topic Re: Multiple USB devices in one M52221? in ColdFire/68K Microcontrollers and Processors

Multiple USB devices in one M52221?

MikeD — Sat, 09 Jun 2007 04:40:29 GMT

Can I have a M52221 act as multiple USB devices at the same time? For a project at work I'm planning on using one board to act as both a mouse and a keyboard, am I going to want to put more then one M52221 on the board and a hub chip?

Thanks
Mike

Re: Multiple USB devices in one M52221?

macl — Fri, 15 Jun 2007 22:14:04 GMT

Just to clarify, you would like the MCF52221 to act in device mode, correct? I think you can make it act as multiple devices by setting up separate endpoints. This would emulate a keyboard/mouse if you connected to a PC host.

On the other hand if you want to connect both a usb mouse and usb keyboard to a single MCF52221 and have it act in host mode, then this is more tricky. I'm not exactly sure of what it would require, but I believe you would need a usb switch or mux to select each one at a time. You'd also need the driver software for the devices.

Mac

Re: Multiple USB devices in one M52221?

ericgregori — Wed, 25 Jul 2007 15:15:18 GMT

Yes, you can make the device support both a keyboard and mouse. During enumeration just report 2 configurations ( keyboard and mouse ).

I have a very detailed appnote on the CMX USB stack that may help.

If you shoot me your email address I will send it to you.

eric.gregori@freescale.com