Cortex M3, IAR

embOS for Cortex M3 was developed for and with IAR's compiler version 4.42A and V5.11 and supports all memory models offered by these compilers. It comes with easy to use start projects for IAR's embedded workbench. Initilization code for different Cortex M3 starter boards is included. Software development with C-SPY simulator or C-SPY debugger with JTAG tools like J-Link ARM is possible.

Resources and performance data

Memory usage
Kernel size (ROM)	approx. 1700 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)	72 bytes
Timing
Context switch time	TBD
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 Luminary LM3S811 CPU running at 6MHz.

embOSView offers system analysis during runtime

embOS plugin for IAR Workbench

The new embOS Plugin for IAR Workbench allows embOS system analysis during debug sessions. The plugin shows system state, tasks, mailboxes, semaphores and software timer.

Available Emulators

• J-Link ARM
• ARM

Additional information

Release Notes embOS CM3 for IAR compiler V4.42
Release Notes embOS CM3 for IAR compiler V5.1x
IAR Web site for additional compiler info / support

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Release notes embOS CM3 for IAR compiler V4.42

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 ICCARM  V4.42A
Assembler: IAR AARM    V4.42A
Librarian: IAR XAR     V1.03L
Workbench: IAR IARIDE  V4.8

New features

Version 3.60d

1. Update to embOS sources 3.60d
   embOS comes with several new features which are explained in the generic release notes and manual.
2. OS_POWER module implemented.
   The OS_POWER module may be used to control different power saving modes when entering idle state.
   Individual flags for different peripherals may be set whenever a peripheral needs power or clock, and may be reset, when power is not needed.
   The state of the power flags may be examined during OS_Idle by a call of OS_POWER_GetMask().
   This allows to switch off all of those peripherals which are not needed during idle times.
3. BSP for IAR STM-SK Eval board renamed to STM32F103_STM_SK.
   BSP is now for IAR STM-SK only instead of IAR STM-SK and ST MB525.
4. BSP for ST MB525 Eval board added.
   Start project and board support package for STM32F103 CPU and ST MB525 eval board added.
5. BSP for ST MB672 Eval board added.
   Start project and board support package for STM32F103 CPU and ST MB672 eval board added.

Version 3.60a

1. Update to embOS sources 3.60a
   embOS comes with several new features which are explained in the generic release notes and manual.

Version 3.52e2

1. BSP for IAR STM-SK Eval board added.
   The Start project and board support package for STM32F10 supports now also
   the IAR STM32-SK eval board.

Version 3.52c

1. OS_SetTaskName() introduced
   OS_SetTaskName() allows modification of task names on the fly.
   This may be useful if the functionality of a task changes during runtime and the new state should be shown using embOSView or an other task visualisation tool.

Version 3.52a

1. Luminary Micro LM3S1968 CPU support
   Start project and board support package for LM3S1968 CPUs added.
2. Luminary Micro LM3S8962 CPU support
   Start project and board support package for LM3S8962 CPUs added.
3. Task switch time can be measured by application
   embOS now comes with sample applications which allow accurate measurement of task switch time in a running application.

Version 3.40c

1. OS_Yield() may suspend a task unconditionally
   When tasks are running on round robin with timeslice, the function OS_Yield() can be used to end the timeslice of the running task immediately and activate an other task with the same priority which is ready for execution. The function has no effect on tasks that are not running on round robin.
2. UART and PLL added
   Uart and PLL initialization to BSP added.

Version 3.40a

1. New BSP for STM32F10 added.
   embOS now comes with board support package for STM32F10.

Version 3.40

1. Task switch time can be measured by application
   embOS now comes with sample applications which allow accurate measurement of task switch time in a running application.
2. Automatic call of OS_INIT_SYS_LOCKS() removed.
   During initialization of embOS, OS_INIT_SYS_LOCK() is not called automatically.
   As most of the applications do not need thread safe system libraries, an automatic activation of syslocks causes unwanted overhead.
   If supported and required, the user may call OS_INIT_SYS_LOCKS() from his own application after normal initialization of embOS.
3. OS_TimerEx, Extended timer implemented
   Extended timers are software timers which call a user defined callback function when the timer expires.
   In comparison to normal embOS timers, a parameter is passed to the timer callback function.
   The parameter value is initialized during timer creation.

