embOS for ColdFire was developed for and with IAR Workbench version 1.22D and supports all memory models and CPU variiants offered by this compiler. It comes with easy to use start projects for the IAR Embedded Workbench.

Resources and performance data

Memory usage
Kernel size (ROM)	approx. 1200 bytes
Kernel RAM usage	38 bytes
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	6 bytes
Min. stack-size per task (RAM)	72 bytes
Timing
Context switch time	approx. 5.00 µs
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

embOSView offers system analysis during runtime

 

Available Emulators

• Multilink (P&E Micro)

Additional information

Freescale Web site for additional cpu info / support

Board support packages

embOS comes with lots of ready to go start projects and support packages for various ColdFire V1 / V2 / V3 CPUs and starterboards.

CPU	Eval board
Freescale PCF51AC256AVLKE	Axiom DEMOAC AXM-0440
Freescale MCF5222x	Freescale M52223EVB
Freescale PCF52233CAF60	Axiom M52233DEMO
Freescale MCF52223AF80	Freescale MCF52223_SK

 

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Release notes V3.62c2

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:  IAR ICCCF     V1.22D
Assembler: IAR ACF       V1.22D
Librarian: IAR XAR       V1.03P
Workbench: IAR IARIDEPM  V5.3.3.780

New features

Version 3.62c1

1. Support for all ISA variants added.
   embOS now comes with libraries which were compiled with the ISA A, ISA A+, ISA B and ISA C option.
   Thus, all ColdFire variants, including V1, V2 and future versions, are supported by embOS now.


2. Start project for M51AC256 added.
   embOS now comes with a ready to go start project fpr the V1 CPU M51AC256 which runs on the DEMOAC starter board.
   The project may be downloaded into the internal RAM or Flash using the on board BDM debugger and CSpy.


3. Update to new embOS sources V3.62c
   embOS for ColdFire now is based on embOS version 3.62c whith several new features and improvements.
   All modifications of the generic embOS sources are described in the generic release notes.

Version 3.52d

Support for nestable interrupts.

Version 3.50b

None.

Improvements

Version 3.50b

None.

Program corrections

Version 3.62c2

1. OS_ISRHandlerNestable corrected
   The new handler for nestable interrupts failed when an interrupt occured in a critical section.
   The handler delivered a wrong interrupt vector number.
   The problem existed in version 3.62c1 of embOS and is fixed with version 3.62c2.


2. Task switch from interrupt corrected
   The previous version of embOS for ColdFire might have crasehd when executing a task switch from interrupt.
   The problem occured when a task was interrupted with an un-aligned stack.
   The problem existed in version 3.62c1 of embOS and is fixed with version 3.62c2.


3. Startup file and project for M51AC256 corrected
   The M51AC256 CPU needs a reserved area of 20 bytes in Flash
   The previous startup code reserved 16 bytes only.
   The corresponding linker file has to reserve 20 bytes as CFMCONFIG area, starting from address 0x3FC.
   A linker file with correct settings is now delivered with embOS for ColdFire.
   The problem existed in version 3.62c1 of embOS and is fixed with version 3.62c2.

Known problems/limitations

Version 3.50d1

1. Near memory model not supported
   embOS for ColdFire and IAR compiler does not support the near memory model.
   Libraries for the near memory model can be built by compiling the sources.

Release history

Version	Release date	Short explanation
V3.62c2	07. Mai 2010	Interrupt handler corrected.
V3.62c1	22. Feb 2010	All opcode variants supported. New embOS sources V3.62c
V3.52d	08. Nov 2007	Support for nestable interrupts.
V3.50b	18. Jul 2007	First version with release history

Miscellaneous

This document was first released with version 3.50b of the software.
Software released earlier is documented internally. This information is available at request.