/**********************************************
*		File: T0IntLEDsExample.c
*	  Description: LEDs T0 Int Triggle
*	  Created Date:  2007-09-14
*   Last Modified: 2007-09-14
*   Author: Jeffrey - Schicksal@126.com
*   Notes: None
**********************************************/

#include <REGX51.h>

#define TH0_VALUE 0x06
#define TL0_VALUE 0x00

unsigned int timer_tick;
unsigned int timer_tick_1s;

void LEDs_Move();
void LEDs_Error();
void LEDs_Gragon();
void TIMER_Init();
void TIMER_Start();

#ifndef true
	#define true 1
#endif

#define TASK_1 1
#define TASK_2 2

/**********************************************
*		Function: main()
*	  Input Variables: None
*   Return Variables: None
*   Usage: Program Entry
*********************************************/
void main()
{
		unsigned char System_Status = true;
		unsigned char System_Task = TASK_2;		
		
		TIMER_Init();											// 初始化T0
		TIMER_Start();										// 啟動T0
		while(1)
		{
				// 程序主任務區
				// ............
				// 程序主任務區
				
				if(System_Status != true)			// 當系統發生錯誤
				{
						EA = 0;										// 關中斷
						LEDs_Error();							// 跑馬燈指示錯誤
						EA = 1;										// 開中斷
				}				
		}
}

/**********************************************
*		Function: LEDs_Move
*	  Input Variables: None
*   Return Variables: None
*   Usage: System Normal Status Report
*********************************************/
void LEDs_Move()
{
	 	static unsigned char LEDs = 0x55;		// 靜態變量用于存儲LEDs發光狀態
	 	P0 = LEDs;						// LED間隔亮滅并移位
		delay(LED_FLASH_T);		// 延時
		LEDs = ~LEDs;					// 狀態改變
}

/**********************************************
*		Function: LEDs_Error
*	  Input Variables: None
*   Return Variables: None
*   Usage: System Error Status Report
*********************************************/
void LEDs_Error()
{
	 	static unsigned char LEDs = 0x00;   // 靜態變量用于存儲LEDs發光狀態
	 	P0 = LEDs;						// LED警告報警亮滅
		delay(LED_FLASH_T);		// 延時
		LEDs = ~LEDs;					// 狀態改變
}

/**********************************************
*		Function: LEDs_Dragon
*	  Input Variables: None
*   Return Variables: None
*   Usage: System Dragon LED Animation
*********************************************/
void LEDs_Dragon()
{
	static unsigned char Direction = 1;         // 靜態變量用于存儲龍舞方向
	static unsigned char LED_status = 0x0F;     // 靜態變量用于存儲LEDs發光狀態
	if(Direction==1)
	{
		if(LED_status>=0x0F)
			LED_status=LED_status<<1;
		else if(LED_status==0x07)
			LED_status=0x0F;
		else if(LED_status==0x03)
			LED_status=0x07;
		else 
			LED_status=0x03;
		if(LED_status==0xC0)
			Direction=0;
	}
	else 
	{ 
		if(LED_status==0xE0)
			LED_status=0xF0;
		if(LED_status==0xC0)
			LED_status=0xE0;
		else if(LED_status<=0xF0)
			LED_status=LED_status>>1;
		if(LED_status==0x03)
			Direction=1;
	}
	
	P0=~LED_status;
}

/**********************************************
*		Function: TIMER_Init
*	  Input Variables: None
*   Return Variables: None
*   Usage: T0 Initialization
*********************************************/
void TIMER_Init(void)
{
	
	ET0 = 0;					// 關閉T0的中斷
	TMOD = 0x00;			// T0工作在模式0
	TCON = 0x00;			// 暫時未啟動T0
	TL0 = TL0_VALUE;
	TH0 = TH0_VALUE;	// 產生2ms中斷 |24 MHz 晶振
	ET0 = 1;				  // 打開T2的中斷

	timer_tick = 0;
	timer_tick_1s = 0;
}

/**********************************************
*		Function: timer0_interrupt
*	  Input Variables: None
*   Return Variables: None
*   Usage: TIMER_Interrupt Service Routine 
*********************************************/
void timer0_interrupt(void) interrupt 5 using 1 
{		  
	EA = 0;												  // 關全局中斷
	TF0 = 0;												// 清中斷標志
	
	timer_tick++;										// 2ms

	if ( timer_tick == 500 )  			// 1s = 2ms X 500
	{
			timer_tick_1s += 1;					// 秒計數增1
			timer_tick = 0;							// 2ms計數清零
			void LEDs_Dragon();					// 龍舞花樣狀態變換
	}
	
	TL0 = TL0_VALUE;								// T0初值裝載
	TH0 = TH0_VALUE;								// 產生2ms中斷 |24 MHz 晶振
  EA = 1;													// 開中斷
}

/**********************************************
*		Function: TIMER_Start
*	  Input Variables: None
*   Return Variables: None
*   Usage: Start T0 
*********************************************/
void TIMER_Start()
{
	TR0 = 1;				// 啟動T0
}