![]() I was only once playing with HID keyboard emulation on AVR using V-USB. You may try to set the subclass in all usages of the D_INTERFACE macro from file USBCore.h to 0x01. In source files, as you have pointed out, sub class is set to 0x00 everywhere. I might be mistaken, but if you want your device to be recognized during boot, its bInterfaceSubClass should be 0x01 (boot device subclass). How could I get this Leonardo recognized by a BIOS as a generic keyboard? =>HID DescriptorEndpoint Descriptor Direction: IN - EndpointID: 4 =>Interface Descriptor HID Interface Class =>Interface Descriptor This is a CDC Data USB Device Interface Class =>Descriptor Hex DumpEndpoint Descriptor Direction: IN - EndpointID: 1 =>Descriptor Hex Dump This is a Communications (CDC Control) USB Device Interface Class > This is a Communications (CDC Control) USB Device Interface Class =>Interface Descriptor This is Communications (CDC Control) USB Device Interface ClassĬAUTION: This may be an invalid bInterfaceProtocol =>IAD Descriptor This is Communications (CDC Control) USB Device Interface Class =>Device DescriptorConfiguration Descriptor Validated =>Endpoint Descriptor Direction: IN - EndpointID: 4 =>Endpoint Descriptor Direction: IN - EndpointID: 3 =>Endpoint Descriptor Direction: OUT - EndpointID: 2 =>Endpoint Descriptor Direction: IN - EndpointID: 1īmAttributes: 0x03 -> Interrupt Transfer Type =>Device Information Device Bus Speed: Full The following is a dump from USB Device Viewer for the Leonardo: : USB Composite Device Arduino_Installation\hardware\arduino\cores\arduino\USBCore.cpp.Arduino_Installation\hardware\arduino\cores\arduino\USBCore.h.Arduino_Installation\hardware\arduino\cores\arduino\USBDesc.h.Arduino_Installation\hardware\arduino\cores\arduino\HID.cpp.The source code for the USB descriptors/configuration is available to be edited and is located at: The modifications I've made haven't helped, and I suspect it is because the Leonardo is a composite device which exposes the serial communication, keyboard emulation, and mouse emulation on the same USB port. I have been making modifications to the USB device descriptor of the Leonardo, trying to make it match a Dell L100 as much as possible. The targeted environment is running DOS so to my knowledge I need to get the Arduino Leonardo recognized by the BIOS on this machine, which it is not and it does not type the 'A' in DOS. It is recognized as a generic HID keyboard and will type an 'A' every five seconds. Now this example works great on my Windows XP machine. Keyboard.write('A') // Write an A using keyboard emulator The loop routine runs over and over again forever:ĭigitalWrite(led, HIGH) // Turn the LED on (HIGH is the voltage level)ĭigitalWrite(led, LOW) // Turn the LED off by making the voltage LOW ![]() Initialize the digital pin as an output. The setup routine runs once when you press reset: Pin 13 has an LED connected on most Arduino boards. I have been playing with the Leonardo and wrote a very simple sketch based off the Blink example. This allows the board to appear to be a connected computer that can be operated by a mouse and keyboard, in addition to a virtual (CDC) serial / COM port.I am trying to use an Arduino Leonardo for keyboard emulation since that is one of its advertised features. It contains everything that is required to support the micro-controller’s operation and connects it to a PC with a USB cable / power it up with an AC-DC adapter / battery to get started.Īll above boards Arduino Leonardo is different however the ATmega32u4 has a built-in USB communication process, eliminating the need for a secondary processor. It has a total of 20 digital I/O pins (of which seven could be used as PWM outputs and 12 for analog input purposes), a 16-MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. The Arduino Leonardo is based on the ATmega32u4 micro-controller board.
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