Version 3.32j

1. Initial version for Cortex M3

Improvements

Version 3.60

1. IAR Embedded Workbench for ARM V5.11 compatibility
   embOS for CM3 for IAR V511 is now compatible with IAR Embedded Workbench for ARM V5.11.

Version 3.52e

1. All embOS variables located in one module.
   All embOS variables are located in one module now. In previous versions of embOS, some module specific embOS variables were located in the module they were used for.

Version 3.52a

1. Scheduler optimized
   The embOS scheduler was optimized to reduce task switching time and interrupt latencies.
2. OS_Yield() now writes an entry into the trace buffer
   When using the debug library with trace capabilities, OS_Yield() writes an entry into the trace buffer which shows the function call and the calling task.
   embOSView version 3.40d is required to show this entry.
3. Task switch to OS_Idle() modified.
   The call of OS_Idle() from OS_ChangeTask can be overwritten (inhibited) by defining the macro OS_IDLE() which is norammly defined as OS_Idle().
   This allows task switching via an exception for specific CPU/compiler versions.
4. Pointer comparison improved for fixed size memory pools (OS_MEMF module).
   Some compiler produced wrong pointer comparison code in far memory model.
   For specific CPU/compiler versions, the new OS_POINTER_TO_VALUE() function was inroduced to deliver correct results in pointer comparison.

Version 3.40b

1. Queue management improved.
   For some CPUs, the buffer start address for Queues has to be aligned. Now embOS automatically corrects the alignment, if required.

Version 3.40a

1. Counting semaphores improved.
   Counting semaphores are now int values and a overflow will be catched, so that embOS runs into OS_Error().

Version 3.40

1. Task switch time improved.
   Scheduling optimized to improve task switch time.
2. Task switch time improved for task events.
   Task event handling modified to improve task switch time for tasks waiting on events.
3. Interrupt latency improved.
   During task switch, the time period when interrupts are disabled is reduced.
4. embOS timer tick handler improved.
   The standard timer tick handler run faster now. The embOS internal time variable is incremented by 1 on every timer tick.
   When different increments are required, the new timer tick handler OS_HandleTick_Ex(), OS_TickHandler_Ex() or OS_HandleTickDI_Ex() have to be used by application.
   Different inctrements may be configured by a call of OS_CONFIG().

Version 3.32j

1. NONE, initial version for Cortex M3.

Program corrections

Version 3.52e1

1. OS_TaskEx corrected
   Parameter passing to OS_TaskEx did not work. A task always received a NULL pointer. The problem existed in all previous embOS versions for CM3 and is fixed with version 3.52e1.

Version 3.52e2

1. Batch file for generating libraries corrected.
   The batch did not build the release library for big endian CPUs.

Version 3.52e1

1. OS_TaskEx corrected
   Parameter passing to OS_TaskEx did not work. A task always received a NULL pointer. The problem existed in all previous embOS versions for CM3 and is fixed with version 3.52e1.

Version 3.52e

1. Interrupt table in RAM corrected
   Variable interrupt table in RAM did not work correct.

Version 3.52b

1. OS_SendString() corrected.
   When sending an empty string, the calling task was suspended forever.
   The problem existed in all previous embOS versions and is fixed with version 3.52b.
2. embOSView corrected.
   When the update interval of embOSView was set to 200ms or a longer value, the reaction of user input or mouse events was blocked for the same time.
   The problem existed since version 3.32 of embOSView and is fixed with version 3.52b.

Version 3.52a

1. OS_Suspend() corrected
   When using the debug library with trace capabilities, a call of OS_Suspend() wrote a wrong trace code into the trace buffer.
   Instead of writing the code for task suspension, the code for task termination was written.
   The function itself worked correctly, only the data written into the trace buffer was wrong.
   The problem existed in all previous embOS versions and is fixed with version 3.40d.

