embOS for Cortex M3 CPUs and IAR compiler

embOS for Cortex M3 was developed for and with IAR's compiler version 4.42A and V5.11 and supports all memory models offered by these compilers. It comes with easy to use start projects for IAR's embedded workbench. Initilization code for different Cortex M3 starter boards is included. Software development with C-SPY simulator or C-SPY debugger 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	8 bytes
RAM usage per counting semaphore	2 bytes
RAM usage per mailbox	20 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	TBD
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 Luminary LM3S811 CPU running at 6MHz.

embOSView offers system analysis during runtime

embOSView with ARM7 target CPU

embOS plugin for IAR Workbench

The new embOS Plugin for IAR Workbench allows embOS system analysis during debug sessions. The plugin shows system state, tasks, mailboxes, semaphores and software timer.

Debug session using CSpy with embOS plugin

Available Emulators

J-Link ARM
ARM

Additional information

Release Notes embOS CM3 for IAR compiler V4.42
Release Notes embOS CM3 for IAR compiler V5.1x
IAR Web site for additional compiler info / support