Re: [Flashforth-devel] strange answer from UART

[Mikael N. <mik...@pp...>]

Hello !
With the 4 MHz external clock the following should work:

HSPLL , 9600 ,  constant clock=d'16000000'
HSPLL , 38400 ,  constant clock=d'16000000'


FlashForth always configures the internal clock to run at 8 MHz.
With the internal oscillator the following should work.
INTIO67 , 9600, constant clock=d'8000000'

The INTIO67 with PLL requires that the PLL is enabled in software.
There is a define missing in the processor configuration file for that.

The INTIO67 with PLL requires that you define in p18f2525-2620-4525-4620.cfg
;;; Activate 4xPLL from SW for INTOSC modes in FlashForth 5.0
#define PLL ENABLE             ; ENABLE or DISABLE

and then these should also work

INTIO67 , 9600 , constant clock=d'32000000'
INTIO67 , 38400 , constant clock=d'32000000'

BR Mike

On 03/17/2014 06:14 PM, Thomas Buschhardt wrote:
> Hallo now I was able to run it :-)
>
> Here are my tested configs
> OSC - Baud = Status
> -----------------------------------
> ECIO6 - 9600 = working
> ECIO6 - 14400 = not working
> ECIO6 - 38400 = not working
> INTIO7 - 9600 = not working (without oszi)
> INTIO67 - 9600 = not working (without oszi)
> HSPLL - 9600 = not working
> HSPLL - 38400 = not working
>
> Thank you all very much
> Thomas
>
>
> 2014-03-17 13:03 GMT+01:00 Peter Jacobs <pe...@me... 
> <mailto: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.
>