HD44780读写C51程序

下面我给大家介绍一个HD44780读写单片机c51程序

＃include
＃include

sbit GND_LCD=P1^7;
sbit rs=P1^0;
sbit rw=P1^1;
sbit e=P1^2;

unsigned char busy(void);
void ctrl(unsigned char);
void wd_h(unsigned char);
void wd_l(unsigned char);
unsigned char rd(void);
void write(unsigned char);
void init(void);
void NOP(void);

void disp(unsigned char);

unsigned int time;

void int_t0 (void) interrupt 1 {
TL0=TL0+30;TH0=0xfb;
time++;
}

void wait(unsigned int w){
time=0;
while (time}

void init(void) {
unsigned char i;
P1=0;
for (i=0;i<2;i++) {
wd_l(0x30);
wait(5);
}
wd_h(0x20);
ctrl(0x28);
ctrl(0x8);
ctrl(3);
ctrl(6);
disp(0);
ctrl(1);
ctrl(8);
ctrl(0xe);
ctrl(0x80);
}

unsigned char busy(void){
P1=0;
return(rd());
}

unsigned char rd(void) {
unsigned char dat0,dat1;
rw=1;
rs=0;
P1=P1|0x78;
e=1;
dat0=P1;
e=0;
e=1;
dat1=P1;
P1=0;
return(((dat0<<1)&0xf0) | ((dat1>>3)&0xf) );
}

void ctrl(unsigned char dat){
while (busy()>0x7f) {};
rw=rs=0;
wd_h(dat);
wd_l(dat);
}
void wd_h(unsigned char dat){
e=1;
P1=P1|((dat&0xf0)>>1);
e=0;
P1=P1&0x87;
}
void wd_l(unsigned char dat){
e=1;
P1=P1|((dat&0xf)<<3);
e=0;
P1=0;
}
void write(unsigned char dat) {
while (busy()>0x7f) {};
rw=0;
rs=1;
wd_h(dat);
wd_l(dat);
}

//===============HD44780读写程序====================================
void disp(unsigned char i) {
unsigned char j;
ctrl(1);
ctrl(0x80);
for (j=0;j<6;j++) write(d[i][j]);
write(' ');