/*
	Disp.c
	數(shù)碼管掃描顯示驅(qū)動程序
*/


#include <reg51.h>
#include <absacc.h>


//定義顯示緩沖區(qū)（由定時中斷程序自動掃描）
unsigned char DispBuf[8];


/*
函數(shù)：T1INTSVC()
功能：定時器T1的中斷服務函數(shù)
*/
void T1INTSVC() interrupt 3
{
	code unsigned char com[] = {0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
	static unsigned char n = 0;
	TR1 = 0;
	TH1 = 0xFC;
	TL1 = 0x66;
	TR1 = 1;
	P1 = 0xFF;		//暫停顯示
	XBYTE[0xE800] = ~DispBuf[n];	//更新掃描數(shù)據(jù)
	P1 = ~com[n];	//重新顯示
	n++;
	n &= 0x07;
}


/*
函數(shù)：DispClear()
功能：清除數(shù)碼管的所有顯示
*/
void DispClear()
{
	unsigned char i;
	for ( i=0; i<8; i++ )
	{
		DispBuf[i] = 0x00;
	}
}


/*
函數(shù)：DispChar()
功能：在數(shù)碼管上顯示字符
參數(shù)：
	x：數(shù)碼管的坐標位置（0～7）
	c：要顯示的字符（僅限十進制數(shù)字和減號）
*/
void DispChar(unsigned char x, unsigned char c)
{
	//0123456789的數(shù)碼管字型數(shù)據(jù)
	code unsigned char Tab[] = {0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
	x &= 0x07;
	x = 7 - x;
	if ( c == '-' )
	{
		DispBuf[x] = 0x40;
	}
	else if ( ( c >= '0' ) && ( c <= '9' ) )
	{
		DispBuf[x] = Tab[c-'0'];
	}
}


/*
函數(shù)：DispStr()
功能：在數(shù)碼管上顯示字符串
參數(shù)：
	x：數(shù)碼管的坐標位置（0～7）
	*s：要顯示的字符串（字符僅限十進制數(shù)字和減號）
*/
void DispStr(unsigned char x, unsigned char *s)
{
	unsigned char c;
	for (;;)
	{
		c = *s;
		if ( c == '\0' ) break;
		s++;
		DispChar(x,c);
		x++;
	}
}


/*
函數(shù)：DispDotOn()
功能：顯示指定位的小數(shù)點
參數(shù)：x為數(shù)碼管坐標
*/
void DispDotOn(unsigned char x)
{
	DispBuf[7-x] |= 0x80;
}


/*
函數(shù)：DispInit()
功能：數(shù)碼管掃描顯示初始化
*/
void DispInit()
{
	DispClear();
	EA = 0;
	TMOD &= 0x0F;
	TMOD |= 0x10;
	TH1 = 0xFC;
	TL1 = 0x66;
	TR1 = 1;
	ET1 = 1;
	EA = 1;
}