USB CDC-ACM uart like controlled USB Hub:

• 1.5A fuse;
• Power switch with overcurrent, undervoltage and overtemperature protection;
• ESD Protection diodes on the USB lines;

• WebBle
• Web flasher, like: https://esphome.github.io/esp-web-tools/ (does it work over CDC?)
• Get a PID from https://pid.codes/howto/ (only found how to change TinyUSB PID)
• There is some overflow around the help print for the hub_settings
• 3D printed case
• sdkconfig.default for release with CDC (no jtag)

I needed something to remotely disconnect and reconnect an USB device from my workstation, aka managed USB hub, the commercially available options where either expensive or needed drivers. So the idea here is an device that does not need external power and works as a USB CDC-ACM and one can simply send hub_ports_off over the terminal to turns the USB ports off.

As per USB-C standard, if you are bored read section 4.6.2.1, an USB-C source device should at least source 1.5A, as it is written:

All exposed USB Type-C Current ports shall have the ability to offer the same power capabilities.

• All ports shall initially offer 1.5 A.

With that being said we can use the HUB with USB2.0 devices (500mA) with no problems. The device monitor the CC pins and it can detect if the source is able to provide the minimum required current (1.5A):

Table 4-36 indicates that a minimum of 0.7V should be read on CC for a 1.5A capable source, so we should be good with a USB-C to USB-C cable.

If you have an old laptop like me and it does not have an USB-C port, one can override the source check and send hub_setings override_cc 1 and the HUB ports will be enabled even if the source does not provide enough power. On that case you may experience some weirdness on the final USB device, but hey, if you are here, you should have some idea of what you are doing.

One can also issue hub_status and see what the status is, for example:

dirty_usb_disconnect> hub_status
FW version: v0.0.1a
Hub is: Enabled
Fault: None
USB Host does not provide 1.5A

The CDC-ACM USB driver is based on espressif example, you will find how it works there... the PID is 0x303A and VID is 0x0009. In case you are building the debug version the output will be over the USB-JTAG controller, PID:VID 0x303A:0x1001 (here you can also debug over USB, cool 😄)

• Type help on the terminal

• Blue - idle, ports off;
• Green - ports on;
• Red - fault;

• 1.5A fuse;
• TPS2065C: 1A load, 86mΩ USB power switch with overcurrent, undervoltage and overtemperature protection;
• Device itself draws ~40mA;

• On the boards I made I changed all the resistors to 5.1KOhms for simplicity, the schematic did not update;
• Jumper 1 allows to use the HUB without crystal, saving 0.05USD 😄;
• Jumper 2 and 3 changes the ADC to channel 2 as the channel 1 has a boot glitch (it should be ok). Bear in mind that ADC2 does not work with WiFi (rtfm);

• The hub controller datasheet indicates a internal pullup on RST, but it seems something is going on there, so next revision needs an external pull up, for now:

  dude-dirty-usb-disconnect/components/app_hub_control/app_hub_control.c

  Line 406 in 4d217c8

  gpio_set_level(HUB_RST, ON);

• Some 3D models from: www.3dcontentcentral.com