Tool chain used for build

The following tools have been used:

        Compiler:  ARM/Thumb C/C++ Compiler,  RVCT3.0 for uVision [Build 951]
        Assembler: ARM/Thumb Macro Assembler, RVCT3.0 for uVision [Build 951]
        Librarian: ARM Archiver,              RVCT3.0 for uVision [Build 951]
        Workbench: KEIL uVision3 Version 3.51

New features

Version 3.40

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 3.32o

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.

Version 3.32m

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

OS_CSemaRequest implemented
May be used to decrement a counting semaphore conditionally, if a signal is available.
The function never blocks the calling task and delivers a result which indicates whether the semaphore was available.

Version 3.32f

All features of generic 3.32f kernel supported.

Improvements

Version 3.40

Task switch time improved.
Scheduling optimized to improve task switch time.
Task switch time improved for task events.
Task event handling modified to improve task switch time for tasks waiting on events.
Interrupt latency improved.
During task switch, the time period when interrupts are disabled is reduced.
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 3.32i

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.

Version 3.32g

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 3.32f

First version. None.

Program corrections

Version 3.32o

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().

Version 3.32l

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.
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.

Version 3.32k

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 3.32h

OS_Error() was required in release build when resource semaphores were used.
When using release build libraries and resource semaphores, the embOS error handler OS_Error() was required and the file OS_Error.c had to be compiled and linked in a project.
The problem existed since version 3.28i of embOS and is fixed with version 3.32h.

Version 3.32f

First version. None.

Known problems/limitations

Version 3.32f

First version. None.

Release history

Version	Release date	Short explanation
V3.40	25. May 2007	Initial version for Cortex M3 Start projects for LM3S6965 and LM3S6965. New embOS sources 3.40.
V3.32f	18. Dec 2006	First version with release history

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.