[FRDM-MCXN947] USB Host MSD FatFS example fails to detect USB Drive (No "Attached" event)

anhln-embedded — Tue, 17 Mar 2026 07:48:42 GMT

Hello NXP Community,
I am using the FRDM-MCXN947 development board and testing the official SDK example:
frdmmcxn947_scsi_host_msd_fatfs_bm_cm33_core0
The Issue:
After flashing the project, the serial console displays the initial message, but when I plug a USB Flash Drive into the High-Speed USB-C port (J11), nothing happens. There is no "mass storage device attached" message, and the LED on my USB drive does not light up.
Technical Details:
Hardware: FRDM-MCXN947 (Rev A).
Setup: The board is powered via J17 (MCU-Link). I am using a USB-C to USB-A OTG adapter to connect the flash drive to J11.
Observation: The same hardware (J11 and cable) works perfectly with the dev_msc_disk example. However, in Host mode (scsi_host_msd_fatfs), there seems to be no 5V VBUS output on J11 to power the USB drive.
Questions:
Does the SCSI Host MSD example for MCXN947 include the code to enable the NX5P3090 (U3) power switch?
Which GPIO pin controls the USB1_VBUS_EN on this board? Is it PIO0_22?
Are there any specific Jumper settings required to bridge the 5V supply to the USB Host path?
Thanks for your help!

Re: [FRDM-MCXN947] USB Host MSD FatFS example fails to detect USB Drive (No "Attached" eve

Alice_Yang — Tue, 17 Mar 2026 10:58:30 GMT

Hello @anhln-embedded

Could you please provide the hardware connection diagram as well as the detailed jumper configuration for the FRDM‑MCXN947? Additionally, please let me know the SDK version you are using so that I can help you verify the setup.

Thank you.

Alice

topic [FRDM-MCXN947] USB Host MSD FatFS example fails to detect USB Drive (No "Attached" event) in MCX Microcontrollers

[FRDM-MCXN947] USB Host MSD FatFS example fails to detect USB Drive (No "Attached" event)

Re: [FRDM-MCXN947] USB Host MSD FatFS example fails to detect USB Drive (No "Attached" eve