// Capture1.C
//
// Capture the time of a rising edge on RC2
//
// Interrupts
//   Timer0:  Time measured to 100ns
//   Timer1:  Time measured to 100ns
//   Capture1:  Rising edge on RC2
//



#include <pic18.h>

// Global Variables
unsigned long int TIME, TIME1;
const unsigned char MSG0[21] = "T1 Capture1          "; 

// Interrupt Service Routine

void interrupt IntServe(void) 
{
   if (TMR0IF) {
      TMR0 = -10000;
      RC0 = !RC0;
      TMR0IF = 0;
      }
   if (TMR1IF) {
      TIME = TIME + 0x10000;
      TMR1IF = 0;
      }   
   if (CCP1IF) {
      TIME1 = TIME + CCPR1;
      CCP1IF = 0;
      }   
   }

// Subroutines
#include        "lcd_portd.c"



// Main Routine

void main(void)
{
   unsigned int i;
   TRISA = 0;
   TRISB = 0xFF;
   TRISC = 0x04;	// capture every rising edge
   TRISD = 0;
   ADCON1 = 0x0F;
 
// set up Timer0 for PS = 1
   T0CS = 0;
   T0CON = 0x88;
   TMR0ON = 1;
   TMR0IE = 1;
   TMR0IP = 1;
   PEIE = 1;
// set up Timer1 for PS = 1
   TMR1CS = 0;
   T1CON = 0x81;
   TMR1ON = 1;
   TMR1IE = 1;
   TMR1IP = 1;
   PEIE = 1;
// set up Capture1 for rising edges
   TRISC2 = 1;
   CCP1CON = 0x05;
   CCP1IE = 1;
   PEIE = 1;

   LCD_Init();           
   LCD_Move(0,0);  for (i=0; i<20; i++) LCD_Write(MSG0[i]);
   Wait_ms(1000);

   TIME = 0;

// turn on all interrupts
   GIE = 1;
   
   while(1) {
      LCD_Move(0,0);  LCD_Out(TIME + TMR1, 10, 7);
      LCD_Move(1,0);  LCD_Out(TIME1, 10, 7);
      }
   }