Re: [Flashforth-devel] UART delay for TeraTerm, CoolTerm

[om1zz <om...@vo...>]

Hi Attila,

I've done following experiment (dspic33fj128gp802):

1. rx buffer = 127, tx buffer = 15
2. Fcy 16.588MHz (internal oscillator and PLL)
3. baud 921k600 8N1, zero transmit delays, no flow control
4. CA-42 clone usb serial
4.  I did 8 uploads of float.txt, once it stops here:

: emitnzeros ( n -- )
 8 constant precision exponent?precision ??

otherwise it uploads fine, in 14 seconds:

finit  ok<#,ram>
Fcy  ok<#,ram> 16588
-3.23248e-10 fe. -323.24807E-12  ok<#,ram> 16588

Still the dspic33 is a bit faster as it is a 16bitter.

Igor.

>Hi Attila,
>I think it could be because the 18F is slow to process the incoming data, somehow.
>Its speed is 16MHz and it is an 8bitter.
>Also double check the size of rx/tx buffers, I use 511 for both (if that fits into the ram, of course).
>Igor.
>
>>
>>Hello Igor,
>>
>>I have tried your TT macro with 18F26K22@64MHz, 38400bps, FT230X, Win7.
>>Unfortunately it was not efficient to get rid of the delays.
>>Have you any idea why this is?
>>
>>BR
>>Attila Herman
>l
>>
>