lcd1602a.c

c8051f新华龙单片机开发运用程序

//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include <c8051f310.h>                 // SFR declarations
#include <INTRINS.H>
#include <stdio.h>
//-----------------------------------------------------------------------------
// Global CONSTANTS
//-----------------------------------------------------------------------------
#define  uchar unsigned char
#define  uint  unsigned int

#define SYSCLK    24500000            // SYSCLK frequency in Hz

//----------------------------------------------------------------------------
void Write_COM(uchar ins);
void Write_CHAR(uchar d);
void YJ_Init(void);
void writelcd(uchar disdata);
void SPI0_Init (void);

unsigned char xdata discode;           //开关显示、光标、闪烁的命令字暂存单元
unsigned long x;
unsigned char  virt_port;

sbit   LCDCS  = P3^3; 
                  
//-----------------------------------------------------------------------------
//SPI_INIT
//-----------------------------------------------------------------------------
void SPI0_Init (void)
{
   SPI0CFG = 0x70;                     // data sampled on 1st SCK rising edge
                                       // 8-bit data words

   SPI0CN = 0x09;                      // Master mode; SPI enabled; flags
                                       // cleared
   SPI0CKR = 0x03;//SYSCLK/2/3000000-1;// SPI clock <= 8MHz (limited by 
                                       // EEPROM spec.)
}
//-----------------------------------------------------------------------------
//write com
//-----------------------------------------------------------------------------
void Write_COM(uchar ins)
     {
      uchar xdata i,t;
	  uint xdata j;
	 
	  for(j=0;j<500;j++);	            	//用延时代替查询
	  virt_port|=ins&0xf0;
	  writelcd(virt_port);
      //LCDE=1;
	  virt_port|=0x08;
	  writelcd(virt_port);
      for(i=3;i>0;i--);
      //LCDE=0;
	  virt_port&=~0x08;
	  writelcd(virt_port);

      virt_port&=0x07;
	  writelcd(virt_port);
      t=ins<<4;             
      virt_port|=t&0xf0;           
	  writelcd(virt_port);
      //LCDE=1;
	  virt_port|=0x08;
	  writelcd(virt_port);
      for(i=3;i>0;i--);
      //LCDE=0;
	  virt_port&=~0x08;
	  writelcd(virt_port);
      virt_port=0;
	  writelcd(virt_port);
     }
//----------------------------------------------------------------------------------
//write data
//----------------------------------------------------------------------------------
void Write_CHAR(uchar d)
    {
      uchar xdata i,t;
	  uint xdata j;
	 
      for(j=0;j<500;j++);		//用延时代替查询
	  virt_port|=0x02;
	  writelcd(virt_port);
      virt_port|=d&0xf0;
	  writelcd(virt_port);
      virt_port|=0x08;//E=1
	  writelcd(virt_port);
      for(i=3;i>0;i--);
      virt_port&=0xf7; //E=0
	  writelcd(virt_port);
      virt_port&=0x07;				
	  writelcd(virt_port);
	       
      t=d&0x0f;
      virt_port|=t<<4;
	  writelcd(virt_port);

	  virt_port|=0x08; //E=1
	  writelcd(virt_port);
      for(i=3;i>0;i--); 
      virt_port&=0xf7; //E=0
	  writelcd(virt_port);
      virt_port=0;
	  writelcd(virt_port);
    }
//------------------------------------------------------------------------------------------
//------------------------------------------------------------------------------------------
void YJ_Init(void)
     {
      uint xdata i;


      virt_port=0;
	  writelcd(virt_port);
      virt_port|=0x08;       	//E=1，第一步
	  writelcd(virt_port);
      virt_port|=0x30;
	  writelcd(virt_port);
	  for(i=20;i>0;i--); 
      virt_port&=0xf7;    		//E=0
	  writelcd(virt_port);
      virt_port=0;
	  writelcd(virt_port);
      for(i=20000;i>0;i--);
      for(i=20000;i>0;i--);
	  	
      virt_port|=0x08;     	    //E=1，第二步
	  writelcd(virt_port);
      virt_port|=0x30;
	  writelcd(virt_port);
	  for(i=20;i>0;i--); 
      virt_port&=0xf7;    		//E=0
	  writelcd(virt_port);
      virt_port=0;
	  writelcd(virt_port);
      for(i=1000;i>0;i--);

      virt_port|=0x08;     	    //E=1，第三步
	  writelcd(virt_port);
      virt_port|=0x30;
	  writelcd(virt_port);
	  for(i=20;i>0;i--); 
      virt_port&=0xf7;    		//E=0
	  writelcd(virt_port);
      virt_port=0;
	  writelcd(virt_port);
      for(i=1000;i>0;i--);	    //3次延时，重要！
	
	  for(i=8000;i>0;i--);		//用延时代替查询	  

    
      virt_port=0;				//第五步，写入20码，设置为4位总线方式,非常重要！！！！！
	  writelcd(virt_port);
      virt_port|=0x20;			//只写高字节
	  writelcd(virt_port);
      virt_port|=0x08;          //E=1
	  writelcd(virt_port);
	  for(i=20;i>0;i--);
      virt_port&=0xf7;          //E=0
	  writelcd(virt_port);
	  for(i=10;i>0;i--);
      virt_port=0;
	  writelcd(virt_port);

      Write_COM(0x28);		    //第六步。。。。
      for(i=50;i>0;i--);

	  Write_COM(0x01);
      for(i=50;i>0;i--);

      Write_COM(0x0e);
      for(i=50;i>0;i--);     

      Write_COM(0x06);
      for(i=50;i>0;i--);

     }
//-----------------------------------------------------
void writelcd(uchar disdata)     //write 595
	{
	uint xdata i;

	for(i=0;i<3;i++);
	LCDCS=1;
    SPIF = 0;
    for(x=0;x<50;x++);
	SPI0DAT=disdata;

    while (SPIF == 0);	 		// 等待写结束
    for(x=0;x<500;x++);
	LCDCS=0;
    for(x=0;x<500;x++);	
	}
//----------------------------------------------------------
//end of file