topic Re: PN7642 Mass Storage Device Activation in NFC

PN7642 Mass Storage Device Activation

MLang — Wed, 10 Jan 2024 18:09:53 GMT

I am attempting to flash the firmware required for the Cockpit application on to a PNEV7642A development board. I am unable to get the USB port to enumerate as a mass storage device on my PC.

I think that I have the host interface correctly configured for USB using switches 5, 6, and 7. I have held down and released various combinations of the the VEN and DWL_REQ buttons without success.

The unit is powered from a 7.5V supply on J9.

I've read through through the various applications guides and these are main things that appear to be required.

What am I doing wrong? Thanks.

Re: PN7642 Mass Storage Device Activation

Fabian_R — Thu, 11 Jan 2024 01:18:48 GMT

Hello sir,
My name is Fabian, I'm happy to help you with your case.
Thank you for your interest in our products. Would you mind sending us a photo of your setup just to scratch any possible issues?

Re: PN7642 Mass Storage Device Activation

MLang — Wed, 17 Jan 2024 18:40:08 GMT

I resolved this myself.

If the PNEV7642A is not connected to the LPC55S16 dev board, the AD_NFC_HOSTSEL2 line is unterminated and allowed to float. This can prevent the USB interface from being enabled. Terminating this line to +3.3V properly enabled the USB interface allowing proper mass storage device operation.

This should probably be included as a note in the quick start guide.