LCD12864显示实验

/*
实验十六：
 LCD12864液晶屏显示实验。
 1、LCD12864显示实验。显示AVR开发网及网址信息。
 2、内部1 M晶振，程序采用单任务方式，软件延时。
 3、进行此实验请插上JP1、JP2的所有8个短路块，PC6、PC7短路块。
 4、RW1用于调节显示屏的对比度。
 AVR  mega16学习板

  www.iccavr.com
 16:22 2007-4-25
*/
此主题相关图片如下：lcd12864接口图.jpg

#include 
#include "font.h"
#include "lcd12864.h"
void main(void) {
 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;
 disp_init();
 disp_clear(0, 128, 0);
 disp_clear(0, 128, 2);
 disp_clear(0, 128, 4);
 disp_clear(0, 128, 6);

  
 disp_char_str(28, 2, "AVR");
 disp_word(52, 2, CBFAA);
 disp_word(68, 2, CB7A2);
 disp_word(84, 2, CCDF8);
 disp_char_str(8, 5, "www.iccavr.com");
 while (1);
}

/*
 LCD12864液晶屏驱动模块
 1、可直接嵌入到项目中使用
 2、晶振频率：1M
 3、如晶振提高低层驱动延时要作相应修改
 AVR_AFA
 www.iccavr.com
*/
#include <iom16v.h>
#include "font.h"
#define RS_CLR PORTD &= ~(1 << PD3)/*命令或数据选择*/
#define RS_SET PORTD |= (1 << PD3)/*RS = 1命令，RS = 0数据*/
#define RW_CLR PORTD &= ~(1 << PD4)/*读取或写入选择*/
#define RW_SET PORTD |= (1 << PD4)/*RW = 1读，RW = 0写*/
#define EN_CLR PORTD &= ~(1 << PD6)/*读写使能信号*/
#define EN_SET PORTD |= (1 << PD6)/*下降沿有效*/
#define RST_CLR PORTD &= ~(1 << PD7)/*芯片复位脚*/
#define RST_SET PORTD |= (1 << PD7)/*高电平复位*/
#define CSA_CLR PORTC &= ~(1 << PC6)/*左半屏片选*/
#define CSA_SET PORTC |= (1 << PC6)/*高电平选中*/
#define CSB_CLR PORTC &= ~(1 << PC7)/*右半屏片选*/
#define CSB_SET PORTC |= (1 << PC7)/*高电平选中*/
/*延时函数*/
void delay_us(unsigned int n) {
 if (n == 0) {
  return ;
  }
 while (--n);
}
/*延时函数*/
void delay_ms(unsigned char i) {
 unsigned char a, b;
 for (a = 1; a < i; a++) {
  for (b = 1; b; b++) {
   ;
   }
  }
}
/*显示屏命令写入函数前半屏*/
void LCD0_write_com(unsigned char com) {
 
 RS_CLR;
 RW_CLR;
 CSA_SET;
 CSB_CLR;
 EN_SET;
 PORTB = com;
 delay_us(1);
 EN_CLR;
}
/*显示屏命令写入函数后半屏*/
void LCD1_write_com(unsigned char com) {
 
 RS_CLR;
 RW_CLR;
 CSA_CLR;
 CSB_SET;
 EN_SET;
 PORTB = com;
 delay_us(1);
 EN_CLR;
}
/*显示屏命令写入函数*/
void LCD0_write_data(unsigned char data) {
 RS_SET;
 RW_CLR;
 CSA_SET;
 CSB_CLR;
 EN_SET;
 PORTB = data;
 delay_us(1);
 EN_CLR;
}
/*显示屏命令写入函数*/
void LCD1_write_data(unsigned char data) {
 RS_SET;
 RW_CLR;
 CSA_CLR;
 CSB_SET;
 EN_SET;
 PORTB = data;
 delay_us(1);
 EN_CLR;
}
/*显示屏清空显示*/
void disp_clear(unsigned char x0, unsigned char x1, unsigned char y) {
 unsigned char x;
 
 /*清除高位*/ 
 x = x0;
 if (x < 63) {   /*地址在左半屏范围内*/
  LCD0_write_com(y | 0xB8);
  LCD0_write_com(x | 0x40);
  }
 while (x < x1) {
  LCD0_write_data(0x00);
  x ++;
  if (x > 63) {  /*判断地址是否越界*/
   break;
   }
  }
 if (x < x1) {   /*地址进入左半屏范围*/
  LCD1_write_com(y | 0xB8);
  LCD1_write_com(x | 0x40);
  }
 while (x < x1) {
  LCD1_write_data(0x00);
  x ++;
  }
 /*清除低位*/
 x = x0;
 if (x < 63) {   /*地址在左半屏范围内*/
  LCD0_write_com((y+1) | 0xB8);
  LCD0_write_com(x | 0x40);
  }
 while (x < x1) {
  LCD0_write_data(0x00);
  x ++;
  if (x > 63) {  /*判断地址是否越界*/
   break;
   }
  }
 if (x < x1) {   /*地址进入左半屏范围*/
  LCD1_write_com((y+1) | 0xB8);
  LCD1_write_com(x | 0x40);
  }
 while (x < x1) {
  LCD1_write_data(0x00);
  x ++;
  }
}
/*在指定位置显示一个ASCII 字符*/
void disp_char(unsigned char x, unsigned char y, unsigned char ascii) {
 unsigned char i = 0x00;
 const unsigned char *q; /*取字库指针*/
 