Version 3.40

1. OS_Unuse() corrected
   OS_Unuse() must not be called from a task that does not claim the resource semaphore.
   According to the documentation, the debug build of embOS should generate a call to OS_Error() if this fault happens.
   All previous versions of embOS did not call OS_Error(). Now, OS_Error() will be called in that situation with error code 156: OS_ERR_RESOURCE_OWNER().
2. OS_EVENT_Delete() corrected
   OS_EVENT_Delete() did not work correctly. OS_LeaveRegion() was called inside the function without calling OS_EnterRegion() bfore.
   In debug builds of embOS, the error handler OS_Error() was called with error 151 (OS_ERR_LEAVEREGION_BEFORE_ENTERREGION).
   In release builds the system was blocked because the underflow of region count inhibts all further task switches, or system crashes, because incrementing the region count the next time allows task switches instead of blocking them. The problem existed in all previous versions and is fixed with version 3.32l.
3. Round-robin task switching corrected.
   Round robin task switching did not work correctly in previous version. A task which was blocked for some reason could be activated. The system crashed during task switch.
   The problem existed since version 3.32j and is fixed with version 3.32l.
4. Handler function _OS_OnTx() for serial communication to embOSView corrected.
   The transmission handler for communication with embOSView might have sent incorrect data to embOSView, because internal control state was updated after sending the data.
   The problem occured on a new embOS port for a specific CPU only and is fixed with version 3.32k.

Version 3.32j

1. NONE, initial version for Cortex M3.

Known problems/limitations

Version 3.52

1. NONE.

Version 3.40

1. NONE.

Version 3.32j

1. NONE, initial version for Cortex M3.

Release history

Version	Release date	Short explanation
V3.60d	05. Jun 2008	Update to new embOS sources 3.60d. OS_POWER module implemented. BSP for IAR STM-SK split up into IAR STM-SK and ST MB525. BSP for ST MB672 eval board added.
V3.60a	12. March 2008	Update to new embOS sources 3.60a.
V3.52e2	07. March 2008	BSP for IAR STM-SK Eval board added. Batch file for generating libraries corrected.
V3.52e1	21. December 2007	OS_TaskEx corrected.
V3.52e	29. November 2007	New generic embOS sources. Interrupt table in RAM corrected.
V3.52a	17. September 2007	New BSPs for Luminary Micro LM3S1968 and LM3s8962 CPUs. Scheduler optimized. Task switch to OS_Idle() modified.
V3.40c	28. June 2007	OS_Yield() implemented. Uart and PLL for BSP/STM32F10 added.
V3.40a	05. June 2007	Counting semaphores improvement. BSP for STM32F10 added.
V3.40	24. May 2007	New start projects for LM3S6965 and LM3S6965. New embOS sources 3.40.
V3.32j	06. Jan 2007	Initial version for Cortex M3

Miscellaneous

This document was first released with version 3.32f of the software.
Software released earlier is documented internally. This information is available at request.

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Release notes embOS CM3 for IAR compiler V5.1x

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 ICCARM   V5.41.0.51741
Assembler: IAR IASMARM  V5.41.0.51741
Librarian: IAR IARCHIVE V1.1.1
Workbench: IAR IARIDE   5.6.0.1356

New features

Version 3.82h1

1. embOS Cortex M3 and embOS Cortex M0 are merged to embOS Cortex M3.

