Interesting. So I have some data now for TPDD transfer @76800, 38400 and 19200. 32kb transfer from PC to M100 (actually writing to ram sequentially) 76800 == 9 sec 38400 == 14 sec 19200 == 23 sec
strange though, I have my 56800 result @ 7 sec. weird. Unless my code is very inefficient, it seems that TPDD protocol overhead really slows things down, because TBACK was able to do the same at 6.6 sec. Maybe TBACK is the right way to go here, and abandon TPDD protocol for large transfers.. On Sun, Apr 26, 2020 at 2:29 PM John R. Hogerhuis <jho...@pobox.com> wrote: > I did not have to do anything special to get the FTDI to support 76800. No > special driver or tweaks. > > TBACK just opens the port with the rate set to 76800. That's all. > > Yes tback supports loading the backed up image. > > It still polls the port directly but uses hardware flow control to keep > from being overrun. > > I expect it is slower because of flow control. > > -- John. >
