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ISO 9001 certified

ARM7/9/XScale & Cortex-A/R, Rowley

embOS for ARM7/9/XScale & Cortex-A/R was developed for and with Rowley compiler and supports all memory models offered by this compiler. It comes with an easy to use start workspace and start project for Rowley's CrossStudio V3.6.3. Software development with J-Link is possible.


Pricing Trial download Notification Subscribe to embOS software notification Release Notes


Resources and performance data

Memory usage
Kernel size (ROM) Approx. 1500 bytes
Kernel RAM usage 71 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) 44 bytes
Context switch time Max. 8 µs, independent of number of tasks
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 Unlimited
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 LH79531 CPU running at 48MHz.


Board support packages

embOS comes with lots of ready to go start projects and support packages for various ARM7/9 CPUs and starterboards.

CPU Eval board
Atmel AT91SAM7S64 Atmel AT91SAM7S64-EK
Atmel AT91SAM7S256 Atmel AT91SAM7S256-EK
Atmel AT91SAM7SE512 Atmel AT91SAM7SE-EK
Atmel AT91SAM7X256 Atmel AT91SAM7X256-EK
Atmel AT91SAM9263 Atmel AT91SAM9263-EK
NXP LPC2468 Embedded Artists LPC2468
Renesas RS7S721001 Renesas RSK2+RZA1H