Editing N900 Hardware USB
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* the ID pin is not connected to PHY, but it is connected to GAIA | * the ID pin is not connected to PHY, but it is connected to GAIA | ||
* MUSB-core has a hw statemachine that reacts on a telegram from PHY, telling MUSB-core about ID pin grounded and to enter OTG_A hostmode now. | * MUSB-core has a hw statemachine that reacts on a telegram from PHY, telling MUSB-core about ID pin grounded and to enter OTG_A hostmode now. | ||
- | * Other PHY chips (e.g. in N810) have a command to make them send this telegram, so you can switch MUSB-core to hostmode under software control | + | * Other PHY chips (e.g. in N810) have a command to make them send this telegram, so you can switch MUSB-core to hostmode under software control. 1707 is missing this function. |
* There is apparently no way to tell MUSB-core directly to switch to hostmode in a natural way. | * There is apparently no way to tell MUSB-core directly to switch to hostmode in a natural way. | ||
* However there is a bit in MUSB-core registers called FORCE_HOST, which is switching MUSB-core into a semi-lobotomized test mode and allowed us to implement h-e-n. | * However there is a bit in MUSB-core registers called FORCE_HOST, which is switching MUSB-core into a semi-lobotomized test mode and allowed us to implement h-e-n. |
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