lcd1.c

单片机通过DA对信号采样

#include"lcd.h"
//#included"include.h"
//RS  (CS)	O	H: Data    L: Instruction Code
//R/W (SID)	O	H: Read    L: Write


//sbit EN=P2^2;
//extern void disp_graphic(unsigned int ru_kou);void lcd_init();

void delay20us(void)
{
	unchar n;
	for(n=0;n<15;n++);
}

void delay15ms(void)
{
	unint n;
	for(n=0;n<4800;n++);
}

void delay125us(void)
{
	unchar n;
	for(n=0;n<100;n++);
}

//EN下降沿写入数据
void lcd_write_command(unchar c)  //向LCD模块的命令寄存器写一个字节c。
{       
	RS=0;
	RW=0;
	EN=0;
	delay20us();
	EN=1;
	delay20us();
	LCDDATA=c;
	delay20us();
	EN=0;
	delay20us();
} 

void lcd_write_data(unchar ddata) //向LCD模块的字符发生器或显存写一个字节data。      
{      
    RS=1;
	RW=0;  
	EN=0;
	delay20us();
    EN=1;
    delay20us();     
    LCDDATA=ddata;  
    delay20us();
	EN=0; 	
	delay20us();
	RS=0;
}
void lcd_init()              //初始化LCD模块。
{         
	lcd_write_command(0x30); //基本命令集
    delay125us();
	lcd_write_command(0x0c); //整体开显示，游标关闭
	delay125us();
	lcd_write_command(0x01); //清除显示
	delay15ms();
	lcd_write_command(0x06); //游标方向设定
	delay125us();
}   
void lcd_clear()
{
  lcd_write_command(0x01);
  delay125us();
  delay125us();
  delay125us();
}  

void lcd_write_sentence(unchar row,unchar col,unchar *string)
{
  unchar i=0;
  //lcd_clear();
  switch(row)
  {
    case 1:
	 lcd_write_command(0x80+col);
	 delay125us();
	 break;
	case 2:
	 lcd_write_command(0x90+col);
	 delay125us();
	 break;
    case 3:
	 lcd_write_command(0x88+col);
	 delay125us();
	 break;
	case 4:
	 lcd_write_command(0x98+col);
	 delay125us();
	 break;
	 default: 
	 lcd_write_command(0x80);
	 delay125us();
	 break;
   }
  while(string[i])
  { 
    lcd_write_data(string[i]);
    delay125us();
	i++;
  }
}
void lcd_write_passage(unchar *string)
{
  unchar i=0;
  lcd_clear();
  lcd_write_command(0x80);
  while(string[i])
  { 
    switch(i)
   {
    case 16:
    lcd_write_command(0x90);
    break;
    case 32:
    lcd_write_command(0x88);
    break;
    case 48:
    lcd_write_command(0x98);
    break;
    //default:
    //break;
    }
    lcd_write_data(string[i]);
    delay125us();
	i++;
  }
}