usbpassthru's Introduction

USBPassThru

Arduino USB pass through demos

All the demos use one of following hardware configurations.

Arduino Leonardo + Arduino USB Host Shield
Adafruit ItsyBitsy 32u4 @ 8 MHz and 3.3V + USB Host Shield mini

The demos do not decode the USB HID reports. They pass the HID reports from the USB host shield unchanged to the USB device output.

Understanding pass through is required for keyboard/mouse extenders or IP KVMs.

Other uses are to make a hardware key macro that work on any OS. No need to install key macro software.

Swap certain keys such as Caps Lock and Ctrl keys.

Swap the mouse left and right buttons.

USBKbdPassThru

USB Keyboard -> USB Host Shield -> Leonardo -> Computer USB port

USBMsePassThru

USB Mouse -> USB Host Shield -> Leonardo -> Computer USB port

Alternative hardware option

A smaller and cheaper option is to use an Adafruit ItsyBitsy 32u4 @ 8 MHz and 3.3V logic levels. The 32u4 is the same microcontroller used in the Arduino Leonardo. And a USB Host mini board. The UH mini uses 3.3V logic levels so the 32u4 board must also use 3.3V. Soldering and cutting traces is required.

https://www.circuitsathome.com/arduino_usb_host_shield_projects/

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Sorry for maybe putting an issue but i didnt find any other way to get in contact with you, i have used your libraries a lot and also the codes, thank you. Now i am wondering if there is anyway to get pass thru on the newer SAMD usb host library?

Example for passthrough of a composite device?

Have a composite device here, Mouse report ID 0, Keyboard 1(with several other reports) Below an example of the HID report descriptor

How would you initialize a composite device? Like this?

HIDBoot < USB_HID_PROTOCOL_KEYBOARD | USB_HID_PROTOCOL_MOUSE > HidComposite(&Usb);
HIDBoot<USB_HID_PROTOCOL_KEYBOARD>    HidKeyboard(&Usb);  // Is this needed with composite init above??
HIDBoot<USB_HID_PROTOCOL_MOUSE>    HidMouse(&Usb); // Is this needed with composite init above?

KbdRptParser KbdPrs;
MouseRptParser MousePrs;

void setup()
{
  Serial.begin( 115200 );
  uint8_t attempts = 30;
  while (!Serial && attempts--) {
    delay(100); // Wait for serial port to connect for up to 3 seconds
  }
  Serial.println("Start");

  if (Usb.Init() == -1) {
    Serial.println("USB host shield did not start.");
  }
  delay( 200 );

  HidComposite.SetReportParser(1, &KbdPrs);
  HidComposite.SetReportParser(0, &MousePrs);
  HidKeyboard.SetReportParser(1, &KbdPrs);  // needed if using HidComposite?
  HidMouse.SetReportParser(0, &MousePrs);  // needed if using HidComposite?

  // begin both? or should I used another library for composites?
  Keyboard.begin(); 
  Mouse.begin();
}

HID data modify demo

Would you consider adding a demo showing how to modify certain things regarding an USB mouse? Such as it's hardware ID and etc.

Could you also provide a wiring for USB host shield to Leonardo Pro Mini?

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usbpassthru's Introduction

USBPassThru

USBKbdPassThru

USBMsePassThru

Alternative hardware option

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Example for passthrough of a composite device?

HID data modify demo

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