topic Re: USB-KW24D512 system reset will cause USB CDC module reset as well in Kinetis Microcontrollers

USB-KW24D512 system reset will cause USB CDC module reset as well

xiaoma — Thu, 16 Feb 2017 06:20:25 GMT

Hi,

I'm using USB CDC Driver of USB-KW24D512 Dongle as a virtual com port on Windows OS. I can use Putty to communicate with the USB Dongle.

One requirement for me now is that when the MCU occurs a software reset (for example, set the SYSRESETREQ bit), I would like not to reset USB CDC module. If so, I need to restart the putty to connect with the device again. This is doable for manual configuration, however, that would not be a good way for automation software.

Therefore, is there a way to bypass the USB CDC module reset when a system reset occurs or is there a kind of Reset which only erases the RAM memory?

Thanks for any help.

Re: USB-KW24D512 system reset will cause USB CDC module reset as well

jorge_a_vazquez — Wed, 22 Feb 2017 04:45:25 GMT

Hi Xiao

Unfortunately USB FS module from the KW24 is a main module and there is not possible reset that could keep this module on. All resets will cause your USB mdoule to also reset. Sorry for the inconveniences that this may cause you.

Best Regards

Jorge Alcala

Re: USB-KW24D512 system reset will cause USB CDC module reset as well

xiaoma — Wed, 22 Feb 2017 05:38:13 GMT

Hi Jorge,

Thanks a lot for your confirmation. Never mind, I will investigate one possible solution from application layer to deal with this situation.

Thanks,

Xiao