Detecting USB Disconnection

[Mostez]

What is the method for detecting USB device disconnection from USB#0 on an ESP32 WROOM with library version 0.1.4?
TIA

[tobozo]

hi,

very good idea, thanks for suggesting this 👍

I have pushed some changes on the main branch, you can now create a callback:

void onDisconnect( uint8_t usbid )
{
  Serial.printlf("Device on USB#%d was unplugged\n", usbid);
}

and attach that callback from your setup(), before calling USH.init():

void setup()
{
    // ...
    USH.setOndisconnectCb( onDisconnect );
    // ...
}

I'll create a release soon for arduino registry, but this is already available in platformio registry (v1.5.0)

[Mostez]

Hi, sorry for the delayed response, I was out of the office. Thank you so much for this update. I'll try it right away. 🙏

EDIT:
Hi, I tried running the code on an ESP32-WROOM using Arduino IDE 1.8.12, but the callback function isn't being triggered!

void onDisconnect( uint8_t usbid ) // not triggered
{
 Serial.printf("Device on USB#%d was unplugged\n", usbid);
}

void setup()
{
  ....
  USH.setOndisconnectCb( onDisconnect );
  USH.init( USB_Pins_Config, my_USB_DetectCB, my_USB_PrintCB );
  
}

I've only received a response from the default callback function:
USB#0 disconnected

void Default_USB_DisconnectCB( uint8_t usbNum )
{
  printf("USB#%d disconnected\n", usbNum);
}

[tobozo]

Thanks for your feedback 👍

My bad, I'll fix USB.init() so that it does not overwrite the callback previously set with USH.setOndisconnectCb()

That being said, it actually works when the callback is attached from USH.init() as the fifth argument:

void setup()
{
  ....
  USH.init( USB_Pins_Config, my_USB_DetectCB, my_USB_PrintCB, nullptr, onDisconnect);
}