micro-USB is not a general model.
Historically, up to USB2, you have one end which MUST be type-A, the other end MUST be type-B. USB3 cheats somewhat with extra wires, but that’s a type-C connector with extra pins. There was a new specification as miniaturization occurred…people wanted one small connector for all functions. So the “on the go” (OTG) port was invented. This micro port can receive either a type-A connector, or a type-B connector. There is an extra wire present to detect which type is plugged in. On your schematic, note that USB has only four wires…DP, DM, GND, VCC…your plug has a fifth wire. That wire is for sensing, and software should look at that to decide whether to be a device or a host. Strictly speaking, that wire is not a USB wire, it’s a mode detect.
If a type-B connector is plugged in, then the port must behave as a device. For example, a printer accepts type-B connectors. If a type-A connector is plugged in, the port belongs to a host and is a root HUB…such as your desktop computer. It is illegal to connect two type-A or two type-B connectors on the same cable.
Should a type-A connector be in the OTG port, then the port detects this and acts as a host. Should a type-B connector be detected, then the software loaded for handling the port is device mode. Currently the only device mode software on a Jetson is when it is in recovery mode. You could write software to make the Jetson look like mass storage for example, but this is not currently the case.
A camera “device” always accepts a type-B connector. The other end of the camera always goes to a type-A host.
The recovery mode cable is type-B. A camera at the other end would imply type-B at both ends…this isn’t allowed. Remember…the Jetson connector is not type-A, nor is it type-B…it is a universal OTG connector. It becomes a match to whichever type you put into it. Many stores sell a cable and only call it an “OTG” cable…there is no such thing, and almost all of those labeled “OTG” are really micro-B (which is great for mass storage devices like music players).
Notice on many adapters there is a small “A” or “B” on the end to indicate if it is type-A or type-B, but not all connectors are labeled.
I don’t know how this is wired to your Jetson, but if Jetson thinks the connector is type-B, then the connector essentially goes inert since device mode is only programmed in recovery mode. Host mode drivers unload in device mode.
FYI, despite having so many micro-OTG connectors sold on the market, you can purchase a purely type-A or a purely type-B micro-USB connector…they just aren’t as common.
