Re: [Flashforth-devel] strange answer from UART

[Thomas B. <bus...@gm...>]

Dear Peter, is HSPLL actually for crytals and resonators? I use a
oszillator (clock) see link in the first mail. But of course this evening
I'll give it a try.
Thomas


2014-03-17 11:54 GMT+01:00 Peter Jacobs <pe...@me...>:

> Can you simply turn on the PLL (OSC = HSPLL) to get a 16MHz sys-clock
> frequency?  I've quite happily run a PIC18F2520 at 38400 baud with a
> 4MHz crystal and the PLL active.
> Peter J.
>
>
> On 17/03/14 18:33, Herman Attila wrote:
> > Hi Thomas,
> >
> > Maybe your problem comes from low Osc-frequency/baudrate ratio. Using
> 4MHz osc freq. the controller generates the 38400kbs with 10% error. Try to
> use higher osc freq. or lower baudrate. Otherwise I recommend you to use
> 18F26K22 or other xxk22 controllers. They have well configurable internal
> oscillator and have several further excellent features.
> >
> > BR
> > Attila
> >
> > ----- Eredeti üzenet -----
> > Feladó: Thomas Buschhardt <bus...@gm...>
> > Dátum: Hétfő, Március 17, 2014 8:32
> > Tárgy: [Flashforth-devel] strange answer from UART
> > Címzett: Fla...@li...
> >
> >
> >> Dear Mikael and mailing listeners,
> >>
> >> I desperated, I got some strange signs back from the PIC. In my
> >> despair - I
> >> installed even MS Windows, to see whether my usb-2-serial adapter is
> broken
> >> - but the program "Hyperterminal" shows the same results.
> >>
> >> Here is my configuration:
> >>
> >> PIC18F2620
> >> 4 MHz Oscillator Link to
> >> Oszillator<>
> >> MAX232
> >> FD-USB2Serial-Adapter
> >>
> >> The programing - process runs well with my PICKIT2. When the PIC gets
> >> power
> >> its send the same strange signs, and if I blind input "1 2 3" (to the
> >> stack) in the terminal, I got a answer - that could be the right one.
> >> --snip--
> >> 38400 -  8 - N - 1
> >> ¦¬¡³¸¦¯²´¨ •Ž° °©£±˜ Š Š‘
> >> ¦¬¡³¸¦¯²´¨ •Ž° °©£±˜ Š Š‘
> >> ¦¬¡³¨¦¯²´¸ •Ž° °©£‘¸ Š Š‘
> >> ± ² ³ ± ² ³ Ÿ Š
> >> --snip--
> >> Here I restart 3 times the PIC and input "1 2 3" and get back "± ² ³ Ÿ
> >> Š".
> >>
> >> I changed the baudrate, oszillator frequency, the oscillator selection
> >> bits
> >> - without success.
> >> I hope I do some configuration mistakes, so please help me.
> >>
> >> The schematics for my hw-configuration, the (binary) log-file of the
> >> terminal and my changed configurations-files you can find here as zip
> >> file.
> >>
> >>
> >>
> >>
> >> If you need more informations, please drop me a mail.
> >>
> >> Greetings Thomas
> >>
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