Tool chain used for build

The following tools have been used:

Compiler:  IAR ICCARM  V4.41A
Assembler: IAR AARM    V4.41A
Librarian: IAR XAR     V1.03L
Workbench: IAR IARIDE  V4.7

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.
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.
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

Initial version for Cortex M3

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 3.32j

NONE, initial version for Cortex M3.

Program corrections

Version 3.40

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().
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.
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

NONE, initial version for Cortex M3.

Known problems/limitations

Version 3.40

NONE.

Version 3.32j

NONE, initial version for Cortex M3.

Release history

Version	Release date	Short explanation
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.