From: siempre.aprendiendo <sie...@gm...> - 2008-03-09 11:10:28
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Hello everyone, What would I need to have a working verdex + USB host? A verdex motherboard, of course, for example XM4-bt, and ... more electronics? connectors? cables? >From http://docwiki.gumstix.org/USB_host and from http://docwiki.gumstix.org/USB_24_Pin I have read this: "In addition, you need to pull USBH_PWR1 (pin 20) up to 3.3 volts to enable the port. You need to provide a stable 3.3 volt supply, which is fairly simple to do by adding a small SOT23 package voltage regulator (like the LM3480), with the power input coming from V_BATT (pin 24) and the output going to USBH_PWR1 (pin 20)." and now I'm confused. Thanks in advance. |
From: <pa...@pa...> - 2008-03-09 11:45:12
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siempre.aprendiendo wrote: > I have read this: > > "In addition, you need to pull USBH_PWR1 (pin 20) up to 3.3 volts to > enable the port. You need to provide a stable 3.3 volt supply, which is > fairly simple to do by adding a small SOT23 package voltage regulator > (like the LM3480), with the power input coming from V_BATT (pin 24) and > the output going to USBH_PWR1 (pin 20)." > > and now I'm confused. I haven't had an opportunity to use the 24-pin port yet, but I don't understand this either. According to the PXA270 datasheet, USBHPWR<3:1> are inputs used to signal over-current faults. I would tie them to GND, unless the driver is configuring them to have reverse polarity. Note that you can do USB host with a 60-pin daughterboard too: http://docwiki.gumstix.org/Frequently_asked_questions/verdex#Can_the_existing_60-pin_boards_that_have_USB_device_be_used_with_a_verdex_motherboard_to_provide_USB_Host.3F Pascal |
From: Marc H. <mhu...@lo...> - 2008-03-09 15:03:28
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The simplest solution is to get one of the verdex motherboard and a ConsoleVX or ConsoleVX-LCD. This console boards have a USB host connector already wired and basically works out of the box. In addition you'll need a USB gender changer, and if this is your first purchase then definitely get the NULL modem serial cable and a power adapter. The serial cable plugs into the console board and is a minimum requirement for downloading files and new images to the motherboard. Either of the Ethernet cards with CF or SD slot on it is also very useful for image transfer as it is a lot quicker, even if you don't intend to use Ethernet or additional storage in your end application. -----Original Message----- From: gum...@li... [mailto:gum...@li...] On Behalf Of siempre.aprendiendo Sent: Sunday, March 09, 2008 7:10 AM To: gum...@li... Subject: [Gumstix-users] Question about Verdex and USB host Hello everyone, What would I need to have a working verdex + USB host? A verdex motherboard, of course, for example XM4-bt, and ... more electronics? connectors? cables? >From http://docwiki.gumstix.org/USB_host and from http://docwiki.gumstix.org/USB_24_Pin I have read this: "In addition, you need to pull USBH_PWR1 (pin 20) up to 3.3 volts to enable the port. You need to provide a stable 3.3 volt supply, which is fairly simple to do by adding a small SOT23 package voltage regulator (like the LM3480), with the power input coming from V_BATT (pin 24) and the output going to USBH_PWR1 (pin 20)." and now I'm confused. Thanks in advance. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ gumstix-users mailing list gum...@li... https://lists.sourceforge.net/lists/listinfo/gumstix-users |