矩阵键盘-AVR程序代码

#include

#include

#asm

.equ__lcd_port=0x18;PORTB

#endasm

#include

#defineucharunsignedchar

#defineuintunsignedint

ucharge=0,shi=0;

ucharkey_value=0;

voidlay_ms(uintms)

{

uintx,y;

for(x=0;x

{

for(y=0;y<1141;y++);

}

}

ucharkeyscan()

{

uchari,j,temp,Buffer[4]={0xef,0xdf,0xbf,0x7f};//1110110110110111

for(j=0;j<4;j++)

{

PORTA=Buffer[j];

lay_ms(2);

temp=0x01;

for(i=0;i<4;i++)

{

if(!(PINA&temp))

{

return((i+j*4)+1);

}

temp=temp<<1;

}

}

}

voiddisplay(ucharm)

{

if(m)

{

lcd_clear();

lay_ms(15);

lcd_putsf("thekeynumber:");

ge=(m-56)+48;

shi=((m-56)/10)+48;

lcd_gotoxy(6,1);

lcd_putchar(shi);

lcd_putchar(ge);

lay_ms(100);

m=0;

}

}

voidkey_16()

{

if((PINC&0X0F)!=0X0F)

{

lay_ms(20);

if((PINA&0X0F)!=0X0F)

{

key_value=keyscan();

//key_value=55;

while((PINA&0X0F)!=0X0F);

lay_ms(5);

while((PINA&0X0F)!=0X0F);

}

}

}

voidmain(void)

{

PORTA=0x0F;

DDRA=0xF0;

PORTB=0x00;

DDRB=0x00;

PORTC=0x00;

DDRC=0x00;

PORTD=0x00;

DDRD=0x00;

TCCR0=0x00;

TCNT0=0x00;

OCR0=0x00;

TCCR1A=0x00;

TCCR1B=0x00;

TCNT1H=0x00;

TCNT1L=0x00;

ICR1H=0x00;

ICR1L=0x00;

OCR1AH=0x00;

OCR1AL=0x00;

OCR1BH=0x00;

OCR1BL=0x00;

ASSR=0x00;

TCCR2=0x00;

TCNT2=0x00;

OCR2=0x00;

MCUCR=0x00;

MCUCSR=0x00;

//Timer(s)/Counter(s)Interrupt(s)initialization

TIMSK=0x00;

ACSR=0x80;

SFIOR=0x00;

//LCDmoduleinitialization

lcd_init(16);

lcd_clear();

lcd_putsf("thekeynumber:");

while(1)

{

key_16();

printf("%dn",key_value-48);

display(key_value);

PORTA=0X0f;

};

}