[Amforth] AVR online baudrate calculator

[pito <pi...@vo...>]

FYI - AVR baud calculator

http://www.wormfood.net/avrbaudcalc.php?postbitrate=9600&postclock=11.0592


----- PŮVODNÍ ZPRÁVA -----
Od: "Matthias Trute" <mt...@we...>
Komu: "Everything around amforth"
<amf...@li...>
Předmět: Re: [Amforth] Issues with a word compile - flash or eeprom
Datum: 7.5.2012 - 21:14:08

> Hi Jan,
> 
> > Chuck,
> > 
> > When I won't to run at a higher baud rate should
> > I compile again?
> > 
> That would probably be the easiest way.
> 
> Technically it is not needed however. The serial
> settings come from the VALUE baud (check with e.g.
> 
> \ I use 38400 instead of 9600
> amforth 4.9 ATmega1284P 16000 kHz
> > baud u.
> 25  ok
> >
> ). The initial value is calculated at compile time
> but nothing prevents you from changing it at
> runtime.
> 
> The two bytes from this value are written
> literally
> into the baudrate registers at startup (e.g.
> COLD),
> thus the name of the value "BAUD" is somewhat
> misleading. The datasheets have a rather big table
> for some cpu frequencies and baud rates. The
> compile
> time calculation is done in the file
> core/amforth-eeprom.inc An untested forth snippet
> is
> in lib/misc.frt
> 
> The steps are
> 1) get the new settings (e.g. from datasheet)
> 2) store them into BAUD
> 3) reset the controller (COLD)
> 4) reconfigure your terminal
> 
> If you write to the baud rate registers directly
> (its
> not rocket science, after all), you can even
> change
> the settings on the fly. You should use one
> command line
> for both bytes however with the order high-byte
> low-byte (again: datasheet).
> 
> Matthias
> PS: Is there someone who wants to implement
> auto-baud?
> 
> ------------------------------------------------------------------------------
> > Live Security Virtual Conference
> Exclusive live event will cover all the ways
> today's security and 
> threat landscape has changed and how IT managers
> can respond. Discussions 
> will include endpoint security, mobile security
> and the latest in malware 
> threats.
> http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Amforth-devel mailing list for
> http://amforth.sf.net/
> Amf...@li...
> https://lists.sourceforge.net/lists/listinfo/amforth-devel
>