一种BCD码转换的算法

 #include "stdio.h"

 typedef unsigned char            uint8_t;
 typedef unsigned short            uint16_t;
 typedef unsigned int            uint32_t;
 typedef unsigned long long        uint64_t;

 /**
 ***************************************************************************************************
 * @Brief     Decimal convert BCD code
 * @Param     _Dec    Decimal    (Max: 2^64)
 *            _Buf    BCD code buffer
 *            _Num    Decimal digit
 * @RetVal    None
 * @Note      None
 ***************************************************************************************************
 */
 void Dec_to_BCD(uint64_t _Dec, uint8_t* _Buf, uint8_t _Num)
 {
     uint8_t i, n;
     uint8_t flag = ;    /* BCD码高低字节存放控制标志 */ 

     /* 内部计算 _Dec 的位数，可省去形参 _Num */
     #if    0
     uint8_t _Num;
     uint64_t temp = _Dec;
     do
     {
         _Num++;
         temp /= ;
     }while(temp);
     #endif

     for(i = ; i < _Num; i++)
     {
         if(flag)    /* 低字节 */
         {
             _Buf[i/] = (_Dec % ) & 0x0F;
             flag = ;
         }
         else        /* 高字节 */
         {
             _Buf[i/] |= ((_Dec % ) & 0x0F) << ;;
             flag = ;
         }
         _Dec /= ;
     }
 }

 int main(void)
 {
     uint8_t i;
     uint8_t buf[] ={};

     printf("This is example!\n");

     Dec_to_BCD(, buf, );

     for(i = ; i < ; i++)
     {
         printf("%#X\n", buf[i]);
     }

     return ;
 }