main.c

基于凌阳单片机下的12864液晶显示程序

//main.c
#include"spce061a.h"
char *str1,*str2,*str3,*str4,*str5;
void LCD_init         (void);
void LCD_en_write     (void);
void LCD_write_char   (unsigned command,unsigned data);
void LCD_wait_Ready   (void);
void LCD_set_xy       (unsigned char x, unsigned char y);
void LCD_write_string (unsigned char X,unsigned char Y,unsigned char *s);
void delay_nus        (unsigned int n);
void delay_nms        (unsigned int n);


void delay_1us(void)                 //1us延时函数
  {
   asm("nop");
  }

void delay_nus(unsigned int n)       //N us延时函数
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   {delay_1us();
   *P_Watchdog_Clear=0x0001;}
  }
  
void delay_1ms(void)                 //1ms延时函数
  {
   unsigned int i;
   for (i=0;i<1140;i++)
   {
   	*P_Watchdog_Clear=0x0001;
   }
  }
  
void delay_nms(unsigned int n)       //N ms延时函数
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1ms();
  }


void LCD_init(void)
  {
    delay_nms(1);
    LCD_write_char(0x01,0);      //显示清屏
    LCD_write_char(0x0C,0);      //显示开
   LCD_write_char(0x80,0);      //显示光标移动设置
  }

void LCD_en_write(void)        //EN端产生一个高电平脉冲，写LCD
  {
   
    *P_IOB_Data |= 0X0004;    //EN=1
    delay_nus(1);
    *P_IOB_Data &= ~0X0004;   //EN=0
  }

/*-----------------------------------------------------------------------
LCD_write_char    : 中英文字符串显示函数
LCD_write函数功能：当command＝0时，向LCD写入数据，否则向LCD写
                   入命令
输入参数：*s      ：中英文字符串指针；
          X、Y    : 显示字符串的位置，X:0-15，Y:0-1
                    LCD第一行显示寄存器地址：0X80-0X87
					LCD第二行显示寄存器地址：0X90-0X9F
					LCD第三行显示寄存器地址：0X88-0X8F
                    LCD第四行显示寄存器地址：0X98-0X9F
-----------------------------------------------------------------------*/
void LCD_write_char(unsigned command,unsigned  data)
  {
   unsigned  command_temp;
	unsigned  data_temp;        
    command_temp = command;
    data_temp = data;
    //LCD_wait_Ready();
    	delay_nms(10);
     if (command == 0)
      {
	  *P_IOB_Data &= ~0x0004; //EN=0
	  *P_IOB_Data |= 0x0001;  //RS=1       
   	  *P_IOB_Data &= ~0x0002;      //RW=0
	  *P_IOA_Data=data_temp;   //send 8bit 
	  LCD_en_write();
      }
    else 
      {
	  *P_IOB_Data &= ~0x0004;  //EN=0
	  *P_IOB_Data &= ~0x0001; //RS=0
	  *P_IOB_Data &= ~0x0002; //RW=0        
	  *P_IOA_Data=command_temp;//send command
	  LCD_en_write();
      }
	  *P_IOB_Data |= 0x0002;
      *P_IOB_Data ^= 0x0001;    
  }

/*void LCD_wait_Ready(void)                  //等待LCD空闲
  {
    LCD_DATA_DDR &= ~0x80;                 //PD7 I/O口方向设置为输入
    LCD_RS_PORT &= ~LCD_RS;                //RS=0
   delay_1us(1);
  	LCD_RW_PORT |= LCD_RW;                 //RW=1
    LCD_EN_PORT |= LCD_EN;                 //EN=1
    while (!( LCD_DATA_PIN&0x80 ) == 0);	 
    LCD_EN_PORT &= ~LCD_EN;                //EN=0
    LCD_DATA_DDR |= 0xFF;
  }*/

/*-----------------------------------------------------------------------
LCD_set_xy        : 设置LCD显示的起始位置

输入参数：x、y    : 显示字符串的位置，X:0-15，Y:0-1
                    LCD第一行显示寄存器地址：0X80-0X8F
                    LCD第一行显示寄存器地址：0XC0-0XCF

编写日期          ：2005
最后修改日期      ：2005	
-----------------------------------------------------------------------*/
void LCD_set_xy( unsigned char x, unsigned char y )
  {
    unsigned char address;
	switch(y){
	case 0: 
	   address = 0x80 + x;
	    break; 
    case 1: 
	    address = 0x90 + x;
		break; 
	case 2: 
	address = 0x88 + x;
	break; 
    case 3: 
	address = 0x98 + x;
	break; 
	default:address = 0x80 + x;}
    LCD_write_char( address, 0 );
	
  }
/*-----------------------------------------------------------------------
LCD_write_string  : 中英文字符串显示函数

输入参数：*s      ：英文字符串指针；
          X、Y    : 显示字符串的位置 

编写日期          ：2005
最后修改日期      ：2005	
-----------------------------------------------------------------------*/
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
  {
  LCD_set_xy( X, Y );
    
    while (*s) 
      {
        LCD_write_char( 0, *s );
	    s ++;
		delay_nms(1);
	  }
  }
  

void main(void)
  {*P_IOA_Dir=0xFFFF;							//初始化IOA,IOA0~7下拉输入
	*P_IOA_Attrib=0xFFFF;
	*P_IOA_Data=0x0000;
	
	*P_IOB_Dir=0xffff;							//初始化IOB,IOB8~11同向输出
	*P_IOB_Attrib=0xffff;
	*P_IOB_Data=0x0000;
 
  str1="河北科技大学";
  
  str2="环境科学工程学院";
  str3="我爱中华";
  str4="张强";
  str5="燃烧爆炸学";
   
   
  // LCD_EN_PORT &= ~LCD_EN;
   delay_nms(10);
     LCD_init();
	  while(1){
	LCD_write_char( 0x01, 0 );   //清屏
	//delay_nms(100);
	//LCD_write_string(1,0,str1);
	//delay_nms(400);
//	LCD_write_char( 0x01, 0 );   //清屏
	LCD_write_string(1,0,str5);
	LCD_write_string(0,1,str2);
	LCD_write_string(2,2,str3);
	LCD_write_string(3,3,str4);
	delay_nms(400);
	}	
}