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📄 12864_lcd.c

📁 基于AVR单片机的LCD液晶驱动工程源代码文件
💻 C
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#include "iom8535v.h"
#include "macros.h"
#include "RT12864_LCD.h"
#include "declare.h"

/**********************************************************
RT12864M LCD DISPLAY
建立时间:2005年2月1号
修改日期:2005年2月1号

**********************************************************/
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
  {
   
    LCD_EN_PORT |= LCD_EN;    //EN=1
    delay_nus(1);
    LCD_EN_PORT &= ~LCD_EN;   //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();
     if (command == 0)
      {
	  LCD_EN_PORT &= ~LCD_EN; //EN=0
	  LCD_RS_PORT |= LCD_RS;  //RS=1       
   	  LCD_RW_PORT &= ~LCD_RW;      //RW=0
	  LCD_DATA_PORT = data_temp;   //send 8bit 
	  LCD_en_write();
      }
    else 
      {
	  LCD_EN_PORT &= ~LCD_EN;  //EN=0
	  LCD_RS_PORT &= ~LCD_RS; //RS=0
	  LCD_RW_PORT &= ~LCD_RW; //RW=0        
	  LCD_DATA_PORT = command_temp;//send command
	  LCD_en_write();
      }
	  LCD_RW_PORT |= LCD_RW;
      LCD_RS_PORT ^= LCD_RS;    
  }

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);
	  }
  }
  

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