//[LCD.c]液晶顯示----------------------------------------------------------*
//本文件包含:                                                              *
//    (1)LCDInit:液晶顯示初始化                                            *
//    (2)LCDShow:在HD44780顯示屏上顯示數(shù)據(jù)                                 *
//    (3)LCD_Command:執(zhí)行給定的cmd命令                                     *
//硬件連接:                                                                *
//    (1)LCD的DB0-7與MCU的B口的PTB0-7連接                                  *
//    (2)LCD的RS,R/W,E與MCU的PTM2,PTM3,PTM6連接                            *
//-------------------------------------------------------------------------*

//頭文件
#include "LCD.h"    //液晶顯示頭文件

//LCDInit:初始化LCD函數(shù)----------------------------------------------------*
//功  能:初始化Lcd(HD44780),設置顯示方式,清屏,AC自動+1                     *
//參  數(shù):無                                                                *
//返  回:無                                                                *
//內(nèi)部調(diào)用函數(shù):LCD_Command                                                 *
//-------------------------------------------------------------------------*
void LCDInit(void)
{
    INT16U i;
    //定義數(shù)據(jù)口(PTB0-7)為輸出
    LCDData_D = 0xFF;          //數(shù)據(jù)口為輸出
    //定義控制口(PTC0-2)為輸出
    LCDCtrl_D |= (1<<LCDE);
    LCDCtrl_D |= (1<<LCDRS);
    LCDCtrl_D |= (1<<LCDRW);
    //設置指令
    LCDCtrl &= ~(1<<LCDRS);    //RS、R/W=00,寫指令
    LCDCtrl &= ~(1<<LCDRW);    
    LCD_Command(0x38);
               //||||||||____ 可設任意值(0/1)
               //||||||______ F  = 0,5*7點陣模式
               //|||||_______ N  = 1,2行顯示
               //||||________ DL = 1,8位數(shù)據(jù)總線
               //|||_________ 固定為001
    LCD_Command(0x08);         //關顯示,關光標顯示,不閃爍	
    LCD_Command(0x01);         //清屏
    for (i=0; i<20000; i++);    //延時>1.6ms
    LCD_Command(0X06);
    LCD_Command(0x14);         //光標右移一個字符位,AC自動加1
    LCD_Command(0x0C);         //開顯示,關光標顯示,不閃爍
}

//LCDShow:在HD44780顯示屏上顯示數(shù)據(jù)----------------------------------------*
//功  能:在HD44780顯示屏顯示str所指向的32個數(shù)據(jù)                            *
//參  數(shù):str=待顯示的數(shù)組                                                  *
//返  回:無                                                                *
//內(nèi)部調(diào)用函數(shù):LCD_Command                                                 *
//-------------------------------------------------------------------------*
void LCDShow(INT8U str[])
{
    INT8U i;
    //1. LCD初始化
    LCDInit();
    //2. 顯示第1行16個字符
    //2.1設置顯示首地址
    LCDCtrl &= ~(1 << LCDRS);    //RS,R/W = 00(寫的是指令)
    LCDCtrl &= ~(1 << LCDRW);
    LCD_Command(0x80);           //后7位為DD RAM地址(0x00)
    //2.2寫16個數(shù)據(jù)到DD RAM
    LCDCtrl |=   1 << LCDRS;     //RS,R/W = 10(寫的是數(shù)據(jù))
    LCDCtrl &= ~(1 << LCDRW);
    //將要顯示在第1行上的16個數(shù)據(jù)逐個寫入DD RAM中
    for (i = 0;i < 16;i++)
    {
        LCD_Command(str[i]);
    }
    //3. 顯示第2行16個字符
   	//3.1設置顯示首地址
   	LCDCtrl &= ~(1 << LCDRS);    //RS,R/W = 00(寫的是指令)
    LCDCtrl &= ~(1 << LCDRW);
    LCD_Command(0xC0);           //后7位為DD RAM地址(0x40)
    //3.2再寫16個數(shù)據(jù)到DD RAM
    LCDCtrl |=   1 << LCDRS;     //RS,R/W = 10(寫的是數(shù)據(jù))
    LCDCtrl &= ~(1 << LCDRW);
    //將要顯示在第2行上的16個數(shù)據(jù)逐個寫入DD RAM中
    for (i = 16;i < 32;i++)
    {
        LCD_Command(str[i]);
    }
}

//LCD_Command:執(zhí)行給定的cmd命令--------------------------------------------*
//功  能:執(zhí)行給定的cmd命令,且延時                                          *
//參  數(shù):cmd=待執(zhí)行的命令                                                  *
//返  回:無                                                                *
//-------------------------------------------------------------------------*
void LCD_Command(unsigned char cmd)
{	 	
    INT8U i;
    //1.等待 > 40us
    for (i=0; i<200; i++);
    for (i=0; i<200; i++);
    for (i=0; i<200; i++);
    for (i=0; i<200; i++);
    //2.數(shù)據(jù)送到LCD的數(shù)據(jù)線上 
    LCDData = cmd;
    //3.給出E信號的下降沿,使數(shù)據(jù)寫入LCD
    LCDCtrl |= (1<<LCDE);
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");
    asm("NOP");    
    LCDCtrl &= ~(1<<LCDE);    //Lcd結(jié)束接收數(shù)據(jù)
    //4.等待 > 40us
    for (i=0; i<200; i++);
    for (i=0; i<200; i++); 
    for (i=0; i<200; i++); 
    for (i=0; i<200; i++); 
}