FTDI - Programmer on the edge 2 evaluation board

Nix

Hi guys.
Is it possible to use a standard FTDI UART adapter on the programming header. (Like the one below) with the P2 Evaluation Bread Board?

If I set it on 3.3V, connect VSS -> GND, RES -> DTR, ⏶-> TX and ⏷ -> RX

Rayman

One would think so. Setting for 3.3 v I/o is important. Haven’t heard of anyone getting it to work yet though .
Good luck!

Ariba

If you connect DTR directly to ResN you are always in Reset state if the COM port is closed.

To avoid this you can add a series capacitor between DTR and ResN (~ 1nF) and maybe also invert DTR output with the FTDI tool FT_PROG.
Then it should behave like the PropPlug (with inverted DTR).

Alternatively you can also just connect RTS to ResN and change the settings in PropTool or FlexProp. This has the advantage that there is no Reset if the COM port closes and reopens on Windows.

COM   open  reset                               close
        ____   __________________________________
DTR ___|    |_|                                  |___
__  ___      _                                    ___
DTR    |____| |__________________________________|
     __  _____  _________________________________  __
ResN   |/     |/                                 |/   with Cap + Pullup

    ________   _______________________________________
RTS ___/    |_|                                  
    first
    open

Andy

Nix

@Ariba said:
If you connect DTR directly to ResN you are always in Reset state if the COM port is closed.

It seems to work fine on Linux. Maybe Linux leaves the port open after sending.
Anyway, I've got Catalina payload working... although p2load from p2gcc can't find the P2 even when you give it a port.