Version 3.82h

1. Profiling with embOSView via J-Link
   All embOS start projects and the embOS libraries were modified to allow communication with embOSView via J-Link.
   The new embOSView version 3.82g allows selection of a communication to a Cortex M3 using J-Link with JTAG or SWD interface.
   The communication to embOSView starts after the call of OS_Start() and can be used in parallel with a debugging session which uses J-Link as debugging probe.
2. Fully CMSIS compliant projects
   All start projects of embOS for Cortex-M3 are now fully CMSIS compliant.
   The projects come with new startup code and vector tables which are fully CMSIS compliant.
   When CMSIS shall be used for the application, the chip specific CMSIS startup code and vector tables can be used.
   CMSIS libraries of the chip vendor are not required to run embOS, embOS can be used as is.
3. Generic CMSIS project template
   embOS for Cortex M3 now comes with a generic CMSIS compatible start project which runs on any Cortex M3 CPU.
   To run the project on a specific chip, the startup code and the vector table may be replaced by the chip vendor specific versions of these files.
   No modification on any embOS function or file is required. The vendor specific CMSIS files will guarantee that the embOS timer runs at expected rate of 1ms.

Version 3.82e2

1. BSP for ATMEL AT91SAM3S added
   embOS now comes with a start project for the AT91SAM3S which is prepared to run on the SAM3S-EK eval board.
   The start project contains debug configurations for flash or RAM.
   Both UART connectors of the board may be used for embOSView.
   The project comes with new startup code and vector tables which are fully CMSIS compliant.
2. CMSIS compliant scheduler call implemented
   The embOS scheduler function was renamed to be fully CMSIS compliant.
   Target CPU specific CMSIS libraries may be used together with embOS now.
   There is no need to modify the vector tables which come with the CMSIS libraries.

Version 3.82e1

1. Projects for LPC176x updated.
   The debugger configuration settings of previous versions caused some trouble when the target should be accessed with J-Link.

Version 3.82e

1. CMSIS compliant project for STM32/MB672 added.

Version 3.82c

1. BSP for TMPM330 added
2. Profiling support added to STM32 MB784 eval bord BSP.
3. Update to latest embOS generic sources V3.82c
4. All projects have now remarks enabled

Version 3.80g3

1. Project for AT91SAM3U runs with IAR flashloader
   The embOS start project for the AT91SAM3U CPU was modified to run with the Flasherloader which comes with the latest IAR workbench (EW-ARM 5.40.
   The flashloader can be used with any J-link version, but the project requires version 5.40 or later of the IAR workbench.
   EW-ARM 5.40 is the first version that supports the AT91SAM3U.

Version 3.80g1

1. Support for ST STM32F107 added
   embOS version 3.80g1 comes with a ready to go start project for the ST32MF107 CPU.
   The start project is prepared to run on the ST MB 784 eval board and supports flash programming using C-Spy and J-Link.
2. Support for IAR LPC1766-SK added
   embOS version 3.80g1 comes with a ready to go start project for the IAR LPC1766-SK eval board.
   The start project is prepared to run on the eval board and supports flash programming using C-Spy and J-Link.
   The project is built for the workbench / compiler version 5.30 which delivers the flash loader for the LPC 1766.

Version 3.80g

1. Scheduling optimized
   Update to new embOS version 3.80 with optimized internal data structures to speed up scheduling and task switches.
   The new embOS version requires the C-Spy plugin V3.80 or later. The plugin comes with embOS.
2. New embOS plugin with task sensitivity
   embOS version 3.80g for Cortex M3 now comes with the new embOS IAR plugin V3.80.1 for C-Spy which supports task sensitivity for Cortex M3.
   Task sensitivity is supported since embOS version 3.62c.
   Previous versions of embOS for Cortex M3 can be used with the new plugin, but do not support the task sensitivity.
3. Support for ATMEL AT91SAM3U
   embOS version 3.80g comes with a ready to go start project for the new ATMEL AT91SAM3U series.
   Debugging and flash programming using C-Spy and J-Link is supported.
   The latest version of J-Link software is required to allow programming of the AT91SAM3U.
4. Support for NXP LPC176x series
   embOS version 3.80g comes with a ready to go start project for the new NXP LPC176x series.
   The start project is prepared to run on the KEIL eval board and supports flash programming using C-Spy and J-Link.
   The project is built for the workbench / compiler version 5.30 which delivers the flash loader for the LPC 1766.

