Just Imagine....

...it were so easy and efficient to develop embedded Ethernet/Internet projects.
As easy as developing normal PC software...

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- µTasker MODBUS module
(serial/TCPmaster/slave/gateway)
Full details here



- µTasker V1.4 for STM32:
Newest release V1.4.2 on 9th March 2014

- µTasker V1.4 for KINETIS:
Newest release V1.4.4 on 16th April 2014
Full details of Kinetis support here




But why just imagine when it already can be so? The µTasker is the key.

Its easy to use, fully supported and enables you to get your own project up and running faster than you thought possible. With 'out-of-the-box' complete project support even developers new to Ethernet/Internet and USB technology can get a project up and running in an afternoon. The µTasker is an operating system with TCP/IP stack and USB support as well as drivers for various Internet/USB enabled single-chip microcontrollers. It has its own unique device simulator allowing large parts of, when not complete, projects to be developed and tested on a PC. The simulated device is contactable by other PCs or devices on the network, enabling the most efficient embedded development environment imaginable.

But why imagine? The µTasker can also be your key to success.


Features - what the µTasker project has to offer

  • Small footprint - The µTasker solution is especially suited to projects where an easy to use, slim-line operating system and TCP/IP and/or USB stack are of importance. This makes it ideal for single chip applications where the control of resources is critical but a high level of developer/user comfort can't be compromised.
  • µTasker operating system - efficient and easy to use operating system to enable very modular and manageable software. Inter-task queues with flexible timer support. Supports distributed processing features over an integrated fast Ethernet network protocol.
  • µFileSystem and µParameterSystem - Highly efficient internal or SPI FLASH based file system support, optimised for typical embedded applications.
  • µtFAT - FAT16/32 compatible file system with SD card interface support, optionally integrated into FTP and HTTP servers supporting LFN (long file names) and optional data caching. Operates in NAND Flash (Disk C), SD cards (Disk D) and/or USB memory sticks (Disk E)*.
  • User Files support - Allows embedded files in code to be used or mixed with µFileSystem files, including utility for creating an embedded set of user files for simple upload to targets.
  • Device drivers - UARTs (interrupt, DMA, RS485), I2C, CAN, character LCD, graphical LCD and TFT, Matrix keyboard, ADC, DAC, RTC, PWM, HW timers, port interrupts.
  • USB device/host*/OTG* support - CDC, MSD, HMI classes, user friendly configuration and interfacing, with buffered streaming mode as well as firmware upload capability.
  • Special support - DMA library routines (Kinetis, M5223X - uMemcpy, uMemset), Low power task.
  • TCP/IP stack - ARP, RARP, ICMP, IPv4/IPv6, UDP, DHCP, DNS, TFTP, TCP, dynamic HTTP, HTTP post, FTP, SNMP V1/V2c*, Multicast with IGMP V1/V2, SMTP, POP3, TELNET, NetBIOS and VLAN plus various useful utilities for real-world Internet work. Multiple interface, network and VLAN capable. Integrated with the µTasker operating system for optimal performance.
  • Graphical LCD support - µGLCDLib and graphical LCD simulator.
  • Boot Loader - The µTasker project has integrated support for the "Bare-Minimum" boot loader which enables complete and secure software uploads via Ethernet/Internet (FTP and HTTP POST) as well as USB, and occupies less than 2k of FLASH space! Optionally it allows uploads to external SPI FLASH as well as encryption.
  • Serial Boot Loader - The µTasker project includes a stand-alone boot loader allowing deleting and loading new applications over a UART, from an SD-card or a memory stick*, as USB-MSD device or via web server.
  • Unique µTasker simulator - allows the supported devices and peripherals to be simulated in "real-time" on the PC which can dramatically reduce development times compared to classical development/debug methods on the target.
  • Ready-to-run with pre-configured projects - The µTasker project is delivered with setups for GCC make file building, IAR, Keil uVision, Rowley CrossWorks, CodeWarrior, Atollic and Atmel Studio 6*. The µTasker project is a high quality demonstration project designed to be used as base for professional work.
* Some features are restricted to certain processor packages or are presently available only as Beta versions. Development system support is restricted in some cases to devices from certain chip manufacturers.
Please contact us for latest information or advice on choosing the most suitable processor for your project.

µTasker Industrial Extension Modules

  • MODBUS - The µTasker MODBUS extension is a drop-in software module which adds flexible MODBUS functionality to your project.
    • MODBUS serial RTU/ASCII
    • RS485 control
    • MODBUS TCP
    • flexible bridge, gateway and routing functions
    • Multiple masters and slaves

  • Get full details of the µTasker MODBUS module here.

Supported Processors

The following list is organised according to the present popularity of use of the µTasker project on the devices:
  • Top ranking
  • Medium ranking
    • ATMELTM AVR32 - 32 bit AVR [UC3A, UC3B and UC3C] with up to 64k SRAM and up to 512k FLASH, integrated 10/100M Ethernet controller (external PHY) and USB host/device/OTG: 66MHz 1.3mW/MHz. Project details here
    • ATMELTM AT91SAM7X / ATMELTM AT91SAM7S - 32 bit ARM7 with up to 128k SRAM and up to 512k FLASH, integrated 10/100M Ethernet controller (external PHY) and USB device
    • NXPTM LPC2XXX - 32 bit ARM7 with up to 58k SRAM and up to 512k FLASH, integrated 10/100M Ethernet controller (external PHY) and USB. Supports LPC24XX, LPC23XX and LPC2101..LPC2106 devices
    • Luminary MicroTM LM3SXXXX - 32 bit Cortex TM M3 with up to 64k SRAM and up to 256k FLASH, integrated 10/100M Ethernet controller and PHY with auto cross-over

  • Legacy - not recommended for new designs
    • FreescaleTM MC9S12NE64 - 16 bit HC12 single chip with 8k SRAM and 64k FLASH, integrated 10/100M Ethernet controller and PHY
    • STTM STR9 - 32 bit ARM9 with up to 96k SRAM and up to 544k FLASH, integrated 10/100M Ethernet controller (external PHY). Including STR910, STR911 and STR912 devices

Note that specifications may change as the device manufacturers extend their present product ranges

Further Questions and Contact Details

Should you have specific questions which are not answered on the web site you are welcome to contact us by email at the following addresses:

  • For general enquiries -
  • For licensing questions -
  • For technical support for the FreescaleTM Kinetis family -
  • For technical support for the FreescaleTM M522XX family -
  • For technical support for the ATMELTM AT91SAM7X family -
  • For technical support for the ATMELTM AVR32 family -
  • For technical support for the NXPTM LPC2XXX and LPC17XX family -
  • For technical support for the Luminary MicroTM LM3Sxxxx family -
  • For technical support for the ST MicroTM STM32 family -


The µTasker project is a project/product of the company M.J.Butcher Consulting, located in Switzerland. Further details can be found at the web site of M.J.Butcher Consulting.
For a brief history of the µTasker project please see
this page.



Welcome to the homepage of the µTasker operating system with integrated TCP/IP stack and target device simulator.
Copyright (c) 2014 M.J.Butcher Consulting