embOS for ARM7 / ARM9 CPUs and KEIL MDK

embOS for ARM7 / ARM9 was developed for and with KEIL MDK, compiler RVCT3.0 and supports all memory models offered by this compiler. It comes with easy to use start projects for the KEIL uVision. Initilization code for various ARM CPUs is included. Software development with uVision simulator or debugger with JTAG tools like J-Link ARM ATMEL SAM-ICE or ULINK is possible.

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
Timing
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)
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.

embOSView offers system analysis during runtime

embOSView with ARM7 target CPU

Target CPU specific information

embOS comes with ready to go start projects and support packages for various ARM CPUs and starterboards.

ATMEL AT91SAM7A3 CPUs supported by embOS
ATMEL AT91SAM7S CPUs supported by embOS
NXP LPC2xxx CPUs supported by embOS
STMicroelectronics STR71x CPUs supported by embOS

Available Emulators

J-Link ARM
ARM
KEIL ULINK

Additional information

Release Notes embOS ARM for KEIL MDK