print.c

C51打印的一个小程序。用KEIL C进行编写。

#define uchar unsigned char
#define uint unsigned int
#include <reg52.h>
#include <stdio.h>
#include <absacc.h>
#include <math.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#define PIN  XBYTE[0x8000]
#define POUT XBYTE[0x9000]
sbit PRINTSTB =P1^6;
sbit DOG=P1^7;
bdata char pinvalue;
sbit PRINTBUSY=pinvalue^7;
sbit PRINTSEL =pinvalue^6;
sbit PRINTERR =pinvalue^5;
sbit PRINTACK =pinvalue^4;

void PrintString(uchar *String1,uchar *String2);
void initprint(void);
void print(uchar a);

void initprint(void)  //打印机初始化子程序 
{
    pinvalue=PIN;
    if((PRINTSEL==1)&&(PRINTERR==1))
    {
        print(0x1b);  print(0x40);  print(0x1b);  print(0x38);  print(0x4);
    }
}
void print(uchar a)  //打印字符a
{
    pinvalue=PIN;
    if((PRINTSEL==0)||(PRINTERR==0)) return;
    for(;;) {
        DOG=~DOG;
        pinvalue=PIN;
        if(PRINTBUSY==0) break;
    }
    DOG=~DOG;
    POUT=a;
    PRINTSTB=1;    PRINTSTB=1;    PRINTSTB=1;    PRINTSTB=1;
    PRINTSTB=0;    PRINTSTB=0;    PRINTSTB=0;    PRINTSTB=0;
    PRINTSTB=1;
}
void PrintString(uchar *String) //打印字符串后回车
{
   uchar CH;
   for (;;) {
      DOG=~DOG;
      CH=*String;
      if (CH==0) { print(0x0d); break; }
      print(CH);
      String++;
   }
   initprint();
}