embOS for AVR32UC was developed for and with GNU tools and supports all memory models offered by this compiler. It comes with easy to use start projects for AVR32 Studio.

Resources and performance data

Memory usage
RAM usage per task control block	36 bytes
RAM usage per resource semaphore	16 bytes
RAM usage per counting semaphore	8 bytes
RAM usage per mailbox	24 bytes
RAM usage per software timer	20 bytes
RAM usage event	20 bytes
Min. stack-size per task (RAM)	44 bytes
Timing
Context switch time	7.88 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 AVR32A CPU (AT32UC3A0512) running at 66 MHz.

embOSView offers system analysis during runtime

Available Emulators

• Atmel AVRA JTAGICE MKII

Board support packages

embOS comes with lots of ready to go start projects and support packages for various AVR32 CPUs and starterboards.

CPU	Eval board
Atmel AT32UC3A0512	Atmel EVK1100
Atmel AT32UC3B0256	Atmel EVK1101
Atmel AT32UC3A3256	Atmel EVK1104

 

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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:  GNU avr32-gcc     V4.3.3
Assembler: GNU avr32-as      V4.3.3
Librarian: GNU avr32-ar      V4.3.3
Workbench: AVR32 Studio      V2.6.0

New features

Version 3.82r

1. Update to latest embOS generic sources V3.82r.
2. BSP for EVK1104 added.

Version 3.60c1

1. Support for new chip revision H and later.
   First ES chip revision handled COUNT/COMPARE registers differently.

Version 3.60c

First version. None.

Program corrections

Version 3.60c

First version. None.

Known problems/limitations

Version 3.60c

None.

Release history

Version	Release date	Short explanation
V3.82r	31. Jan 2011	Update to latest embOS generic sources V3.82r. BSP for EVK1104 added.
V3.60c1	20. Jan 2009	Support for new chip revision.
V3.60c	08. Dec 2008	First version.

Miscellaneous

This document was first released with version 3.60 of the software.
Software released earlier is documented internally. This information is available at request.