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Can i modify the product description string of the CC2538 usb-cdc?

Thomas Hartwig
Expert 1460 points
Other Parts Discussed in Thread: CC2538

Hello,

Im using the CC2538 with ZNP firmware via usb-cdc interface and it identifies itself to the system with the following properties: 

> vendorID: 0x0451, productID: 0x16C8, name: CC2538 USB CDC

Is is it possible to change the product description string in the firmware to something different? I need to be able to uniquely identify different versions of the hardware via usb. On a FTDI I can change this string quite easy via the FT-Prog tool from FTDI. Can I modify this string in the firmware source of the ZNP firmware somehow?

Thanks a lot!

  • 0
    Guru 735685 points
    I think you can test to know it.
  • 0 in reply to YiKai Chen
    Expert 1460 points

    But how? Wehere in the source can I find this? I could not find the place where the " CC2538 USB CDC" string is assigned e.g.

  • 0
    Guru 735685 points
    I am a little bit confused. CC2538 ZNP provides UART or SPI interface not USB CDC. Where do you get CC2538 ZNP project with USB CDC capability?
  • 0 in reply to YiKai Chen
    Expert 1460 points
    Hello,

    id like to bring this up once more. After the release of the ZNP 3.0.0 it seems that USB support is "official" since I can just enable the define "HAL_UART_USB" and I will gain USB compatibility. But I still have the same problem, I'd like to modify the product string which seems to be buried somewhere in the usblib which comes precompiled with the stack (Components/usblib/cc2538/bin/iar/usbcdc.lib). Is there any way to change the product description string from this prebuild lib?
  • 0 in reply to Thomas Hartwig
    TI__Expert 8950 points
    Hi Thomas,

    You can try downloading the cc2538 foundation firmware and changing/recompiling usblib.

    www.ti.com/.../CC2538-SW
  • 0 in reply to JasonB
    Expert 1460 points

    Hey,

    thanks a lot for the tip!

    I just found this answer by myself like 10 min before you posted it. I'll try to explain it in a little more detail if someone else comes across the same problem:

    • the productID string is determined by the included usbcdc.lib file its by default set to "CC2538 USB CDC".
    • this lib used in the newest zstack release (3.0.0) is still the same like in the foundation firmware which can be downloaded where JasonB linked. Its version 1.0.1
    • to change this string you can open the usbcdc iar project file (cc2538_foundation_firmware_1_0_1_0\usblib\cc2538\projects\iar\usbcdc.eww) and change the corresponding char array in the file "app_usb_descriptor.c" and its correct length in "app_usb_descroptor.h"
    • then just compile the usbcdc.lib file and replace the one which is in the zstack (Components\usblib\cc2538\bin\iar\)

    Thanks to everyone who helped me finding the solution, cheers!

    Thomas