/*
	main.c
	16×16 LED點(diǎn)陣的掃描顯示：滾動(dòng)顯示文字
*/


#include "Zimo.h"
#include <reg51.h>
#include <ctype.h>


//設(shè)置屏幕滾動(dòng)速度（單位：×10ms）
#define SCROLL_SPEED	15


//定義I/O端口
sbit STR = P1^3;	//74HC595存儲(chǔ)寄存器時(shí)鐘（Storage register clock）
sbit SI = P1^4;		//74HC595串行輸入信號(hào)（Serial Input）
sbit SCK = P1^5;	//74HC595移位寄存器時(shí)鐘（Shift register clock）


//定義顯示緩沖區(qū)（在T1定時(shí)中斷里掃描）
unsigned char data DispBuf[32];


/*
函數(shù)：SysInit()
功能：系統(tǒng)初始化
*/
void SysInit()
{
	unsigned char i;
	for ( i=0; i<32; i++ )
	{
		DispBuf[i] = 0x00;
	}
	STR = 1;
	SI = 0;
	SCK = 0;
	TMOD &= 0xF0;
	TMOD |= 0x01;
	TMOD &= 0x0F;
	TMOD |= 0x10;
	TH1 = 0xFC;
	TL1 = 0x66;
	TR1 = 1;
	ET1 = 1;
	EA = 1;
}


/*
函數(shù)：Delay()
功能：延時(shí)10ms～2.56s
參數(shù)：
	t>0時(shí)，延時(shí)(t*10)ms
	t=0時(shí)，延時(shí)2.56s
*/
void Delay(unsigned char t)
{
	do
	{
		TH0 = 0xDC;
		TL0 = 0x66;
		TR0 = 1;
		while ( !TF0 );
		TR0 = 0;
		TF0 = 0;
	}while ( --t != 0 );
}


/*
函數(shù)：PutChar()
功能：滾動(dòng)顯示一個(gè)字母或漢字
參數(shù)：
	c：字母或漢字的編碼
	當(dāng)c>=0x80時(shí)，視為一個(gè)漢字
*/
void PutChar(unsigned char c)
{
	unsigned int a;		//地址變量
	unsigned char i,j;	//循環(huán)變量
	unsigned char t;	//臨時(shí)變量
	unsigned char code *Tab;	//指針，用于查表
	t = 8;
	if ( c >= 0x80 )	//如果c是漢字
	{
		t = 16;
		a = 32 * ( c - 0x80 );
		Tab = HanziTab;
	}
	else if ( isupper(c) )	//如果c是大寫字母
	{
		a = 16 * ( c - 'A' );
		Tab = UpperTab;
	}
	else if ( islower(c) )	//如果c是小寫字母
	{
		a = 16 * ( c - 'a' );
		Tab = LowerTab;
	}
	else	//如果是其它字符
	{
		return;
	}
	for ( j=0; j<t; j++ )
	{
		for ( i=0; i<15; i++ )
		{
			DispBuf[i] = DispBuf[i+1];
			DispBuf[16+i] = DispBuf[17+i];
		}
		DispBuf[i] = Tab[a+j];
		DispBuf[16+i] = Tab[a+j+t];
		Delay(SCROLL_SPEED);
	}
}


/*
函數(shù)：PutStr()
功能：滾動(dòng)顯示一個(gè)文字串
參數(shù)：
	*str：以'\0'結(jié)尾的文字串
	*str可以同時(shí)包含字母和漢字，其中漢字必須是小漢字庫內(nèi)的漢字
*/
void PutStr(unsigned char code *str)
{
	unsigned char c;
	for (;;)
	{
		c = *str++;
		if ( c == '\0' ) break;
		PutChar(c);
	}
}



/*
函數(shù)：T1INTSVC()
功能：T1中斷服務(wù)函數(shù)
*/
void T1INTSVC() interrupt 3 using 2
{
	code unsigned char Tab[] =
	{//定義掃描數(shù)據(jù)表
		0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x7F,0xBF,0xDF,0xEF,0xF7,0xFB,0xFD,0xFE,
		0x7F,0xBF,0xDF,0xEF,0xF7,0xFB,0xFD,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF
	};
	static unsigned char n = 0;		//局部靜態(tài)變量，用于查表
	unsigned char i,j;		//循環(huán)變量
	unsigned char d;		//臨時(shí)變量
	unsigned char data buf[4];	//臨時(shí)數(shù)組，用于向74HC595發(fā)送數(shù)據(jù)
//處理定時(shí)器T1
	TR1 = 0;
	TH1 = 0xFC;
	TL1 = 0x66;
	TR1 = 1;
//查表，取得要發(fā)送的數(shù)據(jù)
	buf[0] = Tab[n];
	buf[1] = Tab[16+n];
	buf[2] = DispBuf[16+n];
	buf[3] = DispBuf[n];
	n++;
	n &= 0x0F;
//向74HC595發(fā)送數(shù)據(jù)
	STR = 0;
	for ( i=0; i<4; i++ )
	{
		d = buf[i];
		j = 8;
		do
		{
			SI = (bit)(d & 0x01);
			SCK = 1;
			d >>= 1;
			SCK = 0;
		} while ( --j != 0 );
	}
	STR = 1;
}


void main()
{
	//定義文字串
	code unsigned char s[] =
	{
		0x81,	//歡
		0x82,	//迎
		0x83,	//使
		0x84,	//用
		'S','m','a','r','t','S','O','P','C',
		0x85,	//教
		0x86,	//學(xué)
		0x87,	//實(shí)
		0x88,	//驗(yàn)
		0x89,	//開
		0x8A,	//發(fā)
		0x8B,	//平
		0x8C,	//臺(tái)
		0x80,	//　（全角空白）
		'\0'
	};
	SysInit();
	for (;;)
	{
		PutStr(s);
	}
}