超聲波流量計的主程序研究與設計  十五

 

//4.lcd顯示子程序                                                              

//  檢查LCD忙狀態

//  lcd_busy為1時，忙，等待。Lcd_busy為0時,閑，可寫指令與數據                                                                                                                   

//-----------------------------------------------------------------

bit lcd_busy()

 {                         

    bit result;

    LCD_RS = 0;

    LCD_RW = 1;

    LCD_EN = 1;

    delayNOP();

    result = (bit)(P0&0x80);

    LCD_EN = 0;

    return(result);

 }

 

//-----------------------------------------------------------------                                                               

//  寫指令數據到LCD

//  RS=L，RW=L，E=高脈沖，D0-D7=指令碼。                                                                                                                  

//-----------------------------------------------------------------

void lcd_wcmd(uchar cmd)

{                         

   while(lcd_busy());//首先判斷lcd是否處于忙的狀態

    LCD_RS = 0;//通過RS.RW.EN的設置，進入寫指令狀態

    LCD_RW = 0;

    LCD_EN = 0;

    _nop_();//空操作，延時作用

    _nop_();

    P0 = cmd;//從P0口度讀入指令

    delayNOP();

    LCD_EN = 1;//使能發送

    delayNOP();//等待發送完畢

    LCD_EN = 0;  //發送完畢后關關閉

}

 

//-----------------------------------------------------------------                                                              

//  寫顯示數據到LCD 

//  RS=H，RW=L，E=高脈沖，D0-D7=數據。                                                                                                                   

//-----------------------------------------------------------------

void lcd_wdat(uchar dat)

{                         

   while(lcd_busy());//lcd_busy（）=1,則處于忙狀態，就等待

    LCD_RS = 1;//設置RS.RW.EN，進入寫數據狀態

    LCD_RW = 0;

    LCD_EN = 0;

    P0 = dat;//從P0口讀入數據

    delayNOP();

    LCD_EN = 1;//將數據存儲到LCD的ROM中

    delayNOP();

    LCD_EN = 0;

}

 

//-----------------------------------------------------------------                                                               

//  LCD初始化設定                                                                                                                      

//-----------------------------------------------------------------

void lcd_init()

{

 

    LCD_PSB = 1;         //并口方式

   

    lcd_wcmd(0x34);      //擴充指令操作

    delay(5);

    lcd_wcmd(0x30);      //基本指令操作

    delay(5);

    lcd_wcmd(0x0C);      //顯示開，關光標

    delay(5);

    lcd_wcmd(0x01);      //清除LCD的顯示內容

    delay(5);

}

超聲波流量計