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Re: [Gumstix-users] Full-speed USB device on Overo
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From: Steve M. <mo...@sm...> - 2011-07-27 14:16:41
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Do you have the omap3 manual? I think that details the correct backend pin mode. Steve S sent out a pointer to it on one of the threads. I'm definitely interested in this functionality as well. On Jul 27, 2011, at 5:13 AM, Alexander Thomas wrote: > OK, I have figured out that I need to: > 1. disable EHCI and enable OHCI support in the kernel, > 2. remove ehci init code from board-overo.c and add missing ohci init code. > > I have to call usb_ohci_init with a ‘ohci_hcd_omap_platform_data’ struct, but I have no idea what value I should use for port_mode[1]. Given that the ehci struct uses EHCI_HCD_OMAP_MODE_PHY, it seems logical that I should use one of these four possible ohci_omap3_port_mode values: > > OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0, > OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM, > OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0, > OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM > > Which one is correct for the Overo+Tobi? > > Alexander > > On Mon, Jul 25, 2011 at 6:29 PM, Victhor <vic...@gm...> wrote: > There is a OHCI kernel module for the OMAP3 USB controller, but I never > had the opportunity to test it. > > > > On Jul 25, 2011, at 10:02 AM, Alexander Thomas wrote: > > > > > On Mon, Jul 25, 2011 at 4:43 PM, Steve Modica > > > <mo...@sm...> wrote: > > > > > > On Jul 25, 2011, at 7:30 AM, Alexander Thomas wrote: > > > > > > > Hi, > > > > Is there any expansion board for the Overo COMs that has > > > an Ethernet port and allows to directly attach a full-speed > > > USB device? We already have a Tobi but it proves to only > > > support high-speed devices. Unless I'm mistaken the only way > > > to connect a full-speed device like an USB audio device is > > > to connect it through a hub, which would complicate our > > > design considerably if we want to keep it a single unit. > > > > > > > > > You can put a full speed device on the OTG port. It's an AB > > > port so there's nothing hard about that. Get a miniAB to B > > > cable and you're all set. > > > > > > Except for the fact that the OTG port only delivers up to 100mA and > > > the audio device requires 400mA. > > > > > > The strange thing is that the OMAP3530's specifications include > > > “High-Speed/Full-Speed/Low-Speed Multiport USB Host Subsystem”. Why > > > does the port on the Tobi only support high-speed? Can it be > > > switched to low/full speed mode? We couldn't care less if that would > > > mean losing high-speed. > > > > > > > > > The Host A port has the ability to support Full Speed devices *but* > > you have to put the chip into OHCI mode and that requires a different > > back end interface (which appears to be missing). So if you want to > > do this, you have to create that backend interface > > > > > > > > Alexander > > > > > > ------------------------------------------------------------------------------ > > > Storage Efficiency Calculator > > > This modeling tool is based on patent-pending intellectual property > > > that > > > has been used successfully in hundreds of IBM storage optimization > > > engage- > > > ments, worldwide. Store less, Store more with what you own, Move > > > data to > > > the right place. Try It Now! > > > http://www.accelacomm.com/jaw/sfnl/114/51427378/_______________________________________________ > > > gumstix-users mailing list > > > gum...@li... > > > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > -- > > Steve Modica > > CTO - Small Tree Communications > > www.small-tree.com > > phone: 651-209-6509 ext 301 > > mobile: 651-261-3201 > > > > > > > > > > > > > > > > > > > > > > ------------------------------------------------------------------------------ > > Storage Efficiency Calculator > > This modeling tool is based on patent-pending intellectual property that > > has been used successfully in hundreds of IBM storage optimization engage- > > ments, worldwide. Store less, Store more with what you own, Move data to > > the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/ > > _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users > > > > ------------------------------------------------------------------------------ > Storage Efficiency Calculator > This modeling tool is based on patent-pending intellectual property that > has been used successfully in hundreds of IBM storage optimization engage- > ments, worldwide. Store less, Store more with what you own, Move data to > the right place. Try It Now! http://www.accelacomm.com/jaw/sfnl/114/51427378/ > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > ------------------------------------------------------------------------------ > Got Input? Slashdot Needs You. > Take our quick survey online. Come on, we don't ask for help often. > Plus, you'll get a chance to win $100 to spend on ThinkGeek. > http://p.sf.net/sfu/slashdot-survey_______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users -- Steve Modica CTO - Small Tree Communications www.small-tree.com phone: 651-209-6509 ext 301 mobile: 651-261-3201 |