/*
*	PIC16F819-I/P
*	PWM lightting
*/

#include <htc.h>
#include "picw.h"

__CONFIG (INTCLK & WDTEN & PWRTEN & MCLREN & LVPDIS &
		UNPROTECT & DEBUGDIS & BORDIS & CCPRB3 );

// internal CLK setting
void clk_sel(BBYTE csel){	//IRCF=110 4MHz
	csel &= 0x7;
	OSCCON |= (csel<<4);
	IOFS = 0;
	while(IOFS==0) continue;
}

//io format
void ioini(void){
	INTCON = 0x0;
	TRISA = 0b00110000;
	TRISB = 0b00000000;
	PORTA = 0xE;
	PORTB = 0b11100000;
	ADCON1 = 0x6;
}

//timer2 format
void tim2ini(void){	//prescale=1MHz 1:1
	TMR2IE = 0;
	T2CON = 0x0;
}

//CCP module format
void ccpini(BBYTE ccp1set,BBYTE result){	//result = PWM resultion
	result &= 0x3;
	CCP1CON |= (result<<4);
	CCP1CON |= 0xF;
	CCPR1L = ccp1set;
	TMR2 = 0x0;
	PR2 = 0xFF;
	TMR2ON = 1;
}

void main(void){
	static bit dutyset;
	volatile BWORD cnt = 0;
	clk_sel(0b110);
	ioini();
	tim2ini();
	ccpini(0x00,0b00);
	while(true){
		if(CCPR1L==PR2)
			dutyset = false;
		else if(CCPR1L==0x0)
			dutyset = true;
		else ;

		if(cnt==0x60){
			if(dutyset)
				CCPR1L++;
			else
				CCPR1L--;
			cnt = 0;
		}
		else
			cnt++;

		RB7 = RB3;
	}
}