/*
 * HtM_Sensors.c
 *
 * Created: 11/21/2017 9:11:11
 * Author : Casey Evans
 */ 

/* Original template from the Tinysaur project */
/* Adapted basic functional code from Neil's code */

#include <avr/io.h>
#include <util/delay.h>

// ====================================
//                ATtiny
//                 44A
//              +--------+
//            --+Vcc  GND+---------
//  LED - PB0 --+        +-- PA0
//  LED - PB1 --+        +-- PA1
//  LED - PB3 --+        +-- PA2
//  LED - PB2 --+        +-- PA3
//  LED - PA7 --+        +-- PA4
//  LED - PA6 --+        +-- PA5
//              +--------+
// ====================================

// Define the I/O port to be used for the sensors.
// The sensors each use one or two ports and I will define them accordingly.
// That way they will line up properly on the headers.

#define LED_PORT PA7
#define BUTTON_PORT PB2
#define BUTTON_IN (1 << PB2)

int main(void) {
	
	// Set port as output
	// The DDRA/B is the data direction register
	// The code below
	//  - shifts the "1" on left to the desired position
	//  - does bitwise "OR" with the value in the port register.
	DDRA |= (1 << LED_PORT);
	// Sets port as input
	DDRB &= ~(1 << BUTTON_PORT);
	// Engages pull-up resistor
	PORTB |= (1 << BUTTON_PORT);
	
	while (1) {
		
		// wait for button down
		//
		while (0 != (PINB & BUTTON_IN))
		;
		PORTA |= (1 << LED_PORT);
		//
		// wait for button up
		//
		while (0 == (PINB & BUTTON_IN))
		;
		PORTA &= ~(1 << LED_PORT);

	}
	return (0);
}