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Device Descriptor Request Failed: PIC18LF14k50 (mla 'CDC-serial emulator' example program)

0 votes
Dear all,

I'm having trouble with the CDC-serial emulator example program of MLA (version 2015-08-10).
I programmed it on a PIC18LF14K50, available on an own-made PCB.
Schematics URL:

When I connect the USB connector (after removing the programming connector) to the PC I get the error message that the USB device could not be recognized. Opening the device manager learns that the 'Device Descriptor Request Failed).
Error message:
Device manager:
What can be the problem? The PC runs Windows 8.1 Enterprise.

For another project about 2 years ago I also implemented a serial emulator starting from the MLA example software (don't know anymore which version). At that time it was working and I was using windows 7. But when I try to connect that device, which was working and didn't change any code, to the best spin bikes under $500 current computer with Windows 8.1, it is not working either. So I'm thinking this can be a Windows 8.1 problem, but how to solve it? Or is there another problem? business plan

I already searched online for solutions but none of them have worked so far.

I hope someone can help me out.
asked Jul 12 in USB Serial by mrsiddle New to the Community (2 points)
edited Oct 5 by mrsiddle

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2 Answers

0 votes
Dear all,

I'm having trouble with the CDC-serial emulator example program of MLA (version 2015-08-10).
I programmed it on a PIC18LF14K50, available on an own-made PCB.
Schematics URL:

When I connect the USB connector (after removing the programming connector) to the PC I get the error message that the USB device could not be recognized. Opening the device manager learns that the 'Device Descriptor Request Failed).
Error message:
Device manager:
What can be the problem? The PC runs Windows 8.1 Enterprise.

For another project about 2 years ago I also implemented a serial emulator starting from the MLA example software (don't know anymore which version). At that time it was working and I was using windows 7. But when I try to connect that device, which was working and didn't change any code, to the current computer with Windows 8.1, it is not working either. So I'm thinking this can be a Windows 8.1 problem, but how to solve it? Or is there another problem?
I already searched online for solutions but none of them have worked so far.

I hope someone can help me out.
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answered Nov 1 by mrsiddle New to the Community (2 points)
edited Nov 6 by mrsiddle
0 votes
Dear all,

I'm having trouble with the CDC-serial emulator example program of MLA (version 2015-08-10).
I programmed it on a PIC18LF14K50, available on an own-made PCB.
Schematics URL: https://www.b2bappointmentsetting.com/

When I connect the USB connector (after removing the programming connector) to the PC I get the error message that the USB device could not be recognized. Opening the device manager learns that the 'Device Descriptor Request Failed).
Error message:
Device manager:
What can be the problem? The PC runs Windows 8.1 Enterprise.

For another project about 2 years ago I also implemented a serial emulator starting from the MLA example software (don't know anymore which version). At that time it was working and I was using windows 7. But when I try to connect that device, which was working and didn't change any code, to the current computer with Windows 8.1, it is not working either. So I'm thinking this can be a Windows 8.1 problem, but how to solve it? Or is there another problem?
I already searched online for solutions but none of them have worked so far.
techwiff
I hope someone can help me out.
reposted
answered Nov 11 by mrsiddle New to the Community (2 points)
edited 6 days ago by mrsiddle
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