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

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

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
> 
> 
> 
> 
> 
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-- 
--
Mikael