lcd.txt

AVR基础试验程序

#include <iom16v.h> 
#include <macros.h> 
#define uchar unsigned char
#define uint unsigned int
#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<<PA2)   //portc5         out
#define LCD_RW        (1<<PA1)    //portd3         out/in
#define LCD_RS         (1<<PA0)  //portc4         out
#define LCD_DATA        ((1<<PA4)|(1<<PA5)|(1<<PA6)|(1<<PA7))   //portd4/5/6/7   out
//char dis_buff[6]; // 显示缓冲区，存放要显示的8个字符的段码值
//char time_1ms_ok,display_ok=0;
//unsigned  int freq_time,time0_old,time0_new,r;
//unsigned long int freq,s;
///////////////////////////////////////////

void DelayMs(uint i )           //Ms级延时，参数i为延时时间
{uint j;
 for(;i!=0;i--)
  {for(j=1142;j!=0;j--) {;}}     //原来8000，改为1142//
}
/////////////////////////////////////////////////
void delay_1us()
  {
   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();
  }
////////////////////////////////////////


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	 
  }
////////////////////////////////////
void LCD_write_char(unsigned char command,unsigned char data)
  {    unsigned char 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;    
	  delay_nus(1);
  }
/////////////////////////////////////////////////////
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 );
  }
//////////////////////////////////////
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);
		//delay_nus(70);
	s ++;
     }
}
/////////////////////////////////
void LCD_write_string1(unsigned char X,unsigned char Y,unsigned char dat)
  {
     LCD_set_xy( X, Y );       
       LCD_write_char( 0, dat);
	   }	
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
  }