矩阵键盘-AVR程序代码

ID:51024 · 发表于 2014-7-12 01:57

以前学的AVR写的一些程序，分享一下

#include

#include

#asm

.equ __lcd_port=0x18 ;PORTB

#endasm

#include

#define uchar unsigned char

#define uint unsigned int

uchar ge=0,shi=0;

uchar key_value=0;

void lay_ms(uint ms)

{

uint x,y;

for(x=0;x

{

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

}

}

uchar keyscan()

{

uchar i,j,temp,Buffer[4] = {0xef, 0xdf, 0xbf, 0x7f};//1110 1101 1011 0111

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;

}

}

}

void display(uchar m)

{

if(m)

{

lcd_clear();

lay_ms(15);

lcd_putsf("the key number :");

ge=(m-56)+48;

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

lcd_gotoxy(6,1);

lcd_putchar(shi);

lcd_putchar(ge);

lay_ms(100) ;

m=0;

}

}

void key_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);

}

}

}

void main(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;

// LCD module initialization

lcd_init(16);

lcd_clear();

lcd_putsf("the key number :");

while (1)

   {

   key_16();

   printf("%d\n",key_value-48);

   display(key_value);

   PORTA=0X0f;

   };

}

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