10 years, 3 months ago.

Can the KL25Z function as USB Host using mbed libraries?

I have a FRDM-KL25Z board arriving in a few days and I would like to use it as a USB Host. Unfortunately it seems like the mbed official USBHost library (http://mbed.org/handbook/USBHost) only supports the LPC1768.

According to a post from 10 months ago (http://mbed.org/questions/573/USB-Host-for-frdm-kl25z/) there were no plans to add support for the KL25 due to non compliance with the USB OHCI specification. However, the product brief for the KL24/25 MCUs claim this (http://cache.freescale.com/files/32bit/doc/prod_brief/KL25PB.pdf): • Supports enhanced-host-controller interface (EHCI) • Allows direct connection of FS/LS devices without an OHCI/UHCI companion controller

I'm not very familiar with USB specifications, but I think it should be possible to use the KL25Z as a USB Host. I found a blog post detailing some issues with using Freescale's CodeWarrior IDE to program the KL25Z as a USB Host (http://mcuoneclipse.com/2013/03/02/usb-msd-host-for-the-freedom-board/), where the author was able to get it running after making sure the USB cable had a 5v source (the board, or at least the revision he used, has a bug that prevents 5v from being supplied to the USB port). Also, according to the same author this bug is fixed in KL25Z revision E (http://mcuoneclipse.com/2013/06/09/frdm-kl25z-reve-board-arrived/).

My questions are:

-Has anyone used the KL25Z as a USB Host with the mbed libraries/compiler? If so, how?

-If not, are there any plans to add support for this in the near future (either through the official USBHost library or otherwise)?

-Somewhat related: Does the KL26Z (which seems to have better USB functionality) work with mbed? I don't see it listed anywhere, but I think it's mostly pin compatible with the KL25Z.

Thanks,

Sam