USB host mode
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USB host mode can allow the user to connect various hardware devices to the N800 just like a regular computer. There are limitations however, there is limited power and only a few device types will work.  
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USB host mode allows you to connect various USB devices (external hard drives, digital cameras, card readers, input devices, etc.) to your just like a regular computer. There are, however, a few limitations. The device must draw under 100mA (this can be bypassed by using a powered hub), and you will need a hardware adaptor to plug a fullsize USB cable into the tablet's undersized one.
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Some examples of devices that may work include:
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== USB On-The-Go ==
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* Mass storage - works (some usb sticks require more power than the n800 can handle - put a self-powered hub between the devices and the n800)
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* Digital Camera  - works
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* HID - keyboards work, mice are detected, but need [http://www.internettablettalk.com/forums/showthread.php?p=153019 some setup] to work usefully (same troubles as BT mice).
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* Serial - works, needs kernel module to be compiled and inserted (do not forget to insmod usbserial.ko first)
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* Ethernet - works, needs kernel module to be compiled and inserted (tested with 3Com USB Ethernet 3C460B, module pegasus.ko)
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* GPS - works, but only in combination with gpsd and only in maemo-mapper (Nokia Mapper/Wayfinder requires a BT gps) (tested with magellan explorist in usb nmea 2.1 mode with cdc_adm.ko module)
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The USB port on the tablets is a [http://en.wikipedia.org/wiki/USB_On-The-Go USB OTG], this means that they can be switched between client- (where you plug the tablet into a computer—for flashing and mounting cards on the computer), and host- (where the tablet acts like a computer) mode with the correct hardware adaptor.
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In order for the n800 to enter into host mode you need to flash the N800 to OS 2008 and obtain the correct adapter. What is required is a USB A (Female) to USB Mini-B (Male) OTG cable (sometimes called a OTG convertor cable).  
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You can find a professionally modified USB OTG adapter designed specifically to provide automatic host-mode functionality on the N800 [http://www.electronicproductonline.com/catalog/product_info.php?products_id=1781 here]. Ensure your tablet is running OS 2008, the device you want to use is supported, and plug it in using the adapter; the tablet will automatically switch into host mode and your device should be ready to use. (larger devices such as hard drives/etc require external power; see the note above)
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You can find a USB OTG adapter designed specifically for the [http://www.electronicproductonline.com/catalog/product_info.php?products_id=1781 N800] and the [http://www.internettablettalk.com/forums/showthread.php?t=16284 N810]. These OTG adaptors will automatically switch the tablet into host-mode when plugged in.
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Alternative adapters that have the correct connections but that are NOT confirmed to do automatic switching can be found here UK [http://www.amazon.co.uk/exec/obidos/ASIN/B000EORX7U/shopzilcouk-computer-software-21/ref=nosim]
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You can also buy a "dumb" adapter that will provide the correct connections, but will not automatically switch the tablet into host-mode from most online and some in-store retailers. Then you can simply switch into host-mode manually.
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and here using Google Product seach [http://www.google.com/products?q=uSB+A+Female+to+USB+Mini-B+Male&btnG=Search&show=dd]. *some report these cables and others advertized as OTG have the proper end connectors but don't automatically start host mode.  The only report I have seen of true OTG behavior is a Big Lots adapter kit.  For current info on the search for OTG connectors see this thread[http://www.internettablettalk.com/forums/showthread.php?t=15705].  
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Using a seprate powered USB hub is a good idea when connecting devices that have more power needs.
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== Switching modes with software ==
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There are two options for switching between client- and host-mode in software. If you want to switch modes using a statusbar application, install the [https://garage.maemo.org/projects/usb-otg-plugin/ usb-otg-plugin], if you prefer to use a separate application for switching modes, then install [http://maemo.org/downloads/product/OS2008/usbcontrol/ USB Control]. Both pieces of software accomplish the same thing, they just provide slightly different interfaces to do it.
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'''How to manually set the N800 with OS2008 to host mode.'''
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For use with typical or non-OTG connections. For example the USB cable that ships with the N800 combined with a Female A to A gender Bender.
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1. Download becomeroot
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http://eko.one.pl/maemo/dists/bora/user/binary-armel/becomeroot_0.1-2_armel.deb
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2. Open Xterm and type:
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  2.a. sudo gainroot
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  2.b. echo host> /sys/devices/platform/musb_hdrc/mode
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    -You will see a 'USB device not Supported' message, then it will work.
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    -Inserting a USB drive opened File Manager to the new drive.
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    -Insufficient power will cause some devices to perform erratically.
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3. To set N800 back to OTG mode, do:
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  3.a. echo otg > /sys/devices/platform/musb_hdrc/mode
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Hint: Copy/Paste /sys/devices/platform/musb_hdrc/mode or use tab-completion. Type /sys/de <tab>/pla <tab>/mu <tab> and it will autocomplete the command line for you.
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== Switching modes manually ==
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For more information see the forum Discussion on the Topic.[http://www.internettablettalk.com/forums/showthread.php?t=4177]
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To manually switch USB modes, you must first have [[Root_access#rootsh|rootsh]] installed, then open xterm and type:
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sudo gainroot
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echo host > /sys/devices/platform/musb_hdrc/mode
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If the system does not detect cable events after switching back to OTG mode,
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The tablet will then be in host-mode and you can use your USB peripherals. To set the tablet back to client mode, open xterm again and type:
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switch it to peripheral mode first, then to OTG mode as follows [http://muru.com/linux/n800-usb-host]:
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echo peripheral > /sys/devices/platform/musb_hdrc/mode
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  echo otg > /sys/devices/platform/musb_hdrc/mode
  echo otg > /sys/devices/platform/musb_hdrc/mode
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'''A Simple Method of setting the N8X0 with OS2008 to host mode - 'Extras' App'''
 
