Re: [Flashforth-devel] strange answer from UART

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

Hallo Peter,

in the figure 2-7 of the datasheet
http://ww1.microchip.com/downloads/en/DeviceDoc/39626b.pdf both osc-pins
are connected.

Cheers big ears
Thomas



2014-03-17 13:03 GMT+01:00 Peter Jacobs <pe...@me...>:

>  Thomas,
> Looking at sections 2.x in the datasheet, it seems to me that the PLL is
> not exclusively for crystals and resonators; it available to the 4 and 8MHz
> internal oscillator.  Figure 2.8 shows it limited to these options.  That
> figure is (presumably) a simplified diagram and I don't know enough to be
> sure what would happen if you set OSC=HSPLL and drive the OSC1 pin with
> your external oscillator.  Would you be abusing the silicon?  You wouldn't
> be able to use RA6 as an IO pin but that might be OK since you don't show
> it in use on your diagram.
> Peter J.
>
>
>
> On 17/03/14 21:25, Thomas Buschhardt wrote:
>
> 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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