Cursor goes crazy

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pelissima

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Lenovo Thinkpad T61 on board connected to Garmin via usb and opto isolator running OpenCPM, usually working fine. However, on occasion -and of course it always chooses the worst one- the cursor goes crazy appearing in many places simultaneously and making the laptop use impossible. Hardware shutdown and removal of usb restore things. Any ideas on how to corner the cause?
 
Yep, the pc 'sees' the GPS input as the mouse.

There is a command line 'noserialmouse' or similar that you can put into it - sure someone will come along and tell you how and where because I can't remember.

Other option is to ensure the pc is up and running before turning the GPS on.

W.
 
The computer thinks the usb device is a mouse and the nmea data causes the random cursor. Try booting up the computer with the usb device disconnected. Once the computer has finished booting up plug in the usb.

Hope it helps...
 
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I get the same with my Samsung in very similar set up, seems that the serial to USB adaptor gets mistaken for a mouse which is why it affects me when any programme is running. Other phenomenon I get with Open CPM only is the "blue screen of death" which strikes randomly after an hour or so. This latter I believe is a problem with the driver for the serial to USB adaptor which I have been unable to fix. No solution for you I fear but more info for an expert to advise?

Edit: Ah ha, perhaps you are not using a serial to USB adaptor? In which case ignore this post.
 
As said this is Windows 'recognising' your GPS device as a serial mouse, the data strings are apparently similar enough to confuse. I'll try to find a link to the procedure that actually works reliably, most dont, to prevent this - its something to do with enumeration of serial port inputs (even if the data is actually coming in through a serial/USB convertor) but you still need to boot Windows with the device disconnected.

EDIT:
This link isnt the one I had in mind but should work - this may work for XP only though. In searching for this it seems there is no consistent fix across all versions of Windows. This is much more what I remember doing on the current machine, XP, several years ago now - provided I remember to disonnect/turn off the GPS input when XP is booted all is fine.
 
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gnatsis said:
Lenovo Thinkpad T61 on board connected to Garmin via usb and opto isolator running OpenCPM, usually working fine. However, on occasion -and of course it always chooses the worst one- the cursor goes crazy appearing in many places simultaneously and making the laptop use impossible. Hardware shutdown and removal of usb restore things. Any ideas on how to corner the cause?
Click to expand...

its a conflict with the OS
i had the same problem, lappi running XP all fine. i then formatted & loaded W7
& had your problem.
i bought a £20 maplin GPS dongle & problem solved.
your antenna is not compatible with your OS
 
sailorman said:
its a conflict with the OS
i had the same problem, lappi running XP all fine. i then formatted & loaded W7
& had your problem.
i bought a £20 maplin GPS dongle & problem solved.
your antenna is not compatible with your OS
Click to expand...

Perfect, that's the way to go.
GPS redundancy too at 20 £.
Thank you
 
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