/* (C) 2005 by Richard West (rw88@cornell.edu)
 * Published: 25 Feb 2005
 * Published under GNU General Public License - http://www.linux.org/info/gnu.html
 *
 * Keypad test program
 *
 * Hardware setup notes:
 *		Keypad connected to PortA.0-7
 *		LCD connected to PortC.0-7
 */

// Mega32 compiler directive
#include <Mega32.h>

// LCD compiler directives
#asm(".equ __lcd_port=0x15")
#include <lcd.h>

// keypad compiler direcive
//#define KEYPAD_TELPAD // using a telephone style keypad
#define KEYPAD_HEXPAD // using a hexadecimal style keypad
//#define KEYPAD_KEYBOARD // using a telephone style keypad as a keyboard
#define KEYPAD_USEPORTA // wish to connect keypad to PortA
#define KEYPAD_USEDISPLAY // wish to use and LCD for display
#include "keypad.h"

// runtime global variables
unsigned char count;
unsigned char keypad_time;

// function prototype
void init(void);

// timer0 overflow interrupt service routine
interrupt [TIM0_OVF] void tim0_ovf_isr(void)
{
	// decrement and check count
	if(!(--count))
	{
		// increment time and reset count
		count = 62 + (++keypad_time%2);
	}
}

void main(void)
{
	// map keypad buttons
	#ifdef KEYPAD_TELPAD
	keypad_define_terminator('#');
	keypad_map_keysymbol('*','.');
	#endif
	#ifdef KEYPAD_HEXPAD
	keypad_define_terminator('E');
	keypad_map_keysymbol('F','.');
	#endif

	lcd_init(16); // initialize LCD
	init(); // initialize MCU

	// quick welcome message
	lcd_clear();
	lcd_gotoxy(0,1);
	lcd_putsf("<string>#");

	#ifdef KEYPAD_USEDISPLAY
	// setup keypad display options
	keypad_set_display(KEYPAD_ECHODISPLAY);
	keypad_gotoxy(0,0);
	#endif

	// release the keypad
	keypad_release();

	while(1)
	{
		// check keypad_time
		if (keypad_time >= 30)
		{
			// reset keypad_time
			keypad_time = 0x00;

			// get keystring
			keypad_get_string();
		}

		if (keystring_ready)
		{
			// display keystring on LCD
			lcd_clear();
			lcd_gotoxy(0,1);
			lcd_puts(keystring);

			// reset the keypad
			#ifdef KEYPAD_USEDISPLAY
			keypad_gotoxy(0,0);
			#endif
			keypad_release();
		}
	}
}

void init(void)
{
	// initialize ports
	DDRA = 0x00; // set portA as input

	// setup timer0
	// 16 MHz system clock
	// prescaler = 1 -> 16 MHz timer
	TIMSK = 0x01; // enable the timer0 overflow interrupt
	TCCR0 = 0x01; // set timer0 to system clock

	// enable interrupts
	#asm("sei")
}