embOS for Cortex M was developed for and with GNU compiler version 4.4.1 and supports all memory models offered by these compiler. It comes with easy to use make files. Initilization code for different Cortex M starter boards is included. Software development with with JTAG tools like J-Link ARM is possible.

Resources and performance data

Memory usage
Kernel size (ROM)	approx. 1700 bytes
Kernel RAM usage	51 bytes
RAM usage per task control block	36 bytes
RAM usage per resource semaphore	16 bytes
RAM usage per counting semaphore	8 bytes
RAM usage per mailbox	24 bytes
RAM usage per software timer	20 bytes
RAM usage event	0 bytes
Min. stack-size per task (RAM)	72 bytes
Timing
Context switch time	8.0 usec
Interrupt latency time	zero
Kernel CPU usage/TICK	less than .2% of total calculation time at 1000 Interrupts/second (1ms TICK)
Basic time unit (TICK)	typ. 1 ms, min. 20 µs (50 kHz interrupt frequency)
Features
Max. no. of tasks	Unlimited (by available RAM only)
Max. no. of mailboxes	unlimited (by available RAM only)
Max. no. of semaphores (resource/binary/counting)	unlimited (by available RAM only)
Max. no. of software timers	unlimited (by available RAM only)
Max. no. of priorities	255
Stack size idle task (RAM)	0(no memory needed)
Nested interrupts	permitted
Task switches from within ISR	possible

Absolute values given above were measured with embOS release build on an ST SMT32F10 CPU running at 72MHz.

embOSView offers system analysis during runtime

Available Emulators

• J-Link ARM
• ARM

Board support packages

embOS comes with lots of ready to go start projects and support packages for various Cortex M CPUs and starterboards.

CPU	Eval board
NXP LPC1768FBD100	Keil MCB1760
ST STM32F103ZET6	ST STM3210E-EVAL(MB672)

 

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Release notes embOS CM3 for GNU tools 3.80i

1. Tool chain used for build
2. New features
3. Improvements
4. Program corrections
5. Known problems/limitations
6. Release history
7. Miscellaneous

Tool chain used for build

The following tools have been used:

Compiler:  arm-elf-gcc 4.4.1
Assembler: arm-elf-as 2.19.1
Librarian: arm-elf-ld 2.19.1

New features

Version 3.80i

1. Initial version for Cortex M3

Improvements

Version 3.80i

1. NONE, initial version for Cortex M3.

Program corrections

Version 3.80i

1. NONE, initial version for Cortex M3.

Known problems/limitations

Version 3.80i

1. NONE.

Release history

Version	Release date	Short explanation
V3.80i	24. August 2008	Initial version for Cortex M3

Miscellaneous

This document was first released with version 3.80i of the software.
Software released earlier is documented internally. This information is available at request.