HD44780读写C51程序

＃include <reg51.h>＃include <intrins.h>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<w) {}}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(' ');