led.c

利用winavr开发的一款三段式充电器的源码

/*****************************************************************
** Project：		充电器
** file : 			led.c
** date : 			20081205
** author：
** version：		v1.0		   
** description:		主体功能实现
** ---------------------------------------------------------------
** date : 			 
** author：
** version：		 	   
** description:		 
******************************************************************/

//包含总头文件
#include "main.h"

//用于存放各个led瞬态值
u08 led[] 			= { OFF,OFF,OFF,ON };
//用于缓冲存放led的瞬态值
u08 led_buf[] 		= { OFF,OFF,OFF,OFF };
//用于表征各个led是否闪烁
u08 led_flash[]	= { OFF,OFF,OFF,OFF};
//闪烁控制
u08 led_state = DARK;

//====================================================================
//用于设定各led灯的明暗，亮闪
//====================================================================
void SetLed( u08 Which, u08 OnOrOff, u08 Flash )
{
	if( Which >=_LED_ERR ) 

		Which = _LED_ERR;//防止控制变量数组下标溢出

	led			[ Which ] = OnOrOff;

	led_flash	[ Which ] = Flash ;
}

//====================================================================
//灯闪亮情况综合处理，将灯的瞬态亮暗情况送至led[]寄存器
//该函数在中断中，调用。在一秒的软件计时节拍中，反复反转led_state
//====================================================================
void LedProc(void)
{
	u08 i;
	///////////////////////////////////
	for( i =0 ; i <= _LED_ERR ; i++   )
	{
		if( led_flash[i] == ON  )
		{
			led_buf[i] = led[i] && led_state;
		}
		else
		{
			led_buf[i] = led[i];
		}
	}
	////////////////////////////////////
	LedUpdate();
}

//====================================================================
//将各灯的瞬间的明暗传递到物理端口
//实现瞬间led的点亮或者关闭。
//====================================================================

void LedUpdate(void)
{
	//LED1 灯明暗处理
	if( led_buf[_LED1] == ON)
	{
		STAGE_1_LED = LED_ON;
	}
	else
	{
		STAGE_1_LED = LED_OFF;
	}
	//LED2 灯明暗处理
	if( led_buf[_LED2] == ON)
	{
		STAGE_2_LED = LED_ON;
	}
	else
	{
		STAGE_2_LED = LED_OFF;
	}
	//LED1 灯明暗处理
	if( led_buf[_LED3] == ON)
	{
		STAGE_3_LED = LED_ON;
	}
	else
	{
		STAGE_3_LED = LED_OFF;
	}
	//LED1 灯明暗处理
	if( led_buf[_LED_ERR] == ON)
	{
		ERROR_LED = LED_ON;
	}
	else
	{
		ERROR_LED = LED_OFF;
	}
}



/*********定时器0的中断，来产生系统工作的基本时序**************/
SIGNAL(SIG_OVERFLOW0)
{
	static unsigned int i;

    TCNT0           = T0_BGN_VAL; 

	if( i++ > 1000)
	{
		i =0 ;

		//翻转明暗状态
		if( led_state == DARK )
		{
			led_state = LIGHT;

		}
		else 
		if( led_state == LIGHT)
		{
			led_state = DARK;
		}
		//每秒中更新led端口状态。
		LedProc();                      
	}
}