nRF Command Line Tools: nrfdfu.dll 32bit version problem when updating nRF9160 firmware

[Peter]

Dear support team,

we use the Nordic nrfdfu.dll (64bit) in our Win11 C#/.Net application for modem update which works fine.
When we switch our application to 32bit process and change to the Nordic nrfdfu.dll (32bit) the modem update functionality no longer works. The communication start between PC application and nRF9160 modem seems to fail and the application hangs until we stop it after some minutes.

Via DllImport we use the following methods of the nrfdfu.dll: 

        [DllImport(nrfDfuDllName, EntryPoint = "NRFDFU_connect_to_mcuboot_target", CallingConvention = CallingConvention.Cdecl)]
        [DllImport(nrfDfuDllName, EntryPoint = "NRFDFU_connect_to_modemdfu_target", CallingConvention = CallingConvention.Cdecl)]
        [DllImport(nrfDfuDllName, EntryPoint = "NRFDFU_program_package", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
        [DllImport(nrfDfuDllName, EntryPoint = "NRFDFU_close_connection", CallingConvention = CallingConvention.Cdecl)]
        [DllImport(nrfDfuDllName, EntryPoint = "NRFDFU_verify_package", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]

Do you have any idea what the reason could be?

Best regards,

Peter   

[Menon]

Hello,

I am not aware of any known issues related to a 32-bit process. Could you please check whether nrfdfu.h is present in your installation (it is typically located under the include\ folder in the nRF Command Line Tools installation directory)? Please see the section Windows file structure.

Kind Regards,

Abhijith

[Peter]

Hello Abhijith,

thank you for the response. We will check and come back to you.

Best regards,

Peter