topic Re: [TWR-K65F180M] USB VCOM example does not send ACK in Kinetis Microcontrollers

[TWR-K65F180M] USB VCOM example does not send ACK

baltech — Tue, 18 Jul 2017 10:13:31 GMT

Hi,

I was trying to get the usb_vcom example from the Kinetis SDK running on my TWR-K65F180M board.

I was able to compile it and get it running but Windows says the USB device could not be regognized.

When looking at the USB trace, I see that the board does not send an ACK to the GetDeviceDescriptor Setup packet.

Has anybody a hint where to start debugging?

Thanks,

Stefan

Re: [TWR-K65F180M] USB VCOM example does not send ACK

baltech — Tue, 18 Jul 2017 11:50:28 GMT

It works when using KHCI but I need EHCI which is not working.

Re: [TWR-K65F180M] USB VCOM example does not send ACK

Hui_Ma — Tue, 25 Jul 2017 08:40:06 GMT

Hi,

I had done a test with KSDK V2.2 for TWR-K65F180M board.

I modified the <usb_device_config.h> file to enable EHCI.

The USB CDC VCOM worked as expected:

Could you try to download the latest MCUXpresso SDK for TWR-K65F180M board package?

Please download the latest SDK software from here.

Have a great day,
Ma Hui

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Re: [TWR-K65F180M] USB VCOM example does not send ACK

baltech — Tue, 01 Aug 2017 09:19:29 GMT

Thanks!

I havent enabled EHCI like you mentioned! Now it is working!