> -----Original Message-----
> From: Graham North [SMTP:graham_from_malton@YAHOO.CO.UK]
> Sent: Friday, September 26, 2003 1:46 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [PIC]: Hi Tech BCD to Bin routine?
>
> Hi everyone,
>
> Can someone help me by telling me how to convert BCD to Binary? I'm having
> a bad day! :-(
>
> Cheers
>
> Graham
>
Is the BCD packed (i.e. two digits per byte) or unpacked (one digt per byte)
and how many digits?

The technique is very simple if you are not overly concerned about
efficiency (speed in this case).


unsigned int Bcd2Bin(unsigned int bcd)
{
        // convert 4 digit packed BCD to binary

        unsigned int bin;

        bin= bcd & 0x000F;              // get units

        bdc >>= 4;
        bin+= (bcd & 0x000F) * 10;              // add  tens

        bdc >>= 4;
        bin+= (bcd & 0x000F) * 100;             // add hundreds

        bdc >>= 4;
        bin+= (bcd & 0x000F) * 1000;    // add thousands

        return bin;
}

This is as basic as it gets, you should be able to significantly speed this
up with a little thought.  The method is the same for unpacked BCD, but
obviously you only have to deal with the lower nibble in each byte.

For some very fast methods check out the piclist web site.  You will almost
certainly need to use inline assembly to use them however.

Mike




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