USD endpoint busy forever

martindusek — Wed, 27 Jun 2018 21:52:25 GMT

Hi,

I implemented custom USB class with two interrupt and one bulk endpoint. I used usb_device_cdc_acm.c from SDK 2.1 as a template. USB device is full speed on MK22.

Sometimes the bulk endpoint freezes in busy state. On PC side reading from the bulk endpoint timeouts then (libusb_bulk_transfer used on PC side) even though on MCU side I can see the endpoint is in busy state transferring data.

Structure s_UsbDeviceKhciState has tranferLength = 0x28a, transferDone = 0 and state = 0x6040 forever. I have to reset MCU to reenable data transfers on my bulk endpoint.

Can you please help me diagnose the problem?

EDIT: It seems that the issue is caused by switching from HSRUN to RUN mode with USB module enabled. My CPU have to run with 120 MHz, but sometimes I need to write internal flash memory, which is not possible from HSRUN mode so I have to switch to RUN. When I don't switch from HSRUN to RUN and I disable writing to flash then this issue with frozen bulk endpoint doesn't happen, at least it seems to.

Re: USD endpoint busy forever

Hui_Ma — Mon, 02 Jul 2018 06:45:12 GMT

Hi,

Could you let us know the K22 product part number?

There with some different version of K22 product, please check here for the detailed info.

Have a great day,
Mike

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Kinetis MicrocontrollersのトピックUSD endpoint busy forever

USD endpoint busy forever

Re: USD endpoint busy forever