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anykey sdk
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Contents of this directory

This directory contains the following items:

  • pressanykey: The pressanykey runtime for the LPC1343 / board, linker script and makefile
  • checksum: A tool to calculate and adjust the checksum of a firmware file
  • several example projects (see below for descriptions)

In contrast to other runtimes, pressanykey does not link against precompiled libraries. Instead, the runtime is included into projects as source code. The projects compile in a few seconds and linking is static anyway, so there's no need for precompiled libraries. You always have the full source at your fingertips - less magic, more control.

The makefile is designed to compile and link all .c files in your project directory and subirectories, so there's no need to modify it for new source files. Just make sure you don't have unused .c files in your project directory.

We're currently building up the firmware utilities, so not all peripherals are working yet.

Build environment

For developing and building Anykey software, you will need:

  • a computer and a text editor of your choice
  • gcc arm-none-eabi toolchain (see below)
  • gnu make
  • checksum tool (go to checksum directory, build checksum tool (make))

For compiling the checksum tool, you might also need a gcc for your development computer.

Make sure that the toolchain's tools, make and checksum are found by your terminal (adjust $PATH so that they can be found).

Alternatively, the examples can be built with clang/llvm (experimental - more info coming).

Setting up a project

Either copy an existing example directory (using cp -R) or do the following steps to create a project directory from scratch:

  • create a project directory
  • create a main.c file (the name doesn't actually matter)
  • to use pressanykey firmware library, #include "pressanykey/pressanykey.h"
  • link, symlink or copy pressanykey directory to project directory
  • link, symlink or copy makefile (inside pressanykey dir) to project directory
  • link, symlink or copy lpc1343.ld (inside pressanykey dir) to project directory
  • run make (will compile and link all c files in project dir and subdirs)
  • connect target board in USB programming mode (Anykey V1: Short-circuit the programming pins while connecting the USB cable, Anykey V2: Hold the application button while pressing the reset button)
  • run make mac-install (optionally copy the resulting .bin file manually)
  • Reset the board (Anykey V1: disconnect and re-plug, Anykey V2: press the reset button)

In most cases, symlinking (or hard-linking, if you prefer) the pressanykey directory, makefile and linker script from your project directory to the pressanykey directory is recommended. This way, the project refers to the original, unaltered runtime library.

The build system should work in OSX without modifications. For other *NIX platforms, please adjust the target board path and unmount command for the makefile ("mac-install" target).

Linux' FAT drivers apparently interfere with copying, you need to transfer the files directly onto the block device (after unmounting the USB mass storage device in case it got mounted automatically by udev, this will typically be mounted under /media/NO\ CRP):

dd if=firmware.bin of=/dev/<wherever the ANYKEY appears> seek=4

Alternatively, you can use the simpleflash python script from the r0ket project:


This kit contains some examples. Here's a short overview, from basic to advanced:


The embedded "Hello World": A blinking LED. Timing is done using busy wait. One of the simplest possible applications. Shows writing digital output pins.


The LED lights up when the button is pressed. Shows reading digital input from pins and configuring pullup/pulldown resistors for inputs.


A smoothly pulsing LED. The LED is dimmed and animated using PWM (pulse width modulation) in the systick timer. Shows how to use the systick timer.


Same as smooth, but using a 16 bit timer instead of systick. This example should be updated to use timer-based PWM instead of software.


Generates a VGA signal with eight vertical color bars. To use this example, a VGA connector and three resistors are required (schematics can be found in the main.c file). The example shows inline assembly.


Generates a VGA signal with text (800 x 600 @ 56Hz). To use this example, a VGA connector and three resistors are required (schematics identical to colorbars example). The example shows some advanced inline assembly strategies.


This example uses the software USB stack to implement a raw USB device. The device does not have any functionality other than the required standard USB functionality for USB enumeration.


Implements a simple USB HID keyboard. The example includes a two-step abstraction: hid.c implements a HID device based on the USB software stack. keyboard.c builds a keyboard on top of the HID device functionality. The keyboard can write text and the LED will act as a caps lock key (note that not all OSes synchronize caps lock among multiple keyboards). This example may be useful as a base for implementing your own HID devices.


A HID-keyboard implementation of Nerd Pursuit - see Play it on a standard *NIX shell.


Illustrates I2C communication. Also contains functionality to use the API in a blocking fashion (the API itself is non-blocking, using a callback on completion). This example uses an ams TCS3471 RGB color senor chip attached to the I2C bus.

Installing the compiler

Please see Setting up the Toolchain on our Wiki.

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