One Teensy 4.1 out of two cannot be seen on my PC but still loads and functions

C

craigyb

Active member
So I've been working on a project with a couple of Teensy 4.1 devices, one controls the displays (9 of them) and one controls the synth. Yesterday the Teensy 4.1 that controls the displays refused to be seen by Windows 10, just not in the drop down and I get Winowd USB device not recognised occasionally. But the Teensy still loads when I fire Blink at it and press the load button, but its stil not visible in the drop down. I can then load my code in and it functions again if I press the load button the code will load and function. Nothing changed, I finished for the night 2 days ago and the next day this started immediately. I even tried loading the code from the good Teensy into the bad one and the same, it refuses to be seen. I tried the 15 second reset, I tried rebootong my PC, removing devices under Device Manager etc. I'm stuck, I can still load code, but something is not right and unfortunately the Teensy is soldered into place with a PSRAM chip too due to space limitations.
 
Firstly....I'm no expert, but do both Teensy's share the same USB vid/pid? Are they both programmed as the same USB device in the tools menu?

Windows seems to sometimes get confused if you plug two usb devices with the same VID/PID. I haven't explored this extensively, but have seen this with Teensy Midi devices that share the same VID/PID. Maybe someone with more experience could chime in here to confirm.....

P.s I saw your masterpiece on the FB group... Looks great!
 
Last edited:
submo said:
Firstly....I'm no expert, but do both Teensy's share the same USB vid/pid? Are they both programmed as the same USB device in the tools menu?

Windows seems to sometimes get confused if you plug two usb devices with the same VID/PID. I haven't explored this extensively, but have seen this with Teensy Midi devices that share the same VID/PID. Maybe someone with more experience could chime in here to confirm.....

P.s I saw your masterpiece on the FB group... Looks great!
Click to expand...
Cheers, Only thing I can be sure about is that I have been programming both devices for a week or so with the same cable, moving it from one to the other, now I cannot see the display one it's hard to tell you anything else, I can program it, the red light flashes when I press the program button. I can sometimes get it stable to read the VID/PID, I will try to get numbers when I can.
 
I've sort of fixed it, I removed some cheap chinese hubs from my system, added what I think is a working hub, moved that Teensy to the hub and ut seems to work, Don't you just love windows.
 
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