embOS for ARM7 / ARM9 / XScale was developed for and with GNU tools. It comes with easy to use make files for GNU tools and batch files for the GDB debugger.
You can use any GNU toolchain, but we recommend the Yagarto toolchain (www.yagarto.de).
Software development with a JTAG debugger like J-Link 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

Available Emulators

• SEGGER J-Link with SEGGER GDB server and GDB debugger

  

  

Board support packages

embOS comes with lots of ready to go start projects and support packages for various ARM7/9 CPUs and starterboards.

CPU	Eval board
Atmel AT91SAM7A3	Atmel AT91SAM7A3-EK
Atmel AT91SAM7S64	Atmel AT91SAM7S64-EK
Atmel AT91SAM7S256	Atmel AT91SAM7S256-EK
Atmel AT91SAM7SE512	Atmel AT91SAM7SE-EK
Atmel AT91SAM7X256	Atmel AT91SAM7X-EK
Atmel AT91SAM9G45	Atmel AT91SAM9G45-EK
Atmel AT91SAM9260	Atmel AT91SAM9260-EK
NXP LPC2106	IAR LPC2106 KS
NXP LPC2148	IAR LPC2148 KS
NXP LPC2378	KEIL MCB2300
NXP LPC2468	Embedded Artists LPC2468
ST STR912	ST STR912-SK
TI TMS470R1B1M	TI TMS470R1B1M

 

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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-elf-gcc  V4.4.2
Assembler: arm-elf-as   V4.4.2
Librarian: arm-elf-ld   V4.4.2

New features

Version 3.82m

1. BSP for ATMEL AT91SAM9G45 added.
   embOS for ARM GNU now comes with a start project and BSP for the ATMEL AT91SAM9G45 which runs on the ATMEL AT91SAM9M10G45-EK eval board but may be used on other hardware as well.
2. Update to latest embOS generic sources V3.82m which elimiate a "strict-aliasing rules violation" warning.
3. Makefiles in Start projects corrected.

Version 3.82g

1. Update to latest embOS generic sources V3.82g.

Version 3.82e

1. LPC 2378 CPU support
   Start project and board support package for NXP LPC2378 CPU added.
   The project was tested on the KEIL MCB2300 board, but may be used on other boards as well.
2. Update to latest embOS generic sources V3.82e.

Version 3.60d

1. LPC 2468 CPU support
   Start project and board support package for NXP LPC2468 CPU added.
   The project was tested on the Embedded Artists LPC2468-16-OEM Board, but may be used on other boards as well.

Version 3.60a

1. TI TMS470R1B1M CPU support
   Start project and board support package for TI TMS470R1B1M CPU added.

Version 3.52e2

1. NXP LPC 2106 CPU support
   Start project and board support package for NXP LPC2106 CPU added.
2. NXP LPC 2148 CPU support
   Start project and board support package for NXP LPC2148 CPU added.

Version 3.52e1

1. ATMEL AT91SAM7 CPU support
   Start projects and board support packages for ATMEL AT91SAM7 CPUs added.
2. ST STR912 CPU support
   Start project and board support package for ST STR912 CPUs added.

Version 3.52d

NONE.
Initial version for ARM GNU, based on embOS sources 3.52d.

Improvements

Version 3.52d

NONE.
Initial version for ARM GNU, based on embOS sources 3.52d.

Program corrections

Version 3.82i

1. Makefiles corrected
   The makefiles in the start project folders passed a wrong paramter to the assembler which destroyed some assembly sources. A re-make after a make clean therefore failed in the start project folders.
   This problem existed in all previous versions of embOS_ARM_GNU and is fixed with version 3.82i

Version 3.60a

Big endian libraries were not built correctly.
The assembler files were always assemblied in little-endian.

Version 3.52e

Wrong RAM start address in linker command file.
There was a wrong RAM start address in the linker command file.

Version 3.52d

NONE.
Initial version for ARM GNU, based on embOS sources 3.52d.

Known problems / Limitations

Version 3.52d

NONE

Release history

Version	Release date	Short explanation
V3.82m	25 Nov 2010	BSP for ATMEL AT91SAM9G45 added. Update to latest embOS generic sources V3.82m Makefiles in Start projects corrected.
V3.82g	12 May 2010	Update to latest embOS generic sources V3.82g.
V3.82e	16 April 2010	LPC2378 supported added. Update to latest embOS generic sources V3.82e.
V3.60d	21 Jul 2008	LPC2468 supported.
V3.60a	12. Feb 2008	Fixed big endian libraries.
V3.52e2	14. Dec 2007	NXP LPC2106/2148 supported.
V3.52e1	10. Dec 2007	AT91SAM7 series / STR912 supported.
V3.52e	30. Nov 2007	Wrong RAM start address in linker command file.
V3.52d	21. Nov 2007	Initial version for ARM GNU, based on embOS sources 3.52d

Miscellaneous

This document was first released with version 3.52d of the software.
Software released earlier is documented internally.
This information is available at request.