pp40.c

51单片机开发与应用技术详解(珍藏版)PPT及源码

#include<reg52.h>						//头文件

sbit STROBE=P1^7;						//STROBE引脚
sbit BUSY=P3^6;						//BUSY引脚
sbit ACK=P3^7;						//ACK引脚

unsigned char code Message[]= 			//一行消息
    {0x48,0x65,0x6c,0x6c,0x6f,0x20,0x77,0x6f,0x6c,0x6d,0x21}; 

void PP40Char(unsigned char ch) 			//PP40打印单个字符
{
   P1=ch;                   			//字符输出到DATA
   STROBE=0;             				//STROBE低电平
   STROBE=1;                   		//STROBE上升沿
   while(BUSY);             				//查询等待PP40打印结束
}

void PP40Line(void) 					//PP40打印一行
{ 
  unsigned char i;
   for (i=0;i<=10;i++) 					//循环打印输出一行信息
{ 
       P1=Message[i];					//字符输出到DATA
       STROBE=0;						//STROBE低电平
       STROBE=1;						//STROBE高电平
       while(BUSY);					//查询等待PP40打印结束
   }
}

void main(void) 
{
   int i;
   for(i=0;i<10;i++)
   {
	PP40Char(0x2A);					//打印输出"*"
}
   PP40Char(0x0D);         				//换行
   PP40Line();             				//打印输出一行消息"Hello world!"
   PP40Char(0x0D);         				//换行
   PP40Char(0x57);   					//打印输出字符"W"
   PP40Char(0x45);   					//打印输出字符"E"
   PP40Char(0x4C);   					//打印输出字符"L"
   PP40Char(0x43);   					//打印输出字符"C"
   PP40Char(0x4F);   					//打印输出字符"O"
   PP40Char(0x4D);   					//打印输出字符"M"
   PP40Char(0x45);   					//打印输出字符"E"
   PP40Char(0x0D);         				//换行
   while(1)							//空循环
   {
   }
}