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Mbed programming over the network with Conceptrontic CHDDLANU file/printerserver not possible?

Topic last updated 26 Jul 2011, by Jasper Sikken. 2 replies
Jasper Sikken
19 Jun 2011

Hi, my mbed is located in the closet where all my electricity/water/gas meter is. I want to program the mbed from a computer in the network, rather than going to the closet connecting the usb cable to the laptop and do the programming on the floor. Therefore I bought the Conceptronic CHDDLANU file/printerserver. That makes it possible to connect a USB printer or mass storage device the network. However somehow the mbed does show up like a mass storage device, as I expected. Does anyone have a suggestion why the mbed does not show up as a mass storage device?

Ad van der Weiden
19 Jun 2011

probably because the conceptronic doesn't recognise it as such. With USBView you can check the device descriptors

This is how an mbed looks (class=2)

Device Descriptor:
bcdUSB:             0x0110
bDeviceClass:         0x02
bDeviceSubClass:      0x00
bDeviceProtocol:      0x00
bMaxPacketSize0:      0x40 (64)
idVendor:           0x0D28
idProduct:          0x0204
bcdDevice:          0x0100
iManufacturer:        0x01
iProduct:             0x02
iSerialNumber:        0x03
bNumConfigurations:   0x01

ConnectionStatus: DeviceConnected
Current Config Value: 0x01
Device Bus Speed:     Full
Device Address:       0x02
Open Pipes:              5

Endpoint Descriptor:
bEndpointAddress:     0x82  IN
Transfer Type:        Bulk
wMaxPacketSize:     0x0040 (64)
bInterval:            0x00

Endpoint Descriptor:
bEndpointAddress:     0x02  OUT
Transfer Type:        Bulk
wMaxPacketSize:     0x0040 (64)
bInterval:            0x00

Endpoint Descriptor:
bEndpointAddress:     0x81  IN
Transfer Type:   Interrupt
wMaxPacketSize:     0x0040 (64)
bInterval:            0x10

Endpoint Descriptor:
bEndpointAddress:     0x85  IN
Transfer Type:        Bulk
wMaxPacketSize:     0x0040 (64)
bInterval:            0x00

Endpoint Descriptor:
bEndpointAddress:     0x05  OUT
Transfer Type:        Bulk
wMaxPacketSize:     0x0040 (64)
bInterval:            0x00

and this is how a USB stick looks (class=0)

Device Descriptor:
bcdUSB:             0x0200
bDeviceClass:         0x00
bDeviceSubClass:      0x00
bDeviceProtocol:      0x00
bMaxPacketSize0:      0x40 (64)
idVendor:           0x090C (Feiya Technology Corporation)
idProduct:          0x1000
bcdDevice:          0x1100
iManufacturer:        0x01
iProduct:             0x02
iSerialNumber:        0x03
bNumConfigurations:   0x01

ConnectionStatus: DeviceConnected
Current Config Value: 0x01
Device Bus Speed:     High
Device Address:       0x03
Open Pipes:              2

Endpoint Descriptor:
bEndpointAddress:     0x81  IN
Transfer Type:        Bulk
wMaxPacketSize:     0x0200 (512)
bInterval:            0xFF

Endpoint Descriptor:
bEndpointAddress:     0x02  OUT
Transfer Type:        Bulk
wMaxPacketSize:     0x0200 (512)
bInterval:            0xFF

class 2 means CDC class (communications class), the mass storage class is 8 but I tried 3 different sticks and they all report 0 (meaning that the class is obtained from the interface descriptors).

Jasper Sikken
26 Jul 2011

Thanks for your explanation, AD. This probably means that I cannot see the mbed as a mass storage device using my my Conceptrontic CHDDLANU file/printerserver.