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BCD to binary

 
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Ed Arnold



Joined: 02 Nov 2003
Posts: 18

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BCD to binary
PostPosted: Sat Apr 10, 2004 8:38 pm     Reply with quote
I have created a conversion between BCD to binary so that I can manage data from a DS1307 RTC a little easier. When I use the following function, it usually returns zero. I also have a binary to BCD conversion, but it seem to work okay. Any feedback would be helpful.

Code:

read_RTC();
for(i=2;i>0;i--)
    {
       time[i]=bcd2bin(RTC_time[i]);
    }

byte bcd2bin(byte bcd_val)
{
 byte bin_val;
  while(bcd_val>=0x10)
    {
      bin_val+=10;
      bcd_val-=0x10;
    }
  bin_val+=bcd_val;
  return(bin_val);
}


Thanks

Ed Arnold
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Apr 10, 2004 11:35 pm     Reply with quote
If you're searching for a bcd2bin() function, there's one at the end of this
thread, that avoids the use of the multiply routine.
http://www.ccsinfo.com/forum/viewtopic.php?t=18830&highlight=bcd2bin

There's another one at the end of this thread that uses multiply.
If code space is not a worry, then it has fewer lines of code than
the one above:
http://www.ccsinfo.com/forum/viewtopic.php?t=17668&highlight=bcd2bin
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