Goals

This tutorial show how a really simple application linked with the MutekH operating system can expose a file system to the user through an interactive shell interface using the lua scripting language.

Description of the hardware platform

The demo platform uses

• A Mips32 processor and its cache, running the embedded software
• A Ram component, containing the code and live variables
• A TTY controller, displaying messages
• A Block-device, emulating access to a real mass-storage peripheral
• A Timer controller
• A VCI interconnect, connecting the above components altogether

MutekH overview

MutekH is a portable operating system for embedded platforms. MutekH is a set of libraries built on top of the Hexo exo-kernel. The exo-kernel can be seen as an Hardware Abstration Layer (HAL) used to address platform and processors specific implementations. MutekH is fully configurable to match every application needs.

Hexo currently support these platforms:

• Soclib platform with Mips and Ppc multi-processors support
• Pc platform with x86 multi-processors support
• Unix process (kernel and application run as standalone unix process)

Several modules are available:

• Standard C library (libc)
• Native Posix threads Support (libpthread)
• TPC/IP stack networking library (libnetwork)
• File system support library (libvfs) along with file system drivers
• MutekS (libsrl), static OS for DSX
• Device drivers for various peripherals
• Lua scripting library (liblua)
• Terminal driving library (libtermui)

The application

This demonstration application use the VFS module along with a block device driver to gain access to the FAT file system.

The lua scripting library is used as the shell language and the terminal driver library provides a readline interface with completion and history to the end user.

Compiling an application with the MutekH operating system is pretty simple. A guide is available online at http://www.mutekh.org/ .

Running the simulator

Running the command ./simulation.x will launch the simulator. The TTY with interactive lua shell will appear.

Usage

Once the demonstration has been started on the soclib simulation, the lua shell prompt is displayed and the user can enter on of the following commands:

• ls(): display a list of files in the current directory.
• pwd(): display the name of the current directory.
• cat("file.txt"): display content of the given text file.
• cd("directory"): change current directory.

Output