#ifndef __KEY_C
#define __KEY_C

#include "key.h"




unsigned char testkey( void ) {
	unsigned int  val;
//	unsigned char lval;

	ADMUX  = KEYADCCHANNEL;  //channel 0 PORTA0
	ADCSRA = 199;//adps0,1,2 = 1 = prescaler = 128
	             //with 14,7456Mhz we have 115,24Khz
	             //normal single shoot,ADEN,ADSC ON

	while( ! ( ADCSRA & 16 ) ){;}

//	lval = ADCL;
//	val  = ADCH;
//	val  = val << 8;
//	val  = val & 0xff00;
//	val  = val | lval;


	val = ADCW;
	
	if( val < 950 ){

		if( val > 850 ){
			return( KEY_7 );
		}

		if( val > 750 ){
			return( KEY_6 );
		}

		if( val > 650 ){
			return( KEY_5 );
		}

		if( val > 500 ){
			return( KEY_4 );
		}

		if( val > 350 ){
			return( KEY_3 );
		}

		if( val > 150 ){
			return( KEY_2 );
		}

		if( val > 50 ){
			return( KEY_1 );
		}

		return( KEY_0 );
	}

	return(NOKEY);

}









/*
 reads keyinput.
 if a key is pressed, tests ist for
 three times, with a difference of
 10 ms between every test.
 If same key pressed after this
 tests, function waits till key
 is released, then it returns the key.
 Otherwise 0 is returned.
*/
unsigned char readkey( void ) {
	unsigned char val;
	
	val = testkey();
	
	if( val == NOKEY ){
		return( NOKEY );
	}

	Delay1ms(10);
	
	if( (testkey()) != val ){
		return( NOKEY );
	}
	
	Delay1ms(10);
	
	if( (testkey()) != val ){
		return( NOKEY );
	}

	while(testkey() == val){;}
	
	return(val);	
}




#endif