lcd1602.txt

lcd 1602使用程序 调试过 可放心使用

#include <iom16v.h>
#include <macros.h>

#define RS_0    PORTD &= ~(1 << PD3)
#define RS_1    PORTD |= (1 << PD3)

#define RW_0    PORTD &= ~(1 << PD4)
#define RW_1    PORTD |= (1 << PD4)

#define EN_0    PORTD &= ~(1 << PD6)
#define EN_1    PORTD |= (1 << PD6)

//微秒级延时程序晶振8MHZ
void delay_us(int time)
{    
    do
        {
            time--;
        }    
        while (time>1);
}
      
//毫秒级延时程序晶振8MHZ 
void delay_ms(unsigned int time)
{
    while(time!=0)
        {        
            delay_us(1000);
            time--;
        }
}

/*显示屏命令写入函数*/
void LCD_write_com(unsigned char com) 
  {
    
    RS_0;
    RW_0;
    PORTB = com;
    EN_1;
    delay_us(20);
    EN_0;
  }

/*显示屏命令写入函数*/
void LCD_write_data(unsigned char data) {

    RS_1;
    RW_0;
    PORTB = data;
    EN_1;
    delay_us(200);
    EN_0;
}

/*显示屏清空显示*/
void LCD_clear(void) {

    LCD_write_com(0x01);
    delay_ms(5);
}

/*显示屏字符串写入函数*/
void LCD_write_str(unsigned char x,unsigned char y,unsigned char *s) 
      
      {
    
    if (y == 0) {
        LCD_write_com(0x80 + x);
        }
    else {
        LCD_write_com(0xC0 + x);
        }
    
    while (*s)
      {
        LCD_write_data( *s);
        s ++;
        }
}

/*显示屏单字符写入函数*/
void LCD_write_char(unsigned char x,unsigned char y,unsigned char data) 
      {
    
        if (y == 0)
          {
          LCD_write_com(0x80 + x);
          }
        else 
          {
          LCD_write_com(0xC0 + x);
          }
    
    LCD_write_data( data);  
      }

/*显示屏初始化函数*/
void LCD_init(void) {
    
    DDRB = 0xFF;                        /*I/O口方向设置*/
    DDRD |= (1 << PD3) | (1 << PD4) | (1 << PD6);
    LCD_write_com(0x38);                /*显示模式设置*/
    delay_ms(5);
    LCD_write_com(0x38);
    delay_ms(5);
    LCD_write_com(0x38);
    delay_ms(5);
    LCD_write_com(0x38);
    
    LCD_write_com(0x08);                /*显示关闭*/
    LCD_write_com(0x01);                /*显示清屏*/
    LCD_write_com(0x06);                /*显示光标移动设置*/
    delay_ms(5);
    LCD_write_com(0x0C);                /*显示开及光标设置*/
}



void main(void) {

    unsigned char i;
    unsigned char *p;

    PORTA = 0xFF;                /*打开上拉*/
    DDRA = 0x00;                /*方向输入*/
    PORTB = 0xFF;                /*电平设置*/
    DDRB = 0xFF;                /*方向输出*/
    PORTC = 0x7F;
    DDRC = 0x80;
    PORTD = 0xFF;
    DDRD = 0x00;

    delay_ms(100);
    LCD_init();

    while (1) 
        {
        i = 1;
        p = "yixiangongren";
        //LCD_clear();
        LCD_write_str(1,0,"www.eehome.cn");
        delay_ms(50);
        
        while (*p) 
          {
            LCD_write_char(i,1,*p);
            i ++;
            p ++;
            //delay_ms(50);
            }
        delay_ms(500);
        }
}