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ISO 9001 certified

ARM7/9, ARM ADS toolkit

embOS for ARM7 / ARM9 / XScale was developed for and with ARMs ADS toolkit 1.2 and supports all memory models offered by this compiler. It comes with easy to use start projects.


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Resources and performance data

Memory usage
Kernel size (ROM) Approx. 3000 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) 56 bytes
Context switch time Max. 7.2 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 ARM CPUs and starterboards.

CPU Eval board
Atmel AT91M40xxx Atmel AT91M40xxx
Atmel AT91M55800 Atmel AT91EB55
Atmel AT91SAM7A3 Atmel AT91SAM7A3-EK
Atmel AT91SAM7S64 Atmel AT91SAM7S64-EK
Atmel AT91SAM7S256 Atmel AT91SAM7S256-EK
Motorola DragonBall MX1 Motorola DragonBall MX1 evalboard
Cirrus Logic EP7312 Cirrus Logic EP7312 evalboard
OKI 6200 OKI 6200 evalboard