The nRF52 devkit has 2 SEGGER instances

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    • The nRF52 devkit has 2 SEGGER instances

      Hello,

      We use the Nordic nRF52 devkit (52832) for our purpose. However it identifies itself (often, not always) after power on as:

      Bus 001 Device 004: ID 1366:0101 SEGGER J-Link PLUS
      Device Descriptor:
      bLength 18
      bDescriptorType 1
      bcdUSB 2.00
      bDeviceClass 0
      bDeviceSubClass 0
      bDeviceProtocol 0
      bMaxPacketSize0 64
      idVendor 0x1366 SEGGER
      idProduct 0x0101 J-Link PLUS
      bcdDevice 1.00
      iManufacturer 1 SEGGER
      iProduct 2 J-Link
      iSerial 3 000682979319
      bNumConfigurations 1
      Configuration Descriptor:
      bLength 9
      bDescriptorType 2
      wTotalLength 0x0020
      bNumInterfaces 1
      bConfigurationValue 1
      iConfiguration 4
      bmAttributes 0x80
      (Bus Powered)
      MaxPower 100mA
      Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 0
      bAlternateSetting 0
      bNumEndpoints 2
      bInterfaceClass 255 Vendor Specific Class
      bInterfaceSubClass 255 Vendor Specific Subclass
      bInterfaceProtocol 255 Vendor Specific Protocol
      iInterface 5
      Endpoint Descriptor:
      bLength 7
      bDescriptorType 5
      bEndpointAddress 0x81 EP 1 IN
      bmAttributes 2
      Transfer Type Bulk
      Synch Type None
      Usage Type Data
      wMaxPacketSize 0x0200 1x 512 bytes
      bInterval 1
      Endpoint Descriptor:
      bLength 7
      bDescriptorType 5
      bEndpointAddress 0x02 EP 2 OUT
      bmAttributes 2
      Transfer Type Bulk
      Synch Type None
      Usage Type Data
      wMaxPacketSize 0x0200 1x 512 bytes
      bInterval 1


      However after using the slide switch to power off/on the board it comes online on USB as

      Bus 001 Device 005: ID 1366:0105 SEGGER J-Link
      Device Descriptor:
      bLength 18
      bDescriptorType 1
      bcdUSB 2.00
      bDeviceClass 239 Miscellaneous Device
      bDeviceSubClass 2
      bDeviceProtocol 1 Interface Association
      bMaxPacketSize0 64
      idVendor 0x1366 SEGGER
      idProduct 0x0105
      bcdDevice 1.00
      iManufacturer 1 SEGGER
      iProduct 2 J-Link
      iSerial 3 000682979319
      bNumConfigurations 1
      Configuration Descriptor:
      bLength 9
      bDescriptorType 2
      wTotalLength 0x0062
      bNumInterfaces 3
      bConfigurationValue 1
      iConfiguration 4
      bmAttributes 0x80
      (Bus Powered)
      MaxPower 100mA
      Interface Association:
      bLength 8
      bDescriptorType 11
      bFirstInterface 0
      bInterfaceCount 2
      bFunctionClass 2 Communications
      bFunctionSubClass 2 Abstract (modem)
      bFunctionProtocol 0
      iFunction 5
      Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 0
      bAlternateSetting 0
      bNumEndpoints 1
      bInterfaceClass 2 Communications
      bInterfaceSubClass 2 Abstract (modem)
      bInterfaceProtocol 1 AT-commands (v.25ter)
      iInterface 5
      CDC Header:
      bcdCDC 1.10
      CDC Call Management:
      bmCapabilities 0x03
      call management
      use DataInterface
      bDataInterface 1
      CDC ACM:
      bmCapabilities 0x06
      sends break
      line coding and serial state
      CDC Union:
      bMasterInterface 0
      bSlaveInterface 1
      Endpoint Descriptor:
      bLength 7
      bDescriptorType 5
      bEndpointAddress 0x83 EP 3 IN
      bmAttributes 3
      Transfer Type Interrupt
      Synch Type None
      Usage Type Data
      wMaxPacketSize 0x0040 1x 64 bytes
      bInterval 4
      Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 1
      bAlternateSetting 0
      bNumEndpoints 2
      bInterfaceClass 10 CDC Data
      bInterfaceSubClass 0
      bInterfaceProtocol 0
      iInterface 6
      Endpoint Descriptor:
      bLength 7
      bDescriptorType 5
      bEndpointAddress 0x81 EP 1 IN
      bmAttributes 2
      Transfer Type Bulk
      Synch Type None
      Usage Type Data
      wMaxPacketSize 0x0200 1x 512 bytes
      bInterval 1
      Endpoint Descriptor:
      bLength 7
      bDescriptorType 5
      bEndpointAddress 0x02 EP 2 OUT
      bmAttributes 2
      Transfer Type Bulk
      Synch Type None
      Usage Type Data
      wMaxPacketSize 0x0200 1x 512 bytes
      bInterval 1
      Interface Descriptor:
      bLength 9
      bDescriptorType 4
      bInterfaceNumber 2
      bAlternateSetting 0
      bNumEndpoints 2
      bInterfaceClass 255 Vendor Specific Class
      bInterfaceSubClass 255 Vendor Specific Subclass
      bInterfaceProtocol 255 Vendor Specific Protocol
      iInterface 7
      Endpoint Descriptor:
      bLength 7
      bDescriptorType 5
      bEndpointAddress 0x85 EP 5 IN
      bmAttributes 2
      Transfer Type Bulk
      Synch Type None
      Usage Type Data
      wMaxPacketSize 0x0200 1x 512 bytes
      bInterval 1
      Endpoint Descriptor:
      bLength 7
      bDescriptorType 5
      bEndpointAddress 0x06 EP 6 OUT
      bmAttributes 2
      Transfer Type Bulk
      Synch Type None
      Usage Type Data
      wMaxPacketSize 0x0200 1x 512 bytes
      bInterval

      This is the operation mode we need. The fact that it presents itself as 2 very different SEGGER devices is very anoying.
      I checked with JLinkConfig, the SEGGER driver is the latest available.

      As this is on Linux, it would be nice if usb_modeswitch could be used here. I don't know the proper arguments for it.

      best regards

      Kees

    • Hi,

      The PID used depends on what features are reported on the USB level.
      PID 0x0105 is the default for that kit which means J-Link + VCOM + drag & drop.
      The 0x0101 you are seeing is most probably the bootloader of the OB because the bootloader does not support VCOM + drag & drop.
      We must use a different PID when reporting different features for the same S/N because otherwise the host OS may get confused.
      Same S/N but different feature set must be handled as a different "product" (PID) on the host side.

      Why do you think you need J-Link to report PID 0x0101?
      Why should you as a user of J-Link care about the PID at all?


      BR
      Alex
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