ARM7/9, Atollic

embOS for ARM7 / ARM9 / XScale was developed for and with Atollic's compiler  and supports all memory models offered by this compiler. It comes with easy to use start projects for Atollic TrueStudio. Initilization code for various ARM CPUs is included. Software development with GDB server with JTAG tools like J-Link ARM is possible.

Resources and performance data

Memory usage
Kernel size (ROM)	approx. 1500 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 on an LH79531 CPU running at 48MHz.

embOSView offers system analysis during runtime

Available Emulators

• J-Link ARM
• ARM
• Lauterbach

Additional information

Atollic Web site for additional compiler info / support

Release notes

1. Tool chain used for build
2. New features
3. Improvements
4. Program corrections
5. Known problems/limitations
6. Release history
7. Miscellaneous

Tool chain used for build

The following tools have been used:

Compiler:  arm-atollic-eabi-gcc 4.4.1
Assembler: arm-atollic-eabi-as 2.19.1
Librarian: arm-atollic-eabi-ld 2.19.1
Workbench: Atollic TrueStudio TX 1.1.0

New features

Version 3.82b

1. NONE
   Initial version for Atollic TrueStudio V1.10

Improvements

Version 3.82b

1. NONE
   Initial version for Atollic TrueStudio V1.10

Program corrections

Version 3.82b

1. NONE
   Initial version for Atollic TrueStudio V1.10

Known problems/limitations

Version 3.82b

1. NONE
   Initial version for Atollic TrueStudio V1.10

Release history

Version	Release date	Short explanation
V3.82b	11. Nov 2009	Initial version for Atollic V1.10