AnsweredAssumed Answered

Low power USB host solution

Question asked by hoo2 on Mar 30, 2013
Latest reply on Mar 30, 2013 by Clive One
Hi all,

I'm using STM32F100 processors for a while now and i had no issue so far.

I'm looking for a solution that provides USB host functionality to a Flash disk but it must  be powered by battery, so it must by energy efficient. I'm new to USB(first project) so correct me if I am "from out of space" here.

Now. The data transfer will be very very small and I plan to keep USB disabled for most of the time. Only 5-6 writes and reads per day. And the file-sizes will be 2-3 Kb. I found stm32L151-2 cpu and it is pretty good actually. It fits all my other requirements, but I believe it provides only USB device functionality, no USB host. Is there any way to run a usb host library (even if it is from a 3rd party) in that cpu?
If not what is the most energy efficient ST Cortex-m3 cpu for usb host? The usb speed is not important.

I wander if it is possible to use an external USB host controller with the libraries provided by ST or its partners. And how easy is that?

I use my own OS(preemptive multitasking kernel for Cortex-M3/M4) and my Fat32 library and I had no issue with that so far. I dont know if it is problem now.

Christos Houtouridis