AVR單片機IIC實驗

//-------------------1602.h--------------------

//------------1602.h-------------

#define RS1 PORTB_Bit0=1

#define RS0 PORTB_Bit0=0

#define RW1 PORTB_Bit1=1

#define RW0 PORTB_Bit1=0

#define EN1 PORTB_Bit2=1

#define EN0 PORTB_Bit2=0

#define DATAPORT PORTA

#define busy 0x80

void wait()

{

uchar val;

DATAPORT=0xff;

RS0;

RW1;

__no_operation();

EN1;

__no_operation();

__no_operation();

DDRA=0x00;

val=PINA;

while(val&busy)val=PINA;

EN0;

DDRA=0xff;

}

void writecmd(uchar w)

{

wait();

RS0;

RW0;

__no_operation();

DATAPORT=w;

__no_operation();

EN1;

__no_operation();

__no_operation();

EN0;

}

void writedata(uchar data)

{

wait();

RS1;

RW0;

__no_operation();

DATAPORT=data;

__no_operation();

EN1;

__no_operation();

__no_operation();

EN0;

}

void delay_nms(uint k)

{

uint i,j;

for(i=0;i

for(j=0;j<1140;j++);

}

void init()

{

delay_nms(15);

writecmd(0x38);

delay_nms(5);

writecmd(0x38);

delay_nms(5);

writecmd(0x38);

writecmd(0x80);

writecmd(0x01);

writecmd(0x06);

writecmd(0x0c);

}

void display(uchar x,uchar y,uchar *p)

{

uchar add=0x80;

y=y&0x01;

x=x&0x0f;

if(y)add=add+0x40;

writecmd(add+x);

while(*p!=