// -*- tab-width: 4 -*-
// LED Blinker for HOODMICRO
//
// Copyright (c) 2005, K9spud LLC.
// http://www.k9spud.com/hoodmicro/
// 
// Compile from command line: 
// picl -12F629 -Zg blink.c
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#include <stdio.h>
#include <pic.h>

// Configuration word set to:
//  - internal oscillator (INTIO)
//  - watch dog timer disabled (WDTDIS)
//  - power up timer enabled (PWRTEN)
// See PIC12F6X.H in the HI-TECH PICC include folder for all options.
__CONFIG(INTIO & WDTDIS & PWRTEN);

#define bitset(var, bit) ((var) |= 1 << (bit))
#define bitclr(var, bit) ((var) &= ~(1 << (bit)))

#define LED_PIN 4

void main(void)
{
	unsigned int i;
  
	INTCON = 0; // disable interrupts
	TRISIO = ~(1 << LED_PIN); // configure all pins as inputs, except the LED_PIN
	OSCCAL = _READ_OSCCAL_DATA(); // restore oscillator calibration

	for(;;)
	{
		bitset(GPIO, LED_PIN); // turn the LED on
		for(i = 0; i < 10000; ++i)
		{
			// do nothing, busy wait loop
		}
		
		bitclr(GPIO, LED_PIN); // turn the LED off
		for(i = 0; i < 10000; ++i)
		{
			// do nothing, busy wait loop
		}
	}
}