typedef struct
{
 unsigned char b7 :1; /*!< byte<7> */
 unsigned char  b6 :1; /*!< byte<6> */
 unsigned char  b5 :1; /*!< byte<5> */
 unsigned char  b4 :1; /*!< byte<4> */
 unsigned char  b3 :1; /*!< byte<3> */
 unsigned char  b2 :1; /*!< byte<2> */
 unsigned char  b1 :1; /*!< byte<1> */
 unsigned char  b0 :1; /*!< byte<0> */
} BIT8_t;         /*!<  8bit structure  */

typedef struct
{
 unsigned int b15:1; /*!< word<15> */
 unsigned int b14:1; /*!< word<14> */
 unsigned int b13:1; /*!< word<13> */
 unsigned int b12:1; /*!< word<12> */
 unsigned int b11:1; /*!< word<11> */
 unsigned int b10:1; /*!< word<10> */
 unsigned int b9 :1; /*!< word<9> */
 unsigned int b8 :1; /*!< word<8> */

 unsigned int b7 :1; /*!< word<7> */
 unsigned int b6 :1; /*!< word<6> */
 unsigned int b5 :1; /*!< word<5> */
 unsigned int b4 :1; /*!< word<4> */
 unsigned int b3 :1; /*!< word<3> */
 unsigned int b2 :1; /*!< word<2> */
 unsigned int b1 :1; /*!< word<1> */
 unsigned int b0 :1; /*!< word<0> */
} BIT16_t;         /*!< 16bit structure  */

typedef struct
{
 unsigned long b31:1; /*!< dword<31> */
 unsigned long b30:1; /*!< dword<30> */
 unsigned long b29:1; /*!< dword<29> */
 unsigned long b28:1; /*!< dword<28> */
 unsigned long b27:1; /*!< dword<27> */
 unsigned long b26:1; /*!< dword<26> */
 unsigned long b25:1; /*!< dword<25> */
 unsigned long b24:1; /*!< dword<24> */

 unsigned long b23:1; /*!< dword<23> */
 unsigned long b22:1; /*!< dword<22> */
 unsigned long b21:1; /*!< dword<21> */
 unsigned long b20:1; /*!< dword<20> */
 unsigned long b19:1; /*!< dword<19> */
 unsigned long b18:1; /*!< dword<18> */
 unsigned long b17:1; /*!< dword<17> */
 unsigned long b16:1; /*!< dword<16> */

 unsigned long b15:1; /*!< dword<15> */
 unsigned long b14:1; /*!< dword<14> */
 unsigned long b13:1; /*!< dword<13> */
 unsigned long b12:1; /*!< dword<12> */
 unsigned long b11:1; /*!< dword<11> */
 unsigned long b10:1; /*!< dword<10> */
 unsigned long b9 :1; /*!< dword<9> */
 unsigned long b8 :1; /*!< dword<8> */

 unsigned long b7 :1; /*!< dword<7> */
 unsigned long b6 :1; /*!< dword<6> */
 unsigned long b5 :1; /*!< dword<5> */
 unsigned long b4 :1; /*!< dword<4> */
 unsigned long b3 :1; /*!< dword<3> */
 unsigned long b2 :1; /*!< dword<2> */
 unsigned long b1 :1; /*!< dword<1> */
 unsigned long b0 :1; /*!< dword<0> */
} BIT32_t;         /*!< 32bit structure  */

typedef union
{
 unsigned char  byte;
 BIT8_t  BIT;
} UINT8u_t;         /*!<  8bit union structure */

typedef union
{
 unsigned int word;
 unsigned char  byte[2];
 BIT16_t  BIT;
} UINT16u_t;        /*!< 16bit union structure */

typedef union
{
 unsigned long dword;
 unsigned int word[2];
 unsigned char byte[4];
 BIT32_t  BIT;
}UINT32u_t;        /*!< 32bit union structure */

UINT32u_t KeyInTempBuffer,KeyBuff;

void KeyInDetect(void)
{
 KeyBuff.byte[ucScanPosition]=PINC & 0x1f;

    if(KeyInTempBuffer.dword== KeyBuff.dword){
        if(KeyInCount== 5) {
         KeyInCount=6;
         InputCurKey=KeyInTempBuffer.dword;
         ucKeyIndex=GetKeyIndex(InputCurKey);

        }
        else{
        if(KeyInCount<5){
    KeyInCount++;
        }
        else{
    if(KeyStatus.Usable == DISABLE) {
     KEY_CheckValidKey();
    }
        }
     }
    }
    else{
        KeyInTempBuffer.dword = KeyBuff.dword;
        KeyInCount=0;
        InputCurKey = KEY_NO_INPUT;
    }

 if(++ucScanPosition>3){
  ucScanPosition=0;
 }
 PORTA=(PINA & 0xf0) | TblKeyScan[ucScanPosition];
}