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A simple script for entering Host and OTG modes on the N8X0 with OS2008 (courtesy of Mara).  It accomplishes the above, but in a more elegant (read: Newbie-friendly) way!  It allows easier switching into and out of Host mode, without going to the command line in Xterm each time.
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[[Category:Users]]
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After completion of the steps below, you will have an entry under 'Extras' for entering Host mode, and OTG mode.  Pre-requisiste apps are: becomeroot
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Adapted from [http://www.internettablettalk.com/forums/showpost.php?p=119080&postcount=12 Mara's original post].
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1. Unzip the files at [http://www.internettablettalk.com/forums/showpost.php?p=119080&postcount=12 Mara's post], and copy the Host.sh and Otg.sh to /home/user/MyDocs
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2. change the scripts to be executable by running:
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2.a. chmod +x Host.sh
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2.b. chmod +x Otg.sh
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3. As root user, copy host.desktop and otg.desktop to /usr/share/applications/hildon
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That's it!  Now, you should have two applications under 'Extras' to enable you to switch between modes.
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'''Another Simple Method of setting the N8X0 with OS2008 to host mode - Status Bar Switch.'''
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Another way to have easy access to Host and OTG modes was proposed by [http://www.internettablettalk.com/forums/showpost.php?p=119415&postcount=240 mplawner.]
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After completion of the steps below, you will have an icon in the status bar that shows your CPU and MEM usage (osso-statusbar-cpu).  By tapping this icon, you will be able to see a drop-down menu where you can select to enter either Host or OTG modes. 
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Pre-requisiste apps are: becomeroot
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1. Unzip the files at [http://www.internettablettalk.com/forums/showpost.php?p=119080&postcount=12 Mara's post], and copy the Host.sh and Otg.sh to /home/user/MyDocs
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2. change the scripts to be executable by running:
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2.a. chmod +x Host.sh
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2.b. chmod +x Otg.sh
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3. Install osso-statusbar-cpu application from the following site: http://people.debian.org/~tschmidt/maemo/chinook/osso-statusbar-cpu/
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4. In the Settings-->Command menu of the osso-statusbar-cpu application, enter the commands below along with a description:
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4.a. /home/user/MyDocs/Host.sh
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4.b. /home/user/MyDocs/Otg.sh
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5. Edit the /etc/sudoers file and add the following lines to the bottom of the file
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user ALL = NOPASSWD: /home/user/MyDocs/Host.sh
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user ALL = NOPASSWD: /home/user/MyDocs/Otg.sh
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Ensure that the /etc/sudoers file retains the 0440 file access permissions, or else bad things will happen!
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That's it!  Now you can switch between OTG and Host mode by simply clicking on the osso-statusbar-cpu application icon in the status bar and selecting the description title you gave in Step 4.
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Urho Konttori (author of UKMP) has released an application that makes doing this easy too.
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http://konttoristhoughts.blogspot.com/2008/02/usbcontrol-and-theme-maker.html
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usbcontrol (above) is reported to have problems with ukki's ntfs  support.
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You can also use Kate Alhola's statusbar plugin:
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https://garage.maemo.org/projects/usb-otg-plugin/
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6. Use shortcuts: http://www.internettablettalk.com/forums/showthread.php?t=20997&page=7, thread #63; no commands, no scripts, just enter the following lines as a HWR shortcuts as described in the link:
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USB host
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uh: echo host > /sys/devices/platform/musb_hdrc/mode
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USB unhost/OTG
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uu: echo otg > /sys/devices/platform/musb_hdrc/mode
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[[Category:Internet Tablet Talk]]
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Revision as of 18:05, 19 August 2008

USB host mode allows you to connect various USB devices (external hard drives, digital cameras, card readers, input devices, etc.) to your just like a regular computer. There are, however, a few limitations. The device must draw under 100mA (this can be bypassed by using a powered hub), and you will need a hardware adaptor to plug a fullsize USB cable into the tablet's undersized one.

USB On-The-Go

The USB port on the tablets is a USB OTG, this means that they can be switched between client- (where you plug the tablet into a computer—for flashing and mounting cards on the computer), and host- (where the tablet acts like a computer) mode with the correct hardware adaptor.

You can find a USB OTG adapter designed specifically for the N800 and the N810. These OTG adaptors will automatically switch the tablet into host-mode when plugged in.

You can also buy a "dumb" adapter that will provide the correct connections, but will not automatically switch the tablet into host-mode from most online and some in-store retailers. Then you can simply switch into host-mode manually.

Switching modes with software

There are two options for switching between client- and host-mode in software. If you want to switch modes using a statusbar application, install the usb-otg-plugin, if you prefer to use a separate application for switching modes, then install USB Control. Both pieces of software accomplish the same thing, they just provide slightly different interfaces to do it.

Switching modes manually

To manually switch USB modes, you must first have rootsh installed, then open xterm and type: 

sudo gainroot
echo host > /sys/devices/platform/musb_hdrc/mode

The tablet will then be in host-mode and you can use your USB peripherals. To set the tablet back to client mode, open xterm again and type: 

echo otg > /sys/devices/platform/musb_hdrc/mode
Retrieved from "http://wiki.maemo.org/USB_host_mode"