Cortex M3, Rowley

embOS for Cortex M3 was developed for and with Rowley's compiler and supports all memory models offered by this compiler. It comes with easy to use start projects for Rowley's Crossworks for ARM workbench. Initilization code for different Cortex M3 starter boards is included. Software development 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	32 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	8.2 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 STM32F10X CPU running at 72MHz.

embOSView offers system analysis during runtime

Available Emulators

• J-Link ARM
• ARM

Additional information

Rowley Web site for additional compiler info / support

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Release notes

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:    GCC version 4.1.1
Assembler:   GCC version 2.17
Librarian:   GCC version 2.17
Workbench:   Rowley Crossworks for ARM V1.7

New features

Version 3.62c

1. First versiom

Improvements

Version 3.62c

1. First versiom

Program corrections

Version 3.62c

1. First versiom

Known problems/limitations

Version 3.62c

1. NONE.

Release history

Version	Release date	Short explanation
V3.62c	11. Nov 2008	Initial version for Cortex M3

Miscellaneous

This document was first released with version 3.62c of the software.
Software released earlier is documented internally. This information is available at request.