IAR For AVR -- LCD1602

下面是程序，定义在程序里很明显，要注意的是背光是用三极管控制的，但是效果不是很好，反而不如直接接。

源代码包括三个文件：LCD1602.C    ，    main.c    ，delay.h

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LCD1602.C

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#include
#include "delay.h"

/*设置管脚*/
#define RS PORTD_Bit3              
#define RW PORTD_Bit4
#define E PORTD_Bit6

/*LCD1602控制指令*/
#define LCD_Set        0x38   // 显示初始化，16*2显示，5*7点阵，8位数据接口 ;
#define LCD_Clear      0x01   // 清屏LCD ;
#define LCD_Display1   0x0f   // 显示功能设置:开显示，显示光标，光标闪烁 ;
#define LCD_Display2   0x0c   // 显示功能设置:开显示，不显示光标，光标不闪烁 ;
#define LCD_Mode       0x06   // 设置光标状态默认0x06,为读一个字符光标加1 ;

#define LCD_FirstLineAddress_Left   0x80          //设置初始化数据指针,指向 左半屏第一行首位 ; 
#define LCD_SecondLineAddress_Left (0x80+0x40)    //设置初始化数据指针,指向 左半屏第二行首位 ;

#define LCD_FirstLineAddress_Right (0x80+0x10)          //设置初始化数据指针,指向 右半屏第一行首位 ; 
#define LCD_SecondLineAddress_Right (0x80+0x40+0x10)     //设置初始化数据指针,指向 右半屏第二行首位 ;

#define LCD_Move_Left   0x18 // 整屏左移
#define LCD_Move_Right 0x1c // 整屏右移

/*端口初始化*/
void Port_Init()
{
DDRD_Bit3 = 1;   //控制端 RS 定义为输出
DDRD_Bit4 = 1;   //控制端 RW 定义为输出
DDRD_Bit6 = 1;   //控制端 E 定义为输出

DDRB = 0xFF;     //数据端定义为输出

DDRC_Bit7 = 1;   //背光控制端
PORTC_Bit7 =0;   //由三级管控制，低电平导通； 始终打开背光
}

/*液晶1602 写控制指令函数*/
void Write_Command(unsigned char Command)
{
RS = 0 ;                       // 进行指令的操作
RW = 0 ;                       // 进行写操作
PORTB = Command ;              // 赋值指令
E = 1 ;                        // 使能端拉高
delay_ms(5);                   // 等待指令写完
E = 0 ;                        // 使能端拉低
}

/*液晶1602 写数据函数*/
void Write_Data(unsigned char Data)
{
RS = 1 ;                       // 进行数据的操作
RW = 0 ;                       // 进行写操作
PORTB = Data ;                 // 赋值数据
E = 1 ;                        // 使能端拉高
delay_ms(5);                   // 等待数据写完
E = 0 ;                        // 使能端拉低
}

/*液晶1602 使用初始化*/
void LCD1602_Init()
{
E = 0;
Write_Command(LCD_Set);
Write_Command(LCD_Clear);
Write_Command(LCD_Display2);
Write_Command(LCD_Mode);
}

/*液晶1602 清屏*/
void LCD1602_Clear(void)
{
Write_Command(LCD_Clear);
}

/*液晶1602 左半屏显示*/
void LCD1602_Left_Display(unsigned char *table1 , unsigned char *table2)
{
unsigned char i;

Write_Command(LCD_FirstLineAddress_Left);delay_ms(1);    //第一行显示16个字符
for(i=0;i<16;i++)
{
Write_Data(table1[i]);
delay_ms(50); 
}

Write_Command(LCD_SecondLineAddress_Left);delay_ms(1);    //第二行显示16个字符
for(i=0;i<16;i++)
{
Write_Data(table2[i]);
delay_ms(1);
}
}

/*液晶1602 右半屏显示*/
void LCD1602_Right_Display(unsigned char *table1 , unsigned char *table2)
{
unsigned char i;

Write_Command(LCD_FirstLineAddress_Right);   //第一行显示16个字符delay_ms(1); 
for(i=0;i<16;i++)
{
Write_Data(table1[i]);
delay_ms(50); 
}

Write_Command(LCD_SecondLineAddress_Right);   //第二行显示16个字符delay_ms(1); 
for(i=0;i<16;i++)
{
Write_Data(table2[i]);
delay_ms(1);
}
}

/*液晶1602 左移*/
void LCD1602_TurnLeft()
{
unsigned char i;                 
for(i=0;i<16;i++)
{
Write_Command(LCD_Move_Left);
delay_ms(100);
}
}

/*液晶1602 右移*/
void LCD1602_TurnRight()
{
unsigned char i;                 
for(i=0;i<16;i++)
{
Write_Command(LCD_Move_Right);
delay_ms(100);
}
}

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main.c

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#include
#include "delay.h"

unsigned char dou1[]=" I LIKE AVR !          ";
unsigned char dou2[]="Douzi&Douer AVR!";

unsigned char dou3[]=" AVR to ARM !       ";
unsigned char dou4[]=" I Will Win !            ";

/*调用函数声明*/
void Port_Init();
void LCD1602_Init();
void LCD1602_Clear(void);
void LCD1602_Left_Display(unsigned char *table1 , unsigned char *table2);
void LCD1602_Right_Display(unsigned char *table1 , unsigned char *table2);
void LCD1602_TurnLeft();
void LCD1602_TurnRight();

/*主函数*/

void main(void)
{
Port_Init();
LCD1602_Init();
while(1)
{
    LCD1602_Left_Display(dou1,dou2);
    LCD1602_Right_Display(dou3,dou4);
    LCD1602_TurnLeft();
    delay_s(2);
    LCD1602_TurnRight();
    delay_s(2);
}
}

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delay.h

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#ifndef __IAR_DELAY_H
#define __IAR_DELAY_H

#include

#define XTAL 7.3728 //可定义为你所用的晶振频率（单位Mhz）

#define delay_us(x) __delay_cycles ( (unsigned long)(x * XTAL) ) 
#define delay_ms(x) __delay_cycles ( (unsigned long)(x * XTAL*1000) )
#define delay_s(x) __delay_cycles ( (unsigned long)(x * XTAL*1000000) )

#endif