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xyphro / UsbGpib

Versatile, cheap and portable USB to GPIB converter (USBTMC class based)
MIT License
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Device descriptor request failed #10

Closed wangwei357 closed 1 year ago

wangwei357 commented 3 years ago

hi, I had used your BootLoader.hex to program the microchip. but when i reconnect my computer . there is no disk show in my PC. and the Device Manager will display “ Unknown USB device （Device descriptor request failed）” ,What possible causes ？ image

xyphro commented 3 years ago

Hi Wanwei,

Did you program the fuses also as described in the readme.md? This would cause exactly this issue.

Let me know, curious what the cause is.

Best regards,

Kai

wangwei357 @.***> schrieb am Sa., 31. Juli 2021, 15:55:

hi, I had used your BootLoader.hex to program the microchip. but when i reconnect my computer . there is no disk show in my PC. and the Device Manager will display “ Unknown USB device （Device descriptor request failed）” ,What possible causes ？ [image: image] https://user-images.githubusercontent.com/77340375/127742083-d7ecddcd-6d84-4fdf-9309-8f547872fec5.png

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wangwei357 commented 3 years ago

Hi Wanwei,

Did you program the fuses also as described in the readme.md? This would cause exactly this issue.

Let me know, curious what the cause is.

Best regards,

Kai

wangwei357 @.***> schrieb am Sa., 31. Juli 2021, 15:55:

hi, I had used your BootLoader.hex to program the microchip. but when i reconnect my computer . there is no disk show in my PC. and the Device Manager will display “ Unknown USB device （Device descriptor request failed）” ,What possible causes ？ [image: image] https://user-images.githubusercontent.com/77340375/127742083-d7ecddcd-6d84-4fdf-9309-8f547872fec5.png

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/xyphro/UsbGpib/issues/10, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABFXEGFFQDHAR6Q3XX4FZ3TT2P6FXANCNFSM5BKBO6OQ .

@xyphro hi
It's my fault. it may cause when program the the fuses without usb connected.
But i had another issue . when there are multipile gpib driver in gpib network . There is only one driver can discover. It's OK for current fwamework?

xyphro commented 1 year ago

The framework is made to just support a single device. I think physically it would be possible to drive multiple GPIB instruments, but the software was made with the intention to just support a single one.