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Win7 64-bit com port not resetting ? — Parallax Forums

Win7 64-bit com port not resetting ?

tjcliffordtjclifford Posts: 4
edited 2010-12-25 08:39 in Propeller 1
Good day.
I"ve searched the forum to find a similar post, but could not find any, so I apologize if a similar post
exists.

I'm running a propeller education kit, using Win7 Pro 64-bit, and have the FTDI driver 2.8.2.0 (7/12/2010)
64-bit presumably. The com port (13) chosen by the system appears to work, but only once, and will not
reset. I have to unplug and re-plug the usb cable to reset the port every time I use it.
The port settings are 9600/8/n/1, no flow control.

Has anyone else seen this behavior for the usb connection ?

Thanks....
Tom C.

Comments

  • lonesocklonesock Posts: 917
    edited 2010-12-24 16:16
    I had the same problem. Here's what worked for me...under the Advanced Settings for the port, I set:

    Latency Timer = 8ms
    Serial Enumerator = unchecked
    Disable Modem Ctrl as Startup = checked

    I think only the 1st one mattered. I also noticed the problem was worse when the USB2.0 speed was set to fast (480MBps), better when set to hi (12MBps), and almost gone, but not completely, when disabling USB 2.0 completely. Also, the problem existed for 2 earlier revisions of the FTDI driver. This was on an Ion motherboard.

    Jonathan
  • Mike GMike G Posts: 2,702
    edited 2010-12-24 17:03
    When you say use the port, do you mean load a programming into the Propeller, using the Parallax Serial Terminal, or maybe something else? Did you write any custom code to grab serial data? I've seen folks use even drive code in Windows but forget to handle threading properly.
  • tjcliffordtjclifford Posts: 4
    edited 2010-12-24 19:07
    Thanks for all the suggestions.
    I finally figured it out when I loaded a program into ram, and a message popped up that
    com13 could not be reset, and that 'hotsync manager' would try to reset the port.

    I turned off my Palm Hotsync Manager, and the port was free to be used again. No
    reset message, I can load as many programs consecutively without having to unplug
    the usb cable.
    My bluetooth connector for the pc is on usb too, and my keyboard, and mouse.
    No wonder it was messing up.

    Thanks to everyone.
  • StefanL38StefanL38 Posts: 2,292
    edited 2010-12-25 05:23
    Hi,

    Good it is working now for you.

    I have
    two USB harddiscs,
    a USB DVD-burner,
    a scanner,
    a usb-to-parallalport-converter,
    a PS/2-keyboard to USB converter,
    a wiresless mouse-receiver
    and a propeller-chip
    all connected via USB to my DELL 1721 Inspiron Notebook running Windows 7 32bit ultmate and can connect to my propeller without any problems.

    They are all connected through a 13 port-USB hub from http://www.sednacomputer.com/

    I don't think it is a "too much devices on USB-problem". USB is designed for hooking up a lot of device
    best regards

    Stefan
  • LeonLeon Posts: 7,620
    edited 2010-12-25 05:42
    I had a similar problem with the Palm Hotsync Manager on my desktop PC, running Windows XP. I had to disable it every time I wanted to use the Prop Plug.
  • mynet43mynet43 Posts: 644
    edited 2010-12-25 08:39
    I just started having the same problem with XP. I can connect to the board using a PC application, and it works fine.

    When I try to connect to it using a USB port from the Prop Tool, it work the first time after connecting with the PC app. After this, the Prop Tool can't find the port.

    Besides this board, all I have connected to USB is a Keyboard and Mouse.

    Any ideas on how to get around this?

    Thank you for the help.

    Jim
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