/*
	main.c
	串行口通信例程A：串行口方式0
*/


#include <reg51.h>


//定義I/O端口
sbit STR = P1^3;	//74HC595存儲寄存器時鐘（Storage register clock）
//sbit SI = P3^0;	//74HC595串行輸入信號（Serial Input）
//sbit SCK = P3^1;	//74HC595移位寄存器時鐘（Shift register clock）


//定義漢字點陣數據表
code unsigned char Zimo[32] =
{
	//文字：漢，字體：Fixedsys12，大?。?6×16，取模方式：縱向取模、字節正序
	0x08,0x06,0x80,0x61,0x06,0x20,0x38,0x27,0x20,0x20,0x20,0x27,0x38,0x20,0x00,0x00,
	0x20,0x20,0x7E,0x80,0x02,0x04,0x04,0x08,0xD0,0x20,0xD0,0x08,0x0C,0x06,0x04,0x00
};


/*
函數：SysInit()
功能：系統初始化
*/
void SysInit()
{
	STR = 1;
	SCON = 0x00;	//設置串行口工作在方式0（同步移位寄存器）
	TMOD &= 0x0F;
	TMOD |= 0x10;
	TH1 = 0xFC;
	TL1 = 0x66;
	TR1 = 1;
	ET1 = 1;
	EA = 1;
}


/*
函數：T1INTSVC()
功能：T1中斷服務函數
*/
void T1INTSVC() interrupt 3
{
	code unsigned char Tab[] =
	{//定義掃描數據表
		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;		//局部靜態變量，用于查表
	unsigned char i;		//循環變量
	unsigned char buf[4];	//臨時數組，用于向74HC595發送數據
//處理定時器T1
	TR1 = 0;
	TH1 = 0xFC;
	TL1 = 0x66;
	TR1 = 1;
//查表，取得要發送的數據
	buf[0] = Tab[n];
	buf[1] = Tab[16+n];
	buf[2] = Zimo[16+n];
	buf[3] = Zimo[n];
	n++;
	n &= 0x0F;
//向74HC595發送數據
	STR = 0;
	for ( i=0; i<4; i++ )
	{
		SBUF = buf[i];		//通過串行口發送數據
		while ( !TI );
		TI = 0;
	}
	STR = 1;
}


void main()
{
	SysInit();
	for (;;)
	{
	}
}