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BCD to byte and back

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picker

Joined: 07 Sep 2003
Posts: 19
Location: South Africa

BCD to byte and back
Posted: Mon Jan 05, 2004 2:34 am

I need to increment a BCD value. My thoughts were to convert the BCD to a byte add 1 and then convert back to BCD. Does anyone have any code that converts BCD to Byte and back? Thanks Kevin

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Mon Jan 05, 2004 2:54 am

Reply with quote

Quote:

I need to increment a BCD value. My thoughts were to convert
the BCD to a byte add 1 and then convert back to BCD. Does
anyone have any code that converts BCD to Byte and back?

I think you could write code to do it without converting back
and forth to binary, but to answer your question:

There is code in the archives to do this. Do a search for bin2bcd
and you'll find that routine and its mate, bcd2bin.

Ttelmah
Guest

Re: BCD to byte and back

Posted: Mon Jan 05, 2004 5:21 am

Reply with quote

picker wrote:

I need to increment a BCD value. My thoughts were to convert the BCD to a byte add 1 and then convert back to BCD. Does anyone have any code that converts BCD to Byte and back?

Thanks
Kevin

More work than is needed. :-)

int8 BCDval

if ((++BCDval & 0xF)==0xA) BCDval+=5;

A lot less work than performing the two conversions.

Best Wishes

picker

Joined: 07 Sep 2003
Posts: 19
Location: South Africa

BCD to Byte and back
Posted: Mon Jan 05, 2004 6:06 am

Thanks guys...

KerryW
Guest

BCD math
Posted: Mon Jan 05, 2004 9:03 am

int8 BCDval if ((++BCDval & 0xF)==0xA) BCDval+=5; Shouldn't that be if ((++BCDval & 0xF)==0xA) BCDval+=6; ?

Ttelmah
Guest

Re: BCD math

Posted: Mon Jan 05, 2004 4:38 pm

Reply with quote

KerryW wrote:

int8 BCDval

if ((++BCDval & 0xF)==0xA) BCDval+=5;

Shouldn't that be
if ((++BCDval & 0xF)==0xA) BCDval+=6; ?

Yes...
Sorry, a 'mistype'.

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