lcd.txt

AVR基础试验程序

 #include <iom16v.h>
#include <macros.h>
//定义MCU与LCD的接口
#define LCD_EN_PORT    PORTA
#define LCD_RW_PORT    PORTA
#define LCD_RS_PORT    PORTA
#define LCD_DATA_PORT  PORTA
#define LCD_DATA_DDR   DDRA
#define LCD_DATA_PIN   PINA

#define LCD_EN         (1<<PA0)   //portc5         out
#define LCD_RW        (1<<PA1)    //portd3         out/in
#define LCD_RS         (1<<PA2)  //portc4         out
#define LCD_DATA        ((1<<PA4)|(1<<PA5)|(1<<PA6)|(1<<PA7))   //portd4/5/6/7   out
uchar code  cdis0[ ] = {"  Freq:    .    "} ;
uchar code  cdis1[ ] = {"  Speed:    .   "} ;
unsigned char i;
/*--------------------------------------------------------------------------------------------------
Public function prototypes
--------------------------------------------------------------------------------------------------*/
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);

/*-----------------------------------------------------------------------
延时函数
系统时钟：8M
-----------------------------------------------------------------------*/
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();
  }
  
void delay_1ms(void)                 //1ms延时函数
  {
   unsigned int i;
   for (i=0;i<1140;i++);
  }
  
void delay_nms(unsigned int n)       //N ms延时函数
  {
   unsigned int i=0;
   for (i=0;i<n;i++)
   delay_1ms();
  }

/**********************************************************
光标命令
LCD_write_char(0x0e,0);    //光标开
LCD_write_char(0x0d,0);    //光标所在字符闪烁  
LCD_write_char(0x0c,0);    //光标关  
**********************************************************/
/**********************************************************
TC1602B LCD DISPLAY
建立时间：2003年11月9号
修改日期：2003年11月14号
LCD_write函数功能：当command＝0时，向LCD写入数据，否则向LCD写
                   入命令
LCD第一行显示寄存器地址：0X80-0X8F
LCD第二行显示寄存器地址：0XC0-0XCF
**********************************************************/
void LCD_init(void)
  {
    delay_nms(15);
    LCD_write_char(0x28,0);      //4bit test
    LCD_write_char(0x0c,0);      //显示开
    LCD_write_char(0x01,0);      //显示清屏
    LCD_write_char(0x06,0);      //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
  {
    LCD_EN_PORT |= LCD_EN;
    delay_nus(1);
    LCD_EN_PORT &= ~LCD_EN;
  }

 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_RW_PORT |= LCD_RW;                 //RW=1
   
    LCD_RS_PORT &= ~LCD_RS;                //RS=0
   
    LCD_EN_PORT |= LCD_EN;                 //EN=1
   
    while (!( LCD_DATA_PIN&0x80 ) == 0);   //RW=1,读PD7，为0表示空闲；
   
    LCD_EN_PORT &= ~LCD_EN;                //EN=0
   
    LCD_DATA_DDR |= 0xf0;                 //设置为输出porta4/5/6/7
  }
  
/*-----------------------------------------------------------------------
LCD_write_char    : 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，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          ：2003-11-19 
最后修改日期      ：2004-8-19 		
-----------------------------------------------------------------------*/
void LCD_write_char(unsigned command,unsigned data)
  {
    unsigned command_temp,data_temp;        
   
    command_temp = command;
    data_temp = data;
   
    LCD_wait_Ready();
   
    LCD_RW_PORT &= ~LCD_RW;                 //RW=0
   
    if (command == 0)
      {
   	 LCD_RS_PORT |= LCD_RS;             //RS=1 
   	 LCD_DATA_PORT &= 0X0F;
	 LCD_DATA_PORT |= data_temp&0xf0;   //send high 4bit
      }
    else 
      {
	 LCD_RS_PORT &= ~LCD_RS;            //RS=0
	 LCD_DATA_PORT &= 0X0F;
         LCD_DATA_PORT |= command_temp&0xf0;//send high 4bit
      }
    LCD_en_write();
   
    command_temp=command_temp << 4;         //send low 4bit
    data_temp=data_temp       << 4;
   
    LCD_DATA_PORT &= 0X0F;
    if (command==0)
      LCD_DATA_PORT |= data_temp&0xf0;
    else
      LCD_DATA_PORT |= command_temp&0xf0;
    LCD_en_write();
   
    LCD_RW_PORT |= LCD_RW;
  
    LCD_RS_PORT ^= LCD_RS;    
  }



/*-----------------------------------------------------------------------
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          ：2004-8-19 
最后修改日期      ：2004-8-19 		
-----------------------------------------------------------------------*/
void LCD_set_xy( unsigned char x, unsigned char y )
  {
    unsigned char address;
    if (y == 0) address = 0x80 + x;
    else 
       address = 0xc0 + x;
    LCD_write_char( address, 0 );
  }
/*-----------------------------------------------------------------------
LCD_write_string  : 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          ：2004-8-19 
最后修改日期      ：2004-8-19 		
-----------------------------------------------------------------------*/
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 ++;
      }
  }   
void main(void)
  {
     //OSCCAL=0XA5;
     
     DDRA|=LCD_DATA|LCD_RW;
     DDRA|=LCD_RS|LCD_EN;     
     LCD_init();     
     while(1)
       {  LCD_write_char(0x01,0);      //显示清屏
         LCD_write_string(3,0,"Welcome");
         LCD_write_string(1,1,"www.527dz.com!");
         delay_nms(2000);
        LCD_write_char(0x01,0);      //显示清屏
         LCD_write_string(0,0,"Tel:[phone]");
        LCD_write_string(0,1,"[e-mail]");
        delay_nms(2000);
		// for(i=0;i++;i<4)
		 //LCD_write_string(11,0,"b[i]");
		 //delay_nms(2000);
		 
       }
  }