Re: [Flashforth-devel] USB-UART bridge puzzle

[Tristan W. <ho...@tj...>]

Hello Mikael,

Thank you. I tried adding pause to the bridge word but to no
avail. Still no data received if the serial data is sent
infrequently. No data received after a good long wait. I have just
moved my winter project to the PIC18F25K50 (to get more flash storage)
from the PIC18F14K50. I didn't recall anything similar happening with
that chip, so I tried the bridge back on my PIC18F14K50 setup and - it
worked (without pause). It would seem to me that the two chips are
responding differently to what I think is the same code. A puzzle. 

Best wishes,
Tristan


On 20Nov21 06:23, Mikael Nordman wrote:
> Hi,
> 
> TXU collects up to 8 characters before it sends the buffer to the
> USB line.
> 
> There is a timeout 2+TICK_TIME milliseconds to send the buffer if no
> data arrives to TXU. TICK_TIME is defined in the config file.
> 
> That timeout is handled by PAUSE.
> 
> So you should have seen data on the USB line after 8 seconds.
> If not then there is some other problem.
> 
> Try this
> 
> : bridge
>     u1-
>     begin
>         pause rx1? if rx1 txu then
>     again
> ;
> 
> BR Mikael
> 
> 
> On 2021-11-19 21:09, Tristan Williams wrote:
> > Hello,
> > 
> > I have a small mcu, sending serial data over its hardware uart
> > (38400-8N1) to the RX1 port of a PIC18F25K50 running FlashForth over
> > USB. I am trying to see/capture that serial data using FlashForth as a
> > USB-UART bridge
> > 
> > : bridge
> >     u1-
> >     begin
> >         rx1? if rx1 txu then
> >     again
> > ;
> > 
> > as per https://sourceforge.net/p/flashforth/wiki/USB-UART%20bridge/
> > 
> > If the serial data is sent as a continuous stream then it arrives as I
> > expect. If the data is subject to a delay in transmission - i.e. I put
> > a 1 second delay between each data byte, the data does not arrive. It
> > seems, perhaps, that the bridge has stalled in some way whilst waiting?
> > 
> > I hooked up a second usb-serial adaptor (FTDI) to the small mcu TX and
> > the delayed data is definitely there, arriving with a one second delay
> > between each data byte. If the data is streamed continuously, both the
> > bridge and the FTDI see it; if I introduce a delay, only the FTDI sees
> > it.
> > 
> > Any light on what I might be doing wrong would be very gratefully
> > received.
> > 
> > Best wishes,
> > 
> > Tristan
> > 
> > 
> > 
> > 
> > 
> > _______________________________________________
> > Flashforth-devel mailing list
> > Fla...@li...
> > https://lists.sourceforge.net/lists/listinfo/flashforth-devel
> 
> -- 
> --
> Mikael
> 
> 
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