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You are here:TeensyCode LibraryUSB Keyboard |
Usb 2.0 3.0
| This code implements a USB keyboard, which you can use to control almost anyPC or Mac software.Download Source Files
Example ApplicationThe example program configures all Port B and Port D pins as inputswith pullup resistors. When any of these 16 pins is shorted toground, 2 keystrokes are sent to the PC naming that pin.An idle timeout is also implemented which send a spacebar keystrokeafter 8 seconds of inactivity.
Operating System SetupAll modern operating systems support USB keyboards. No special drivers needto be loaded.Sierra cache cleaner 11 1 5. This code also supports the keyboard 'boot protocol' for compatability withthe BIOS before an operating system has loaded. Simple Keypress Function#includeusb_keyboard_press(key, modifier)This simple function sends a single keypress. The following table listsdefinitions for the standard keys and modifiers. If no modifier is needed,use 0.
Complex Keyboard FunctionalityMost applications only require the single press function above, whichrapidly presses and releases a single key (plus modifiers) at a time.However,for multiple simultaneous keys pressed, holding keys down for periodsof time, and complex sequences, the raw USB key code data may be accessed.For example, to copy from the clipboard in Windows, some programs mayrequire the CTRL key to be held for a period of time before the C keyis pressed. Using usb_keyboard_press() presses and quickly releases theC and CTRL keys together at exactly the same instant. To send a timedsequence, you must set the keyboard state variables and use usb_keyboard_send()to transmit each state change. keyboard_keys[6]This 6 byte array represents the non-modifier keys that are currently pressed.You can only press 6 of the non-modifier keys at once.Set these to zero when not pressing a key.keyboard_modifier_keysThis variable represents the modifier keys currently pressed. Set this toa bitwise OR of all modifier keys pressed, or zero if none are pressed.usb_keyboard_send()After setting the varibles above, call this function to transmit thekey state to the PC. The PC automatically implements auto-repeat when yousend a key state that has a non-modifier key pressed,and you allow a long delay before sending a zero to release the key.keyboard_ledsThis variable is updated with the current keyboard LED setting.USB Connection Management Functionsusb_init()Initialize the USB controller. This must be called before anyothers, typically as your program initializes everything. Thisfunction always returns immediately and never waits for any USBcommunication.usb_configured()Is the USB controller configured?Returns 0 (false) if the host has not enumerated (auto-detected) andconfigured the USB controller. Returns non-zero (true) if configurationis complete. Many PC and Macintosh drivers are not immediately ready to transfer data,even after configuration is complete. Splayer simple and powerful 4 2 0. Psd cleaner 1 0 2 download free. An additional delay of 1 secondis generally a good idea to allow drivers to load on the PC beforeinitiating data transfers. USB Debug Message FunctionsThe debug version includes all thedebug message functions, which may beused indepentently from the keyboard functions for display inHID Listen.About USB Keyboard BandwidthThe USB keyboard protocol is not designed for high bandwidth data transfer.Each change of keyboard state is transmitted as a packet. Because theUSB interrupt transfer type is used, a maximum of 1000 packets per secondcan be sent.Using usb_keyboard_press(), two packets are sent for every keystroke, thefirst to press the key (and modifier keys) and the second to release. Thisresults in a maximum of 500 keystrokes per second.Using usb_keyboard_send(), a single packet is sent with the contents of thekeyboard_keys[6] and keyboard_modifier_keys. Software on the PC may spend considerable CPU time processing each keystroke,with the assumption that no human could possibly press more than several keysper second. Even 500 keys per second may overwhelm such software. |