/********************************************************************
* FileName:        timers using blocking code.c
* Processor:       PIC18F4520
* Compiler:        MPLAB C18 v.3.06 
*
* This file shows the basic syntax for using Timer 0
*
* Author               Date        Comment
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
// David Fisher


/** Header Files *****************************************/     
#include <p18f4520.h> 
#include <timers.h>

/** Define Constants Here ******************************************/

/** Local Function Prototypes **************************************/

// Configuration Bits 
#pragma config OSC = INTIO67  
#pragma config WDT = OFF
#pragma config LVP = OFF
#pragma config BOREN = OFF
#pragma config XINST = OFF

/** Global Variables *********************************************/
	
/*****************************************************************
* Function:        void main(void)
******************************************************************/
#pragma code

void main (void)
{
	// Run the clock at 500 kHz
	OSCCONbits.IRCF2 = 0;
	OSCCONbits.IRCF1 = 1;
	OSCCONbits.IRCF0 = 1;
	
	// Setup the time with a 1:32 prescaler
	OpenTimer0( TIMER_INT_OFF & T0_16BIT & T0_SOURCE_INT & T0_PS_1_32 );
	
	// Therefore the timer0 freq is 500 kHz / 4 / 32 = 3906 Hz = 256 uSeconds

	ADCON1 = 0x0F;
	TRISB = 0x00;
	PORTB = 0x00;
	
	while (1)
    {
		WriteTimer0(0x0000);
	    PORTB = 0x01;
		// Let's say I want a 0.1 second delay
		while(ReadTimer0() < 1)
		{
			// Could do stuff while waiting for timer
		}
		
		WriteTimer0(0x0000);
		PORTB = 0x02;
		// Let's say I want a 0.2 second delay
		while(ReadTimer0() < 1);
		
		WriteTimer0(0x0000);
		PORTB = 0x04;
		// Let's say I want a 1 second delay
		while(ReadTimer0() < 1);
		
		WriteTimer0(0x0000);
		PORTB = 0x08;
		// Let's say I want a 20 second delay
		while(ReadTimer0() < 1);
		WriteTimer0(0x0000);
		while(ReadTimer0() < 1);
    }
}