/********************************************************************************************************
說明: 使用了外部中斷4,定時器中斷1,實現了跑馬燈程序
本程序通過按鍵S1改變LED燈工作的數量,按鍵S2改變LED燈閃爍的頻率,實現跑馬燈的效果  
要求:打開撥碼開關J8
*********************************************************************************************************/
#include <sh88f516.h>

unsigned char Num,Fnum;
unsigned char Disp;
unsigned char Time0Count;
bit DispFlag; 
void mcu_init();

main()
{

	mcu_init();
					
    while(1)
	{

		if(DispFlag)
		{
			DispFlag = 0;

	    	P0 = (P0&0xFC) | (Disp&0x03);		//端口0的低2位對應LED燈的D2 D3
			P1 = (P1&0x03) | (Disp&0xFC);	    //端口1的高6位對應LED燈的D4-D9

			Disp <<= 1;
			if(CY)
			    Disp |= 0x01;
		}

	}

}



void mcu_init()
{

	CLKCON = 0x60;	//系統頻率=晶振頻率/12

	P0M0 = 0x00;
	P0M1 = 0xFF;	//推挽輸出模式

	P1M0 = 0x00;
	P1M1 = 0xFF;	//推挽輸出模式

	IENC = 0x70;	//0111 0000 外部中斷4的選擇寄存器,1-打開,0-關閉
	EXF0 = 0x80;	//上升沿觸發

	TH0 = 0xFA;
	TL0 = 0x00;	
	TMOD = 0x01;	// Timer 0 is 16-bit counter, timer mode
	ET0 = 1;	    //enable timer 0 interrupt
	TR0 = 1;	    //enable timer 0

	IEN1 = 0x40;	//ELPD EX4  EPWM ESCM    ECMP1 ES1 ECMP0 ESPI	 0100 0000
	EA = 1;			//開啟總中斷

	Num = 0;
	Fnum = 4;
	DispFlag = 1;
	P0 = 0;
	P1 = 0;
	P2 =P2 |0x80;
	Disp = 0x01;


}

void Timer0_int() interrupt 1
{
	Time0Count++;
	if(Time0Count>=Fnum)
	{
		Time0Count = 0;
		DispFlag = 1;
	}
}


void EX4_INT() interrupt 13  //using 2  //外部中斷4的中斷號為13.
{
	
	IEN1 &= 0xBF;

	if(IF45)				 //P2.5對應于板子上的S2
	{	
		Fnum--;
		if(Fnum==0)
		    Fnum = 6;

	}

	if(IF46)				 //P2.6對應于板子上的S1
	{	
		Num++;     
		if(Num==5)
		    Num  = 0;

		switch(Num)
		{
		    case 0:   Disp = 0x01;
			      break;
			case 1:   Disp = 0x03;
			      break;
			case 2:   Disp = 0x0F;
			      break;
			case 3:   Disp = 0x11;
			      break;
			case 4:   Disp = 0x55;
			      break;
			default:  Disp = 0x00;
			      break;
		}

	}



	EXF1 = 0x00;			 //需要軟件清0

	IEN1 |= 0x40;

}