MCF5329 with USB low-speed

Rost — Thu, 24 Feb 2011 20:52:40 GMT

Hello!

I'm trying to implement an USB-stack of my own. The (nearly) the complete handling seems to work on full-speed, but if i switch to low-speed (through d-minus pullup instead of d-plus pullup through external max3353e), nothing is working (no packets are send properly). is there a register in the mcf5329 to tell the internal transceiver that it should run on low-speed mode now? Somehow i don't see that kind of configuration.

Thanks in advance!!

Re: MCF5329 with USB low-speed

TomE — Fri, 25 Feb 2011 14:57:05 GMT

21.3.3.14 Port Status and Control Registers (PORTSCn)

...

- Port speed. This read-only register field indicates the speed the port operates. This bit is not defined in the EHCI
specification.

What is that showing?

- Line status. Reflects current logical levels of the USB DP (bit 11) and DM (bit 10) signal lines.

- High speed port. Indicates if the host/device connected is in high speed mode.
Note: This bit is redundant with the PSPD bit field.

What are they showing?

You probably have to reset the port to get it to switch (if it doesn't do that on its own).

Check section "21.5.5.6.2 Discovery"

topic MCF5329 with USB low-speed in ColdFire/68K Microcontrollers and Processors

MCF5329 with USB low-speed

Re: MCF5329 with USB low-speed