LCD顯示字符串

ID:215568 · 發(fā)表于 2017-6-28 18:04

#include "reg51.h"
#include"absacc.h"
typedef unsigned char BYTE;
typedef unsigned int  WORD;

#define  wr_com  XBYTE[0xC000]
#define  wr_data  XBYTE[0xC100]
#define  rd_com  XBYTE[0xC200]
#define  rd_data  XBYTE[0xC300]

void lcd_init(void);                                  // lcd???
void write_cmd(BYTE cmd);
void write_data(BYTE dat) ;                   // ???
void set_display_place(BYTE line,column);
void write_string_lcd(BYTE line,column,unsigned char *string);
void Delay(WORD n)
{    WORD x;
   while(n--)
{    x=500; while(x--);  }
}
void write_cmd(BYTE cmd)
   {    BYTE dl;
   do {
   dl=rd_com; }
   while((dl&0x80)!=0); //??
   wr_com= cmd;
   Delay(1); }

   void write_data(BYTE dat)
{  BYTE dl;
   do { dl=rd_com; }
   while((dl&0x80)!=0); //??
   wr_data= dat;
Delay(1); }

void write_string(BYTE *s)
{    while(*s != '\0')          //'\0'????????
{       write_data(*s);
s++;    } }

void set_display_place(BYTE line,column) {
BYTE address;
if(line == 1)    {
address = 0x80 + column;
   }
else if(line == 2)
{       address = 0xc0 + column;    }
write_cmd(address);       }

void write_string_lcd(BYTE line,column,unsigned char *string) {
set_display_place(line,column);
write_string(string);
Delay(1); }
void lcd_init(void)    {
write_cmd(0x38);//
write_cmd(0x38);//
write_cmd(0x06);//
write_cmd(0x0c);//
write_cmd(0x01);//
}
void main() {
   lcd_init();
while(1)
{
write_string_lcd(1,1," 0123456789 ");
write_string_lcd(2,1," ABCDEDGHIJ ");    } }

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