// T2 PWM
//
// Output a PWM signal on PORTC

// Global Variables

const unsigned char MSG0[21] = "T2  PWM             "; 
unsigned char PWM, N;

// Subroutine Declarations
#include <pic18.h>

// Subroutines
#include        "lcd_portd.c"

// High-priority service
void interrupt IntServe(void)
{
   if (TMR2IF) {
      N = (N + 1) % 64;
      if (N < PWM) PORTC = 0x3F;
      else PORTC = 0;
      if(N == 0) RA1 = !RA1;
      TMR2IF = 0;
      }
   }

// Main Routine

void main(void)
{
   unsigned char i;
   unsigned int j;

   TRISA = 0;
   TRISB = 0xFF;
   TRISC = 0;
   TRISD = 0;
   TRISE = 0;
   ADCON1 = 0x0F;

   LCD_Init();                  // initialize the LCD

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

// set up Timer2 for 200 clocks
   T2CON = 0x04;
   PR2 = 199;
   TMR2ON = 1;
   TMR2IE = 1;
   TMR2IP = 1;
   PEIE = 1;

   PWM = 10;

// turn on all interrupts
   GIE = 1;

   while(1) {
      if(RB0) PWM = 0;
      if(RB1) PWM = 9;
      if(RB2) PWM = 18;
      if(RB3) PWM = 27;
      if(RB4) PWM = 36;
      if(RB5) PWM = 45;
      if(RB6) PWM = 54;
      if(RB7) PWM = 64;
      LCD_Move(1,0);  LCD_Out(PWM, 3, 0);
      }     
   }