Re: DCF 77 clock

[Ignatios Souvatzis <is%jocelyn.rhein.de@localhost>]

On Wed, Mar 31, 1999 at 02:10:42PM +0200, Michael Boehnisch wrote:
> >- set the port to 110 bps
> >- depending on wether the bit is short or long, you'll get two different
> >ASCII characters.
> 
> Somehow this makes me shudder... Sampling a low frequency signal using
> the RS232 serial protocol - this should actually work but leaves the
> feeling of an evil hack --- a nice one, though :-)

you dont _sample_ it!

the falling edge (you need an inverter) of the pulse _starts_ reading of an
asynchronous character.

It will be either 0x7f or 0x3f, I think. Maybe either 0x3f or 0x1f. Or, in
case the low bit is sent first, 0x7f/7e or 0x7e/7c. You get the idea.

        -is