ScmRTOS

What is scmRTOS?

scmRTOS stands for Single-Chip Microcontroller Real-Time Operating System.

scmRTOS is a free tiny preemptive Real-Time Operating System intended for use with Single-Chip Microcontrollers.

scmRTOS is capable to run on small uCs with as little amount of RAM as 512 bytes. The RTOS is written on C++. All source code is available.

Here's a list of supported platforms for now:

• MSP430 (Texas Instruments);
• AVR (Atmel);
• Blackfin (Analog Devices);
• ARM7:
  • AT91SAM7;
  • LPC2xxx;
  • ADuC70xx;
• Cortex-M3:
  • STM32F1XX;
  • STM32F2XX;
  • LPC17XX;
• Cortex-M4:
  • STM32F4XX;
• STM8 (STMicroelectronics).

---

Further reading:

• Learn more about scmRTOS;
• Check for specific port or release;
• Read documentation;
• Go directly to download section;

Project news

2012-Dec-03

Added Cortex-M4(F) GCC port and samples for STM32F4xx. See svn repository

2012-Apr-04

scmRTOS Version 4.00 released. See What's new in v4.00. Get it from download section or svn repository.

2012-Mar-28

scmRTOS Version 3.11 released. This is the bugfix and final release of v3.xx. See download section or svn repository.

2011-Apr-14

site Mediawiki engine updated.

2010-Apr-15

ARM7 GCC release - samples for LPC2xxx family added. See svn repository.

2010-Jan-27

scmRTOS Version 3.10 released. See What's new in v3.10.

2009-Dec

Site completely moved to wiki.

2009-Oct-01

Moving to wiki is almost done.

2009-Sep-24

Start moving context from site to this wiki.

2009-Sep-14

CortexM3 gcc port commited to svn repository

2009-Sep-01

bug 2848274 fixed in rev 220

2008-Dec-08

CortexM3 IAR port commited to svn repository

2008-Jun-19

scmRTOS Version 3.05 released. See What new in v3.05.

2007-May-13

scmRTOS Version 3.00 released. See What new in v3.00.

Small

Very small footprint:

• from 512 bytes of RAM
• from ~1K code

Fast

Minimal process switching latency:

• 900 ns on Cortex-M4 @ 168 MHz
• 1.8 us on Blackfin @ 200 MHz
• 2.7 us on Cortex-M3 @ 72 MHz
• 5 us on ARM7 @ 50 MHz
• 38-42 us on AVR @ 8 MHz
• 45-50 us on MSP430 @ 5 MHz
• 18-20 us on STM8 @ 16 MHz

Modern

Written entirely on C++:

• High reliability
• Simplicity and ease-of-use

Extensible

• Extensions mechanism at kernel level:
  • User defined extensions
  • Debug features