TS3USB30: SWITCH USB over Android

what signal you switch? USB? can you send schematic?

I am switching using U1 the USB J-PC1 with J-Android, and J-android with J-Walt

can you explain how it works?

Of course, the relevant device is U1, I connected OE to a pin named BOOTLOADER that remains always in 0 for this operation.

The pin SEL controls the switching using the arduino via software, and U1 connects PC which its connector is J-PC1 to Android which its connector is J-Android. Or it connects PC to another device called WALT which its connector is J-WALT.

When I start the arduino, the connection between PC and Android starts initially, the PC is able to recognize the Android, then when I swtich the pin SEL, the connector changes to Android WALT, this connection works aswell. But when I swtich it back again to PC-Android, the PC does not detecs the Android device, and the only way to establish again the connection is by pulling out and plugging in the connector again manually.

data path for u1 should be J-android to J-pc1 or J-android to J-walt.

what signal between J-android to J-pc1, USB?

Correct, USB 2.0

how  is  Vbus  of J-PC1 connected?

VBUS of J-PC1 is open, since I dont need to provide power supply to the PC, I am using an external 5VDC source to provide power to J-Android and J-Walt

in your system, which is host, which is device?

In the system when Android and Walt are connected, Android is host, when I switch to connect Android to PC, PC is host, I control the OTG pin using the transistor Q1 and the signal SEL from the arduino.

OTG pin is ID?

can you explain the steps when switching back to PC?

Yes, OTG is connected to ID in the USB connector for the android device.

When switching back the arduino changes the signal SEL, to disconnect OTG from GND using the transistor Q1 (to put it in accesory mode), and at the same time the signal SEL controls S in the SWITCHING chip U1, that is all what it does.

what kind of cable used to connect host, OTG and device ?

I am using the same type of cable in all the ports, USB mini, it is not an OTG cable.

it seems OTG HNP sequence is not followed when switching back to host

Greetings,

So how should i handle the switcthing?, I checked that HNP sequence, and it looks like I have to switch OFF and ON too the VUSB of the Android when I want it turn the mode HOST or PERIPHERICAL mode.

did you  try toggling the android Vbus after switching back to host?

I had not thought to try that, but afterwards I tried to switch the VUSB, and it seems to work now, therefore whenever I want to switch a device toogling the OTG mode, it is important to toogle too the VUSB.

Thanks for the support!