Cable for N800 host mode. - maemo.org

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	torx	2007-10-20 , 03:56
	Posts: 231 \| Thanked: 21 times \| Joined on May 2007 @ Singapore	#1

Okay, i really need help with this.

N800 must run OTG mode for the host mode to work. As N800 does not have a
mini-AB connector, you need to modify a mini-AB cable, or use a non-standard
mini-B to mini-B cable. The patches include some changes to the N800 config,
but you may want to modify the config for your needs.

MODIFIED MINI-AB CABLE

To modify a mini-AB cable for N800 host mode, you need to cut the metal
shielding off at mini-A end so the mini-A connector will fit into the mini-B
socket on N800. This modification will make the cable not stay in the socket
very well, so a mini-B to mini-B cable may be a better option.

Customizing a mini-AB cable has the advantage of grounding the USB ID pin for
role switching, and the software hack above is not needed to switch the role.

Note that mini-A connector cannot be forced to be peripheral end as it grounds
the ID line. When grounded, software cannot drive it up with a pull-up.

It should be also possible to replace the mini-B connector on N800 with a
mini-AB connector, but that is a risky operation and you may ruin your board.
I'd assume this will also void the warranty, so I don't recommend it.

Can anyone tell me what i need exactly and what i should do? All these A and B are just confusing me to no end, and i honestly don't know what's the difference.

Quote & Reply |

Ar-ras	2007-10-22 , 07:32
Posts: 54 \| Thanked: 1 time \| Joined on Jul 2007	#2

How about OS 2008?
Will the N800 get OTG ability too?

I am thinking about changing the connector to a mini-AB

Quote & Reply |

fanoush	2007-10-22 , 10:42
Posts: 2,152 \| Thanked: 1,490 times \| Joined on Jan 2006 @ Czech Republic	#3

Originally Posted by torx

All these A and B are just confusing me to no end, and i honestly don't know what's the difference.

The mini-AB cable is optional. At least with OS2007 such cable won't help you much since there is lot of stuff you need to do by hand anyway. The mini-AB will only give you possibility of automatic switch to host mode. You can still switch modes by hand so such cable is not strictly needed.

Currently (with a lot of manual fiddling) it is possible to use just usb female to female adapter and original usb cable that came with N800. Then you can connect low power devices like flash disk, mouse (won't do much) or keyboard. For more power hungry devices you need powered hub or Y cable with additional power (haven't tried Y cable).

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Quote & Reply |

Ar-ras	2007-10-22 , 10:45
Posts: 54 \| Thanked: 1 time \| Joined on Jul 2007	#4

So you dont need Power supply for the low power devices???

Quote & Reply |

fanoush	2007-10-22 , 11:07
Posts: 2,152 \| Thanked: 1,490 times \| Joined on Jan 2006 @ Czech Republic	#5

With N800 no, with N770 yes.

Quote & Reply |

Guerol	2007-12-02 , 22:29
Posts: 3 \| Thanked: 0 times \| Joined on Dec 2007	#6

Originally Posted by fanoush

Currently (with a lot of manual fiddling) it is possible to use just usb female to female adapter and original usb cable that came with N800. Then you can connect low power devices like flash disk, mouse (won't do much) or keyboard. For more power hungry devices you need powered hub or Y cable with additional power (haven't tried Y cable).

Does that mean a USB-Keyboard would actually work?