#include	<spi.h>
#include	<xlcd.h>
#include	<p18f452.h>
#include	<timers.h>
#include	<delays.h>
#include	<stdlib.h>
#include	<string.h>

/* Set configuration bits for use with ICD2 / PICDEM2 PLUS Demo Board:
 * - set HS oscillator
 * - disable watchdog timer
 * - disable low voltage programming
 */
#pragma config OSC = HS
#pragma config WDT = OFF
#pragma config LVP = OFF

#pragma udata
int ovrflw_count=0;              /*global variable*/
#define CLEAR_DISPLAY	0x01

void DelayFor18TCY(void);
void DelayPORXLCD(void);
void DelayXLCD(void);
void clear_lcd(int line);
void low_isr(void);
void high_isr(void);


#pragma code low_vector=0x18
void interrupt_at_low_vector(void) { _asm GOTO low_isr _endasm }
#pragma code /* return to the default code section */
//#pragma interruptlow low_isr save=PROD


/*
 *  Low Interrupt Subroutine
 */

void low_isr(void) {
    ovrflw_count++;
    INTCONbits.TMR0IF = 0;
    return;
}



/*
 *             MAIN
 */


void main (void)
{
  
  unsigned long int tmr;
  int i;
  char data_tmr[32];
  char data_count[6];


  TRISB=0b00000010;
  PORTB=0;

  TRISC=0b00000110;
  
  OpenXLCD(FOUR_BIT & LINES_5X7);		// Init the LCD Display
  while(BusyXLCD()); 
  WriteCmdXLCD(DON&CURSOR_OFF&BLINK_OFF);
  WriteDataXLCD('6');


  while (PORTCbits.RC1==0);   /*wait for signal from transmitter*/
    
  PORTB=4;

  OpenTimer0( TIMER_INT_ON &
               T0_16BIT &
               T0_SOURCE_INT &
               T0_PS_1_1 );
  INTCONbits.GIE = 1;

  while (PORTCbits.RC2==0);  /*wait for signal from reciever*/
 
  CloseTimer0;
  tmr = ReadTimer0();
  

  OpenXLCD(FOUR_BIT & LINES_5X7);		// Init the LCD Display
  while(BusyXLCD()); 
  WriteCmdXLCD(DON&CURSOR_OFF&BLINK_OFF);

  WriteDataXLCD('3');

  ultoa(tmr,data_tmr);
  itoa(ovrflw_count,data_count);

  for (i=0;i<strlen(data_count);i++) 
  {
    WriteDataXLCD(data_count[i]);
  }

  WriteDataXLCD(' ');

  for (i=0;i<strlen(data_tmr);i++) 
  {
    WriteDataXLCD(data_tmr[i]);
  }

  PORTB++;
  
  while (1);

}



void clear_lcd(int line)
{
    char ln;
    int x;

    if (line==2) ln = 0xC0;
    else ln = 0x00;

    while( BusyXLCD() ); 
    SetDDRamAddr(ln);   // set line
    for (x=0; x<16; x++)
    {
        while( BusyXLCD() ); 
        WriteDataXLCD(' ');		// write a blank
    }
    while( BusyXLCD() ); 
    SetDDRamAddr(ln);   // set back to beginning
    return;
}