thestatus.c

用跑马灯指示单片机的工作状态

/**********************************************
*		File: TheStatus.c
*	  Description: MCU Status report with LEDs
*	  Created Date:  2007-09-12
*   Last Modified: 2007-09-12
*   Author: Jeffrey - [e-mail]
*   Notes: None
**********************************************/

#include <REGX51.h>
#define LED_FLASH_T 10000;

void LEDs_Move();
void LEDs_Error();

/**********************************************
*		Function: delay(unsigned int t)
*	  Input Variables: t
*   Return Variables: None
*   Usage: Common Delay Routine, t as the delay time ticks
**********************************************/
void delay(unsigned int t)
{
		for(;t>0;t--);		// 延时循环
}

#ifndef true
	#define true 1
#endif

/**********************************************
*		Function: main()
*	  Input Variables: None
*   Return Variables: None
*   Usage: Program Entry
*********************************************/
void main()
{
		unsigned char System_Status;		
		while(1)
		{
				// 程序主任务区
				// ............
				// 程序主任务区
				if(System_Status == true)			// 当系统处于正常状态
				{
						LEDs_Move();							// 跑马灯指示系统正常
				}
				else													// 当系统发生错误
				{
						LEDs_Error();							// 跑马灯指示错误
				}
				
		}
}

/**********************************************
*		Function: LEDs_Move
*	  Input Variables: None
*   Return Variables: None
*   Usage: System Normal Status Report
*********************************************/
void LEDs_Move()
{
	 	static unsigned char LEDs = 0x55;		// 静态变量用于存储LEDs发光状态
	 	P0 = LEDs;						// LED间隔亮灭并移位
		delay(LED_FLASH_T);		// 延时
		LEDs = ~LEDs;					// 状态改变
}

/**********************************************
*		Function: LEDs_Error
*	  Input Variables: None
*   Return Variables: None
*   Usage: System Error Status Report
*********************************************/
void LEDs_Error()
{
	 	static unsigned char LEDs = 0x00;   // 静态变量用于存储LEDs发光状态
	 	P0 = LEDs;						// LED警告报警亮灭
		delay(LED_FLASH_T);		// 延时
		LEDs = ~LEDs;					// 状态改变
}