Version 3.62

1. Update to embOS sources 3.62
   embOS comes with new features which are explained in the generic release notes and manual.
2. Update to new EWARM compiler version 5.20
   embOS version 3.62 was built with the IAR compiler V5.20 and the start projects were updated to be used with the new workbench.

Version 3.60d

1. Update to embOS sources 3.60d
   embOS comes with several new features which are explained in the generic release notes and manual.
2. OS_POWER module implemented.
   The OS_POWER module may be used to control different power saving modes when entering idle state.
   Individual flags for different peripherals may be set whenever a peripheral needs power or clock, and may be reset, when power is not needed.
   The state of the power flags may be examined during OS_Idle by a call of OS_POWER_GetMask().
   This allows to switch off all of those peripherals which are not needed during idle times.
3. BSP for IAR STM-SK Eval board renamed to STM32F103_STM_SK.
   BSP is now for IAR STM-SK only instead of IAR STM-SK and ST MB525.
4. BSP for ST MB525 Eval board added.
   Start project and board support package for STM32F103 CPU and ST MB525 eval board added.
5. BSP for ST MB672 Eval board added.
   Start project and board support package for STM32F103 CPU and ST MB672 eval board added.

Version 3.60a

1. Update to embOS sources 3.60a
   embOS comes with several new features which are explained in the generic release notes and manual.

Version 3.60

1. IAR Embedded Workbench for ARM V5.11 compatibility
   Source and project updates to be compatible with IAR Embedded Workbench for ARM V5.11.

Version 3.52c

1. OS_SetTaskName() introduced
   OS_SetTaskName() allows modification of task names on the fly.
   This may be useful if the functionality of a task changes during runtime and the new state should be shown using embOSView or an other task visualisation tool.

Version 3.52a

1. Luminary Micro LM3S1968 CPU support
   Start project and board support package for LM3S1968 CPUs added.
2. Luminary Micro LM3S8962 CPU support
   Start project and board support package for LM3S8962 CPUs added.
3. Task switch time can be measured by application
   embOS now comes with sample applications which allow accurate measurement of task switch time in a running application.

Version 3.40c

1. OS_Yield() may suspend a task unconditionally
   When tasks are running on round robin with timeslice, the function OS_Yield() can be used to end the timeslice of the running task immediately and activate an other task with the same priority which is ready for execution. The function has no effect on tasks that are not running on round robin.
2. UART and PLL added
   Uart and PLL initialization to BSP added.

Version 3.40a

1. New BSP for STM32F10 added.
   embOS now comes with board support package for STM32F10.

Version 3.40

1. Task switch time can be measured by application
   embOS now comes with sample applications which allow accurate measurement of task switch time in a running application.
2. Automatic call of OS_INIT_SYS_LOCKS() removed.
   During initialization of embOS, OS_INIT_SYS_LOCK() is not called automatically.
   As most of the applications do not need thread safe system libraries, an automatic activation of syslocks causes unwanted overhead.
   If supported and required, the user may call OS_INIT_SYS_LOCKS() from his own application after normal initialization of embOS.
3. OS_TimerEx, Extended timer implemented
   Extended timers are software timers which call a user defined callback function when the timer expires.
   In comparison to normal embOS timers, a parameter is passed to the timer callback function.
   The parameter value is initialized during timer creation.

Version 3.32j

1. Initial version for Cortex M3

Improvements

Version 3.80g2

1. Systick timer initialization modified
   The SYSTICK timer is normally used as system timer for embOS. Previous versions of embOS for Cortex-M3 initialized the interrupt priority during the system initialization called from OS_InitKern().
   Now the systick timer initialization is completely done during OS_InitHW() and can therefore be modified if required by the application.
   By modification of OS_InitHW(), any peripheral timer may be used as system timer for embOS, leaving the systick timer untouched.

Version 3.80g1

1. Code modified to avoid warnings
   Some compile time switches were not predefined in some projects and therefore produced a warning when remarks were enabled.
   This did not cause any problem, but might have been confusing.

