#include
#include //头文件
***it RS = P2^4; //定义端口,便于进行操作和改动
***it RW = P2^5;
***it 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
#define DataPort P0 //液晶口
#define KeyPort P1 //键盘口
unsigned char code hhj_code[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};//转换成液晶显示的字符
/*------------------------------------------------
uS延时函数,含有输入参数 unsigned char t,无返回值
unsigned char 是定义无符号字符变量,其值的范围是
0~255 这里使用晶振12M,精确延时请使用汇编,大致延时
长度如下 T=tx2+5 uS
------------------------------------------------*/
void DelayUs2x(unsigned char t)
{
while(--t);
}
/*------------------------------------------------
mS延时函数,含有输入参数 unsigned char t,无返回值
unsigned char 是定义无符号字符变量,其值的范围是
0~255 这里使用晶振12M,精确延时请使用汇编
------------------------------------------------*/
void DelayMs(unsigned char t)
{
while(t--)
{
//大致延时1mS
DelayUs2x(245);
DelayUs2x(245);
}
}
/*------------------------------------------------
判忙函数
------------------------------------------------*/
bit LCD_Check_Busy(void)
{
DataPort= 0xFF;
RS_CLR;
RW_SET;
EN_CLR;
_nop_();
EN_SET;
return (bit)(DataPort & 0x80);
}
/*------------------------------------------------
写入命令函数
------------------------------------------------*/
void LCD_Write_Com(unsigned char com)
{
while(LCD_Check_Busy()); //忙则等待
DelayMs(5);
RS_CLR;
RW_CLR;
EN_SET;
DataPort= com;
_nop_();
EN_CLR;
}
/*------------------------------------------------
写入数据函数
------------------------------------------------*/
void LCD_Write_Data(unsigned char Data)
{
while(LCD_Check_Busy()); //忙则等待
DelayMs(5);
RS_SET;
RW_CLR;
EN_SET;
DataPort= Data;
_nop_();
EN_CLR;
}
/*------------------------------------------------
清屏函数
------------------------------------------------*/
void LCD_Clear(void)
{
LCD_Write_Com(0x01);
DelayMs(5);
}
/*------------------------------------------------
写入字符串函数
------------------------------------------------*/
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 ++;
}
}
/*------------------------------------------------
写入字符函数
------------------------------------------------*/
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);
}
/*------------------------------------------------
初始化函数
------------------------------------------------*/
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*/
}
/*------------------------------------------------
按键扫描函数,返回扫描键值
------------------------------------------------*/
unsigned char KeyScan(void) //键盘扫描函数,使用行列反转扫描法
{
unsigned char cord_h,cord_l;//行列值中间变量
KeyPort=0x0f; //行线输出全为0
cord_h=KeyPort&0x0f; //读入列线值
if(cord_h!=0x0f) //先检测有无按键按下
{
DelayMs(10); //去抖
if((KeyPort&0x0f)!=0x0f)
{
cord_h=KeyPort&0x0f; //读入列线值
KeyPort=cord_h|0xf0; //输出当前列线值
cord_l=KeyPort&0xf0; //读入行线值
while((KeyPort&0xf0)!=0xf0);//等待松开并输出
return(cord_h+cord_l);//键盘最后组合码值
}
}return(0xff); //返回该值
}
/*------------------------------------------------
按键值处理函数,返回扫键值
------------------------------------------------*/
unsigned char KeyPro(void)
{
switch(KeyScan())
{
case 0x7e:return 0;break;//0 按下相应的键显示相对应的码值
case 0x7d:return 1;break;//1
case 0x7b:return 2;break;//2
case 0x77:return 3;break;//3
case 0xbe:return 4;break;//4
case 0xbd:return 5;break;//5
case 0xbb:return 6;break;//6
case 0xb7:return 7;break;//7
case 0xde:return 8;break;//8
case 0xdd:return 9;break;//9
case 0xdb:return 10;break;//a
case 0xd7:return 11;break;//b
case 0xee:return 12;break;//c
case 0xed:return 13;break;//d
case 0xeb:return 14;break;//e
case 0xe7:return 15;break;//f
default:return 0xff;break;
}
}
/*------------------------------------------------
主函数
------------------------------------------------*/
void main(void)
{
unsigned char i,j,num;
LCD_Init();
LCD_Write_Com(0x0F);//光标开,光标闪烁开
LCD_Write_String(0,0,"Press the key !");
while (1)
{
num=KeyPro();
if(num!=0xff)
{
if((i==0)&&(j==0))//回到第一个字符时清屏
LCD_Clear();//清屏
LCD_Write_Char(0+i,0+j,hhj_code[num]);//依次显示输入字符
i++;
if(i==16)//如果第一行显示满,转到第二行
{
i=0;j++;
if(j==2)//如果2行都显示满,清屏后重新从第一行显示
{
j=0;
}
}
}
}
}
求各个语句的解释
跪求
|