You are viewing an older revision! See the latest version

USBKeyboard

Table of Contents

  1. Hello World
  2. API
  3. More examples
  4. Related

Beta only!

This library is in beta, and only works with the betamode compiler and the beta libraries.

To use these, ensure you have enabled /betamode for the compiler, and that you import these examples as the basis for your experiments to ensure the beta mbed library is pulled in.

The USBKeyboard interface is used to emulate a keyboard over the USB port. You can send basic keys, keys with modifiers (CTRL + 's'), function keys and media keys

USB pins are available on p31 (D+) and p32 (D-)

Hello World

#include "mbed.h"
#include "USBKeyboard.h"

USBKeyboard keyboard;

int main(void) {
    while (1) {
        keyboard.mediaControl(KEY_VOLUME_DOWN);
        keyboard.printf("Hello World from Mbed\r\n");
        wait(1);
    }
}

Import programUSBKeyboard_HelloWorld

USBKeyboard Hello World

Last commit 01 Mar 2013 by Samuel Mokrani

API

[Not converted]

More examples

Program which controls sound and tracks of your playlist with switches:

#include "mbed.h"
#include "USBKeyboard.h"

USBKeyboard keyboard;

//Bus of buttons
BusInOut buttons(p21, p22, p23, p24, p25, p26, p29);

int main(void) {
    uint8_t p_bus = 0;

    while (1) {
        //if the bus of buttons has changed, send a report
        if (buttons.read() != p_bus) {
            p_bus = buttons.read();
            if(p_bus & 0x01)
               keyboard.mediaControl(KEY_MUTE);
            if(p_bus & 0x02)
               keyboard.mediaControl(KEY_VOLUME_DOWN);
            if(p_bus & 0x04)
               keyboard.mediaControl(KEY_VOLUME_UP);
            if(p_bus & 0x08)
               keyboard.mediaControl(KEY_NEXT_TRACK);
            if(p_bus & 0x10)
               keyboard.mediaControl(KEY_PLAY_PAUSE);
            if(p_bus & 0x20)
               keyboard.mediaControl(KEY_PREVIOUS_TRACK);
            if(p_bus & 0x40)
               keyboard.printf("Hello World\r\n");
        }
        wait(0.01);
    }
}

Import programUSBKeyboard_mediaKeys

USBKeyboard example with media keys

Last commit 01 Mar 2013 by Samuel Mokrani

USBHID
USBMouse
USBMouseKeyboard

All wikipages