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Static keyboard_report_t keyboard_report // sent to PCĮvery time a new button is pressed, we send a report. What matters is, that the descriptor describes the following data structure that is used to send keypresses to PC: It’s omitted here for brevity, see the project zip for details. On the main.c side, the keyboard descriptor is needed. #define USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH 63 #define USB_CFG_INTERFACE_PROTOCOL 0x01 // Keyboard #define USB_CFG_INTERFACE_SUBCLASS 0x01 // Boot #define USB_CFG_INTERFACE_CLASS 0x03 // HID Here’s the overview of things you’ll probably need to change from my USB tutorial series: To make the operating system recognize our device as HID keyboard, we need to make mostly the same changes to usbconfig.h as we did in my mouse tutorial.
#USB SECURE TUTORIAL PASSWORD#
The bonus side is that these types of devices receive (at least on Windows, probably on Linux, not on OS X) keyboard LED state changes, so we can do cool things with our device, like I did in my USB password generator, where password generation is triggered by repeated CAPS LOCK presses.
#USB SECURE TUTORIAL FULL#
In this tutorial, I’m using a full “boot compliant HID” specification that can have up to six keys pressed down at a time. Note the cool breadboard header I have, there will be more posts about that one to follow soon! USB HID keyboard basicsĪ USB keyboard is a normal USB device, very much like a mouse, but it has an interrupt endpoint, which is used to send keyboard events to the host PC (instead of mouse movements).
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The ATtiny is using 20 MHz crystal, so if you’re following my USB tutorial series and have that circuit at hand, remember to change that frequency in usbconfig.c before trying this out. Here, I’m using ATtiny2313 with the LED wired to PB0 and switch to PB1. I already did a USB HID mouse post earlier, so you might want to check that out to understand a bit about HID descriptors and associated V-USB settings (in short, human interface devices send a binary descriptor to PC telling what kind of “reports” they send to the host on user activities).Īs a basic setup, you’ll need a working V-USB circuit with one switch and one LED attached. There still seems to be a lot of traffic to my V-USB tutorials, so I thought I’d write a short follow-up post on USB keyboards.