nRF52840 change USBD Serial Number

[AntonHellbe]

Hi,

I'm using the USBD for HID keyboard on my nRF52840 and I'm trying to change the serial number. On my PC (Linux) the Serial number always appears as 0 using lsusb -v. Checking it on windows 10 the Serial number is blank.

I followed the instructions here: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.0.0/lib_usbd_string_desc.html

Setting EXTERNAL 1 and creating my own descriptor did not work. I've also tried to modify the default SERIAL string (change one character to '1') without any result.

Furthermore I also tried to use the function: app_usbd_serial_num_generate(), still the Serial number comes up as 0 or blank depending on operating system.

One observation is that the USBD Hid appears with the name "Holtek Semiconductor" and not "Nordic Semiconductor" which is specified in the app_usbd_string_config.h file. It seems like it USBD doesnt use the configuration inside the app_usbd_string_config.h.

HW: nRF52840 PCA10056

SDK: v15.0

Softdevice: S140 V6.0

Br,
Anton

[Øyvind]

Hi Anton, 

I'm using the USBD for HID keyboard on my nRF52840 and I'm trying to change the serial number.

 Can you please specify which example you are using? Just so I can try to reproduce.

One observation is that the USBD Hid appears with the name "Holtek Semiconductor" and not "Nordic Semiconductor" which is specified in the app_usbd_string_config.h file.

 Where did Holtek Semiconductor come from? Is this something you've added?

Thanks,
Øyvind

[AntonHellbe]

Hi Öyvind,

 Can you please specify which example you are using? Just so I can try to reproduce.

My project is based on examples/peripheral/usbd_hid_composite (Everything regarding HID mouse is removed)

 Where did Holtek Semiconductor come from? Is this something you've added?

I have no idea honestly, I have checked the config folder where the "app_usbd_string_config.h" file is located. And it clearly says "Nordic Semiconductor".

Here is the output from lsusb -v

bus 001 device 007: id 04d9:0295 holtek semiconductor, inc.                     
1389 device descriptor:                                                              
1390   blength                18                                                     
1391   bdescriptortype         1                                                     
1392   bcdusb               2.00                                                     
1393   bdeviceclass            0 (defined at interface level)                        
1394   bdevicesubclass         0                                                     
1395   bdeviceprotocol         0                                                     
1396   bmaxpacketsize0        64                                                     
1397   idvendor           0x04d9 holtek semiconductor, inc.                          
1398   idproduct          0x0295                                                     
1399   bcddevice            2.07                                                     
1400   imanufacturer           0                                                     
1401   iproduct                1 usb-hid keyboard                                    
1402   iserial                 0                                                     
1403   bnumconfigurations      1    

[AntonHellbe]

Hi,

You are correct, I was looking at the wrong device. So I guess the problem is that the USBD HID does not appear as a device at all. The only thing that appears when i plug in the devkit is the standard "SEGGER J-Link"

[Øyvind]

What USB connector are you using to connect the board? nRF USB I presume? 

There is a bug in the documentation for SDK15.0 which does not state what USB should be connected:'

SDK15.0

vs SDK15.3

[AntonHellbe]

I'm using a micro USB cabel to the micro usb connector that is soldered to the devkit (cannot find any label for it).

I will flash the composite example and see what happens.

[Øyvind]

To clarify, after programming your board, you must change USB port to the one marked nRF USB:

Please try this, and let me know how that works

[AntonHellbe]

I apologize for this. I took a break from this project and I completely forgot about that port. It works perfectly...

Sorry for taking up your time with this silly issue.