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Cortex-A/R, CodeSourcery

embOS for Cortex-A/R was developed for and with CodeSourcery compiler and supports all memory models offered by these compilers. It comes with easy to use start projects for CodeSourcery  Codebench IDE. Initilization code for different Cortex A8 starter boards is included.


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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
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)
Max. no. of tasks Unlimited (by available RAM only)
Max. no. of mailboxes unlimited (by available RAM only)
Max. no. of semaphores unlimited (by available RAM only)
Max. no. of software timers unlimited (by available RAM only)
Max. no. of priorities 64
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 TI OMAP3503 CPU running at 600MHz.

Board support packages

embOS comes with lots of ready to go start projects and support packages for various Cortex A8 CPUs and starterboards.

CPU Eval board
TI AM3517 LogicPD Zoom AM3517 EVM