Version 3.60

1. IAR Embedded Workbench for ARM V5.11 compatibility
   embOS for CM3 for IAR V511 is now compatible with IAR Embedded Workbench for ARM V5.11.

Version 3.52e

1. All embOS variables located in one module.
   All embOS variables are located in one module now. In previous versions of embOS, some module specific embOS variables were located in the module they were used for.

Version 3.52a

1. Scheduler optimized
   The embOS scheduler was optimized to reduce task switching time and interrupt latencies.
2. OS_Yield() now writes an entry into the trace buffer
   When using the debug library with trace capabilities, OS_Yield() writes an entry into the trace buffer which shows the function call and the calling task.
   embOSView version 3.40d is required to show this entry.
3. Task switch to OS_Idle() modified.
   The call of OS_Idle() from OS_ChangeTask can be overwritten (inhibited) by defining the macro OS_IDLE() which is normally defined as OS_Idle().
   This allows task switching via an exception for specific CPU/compiler versions.
4. Pointer comparison improved for fixed size memory pools (OS_MEMF module).
   Some compiler produced wrong pointer comparison code in far memory model.
   For specific CPU/compiler versions, the new OS_POINTER_TO_VALUE() function was introduced to deliver correct results in pointer comparison.

Version 3.40b

1. Queue management improved.
   For some CPUs, the buffer start address for Queues has to be aligned. Now embOS automatically corrects the alignment, if required.

Version 3.40a

1. Counting semaphores improved.
   Counting semaphores are now int values and an overflow will be caught, so that embOS runs into OS_Error().

Version 3.40

1. Task switch time improved.
   Scheduling optimized to improve task switch time.
2. Task switch time improved for task events.
   Task event handling modified to improve task switch time for tasks waiting on events.
3. Interrupt latency improved.
   During task switch, the time period when interrupts are disabled is reduced.
4. embOS timer tick handler improved.
   The standard timer tick handler run faster now. The embOS internal time variable is incremented by 1 on every timer tick.
   When different increments are required, the new timer tick handler OS_HandleTick_Ex(), OS_TickHandler_Ex() or OS_HandleTickDI_Ex() have to be used by application.
   Different increments may be configured by a call of OS_CONFIG().

Version 3.32j

1. NONE, initial version for Cortex M3.

Program corrections

Version 3.80h

1. BSP for AT91SAM3U corrected.
   The previous versions of the initialization code for the AT91SAM3U did not initialize the second Flash memory controller for devices with 256KB Flash.
   This resulted in Flash read errors when the Flash memory in the second Flash bank was accessed.

Version 3.80g3

1. Systick timer initialization corrected
   The previous version V3.80g2 of embOS for Cortex-M3 still affected the SYSTICK timer settings during a call of OS_InitKern().
   The Systick timer was disabled.
   Now the systick timer initialization is completely done during OS_InitHW() and can therefore be modified if required by the application.

Version 3.52e1

1. OS_TaskEx corrected
   Parameter passing to OS_TaskEx did not work. A task always received a NULL pointer. The problem existed in all previous embOS versions for CM3 and is fixed with version 3.52e1.

Version 3.52e

1. Interrupt table in RAM corrected
   Variable interrupt table in RAM did not work correct.

Version 3.52b

1. OS_SendString() corrected.
   When sending an empty string, the calling task was suspended forever.
   The problem existed in all previous embOS versions and is fixed with version 3.52b.
2. embOSView corrected.
   When the update interval of embOSView was set to 200ms or a longer value, the reaction of user input or mouse events was blocked for the same time.
   The problem existed since version 3.32 of embOSView and is fixed with version 3.52b.

Version 3.52a

1. OS_Suspend() corrected
   When using the debug library with trace capabilities, a call of OS_Suspend() wrote a wrong trace code into the trace buffer.
   Instead of writing the code for task suspension, the code for task termination was written.
   The function itself worked correctly, only the data written into the trace buffer was wrong.
   The problem existed in all previous embOS versions and is fixed with version 3.40d.

