topic USB Enable/Disable Interrupt problem in MCUXpresso SDK

USB Enable/Disable Interrupt problem

danielebruno — Mon, 27 Jan 2020 11:53:16 GMT

Hello,

I'm using the KL26 microcontroller in one of our boards with "SDK_2.4.1_MKL26Z256xxx4"

I have a question about disabling/enabling the USB interrupts in order to masking them in a function that must not be interrupted.

The functions DisableIRQ/EnableIRQ seem not to work properly.

I implement an HID keyboard: I am able to disable the interrupt but when I try to re-enable it, the interrupt works only if I haven't pressed any key while it was disabled, otherwise any other key will be not recognized.

I use these functions "normally" to mask interrupts coming from PortC and PortD.

Are there some special precautions in order to use them for the USB port ?

Thank you for all the attention.

Best Regards

Daniele

Re: USB Enable/Disable Interrupt problem

FelipeGarcia — Wed, 29 Jan 2020 18:32:25 GMT

Hello Daniele,

I recommend you to check the below application note document that explains a little further how you can implement resume and suspend USB feature.

https://www.nxp.com/docs/en/application-note/AN5385.pdf

I hope this helps!

Have a great day,
Felipe

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