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No Propeller 1 found on any serial port — Parallax Forums

No Propeller 1 found on any serial port

cavelambcavelamb Posts: 724
edited 2025-03-29 17:46 in PASM/Spin (P1)

Just started happening recently.

First time access a P1 is okay.
Can detect hardware or load ram just fine.
Once.

But second time - No propeller found.

Unplug and reconnect -
It's Baa-ack...

What's that about?

Comments

  • JonnyMacJonnyMac Posts: 9,269

    Is there a program running on your P1 that is interfering with the download process. If you have a reset button on your P1 board, press it and release just before as you click to download.

  • cavelambcavelamb Posts: 724

    Yes, there is a program running from ROM.

    But pressing the reset button just before clicking on the menu item
    didn't do anything different. (Quickstart)

    Still have to cycle the USB cable

  • cavelambcavelamb Posts: 724
    edited 2025-03-29 21:03

    Checking preferences -

    Propeller reset signal is supposed o be DTR & RTS?

    It is working correctly that way at least.

  • JonnyMacJonnyMac Posts: 9,269

    Standard Propeller Plug and board designs use DTR as the reset signal for the Propeller. I found the QuickStart schematic on my computer and verified this.

  • cavelambcavelamb Posts: 724

    Thanks, Jon.

    When I checked it (finally) Prop Tool was set DTR only.
    Set for DTR/RTS made Prop Tool work.

    I just now changed the USB cable and Reset back to DTR.
    All good.

    Bad Cable?

  • RaymanRayman Posts: 15,112

    I’ve had bad cables in the distant past where things like this would happen.
    Mostly the retractable kind.

    These days get bad iPhone cables all the time.

    Think usb-c is way to go. Think need p1 board with that. Have not seen that fail yet. But also new, so who knows …

  • RossHRossH Posts: 5,573

    @Rayman said:
    I’ve had bad cables in the distant past where things like this would happen.
    Mostly the retractable kind.

    These days get bad iPhone cables all the time.

    Think usb-c is way to go. Think need p1 board with that. Have not seen that fail yet. But also new, so who knows …

    Yes, I have also had problems with the retractable cables. I stopped using them for anything a while ago.

    Another problem is that there are two common types of USB mini and micro cables - charging cables and data cables. Charging cables are mainly intended for charging devices and may not have all the pins wired up - some will also work as data cables and some won't. I have not seen this problem with USB C cables. USB C is also more robust, and you can't plug them in the wrong way - the number of USB ports on expensive devices I have seen ruined by having the cables forced in the wrong way would make you weep.

    Really, no-one should be manufacturing new products with anything except USB C.

  • Wuerfel_21Wuerfel_21 Posts: 5,316

    @RossH said:
    Another problem is that there are two common types of USB mini and micro cables - charging cables and data cables. Charging cables are mainly intended for charging devices and may not have all the pins wired up - some will also work as data cables and some won't. I have not seen this problem with USB C cables.

    Don't worry, charge-only USB C cables exist just as well. Gotta save 5 cents on those 2 strands of copper.

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