Version 3.40

1. OS_Unuse() corrected
   OS_Unuse() must not be called from a task that does not claim the resource semaphore.
   According to the documentation, the debug build of embOS should generate a call to OS_Error() if this fault happens.
   All previous versions of embOS did not call OS_Error(). Now, OS_Error() will be called in that situation with error code 156: OS_ERR_RESOURCE_OWNER().
2. OS_EVENT_Delete() corrected
   OS_EVENT_Delete() did not work correctly. OS_LeaveRegion() was called inside the function without calling OS_EnterRegion() bfore.
   In debug builds of embOS, the error handler OS_Error() was called with error 151 (OS_ERR_LEAVEREGION_BEFORE_ENTERREGION).
   In release builds the system was blocked because the underflow of region count inhibits all further task switches, or system crashes, because incrementing the region count the next time allows task switches instead of blocking them. The problem existed in all previous versions and is fixed with version 3.32l.
3. Round-robin task switching corrected.
   Round robin task switching did not work correctly in previous version. A task which was blocked for some reason could be activated. The system crashed during task switch.
   The problem existed since version 3.32j and is fixed with version 3.32l.
4. Handler function _OS_OnTx() for serial communication to embOSView corrected.
   The transmission handler for communication with embOSView might have sent incorrect data to embOSView, because internal control state was updated after sending the data.
   The problem occurred on a new embOS port for a specific CPU only and is fixed with version 3.32k.

Version 3.32j

1. NONE, initial version for Cortex M3.

Known problems/limitations

Version 3.22

1. NONE.

Release history

Version	Release date	Short explanation
V3.82h1	21. July 2010	embOS CM3 IAR supports now also Cortex M0.
V3.82h	31. Mai 2010	embOSView runs via J-Link. Fully CMSIS compliant
V3.82e2	10. Feb 2010	CMSIS compliant BSP for AT91SAM3S added.
V3.82e1	29. Jan 2010	Projects for LPC176x updated.
V3.82e	28. Jan 2010	CMSIS compliant project for STM32/MB672 added.
V3.82c	10. Dec 2009	BSP for TMPM330 added. Profiling support for MB784 added. Update to latest embOS generic sources V3.82c Remarks enabled for all projects
V3.80h	06. Aug 2009	BSP for AT91SAM3U corrected.
V3.80g3	14. Jul 2009	Timer initialization modified.
V3.80g2	09. Jul 2009	Timer initialization modified.
V3.80g1	09. Jul 2009	ST STM32F107 supported. IAR LPC1766-SK supported.
V3.80g	05. Jun 2009	New embOS plugin supported New optimized embOS sources.
V3.62	01. Oct 2008	Update to new embOS sources 3.62. Update to IAR compiler V5.20.
V3.60d	05. Jun 2008	Update to new embOS sources 3.60d. OS_POWER module implemented. BSP for IAR STM-SK split up into IAR STM-SK and ST MB525. BSP for ST MB672 eval board added.
V3.60a	12. Mar 2008	Update to embOS version 3.60a.
V3.60	11. Jan 2008	Update to IAR compiler V5.11.
V3.52e1	21. Dec 2007	OS_TaskEx corrected.
V3.52e	29. Nov 2007	New generic embOS sources. Interrupt table in RAM corrected.
V3.52a	17. September 2007	New BSPs for Luminary Micro LM3S1968 and LM3s8962 CPUs. Scheduler optimized. Task switch to OS_Idle() modified.
V3.40c	28. Jun 2007	OS_Yield() implemented. Uart and PLL for BSP/STM32F10 added.
V3.40a	05. Jun 2007	Counting semaphores improvement. BSP for STM32F10 added.
V3.40	24. May 2007	New start projects for LM3S6965 and LM3S6965. New embOS sources 3.40.
V3.32j	06. Jan 2007	Initial version for Cortex M3

Miscellaneous

This document was first released with version 3.32f of the software.
Software released earlier is documented internally. This information is available at request.