lcd1602.c文件

ID:184807 · 发表于 2017-7-31 22:20

#include <reg51.h>
#include <intrins.h>
#define INT8U  unsigned char
#define INT16U unsigned int
sbit RS = P1^0;       //寄存器选择线
sbit RW = P1^1;       //读/写控制线
sbit EN = P2^5;       //使能控制
//-----------------------------------------------------------------
// 延时
//-----------------------------------------------------------------
void delay_ms(INT16U ms)
{
INT8U i; while(ms--) for(i = 0; i < 120; i++);
}

//-----------------------------------------------------------------
// 忙等待
//-----------------------------------------------------------------
void Busy_Wait()
{
INT8U LCD_Status;                      //液晶状态字节变量
do
{
      P0 = 0xFF;
      EN = 0;RS = 0;RW = 1;
      EN = 1;LCD_Status = P0;
      EN = 0;

} while (LCD_Status & 0x80);          //液晶忙继续循环
}

//-----------------------------------------------------------------
// 写LCD命令
//-----------------------------------------------------------------
void Write_LCD_Command(INT8U cmd)
{
Busy_Wait();
EN = 0;RS = 0;RW = 0;
P0 = cmd;
EN = 1;_nop_();EN = 0;

}

//-----------------------------------------------------------------
// 发送数据
//-----------------------------------------------------------------
void Write_LCD_Data(INT8U dat)
{
Busy_Wait();
EN = 0;RS = 1;RW = 0;
P0 = dat;
EN = 1;_nop_();EN = 0;
}

//-----------------------------------------------------------------
// LCD初始化
//-----------------------------------------------------------------
void Initialize_LCD()
{
Write_LCD_Command(0x38); delay_ms(1); //置功能,8位,双行,5*7
Write_LCD_Command(0x01); delay_ms(1); //清屏
Write_LCD_Command(0x06); delay_ms(1); //字符进入模式:屏幕不动,字符后移
Write_LCD_Command(0x0C); delay_ms(1); //显示开,关光标
}

//-----------------------------------------------------------------
// 在指定位置显示字符串
//-----------------------------------------------------------------
void LCD_ShowString(INT8U r, INT8U c,INT8U *str)
{
INT8U i = 0;
code INT8U DDRAM[] = {0x80,0xC0};       //1602LCD两行的起始DDRAM地址
Write_LCD_Command(DDRAM[r] | c);       //设置显示起始位置

for ( i = 0; str[i] && i < 16 ;i++)       //输出字符串
   Write_LCD_Data(str[i]);

for (; i < 16; i++)                      //不足一行时用空格填充
   Write_LCD_Data(' ');
}

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