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/***************************************************************************** name: ls description: 基于51单片机，滚动显示，lcd1602显示，第一行静止不动显 示“Welcome！”， 第二行滚动显示“Tall trees catch much wind!” 但是有个问题，当第二行的数组大于30的时候，会出现lcd第一行 被影响的现象。 *****************************************************************************/
#include
#include
#define dataport P0//定义11个端口
sbit RS = P2^4;
sbit RW = P2^5;
sbit EN = P2^6;
#define RS_clr RS = 0
#define RS_set RS = 1
#define RW_clr RW = 0
#define RW_set RW = 1
#define EN_clr EN = 0
#define EN_set EN = 1
void delayus2x(unsigned char t);
void delayms(unsigned char t);
void lcd_clear(void); //清屏函数
//bit lcd_check_busy();//检测lcd是否忙
void lcd_write_com(unsigned char com);//写命令
void lcd_write_data(unsigned char Data);//写数据
void lcd_write_char(unsigned char x,unsigned char y,unsigned char Data);//显示字符
void lcd_write_string(unsigned char x,unsigned char y,unsigned char *s);//显示字符串
void lcd_init(void);
unsigned char p[] = " Tall trees catch much wind!";
void main()
{
unsigned char i=0,j=0,n=0;
lcd_init();
lcd_write_string(4,0,"Welcome!");
while(1)
{
lcd_write_com(0x80+0x40);
for(j=n;j=40-15)
{
n=0;
delayms(500);
delayms(500);
}
delayms(500);
}
}
void lcd_init(void)
{
lcd_write_com(0x38); /*显示模式设置*/
delayms(5);
lcd_write_com(0x38);
delayms(5);
lcd_write_com(0x38);
delayms(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*/
delayms(5);
lcd_write_com(0x0C); /*显示开及光标设置*/
}
/*
fun 显示char
param x （0-f），y （0-1）显示位置 Data显示内容
retval None
*/
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);
}
void lcd_write_string(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 ++;
}
}
void lcd_clear(void)
{
lcd_write_com(0x01);
delayms(5);
}
void lcd_write_com(unsigned char com)
{
//while(lcd_check_busy( ) ) ;//忙则等待
delayms(5); //5ms够系统变成idle
RS_clr;
RW_clr;
EN_set;
dataport = com;
_nop_();
EN_clr;
}
void lcd_write_data(unsigned char Data)
{
delayms(5); //5ms够系统变成idle
RS_set;
RW_clr;
EN_set;
dataport = Data;
_nop_();
EN_clr;
}
/*bit lcd_check_busy()//检测lcd是否忙
{
dataport = 0xff;
RS_clr;
RW_set;
EN_clr;
_nop_();
EN_set;
return (bit)(dataport & 0x80);
}*/
void delayus2x(unsigned char t)
{
while(--t);
}
void delayms(unsigned char t)
{
while(t--)
{
delayus2x(245);
delayus2x(245);
}
}
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