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

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

Tristan,
I have set up the same configuration as yours,
where I send single characters to the UART and have the bridge to USB.

I must have PAUSE in the loop to reset the watchdog.
Otherwise the chip will reset and restart FF.
Maybe you do not have the watchdog active ?

In my setup on the 25k50 the transfer of single characters from
the UART to USB works just fine. This is with the current code
in git/sf.

-bridge
marker -bridge
: bridge ( -- )
   u1-
   begin
     pause
     rx1? if rx1 txu then
   again
;

BR Mikael

On 2021-11-20 09:59, Tristan Williams wrote:
> 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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>> 
> 
> 
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-- 
--
Mikael