#include <reg51.h>
#include <intrins.h>
#define INT8U unsigned char
#define INT16U unsigned int
sbit RS = P1^0; //寄存器選擇線
sbit RW = P1^1; //讀/寫控制線
sbit EN = P2^5; //使能控制
//-----------------------------------------------------------------
// 延時
//-----------------------------------------------------------------
void delay_ms(INT16U ms)
{
INT8U i; while(ms--) for(i = 0; i < 120; i++);
}
//-----------------------------------------------------------------
// 忙等待
//-----------------------------------------------------------------
void Busy_Wait()
{
INT8U LCD_Status; //液晶狀態字節變量
do
{
P0 = 0xFF;
EN = 0;RS = 0;RW = 1;
EN = 1;LCD_Status = P0;
EN = 0;
} while (LCD_Status & 0x80); //液晶忙繼續循環
}
//-----------------------------------------------------------------
// 寫LCD命令
//-----------------------------------------------------------------
void Write_LCD_Command(INT8U cmd)
{
Busy_Wait();
EN = 0;RS = 0;RW = 0;
P0 = cmd;
EN = 1;_nop_();EN = 0;
}
//-----------------------------------------------------------------
// 發送數據
//-----------------------------------------------------------------
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,雙行,5*7
Write_LCD_Command(0x01); delay_ms(1); //清屏
Write_LCD_Command(0x06); delay_ms(1); //字符進入模式:屏幕不動,字符后移
Write_LCD_Command(0x0C); delay_ms(1); //顯示開,關光標
}
//-----------------------------------------------------------------
// 在指定位置顯示字符串
//-----------------------------------------------------------------
void LCD_ShowString(INT8U r, INT8U c,INT8U *str)
{
INT8U i = 0;
code INT8U DDRAM[] = {0x80,0xC0}; //1602LCD兩行的起始DDRAM地址
Write_LCD_Command(DDRAM[r] | c); //設置顯示起始位置
for ( i = 0; str[i] && i < 16 ;i++) //輸出字符串
Write_LCD_Data(str[i]);
for (; i < 16; i++) //不足一行時用空格填充
Write_LCD_Data(' ');
}
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