單片機(jī)C語言實(shí)例-140-外部頻率測試

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單片機(jī)C語言實(shí)例-140-外部頻率測試

內(nèi)容：
  引腳定義如下：1-VSS 2-VDD 3-V0 4-RS 5-R/W 6-E 7-14 DB0-DB7 15-BLA 16-BLK
------------------------------------------------*/
#include "1602.h"
#include "delay.h"

#define CHECK_BUSY

sbit RS = P2^4;   //定義端口
sbit RW = P2^5;
sbit EN = P2^6;

#define RS_CLR RS=0
#define RS_SET RS=1

#define RW_CLR RW=0
#define RW_SET RW=1

#define EN_CLR EN=0
#define EN_SET EN=1

#define DataPort P0

/*------------------------------------------------
              判忙函數(shù)
------------------------------------------------*/
bit LCD_Check_Busy(void)
{
#ifdef CHECK_BUSY
DataPort= 0xFF;
RS_CLR;
RW_SET;
EN_CLR;
_nop_();
EN_SET;
return (bit)(DataPort & 0x80);
#else
return 0;
#endif
}
/*------------------------------------------------
              寫入命令函數(shù)
------------------------------------------------*/
void LCD_Write_Com(unsigned char com)
{  
while(LCD_Check_Busy()); //忙則等待
RS_CLR;
RW_CLR;
EN_SET;
DataPort= com;
_nop_();
EN_CLR;
}
/*------------------------------------------------
              寫入數(shù)據(jù)函數(shù)
------------------------------------------------*/
void LCD_Write_Data(unsigned char Data)
{
while(LCD_Check_Busy()); //忙則等待
RS_SET;
RW_CLR;
EN_SET;
DataPort= Data;
_nop_();
EN_CLR;
}

/*------------------------------------------------
                清屏函數(shù)
------------------------------------------------*/
void LCD_Clear(void)
{
LCD_Write_Com(0x01);
DelayMs(5);
}
/*------------------------------------------------
              寫入字符串函數(shù)
------------------------------------------------*/
void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)
{     

while (*s)
        {     
LCD_Write_Char(x,y,*s);     
s ++;  x++;   
        }
}
/*------------------------------------------------
              寫入字符函數(shù)
------------------------------------------------*/
void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data)
{     
if (y == 0)
        {     
        LCD_Write_Com(0x80 + x);     
        }   
else
        {     
        LCD_Write_Com(0xC0 + x);     
        }        
LCD_Write_Data( Data);  
}
/*------------------------------------------------
              初始化函數(shù)
------------------------------------------------*/
void LCD_Init(void)
{
   LCD_Write_Com(0x38);    /*顯示模式設(shè)置*/
   DelayMs(5);
   LCD_Write_Com(0x38);
   DelayMs(5);
   LCD_Write_Com(0x38);
   DelayMs(5);
   LCD_Write_Com(0x38);  
   LCD_Write_Com(0x08);    /*顯示關(guān)閉*/
   LCD_Write_Com(0x01);    /*顯示清屏*/
   LCD_Write_Com(0x06);    /*顯示光標(biāo)移動(dòng)設(shè)置*/
   DelayMs(5);
   LCD_Write_Com(0x0C);    /*顯示開及光標(biāo)設(shè)置*/
   }

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