LPC MicrocontrollersのトピックRe: Spurious detach interrupts with LPC55s28

Spurious detach interrupts with LPC55s28

AraStep — Wed, 13 Nov 2024 15:13:17 GMT

We are developing a mouse/dongle product based on the LPC55s28.
When the device is in suspend mode, it receives spurious detach interrupts (USB_LPC3511IP_DEVCMDSTAT_VBUS_DEBOUNCED)
We are using the USB_PreLowpowerMode() function from the mouse examples in the SDK.

This function writes a 2 into the PWRUP_CMPS field of USBPHY->USB1_VBUS_DETECT

USBPHY->USB1_VBUS_DETECT_SET = USBPHY_USB1_VBUS_DETECT_PWRUP_CMPS(0x02);

However, the data sheet indicates that valid values for this field are 0 or 7.
Can you explain the effect this will have? When we changed the value to 7, the spurious IRQs stopped.
Thanks,
Ara Stepanian

Re: Spurious detach interrupts with LPC55s28

Alice_Yang — Thu, 21 Nov 2024 03:23:59 GMT

Hello @AraStep

Thanks for your patience.

Could you please tell me which mouse example, and also share your project, I will help to check on my side. Thanks.

Alice

Re: Spurious detach interrupts with LPC55s28

AraStep — Thu, 21 Nov 2024 14:06:37 GMT

Hi Alice,

If you look in SDK_2_16_100_LPC55S28, all the usb examples for the LPC55c28 have the following:

USBPHY->USB1_VBUS_DETECT_SET = USBPHY_USB1_VBUS_DETECT_PWRUP_CMPS(0x02);

Our project is based on one of the usb suspend resume device examples.

Re: Spurious detach interrupts with LPC55s28

Alice_Yang — Thu, 28 Nov 2024 03:24:32 GMT

Hello @AraStep

Please tell us the specified USB demo you are refer to I have not found a demo that configures PWRUP_CMPS to 2.

By default value is 0x7, means VBUS_VALID comparator is enabled.

Alice

Re: Spurious detach interrupts with LPC55s28

AraStep — Fri, 29 Nov 2024 14:43:23 GMT

Find attached the usb examples from your mcux-sdk-examples-MCUX_2.16.100
All of them contain the following for the HS USB port:

USBPHY->USB1_VBUS_DETECT_SET = USBPHY_USB1_VBUS_DETECT_PWRUP_CMPS(0x02);

Re: Spurious detach interrupts with LPC55s28

Alice_Yang — Thu, 05 Dec 2024 10:42:19 GMT

Hello @AraStep

Thanks for your reply. I is confirming with internal, I will send to you with any update. Thanks.

Alice