext    // Data0 external interrupt
void data0_isr()
{
   if (!gldata0f)
      wiegandData <<= 1;
   
   if (!gltmr3f){
      set_timer3(30536);
      clear_interrupt(int_timer3);
      enable_interrupts(int_timer3);
      gltmr3f = 1;
   }
}

#int_ext1   // Data1 external interrupt
void data1_isr()
{
   if (!gldata1f){
      wiegandData <<= 1;
      wiegandData |= 1;
   }
   
   if (!gltmr3f){
      set_timer3(30536);
      clear_interrupt(int_timer3);
      enable_interrupts(int_timer3);
      gltmr3f = 1;
   }
}

#int_timer3 // 3mSec. timeout
void timer3_isr()
{
   disable_interrupts(int_timer3);
   glprocessf = 1;
   gldata0f = 1;
   gldata1f = 1;
}

#int_tbe
void Serial_TX_isr()
{
   putc(TXbuffer[TXout]);           // put char to TXbuffer then send
   TXout=(TXout+1) % TX_SIZE;       // increment & limit to max buffer size
   if(TXin==TXout)                  // if last in data, stop RS485 TX interrupt
     disable_interrupts(int_tbe);   // disable transmit interrupt
}
Code:

void bputc(char c)                  // bufferred putc routine
{
   short restart;                   // restart flag
   int ni;                          // temp variable

   restart=TXin==TXout;             // set restart flag at start
   TXbuffer[TXin]=c;                // store char to TXbuffer
   ni=(TXin+1) % TX_SIZE;           // limit to max buffer size
   while(ni==TXout);
   TXin=ni;
   if(restart)                      // enable TX interrupt
     enable_interrupts(int_tbe);
}

int1 check_Parity(unsigned int8 index,unsigned int32 wgCode)
{
   int1 pResult   =0;
   unsigned int8 i=0;

   for (i=index; i<index>>16) & 0xFF;
               printf(bputc,"\r\nSite Code = %U ** ID Code = %LU \r\n",siteCode,idCode);
               wiegandData = 0;
            }
         }
         gldata0f = 0;
         gldata1f = 0;
         gltmr3f = 0;
      }
   }
}


Enjoy... =P
Newbaby



Joined: 12 Aug 2006
Posts: 1

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Wiegand to Serial Driver
PostPosted: Sat Aug 12, 2006 2:49 am     Reply with quote

Hi ChingB,

Could you put an example code to show how to use your driver please
chingB



Joined: 29 Dec 2003
Posts: 81

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Re: Wiegand to Serial Driver
PostPosted: Sun Aug 13, 2006 2:21 am     Reply with quote

Newbaby wrote:
Hi ChingB,

Could you put an example code to show how to use your driver please


Below is the complete code listing:
Code:

#byte PORTB   = 0xF81    // PortB special function register

#bit  RBPU    = 0xFF1.7  // PortB pull-ups enable bit (0-enable, 1-disable)
#bit  TMR3IF  = 0xFA1.1  // Timer3 Interrupt Flag bit

#bit  INTEDG0 = 0xFF1.6  // ext0 interrupt edge select bit
#bit  INT0IF  = 0xFF2.1  // ext0 interrupt flag bit
#bit  INTEDG1 = 0xFF1.5  // ext1 interrupt edge select bit
#bit  INT1IF  = 0xFF0.0  // ext1 interrupt flag bit

#bit  DATA0   = 0xF81.0  // data0 wiegand signal
#bit  DATA1   = 0xF81.1  // data1 wiegand signal

// PortB[0..7] weak pullups macro
#define ENABLE_PULLUPS()      RBPU=0    // enable weak pullups on PortB
#define DISABLE_PULLUPS()     RBPU=1    // disable weak pullups on PortB

#define TX_SIZE 64               // RS485 TX data size
byte TXbuffer[TX_SIZE];          // RS485 TX buffer
byte TXin  = 0;                  // RS485 TX data IN index
byte TXout = 0;                  // RS485 TX data OUT index

int1 gltmr3f    = 0;
int1 glprocessf = 0;
int1 gldata0f   = 0;
int1 gldata1f   = 0;

unsigned int8  siteCode    = 0;
unsigned int16 idCode      = 0;
unsigned int32 wiegandData = 0;

#int_ext    // Data0 external interrupt
void data0_isr()
{
   if (!gldata0f)
      wiegandData <<= 1;
   
   if (!gltmr3f){
      set_timer3(30536);
      clear_interrupt(int_timer3);
      enable_interrupts(int_timer3);
      gltmr3f = 1;
   }
}

#int_ext1   // Data1 external interrupt
void data1_isr()
{
   if (!gldata1f){
      wiegandData <<= 1;
      wiegandData |= 1;
   }
   
   if (!gltmr3f){
      set_timer3(30536);
      clear_interrupt(int_timer3);
      enable_interrupts(int_timer3);
      gltmr3f = 1;
   }
}

