K22F cdc access from .NET

shuichiy — Thu, 18 Oct 2018 06:31:53 GMT

Hi all,

USB CDC I/F is now running on MK22FN12810LVH and a terminal program can access it normally.

However, .NET application freezes during the first data transfer (serialport.write) even if port open has no problem.

When I used KL27Z256 before, following workaround cleared the similar problem but it does not work this time.

Does someone has workaround to work K22F and .NET applications via CDC ?

#if 0
// DIsable Transaction for .NET applications
            if (acmInfo->dteStatus & USB_DEVICE_CDC_CONTROL_SIG_BITMAP_DTE_PRESENCE)
            {
                /* DTE_ACTIVATED */
                if (1 == s_cdcVcom.attach)
                {
                    s_cdcVcom.startTransactions = 1;
}

   - snip -
            }
            else
            {
                /* DTE_DEACTIVATED */
                if (1 == s_cdcVcom.attach)
                {
                    s_cdcVcom.startTransactions = 0;
                }
            }
#endif

Re: K22F cdc access from .NET

shuichiy — Thu, 18 Oct 2018 07:08:46 GMT

I use SDK_2.4.1_MK22FN128xxx10 and both usb_device_cdc_vcom and usb_device_cdc_vcom_lite samples have the same situations.

Re: K22F cdc access from .NET

shuichiy — Thu, 18 Oct 2018 08:20:00 GMT

Probably I have self-fixed the issue.

I needed to comment out more codes in virtualcom.c regarding to transactions.

Thanks.

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