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ISO 9001 certified


embOS for ST7 was developed for and with COSMIC's CXST7 compiler and supports the long stacked memory model offered by this compiler. It comes with easy to use start projects for COSMIC's IdeaST7 embedded workbench. Software development with debugger or ZAP simulator is supported.


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Resources and performance data

Memory usage
Kernel size (ROM) Approx. 2000 bytes
Kernel RAM usage 27 bytes
RAM usage per task control block 17 bytes
RAM usage per resource semaphore 4 bytes
RAM usage per counting semaphore 2 bytes
RAM usage per mailbox 11 bytes
RAM usage per software timer 9 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 45 bytes
Context switch time 208 µs
Interrupt latency time 49.5 µs
Kernel CPU usage/TICK Less than 1% of total calculation time at 1000 interrupts/second (1ms TICK)
Basic time unit (TICK) Typ. 1 ms, min. 100 µs (10 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 255
Stack size idle task (RAM) 0 (no memory needed)
Nested interrupts Not supported
Task switches from within ISR Possible

Absolute timings given above were measured with embOS release build on an ST72F521 CPU running at 8MHz.
Note that task switch time depends on stack usage of a task.