K21DN512 USB1.1

[fredfu]

Hi,

   My customer--Fujian Landi want to use low speed USB device for K21, now USB can't work well. i tried the customer's problem,  I pull up 1.5K resistor in D-, and run KSDK1.2.0 USB HID device example in TWR-K21D50M,PC can't recognize the device. I read the K21DN512 RM, and found RM only mention OTG supports FS device. K21DN512 can support LOW SPEED device? and How to run LOW SPEED USB examples? Thanks.

Best Regards,

Fred Fu

[isaacavila]

Hello Yanrong Fu,

As you may notice, Reference manual says Low Speed functionality is only available when board is configured as Host (That is why, in next point it says that USB transceiver includes internal pulldowns on D+ and D- lines for host mode functionality). So basically, this MCU does not support Low Speed when configured as Device.

Sorry for inconvenience it may cause!

Best Regards,

Isaac

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