lcd1602显示实验[avr论坛].txt

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LCD1602显示实验
      LCD1602显示实验/*实验十五： LCD1602显示实验。 1、LCD1602显示实验。显示欢及网址信息。 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，PC7短路块。 AVR  mega16学习板 www.iccavr.com 2007-04-13*/此主题相关图片如下：lcd接口图.jpg#include <iom16v.h>#include "lcd1602.h"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 = "www.iccavr.com";  LCD_clear();  LCD_write_str(5,0,"Welcome");  delay_ms(250);    while (*p) {   LCD_write_char(i,1,*p);   i ++;   p ++;   delay_ms(250);   }  delay_ms(250);  }}下面是完整的项目文件，已测试通过。

      
      LCD1602驱动/* LCD1602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 程序编写过程中参照了peak的4线显示程序 peak：AVR论坛技术版版主*/#include <iom16v.h>#define RS_CLR PORTD &= ~(1 << PD3)#define RS_SET PORTD |= (1 << PD3)#define RW_CLR PORTD &= ~(1 << PD4)#define RW_SET PORTD |= (1 << PD4)#define EN_CLR PORTD &= ~(1 << PD6)#define EN_SET PORTD |= (1 << PD6)/*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*/void LCD_write_com(unsigned char com) {  RS_CLR; RW_CLR; EN_SET; PORTB = com; delay_us(5); EN_CLR;}/*显示屏命令写入函数*/void LCD_write_data(unsigned char data) { RS_SET; RW_CLR; EN_SET; PORTB = data; delay_us(5); EN_CLR;}/*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*/}