BCD to Binary

[PabloA]

Hi every body!.

I include in my proyect a Real Time Keeper that give me all time data in BCD format and I need to store  data in a RAM Buffer that is addressed with the hour data, but I can't use BCD format to address.

So any body know any way to convert BCD format to Binary? I need to convert BCD to binary from "0" to "23".

Thanks you for your interest.

Pablo.

[bigmac]

Hello Pablo,

Assuming "packed BCD" format, with both decimal digits contained within the same byte, here is a possible C function -

byte BCDconvert (byte BCDval)

{

   return (((BCDval & 0x30) >> 4) * 10 + (BCDval & 0x0F));

}

Here is the same process written in assembler -

BCDconvert:

   lda   BCDval

   and   #$30

   nsa

   ldx   #10

   mul

   psha

   lda   BCDval

   and   #$0F

   add   1,sp

   ais   #1     ; Adjust stack pointer

   rts

   ; On exit, ACC contains the binary value

Regards,

Mac

[PabloA]

Dear Mac:

I work perfectly. Just what I need.

Thank you.

Best regards.

Pablo