Help: RFID and serLCD

hey,

i new arduino , products 1 of friends @ university got me it, , using uni project.

i using serial enabled lcd seeeduino ( backpack (http://littlebirdelectronics.com/products/serial-enabled-lcd-backpack) , normal 2x16 5v lcd screen attached) , rfid module (http://littlebirdelectronics.com/products/125khz-rfid-module-uart).

i have got both code of these elements working on own, internet, struggling them work together.

i not sure issue is. stops working when include lcd coding, including lcd.begin etc.

at moment trying make lcd output value of rfid card.

thanks in advance!
willing read have throw @ me!

code: [select]


#include <softwareserial.h>

softwareserial rfid = softwareserial(2, 2);
softwareserial lcd = softwareserial(0, 3);

const int lcddelay=100;

void lcdposition(int row, int col)
{
  lcd.write(0xfe);   //command flag
  lcd.write((col + row*64 + 128));    //position
  delay(lcddelay);
}

void clearlcd()
{
  lcd.write(0xfe);   //command flag
  lcd.write(0x01);   //clear command.
  delay(lcddelay);
}

void backlighton()
{  //turns on backlight
  lcd.write(0x7c);   //command flag backlight stuff
  lcd.write(157);    //light level.
  delay(lcddelay);
}

void backlightoff()
{  //turns off backlight
  lcd.write(0x7c);   //command flag backlight stuff
  lcd.write(128);     //light level off.
   delay(lcddelay);
}

void sercommand()
{   //a general function call command flag issuing other commands   
  lcd.write(0xfe);
}

void setup()
{
  pinmode(3, output);
  serial.begin(9600);
  rfid.begin(9600);
  lcd.begin(9600);      // maximum bandwidth issue
}

void loop()
{
  receiverfidcardinfo();
}

void receiverfidcardinfo()
{
  static byte data[4];
  static byte temp[14];
  byte len;
  static int = 0;
  unsigned long currentid;
  if(rfid.available())
  {
      temp[i++] = rfid.read();
      if(14 == i)
      {
        if( 0x02 == temp[0] && 0x03 == temp[13])
        {
          data[0] = transform(temp[3])*16 + transform(temp[4]);
          data[1] = transform(temp[5])*16 + transform(temp[6]);
          data[2] = transform(temp[7])*16 + transform(temp[8]);
          data[3] = transform(temp[9])*16 + transform(temp[10]);
          currentid = (unsigned long)data[0]*16777216 + (unsigned long)data[1]*65536 + (unsigned long)data[2]*256 + (unsigned long)data[3];
          serial.println("\ncurrentid:");
          serial.print(currentid,dec);
          i=0;
         
          clearlcd();
          lcdposition(0,0);
          lcd.print(currentid, dec);
        }
      }
  }
}

byte transform(byte dat)
{
  if(dat >= 0x30 && dat <= 0x39)
  {
    return (dat - 0x30);
  }else if(dat >= 0x41 && dat <= 0x46)
  {
    return (dat - 55);
  }
}


code: [select]

softwareserial rfid = softwareserial(2, 2);
do have tx pin of rfid connected same arduino pin rx pin? that's unusual way of doing things.

code: [select]

softwareserial lcd = softwareserial(0, 3);
using hardware serial pin softwareserial bad idea.

code: [select]

void loop()
{
  receiverfidcardinfo();
}
why?

code: [select]

void receiverfidcardinfo()
{
  static byte data[4];
  static byte temp[14];
  byte len;
  static int = 0;
  unsigned long currentid;
  if(rfid.available())
  {

why data , temp static? why static?

looks forgot put rfid in listen mode.

code: [select]

          currentid = (unsigned long)data[0]*16777216 + (unsigned long)data[1]*65536 + (unsigned long)data[2]*256 + (unsigned long)data[3];
bit shifting more efficient.

code: [select]

  if(dat >= 0x30 && dat <= 0x39)
  {
    return (dat - 0x30);
  }else if(dat >= 0x41 && dat <= 0x46)
  {
    return (dat - 55);
  }
what's magic numbers? why mix of hex , decimal?

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