USB Error

General discussion and support for the Peaberry SDR V2.

USB Error

Postby therrick » Sun Jun 02, 2013 3:04 pm

I just finished the point of the USB chip installed. I have installed the newer SoftRock lib drivers using a SoftRock unit but hen I connect the Peaberry I continually come up with the error for the USB device. The Lib-usb doesn't start either.

I have checked the chips for shorts both with a magnifying glass and even removed it, hot air, and reinstalled. The status LED is solid on.

Any ideas from anyone?

Tim, KQ8M
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Re: USB Error

Postby hansvi » Sun Jun 02, 2013 5:50 pm

If the device shows up when you plug it in, it has been enumerated. Enumeration requires communication (it's part of the USB 'handshake', communicating the name of the device, the endpoints etc.). So if you can see a device appear after you plug it in (using the device manager), then the hardware is most probably O.K., and it is a software problem.
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Re: USB Error

Postby therrick » Sun Jun 02, 2013 6:33 pm

That's just it, It doesn't show up. I get an unrecognized USB device error from windows when I plug it in.
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Re: USB Error

Postby hansvi » Sun Jun 02, 2013 8:07 pm

I did some googling, and this error does not necessarily mean that enumeration has failed.

E.g. see this link:

http://msdn.microsoft.com/en-us/library/windows/hardware/jj151572(v=vs.85).aspx

Now, perhaps installing a USB sniffer is a bit steep at the moment, but the article does mention how you can determine if enumeration has succeeded. (start the device manager and take a look at the unknown device).

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Re: USB Error

Postby therrick » Mon Jun 03, 2013 1:37 am

There is no unknown device.
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Re: USB Error

Postby AE9RB » Mon Jun 03, 2013 3:16 am

Did you install U4 backwards? Are all four resistors correct and soldered well? Does the 13.8V current increase when you plug in the USB cable? Did you try another USB cable? Another computer? Perhaps the USB jack has a solder bridge.
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Re: USB Error

Postby therrick » Mon Jun 03, 2013 1:11 pm

AE9RB wrote:Did you install U4 backwards? Are all four resistors correct and soldered well? Does the 13.8V current increase when you plug in the USB cable? Did you try another USB cable? Another computer? Perhaps the USB jack has a solder bridge.


No, U4 is installed correctly. Yes all four resistors are correct, soldered well and no solder bridges. The 13.8v current goes from 126.5mA to 172.3mA with the USB plugged in. Yes, tried another cable on another computer. No solder bridge on the USB plug.
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Re: USB Error

Postby AE9RB » Mon Jun 03, 2013 4:56 pm

Test that pins 2-3 of the USB jack are connected to pins 34-35 of the PSoC with 22 ohms of resistance. Make sure they aren't shorted against each other or to another USB pin. You can also test with U4 removed since it's only TVS diodes.
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Re: USB Error

Postby therrick » Mon Jun 03, 2013 6:48 pm

AE9RB wrote:Test that pins 2-3 of the USB jack are connected to pins 34-35 of the PSoC with 22 ohms of resistance. Make sure they aren't shorted against each other or to another USB pin. You can also test with U4 removed since it's only TVS diodes.


Thank you Dave.

Therein lied the problem. Pin 35 was not soldered totally and presented a high resistance. After re-soldering that pin the device came to life. Thank you for your time.
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