#include <hal.h>
#include "cfg/al_helper.h" 
#include "key.h" 
#include "key_cfg.h"  

XDATA unsigned char gcOldKey = 0;
XDATA unsigned char gcKeyFilter = 0;
XDATA unsigned char gcKeyStack[MAX_KEY_STACK] = {"\0"};
XDATA unsigned char gcKeySavePtr= 0;
XDATA unsigned char gcKetGetPtr = 0;
XDATA signed   char gcBLTimer 			  = -1;		     
XDATA unsigned char gcKey = 0;								 //键盘键值							

void Beep(uint8_t count,uint16_t freq)
{
    UNUSED(count);
    UNUSED(freq);
}

void InitKey(void)
{
    GPIO_Init(GPIO_KEY,GPIO_PIN_KEY,GPIO_MODE_IN_PU);  //,GPIO_PIN_KEY 
    //GPIO_WriteHigh(GPIO_KEY,GPIO_PIN_KEY);
    _nop_();
}

//void TaskScanKey(void)
 
#if TASK_WITH_PT 
PT_THREAD(TaskScanKey(struct pt *pt1 ))  
#else 
PT_THREAD(TaskScanKey(void))  
#endif   
{		
	unsigned char Key = GPIO_ReadPort(GPIO_KEY);  //,GPIO_PIN_KEY
    _nop_();
	Key = Key&KEY_MAP;
	if(Key!=0x0)
	{										  
		if(Key!=gcOldKey)    			//digit filter
		{
			gcOldKey=Key;
			gcKeyFilter=0;
			Beep(1,100); 
		}
		else
		{								 //长按不放的情况
			gcKeyFilter++;
	
			if( gcKeyFilter>MAX_KEY_FILTER)        //save key to stack
			{			   															                     
			  //if((Key&KEY_LOCK)!=KEY_LOCK)	   
				//键值过滤  锁定键不允许连击 
				{	
					gcKeyFilter=0;	   
					gcKeyStack[gcKeySavePtr]=Key;
					gcKeySavePtr=(gcKeySavePtr+1)%MAX_KEY_STACK;  
					Beep(1,50);           //beep 10ms					 
				}	   
			} 
		}             
	}
	else
	{
		if(gcKeyFilter>2)			//延时去抖动 ,按键松开的情况
		{
			gcKeyFilter=0;
			gcKeyStack[gcKeySavePtr]=gcOldKey;
			gcKeySavePtr=(gcKeySavePtr+1)%MAX_KEY_STACK;
			Beep(1,100);           //beep 10ms				  
		}	 
	}
	#ifdef _DEBUG								 
	//printf("Key = 0x%X \n",(int)Key);	
	#endif
 
    UNUSED(pt1);   
    return 0;
}
																				  
														   
/**************************************************************************
    get key code,return 0 if no key
***************************************************************************/
unsigned char GetKey(void)
{
    unsigned char ret;

    if(gcKetGetPtr!=gcKeySavePtr)
    {
        ret=gcKeyStack[gcKetGetPtr];
        gcKetGetPtr=(gcKetGetPtr+1)%MAX_KEY_STACK;
    }
    else
        ret=0;	
    return ret;
}