embOS for ARM7 / ARM9 CPUs and GNU tools

embOS for ARM7 / ARM9 was developed for and with GNU tools. It comes with easy to use make file for GNU tools and batch file for GDB debugger.
You can use any GNU toolchain, but we recommend the Yagarto toolchain (www.yagarto.de).
Software development with JTAG debugger is also 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	4 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 on an ATMEL AT91SAM7S256 CPU running at 48MHz.

embOSView offers system analysis during runtime

embOSView with Atmel AT91SAM7S256 CPU serves as sample

Available BSPs

Atmel's AT91SAM7A3 Evalboard supported by embOS

Atmel's AT91SAM7S Evalboard supported by embOS

Atmel's AT91SAM7SE Evalboard supported by embOS

Atmel's AT91SAM7X Evalboard supported by embOS

NXP LPC2106 IAR SK Evalboard supported by embOS

NXP LPC2148 IAR SK Evalboard supported by embOS

ST STR912 IAR SK Evalboard supported by embOS

TI TMS470R1B1M IAR SK Evalboard supported by embOS

Available Emulators

SEGGER J-Link with SEGGER GDB server and GDB debugger

Additional information

Release Notes embOS ARM for GNU tools