Exception: mvncStatus.ERROR

idata · ‎06-19-2018

Hi

I'm running two ncs in raspberry pie.

Until one hour ago I was testing 2 ncs well.

But the second ncs just before is not open.

What causes it?

Traceback (most recent call last):

File "image-classifier.py", line 171, in

main()

File "image-classifier.py", line 118, in main

device = open_ncs_device()

File "image-classifier.py", line 38, in open_ncs_device

device.OpenDevice()

File "/usr/local/lib/python3.5/dist-packages/mvnc/mvncapi.py", line 147, in OpenDevice

raise Exception(Status(status))

Exception: mvncStatus.ERROR

Two devices are displayed.

Look for enumerated NCS device(s); quit program if none found.

devices = mvnc.EnumerateDevices()
if len( devices ) == 0:
    print( "No devices found" )
    quit()
print(str(len(devices)))

result = 2

This is lsusb -t result

/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M

|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M

|__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M

|__ Port 2: Dev 4, If 0, Class=Hub, Driver=hub/4p, 480M

|__ Port 3: Dev 10, If 0, Class=Vendor Specific Class, Driver=, 480M

|__ Port 4: Dev 23, If 0, Class=Vendor Specific Class, Driver=, 480M

|__ Port 3: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 12M

|__ Port 3: Dev 5, If 1, Class=Human Interface Device, Driver=usbhid, 12M

|__ Port 3: Dev 5, If 2, Class=Human Interface Device, Driver=usbhid, 12M

|__ Port 4: Dev 7, If 1, Class=Video, Driver=uvcvideo, 480M

|__ Port 4: Dev 7, If 2, Class=Audio, Driver=snd-usb-audio, 480M

|__ Port 4: Dev 7, If 0, Class=Video, Driver=uvcvideo, 480M

|__ Port 4: Dev 7, If 3, Class=Audio, Driver=snd-usb-audio, 480M

lcs linked ust hub.

I need your help thank you.

idata · ‎06-19-2018

The same symptom occurred when rebooting.

But after about 1 hour, I tried again and it was working normally.

I do not know what the cause is……

idata · ‎06-21-2018

@sulki.kim Please make sure you are using a powered USB hub when using multiple NCS devices on the Raspberry Pi. Give this a try and let me know if it solves your issue. Thanks.