#int_timer3 // 3mSec. timeout
void timer3_isr()
{
   disable_interrupts(int_timer3);
   glprocessf = 1;
   gldata0f = 1;
   gldata1f = 1;
}

#int_tbe
void Serial_TX_isr()
{
   putc(TXbuffer[TXout]);           // put char to TXbuffer then send
   TXout=(TXout+1) % TX_SIZE;       // increment & limit to max buffer size
   if(TXin==TXout)                  // if last in data, stop RS485 TX interrupt
     disable_interrupts(int_tbe);   // disable transmit interrupt
}

void bputc(char c)                  // bufferred putc routine
{
   short restart;                   // restart flag
   int ni;                          // temp variable

   restart=TXin==TXout;             // set restart flag at start
   TXbuffer[TXin]=c;                // store char to TXbuffer
   ni=(TXin+1) % TX_SIZE;           // limit to max buffer size
   while(ni==TXout);
   TXin=ni;
   if(restart)                      // enable TX interrupt
     enable_interrupts(int_tbe);
}



I got a problem of posting the entire code. I'll post it on a separate reply for the example on how I use it.

--
chingB



Joined: 29 Dec 2003
Posts: 81

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Re: Wiegand to Serial Driver
PostPosted: Sun Aug 13, 2006 2:40 am     Reply with quote

Newbaby wrote:
Hi ChingB,

Could you put an example code to show how to use your driver please


Code:

int1 check_Parity(unsigned int8 index,unsigned int32 wgCode)
{
   int1 pResult   =0;
   unsigned int8 i=0;

   for (i=index; i<(index+13); i++)
      pResult ^= bit_test(wgCode,i);

   return(pResult);     
}
chingB



Joined: 29 Dec 2003
Posts: 81

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PostPosted: Sun Aug 13, 2006 2:42 am     Reply with quote

Below is the listing for the Main Program

Code:

void init_mcu() // MCU Initialization Routine
{
   delay_ms(4000); // delay for 4 seconds (stabilized MCU?)

   // B0 & B1 are conficured as input
   // the reset of PortB I/O are set to output
   set_tris_b(0x03); // set PortB I/O directions
   ENABLE_PULLUPS(); // enable weak pullups for PortB[0..7]

   INTEDG0 = 0;      // set to falling edge (External-0 Interrupt)
   INT0IF  = 0;      // clear ext0 interrupt flag
   INTEDG1 = 0;      // set to falling edge (External-2 Interrupt)
   INT1IF  = 0;      // clear ext2 interrupt flag
   TMR3IF  = 0;   // clear timer3 Interrupt flag

   setup_adc_ports(NO_ANALOGS); // setup PortA to digital I/O
   
   setup_timer_3(T3_INTERNAL | T3_DIV_BY_8); // 104.8576mSec. timer overflow

   enable_interrupts(int_ext);
   enable_interrupts(int_ext1);
   enable_interrupts(global);   // enable global interrupt
}

//------------------
// Main Program
//------------------
main()
{
   init_mcu();                 // initialize MCU


   while (TRUE)
   {
      if (glprocessf)
      {
         glprocessf = 0;
         //printf("\r\nWiegand Data = %LX\r\n",wiegandData);
         if (check_Parity(0,wiegandData) == 1)        // odd parity
         {
            if (check_Parity(13,wiegandData) == 0){   // even parity
               idCode = wiegandData & 0xFFFF;
               siteCode = (wiegandData>>16) & 0xFF;
               printf(bputc,"\r\nSite Code = %U ** ID Code = %LU \r\n",siteCode,idCode);
               wiegandData = 0;
            }
         }
         gldata0f = 0;
         gldata1f = 0;
         gltmr3f = 0;
      }
   }
}


=P
jrgob



Joined: 21 Jan 2010
Posts: 10
Location: Brazil

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PostPosted: Fri Jul 01, 2011 8:36 am     Reply with quote

Hello ChingB...

I understand your software, the data is received for connverter wiegand protocol for serial ...

I have some questions:

1) It is a generic code, suitable for any pic?
2) The protocol format is receiving wiegand 26? or receive any wiegand format?

I need to make a protocol wiegand converter for RS232 ... I know if you can help me.
_________________
Thanks.

jrgob
cllunlu



Joined: 30 Jun 2014
Posts: 4

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PostPosted: Mon Jun 30, 2014 1:59 am     Reply with quote

I have project that reading data with wiegand 26 protocol. I am using PIC18F46K22 and CCS C. Compiler version 5.0.13.

I have used this code. But I failed. I wanna ask, why we use timer? Using external interrupt for Data0 and Data1 is not enough?

Can you please help about it?

Thanks
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