USB Driver for nRF52480 in linux with external CPU

[ratnakar1978]

Hi ,

  In the target hardware I am able to detect the Nordic chipset nRF52480 by flashing USBD application on the chipset using JLINK SWD.

Now I have query related how I can establish communication from Nordic chipset using USB interface to CPU ?

Which USB generic driver I need to use and where I can update VID,PID for nordic chipset?

Is there any specific driver file is required for Nordic chipset for USB communication with CPU ?

Please share your thoughts .

Thanks,

Ratnakar

[Kenneth]

Hello,

You can find an overview of the USB examples here:
http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/examples_usb.html?cp=4_0_0_4_5_50 

A good start may be the USB CDC (virtual COM port) example. Details on the USB library used by the USB examples above is found here:
http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.2.0/lib_usbd.html?cp=4_0_0_3_59 

Best regards,
Kenneth

[ratnakar1978]

Hi Kenneth, Can you please share me after programming the USB CDC ACM example program which port name I can see under "ls /dev" command. I am not seeing any ttyUSB0 or ttyACM0 port after flashing this program.

Can you please suggest how can to check this port and access the same on command prompt.

[Kenneth]

First of all make sure that it works on a Windows 10 pc, just to rule out any programming issues. If that works, then try to plug into a Linux machine for test. I a not familiar with Linux, but from the description I can find this should be straight forward. Let me know how the Windows 10 test goes first.

Best regards,
Kenneth

[ratnakar1978]

Hi Kenneth,

 Thanks for response. We already tested EVK and BLE chipset with Windows platform . Now we have customiszed the target board where host CPU having interface with Nordic chipset USB interface and we are using Yocto linux environment so we can not test Windows on target hardware. Please handover the case if somebody aware of Linux.

[Kenneth]

Can you provide a drawing on how you have connected this? 

You are using CDC example project with no modification when it fails?

[ratnakar1978]

Hi Kenneth,

  Please check below is interface diagram for nRF52480 where host CPU having USB interface with nRF52840 chipset. We are using Yocto Linux build with kernel version 4.9.51 having generic USB driver included.  Now my query is after flashing USB_CDC_ACM example how can I communicate with BLE chipset ? I am not able see any USB driver specific to BLE chipset. Please share your thoughts on this.

[Kenneth]

Conceptually it should not differ from any other cdc-acm device, so I suggest to ask a Linux community on how to mount /dev/ttyUSB0 when working with an USB virtual comport. From Googling it may seem as it has something to do with CONFIG_USB_SERIAL. (The Vendor ID (VID) is by default 1915 and Product id (PID) is 520F if not changed.)