On 4/11/06, <b class="gmail_sendername">Bob Lees</b> <<a href="mailto:bob@diamond.demon.co.uk">bob@diamond.demon.co.uk</a>> wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I would echo David's original question, is there any reason why the OTG mode<br>could not be used to switch from master to slave mode, driven from a command<br>or voltage sensing on the 770. After all as has been noted elsewhere the 770
<br>needs 5volts supply fed to it when in master mode so something in the 770 is<br>already sensing this.<br><br>Or put another way why do we have to use flasher to switch USB modes?<br><br>Bob</blockquote><div><br>Hi Bob,
<br><br>I would guess since they made the decision early on to not fully utilize the USB host mode, they didn't put in the circuitry to condition their 3.7 V (as Santeri just mentioned) up to an approriate 5 V. To save even more power the don't even power the USB circuitry internally when the 770 is on.
<br><br>So without it being powered, it can't be switched. That is why you need to do it through the flasher since that supplies the power at the same time.<br></div></div><br>Now, having said that, I don't think that prevents someone knowledgeable enough, who has some power-hacked hub, from also hacking together a utility to use on the 770 to switch modes once that hub is connected. I would imagine it would be low level kernel hacking though.
<br><br>While I would love to see this utility, I would rather the Nokia devs spend their time working on stability, fixing the apps they do ship and getting in an update/install infrustructure that allows things like third-party kernel modules first.
<br><br>/Mike