單片機源程序如下:
- #include"lcd.h"
- void Read_Busy() //忙檢測函數，判斷bit7是0，允許執行；1禁止
- {
- unsigned char sta; //
- LCD1602_DB = 0xff;
- LCD1602_RS = 0;
- LCD1602_RW = 1;
- do
- {
- LCD1602_EN = 1;
- sta = LCD1602_DB;
- LCD1602_EN = 0; //使能，用完就拉低，釋放總線
- }while(sta & 0x80);
- }
- void Lcd1602_Write_Cmd(unsigned char cmd) //寫命令
- {
- Read_Busy();
- LCD1602_RS = 0;
- LCD1602_RW = 0;
- LCD1602_DB = cmd;
- LCD1602_EN = 1;
- LCD1602_EN = 0;
- }
- void Lcd1602_Write_Data(unsigned char dat) //寫數據
- {
- Read_Busy();
- LCD1602_RS = 1;
- LCD1602_RW = 0;
- LCD1602_DB = dat;
- LCD1602_EN = 1;
- LCD1602_EN = 0;
- }
- void LcdSetCursor(unsigned char x,unsigned char y) //坐標顯示
- {
- unsigned char addr;
- if(y == 0)
- addr = 0x00 + x;
- else
- addr = 0x40 + x;
-
- Lcd1602_Write_Cmd(addr|0x80);
- }
- //按指定位置顯示一個字符
- void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
- {
- Y &= 0x1;
- X &= 0xF; //限制X不能大于15，Y不能大于1
- if (Y) X |= 0x40; //當要顯示第二行時地址碼+0x40;
- X |= 0x80; //算出指令碼
- Lcd1602_Write_Cmd(X); //發命令字
- Lcd1602_Write_Data(DData); //發數據
- }
- void LcdShowStr(unsigned char x,unsigned char y,unsigned char *str) //顯示字符串
- {
- LcdSetCursor(x,y); //當前字符的坐標
- while(*str != '\0')
- {
- Lcd1602_Write_Data(*str++);
- }
- }
- void InitLcd1602() //1602初始化
- {
- Lcd1602_Write_Cmd(0x38); //打開，5*8,8位數據
- Lcd1602_Write_Cmd(0x0c);
- Lcd1602_Write_Cmd(0x06);
- Lcd1602_Write_Cmd(0x01); //清屏
- }
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