 ascii -= 0x20;
 q = &ENGLISH_FONT[ascii * 16];/*定位指针地址*/
 /*显示高8位*/ 
 i = 0x00;
 if (x < 64) {   /*地址在左半屏范围内*/
  LCD0_write_com(y | 0xB8);
  LCD0_write_com(x | 0x40);
  while (i < 8) {
   LCD0_write_data(*q);
   q ++;
   x ++;
   i ++;
   if (x > 63) { /*判断地址是否越界*/
    break;
    }
   }
  }
 if (i < 8) {   /*地址进入左半屏范围*/
  LCD1_write_com(y | 0xB8);
  LCD1_write_com(x | 0x40);
  while (i < 8) {
   LCD1_write_data(*q);
   q ++;
   x ++;
   i ++;
   }
  }
 /*显示低8位*/
 i = 0x00;
 x -= 8;
 if (x < 64) {   /*地址在左半屏范围内*/
  LCD0_write_com((y+1) | 0xB8);
  LCD0_write_com(x | 0x40);
  while (i < 8) {
   LCD0_write_data(*q);
   q ++;
   x ++;
   i ++;
   if (x > 63) { /*判断地址是否越界*/
    break;
    }
   }
  }
 if (i < 8) {   /*地址进入左半屏范围*/
  LCD1_write_com((y+1) | 0xB8);
  LCD1_write_com(x | 0x40);
  while (i < 8) {
   LCD1_write_data(*q);
   q ++;
   x ++;
   i ++;
   }
  }
 CSA_CLR;
 CSB_CLR;
}
/*在指定位置显示一个汉字*/
void disp_word(unsigned char x, unsigned char y, unsigned char word) {
 unsigned char i = 0x00;
 const unsigned char *q; /*取字库指针*/
 
 q = &CHINESE_FONT[word * 32];/*定位指针地址*/
 /*显示高16位*/ 
 i = 0x00;
 if (x < 64) {   /*地址在左半屏范围内*/
  LCD0_write_com(y | 0xB8);
  LCD0_write_com(x | 0x40);
  while (i < 16) {
   LCD0_write_data(*q);
   q ++;
   x ++;
   i ++;
   if (x > 63) { /*判断地址是否越界*/
    break;
    }
   }
  }
 if (i < 16) {   /*地址进入左半屏范围*/
  LCD1_write_com(y | 0xB8);
  LCD1_write_com(x | 0x40);
  while (i < 16) {
   LCD1_write_data(*q);
   q ++;
   x ++;
   i ++;
   }
  }
 /*显示低16位*/
 i = 0x00;
 x -= 16;
 if (x < 64) {   /*地址在左半屏范围内*/
  LCD0_write_com((y+1) | 0xB8);
  LCD0_write_com(x | 0x40);
  while (i < 16) {
   LCD0_write_data(*q);
   q ++;
   x ++;
   i ++;
   if (x > 63) {  /*判断地址是否越界*/
    break;
    }
   }
  }
 if (i < 16) {   /*地址进入左半屏范围*/
  LCD1_write_com((y+1) | 0xB8);
  LCD1_write_com(x | 0x40);
  while (i < 16) {
   LCD1_write_data(*q);
   q ++;
   x ++;
   i ++;
   }
  }
 CSA_CLR;
 CSB_CLR;
}
/*显示一串字符*/
void disp_char_str(unsigned char x, unsigned char y, unsigned char *str) {
 while (*str != 0) {
  disp_char(x, y, *str);
  x += 8;
  str ++;
  }
}
/*显示屏初始化函数*/
void disp_init(void) {
 
 DDRB = 0xFF;  /*I/O口方向设置*/
 DDRC |= (1 << PC6) | (1 << PC7);
 DDRD |= (1 << PD3) | (1 << PD4) | (1 << PD6) | (1 << PD7);
 RST_CLR;
 delay_ms(10);
 RST_SET;
 LCD0_write_com(0xC0); /*显示起行设置*/
 LCD1_write_com(0xC0);
 
 LCD0_write_com(0x3F); /*开显示设置*/
 LCD1_write_com(0x3F);
}