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Serial with Flow Control? — Parallax Forums

Serial with Flow Control?

RaymanRayman Posts: 14,967
in Propeller 2

Maybe this is trivial, but seems Vinculum interface is wanting RTS and CTS signals (until can figure out how to override that...)

Do we already have a driver that has this?

Comments

  • evanhevanh Posts: 16,243
    edited 2025-02-13 21:20

    I've not looked hard but I doubt it.

    I wouldn't even know how tight the control timings required to be. Presumably the handshaking actions on word boundaries rather than bit boundaries. To be fully compliant at the Prop2 end would probably need to avoid using the smartpin's 1-deep tx hardware buffer.

  • RaymanRayman Posts: 14,967
    edited 2025-02-13 22:01

    Ok, heard back from FTDI and guess it's a non-issue...
    Seems one can "tie RTS & CTS together, or just drive CTS low."

  • evanhevanh Posts: 16,243
    edited 2025-02-13 22:19

    Oh, ha, yeah, if you are just trying to bypass it, sure, tie CTS to RTS or DTR. It was pretty common, back in the day, to loop DTR back to DSR, and RTS back to CTS at the respective ends of the cable. Then just have TXD, RXD, and GND in the cable.

  • Wuerfel_21Wuerfel_21 Posts: 5,234

    I don't think the flow control timing is strongly defined. There should definitely be some slack, i.e. drop the signal when you still have a little bit of buffer left to catch any last byte that may trickle out.

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