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HISTORY
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TrueTime 2.0 beta 6, 2010-07-16
===============================
* Network Code Machine functionality added
TrueTime 2.0 beta 5, 2010-05-06
===============================
* Trivial changes to make TrueTime run under Matlab R2009.
* Pre-compiled MEX-files are no longer supplied.
TrueTime 2.0 beta 4, 2009-10-15
===============================
* A bug causing empty error messages has been fixed.
* Another example has been adopted and included: soccer
* Two more network protocols added: FlexRay and PROFINET
TrueTime 2.0 beta 3, 2009-09-18
===============================
* Bug in ttSetPeriod has been fixed.
* A bug relating to scheduling policies multiple kernel blocks has
been fixed
* A serious bug in random number in the CDMA network protocols under
Windows has been fixed
* The block masks callbacks have been completely reprogrammed to allow
* masking and variables as arguments for all block parameters
* Two networking examples have been adapted and included: networked
and AODV.
TrueTime 2.0 beta 2, 2009-05-11
===============================
* A serious bug in the Kernel block with regard to multiple Kernel
blocks in the same model has been fixed.
* Monitor schedule gone.
* Trigger type (raising, falling, either) can be specified for the external
interrupts port.
* Receive block has new output: the time stamp of the message.
TrueTime 2.0 beta 1, 2009-01-14
===============================
New Kernel/Network block features:
* Automatic connections between Kernel/Network/Send/Receive blocks
using hidden Goto/From blocks. The connections are configured in the
block dialogues. This makes it much easier to connect a kernel block
to several Network blocks.
* In the masks it is now possible to hide/show most block inputs and
outputs (removes the need for Ground and Terminator blocks).
* Name changes: The ttGetMsg and ttSendMsg blocks are now called
TrueTime Send and TrueTime Receive instead.
* The Receive block can output the timestamp of the message (telling
when was sent).
* The Send and Receive blocks now support vector data inputs and
outputs.
* The time resolution of the kernel and network blocks is now
explicitely declared to be 1e-12.
* New Ultrasound Network block.
* Possibility to set initial seeds for the pseudo-random number
generators in the Network and Wireless network blocks.
Changes in the Kernel block:
* Number of analog inputs, outputs, external triggers, and network
connections are now configured in the block dialogue. ttInitKernel
has new syntax. ttInitNetwork and ttCreateExternalTrigger have been
replaced by ttAttachNetworkHandler and ttAttachTriggerHandler.
ttAttachNetworkHandler is optional (not needed if you use polling).
* The same handler may now be associated with any number of interrupt
sources (network, trigger or wcet/deadline overrun). The more
general function ttGetInvoker replaces the old ttInvokingTask.
* In the C++ API, new functions ttSetUserData and ttGetUserData can be
used for proper memory allocation/deallocation in init()/free(),
allowing multiple instances of the same block.
* New functions ttCreateCBS/ttAttachCBS/ttSetCBSParameters can be used
for simulation of constant bandwidth servers. Under EDF scheduling, a
task associated with a CBS inherits the deadline of the CBS.
* ttCreateJob can now be used to schedule future task instances.
* Name changes: ttCreateInterruptHandler is now ttCreateHandler.
ttNonPreemptable is now ttNonPreemptible.
* ttNonPreemptible now also works for interrupt handlers.
* ttCreateLog now allows the creation of "free" logs, not associated
with any particular tasks. ttLogNow and ttLogValue are used to write
time or values to them.
* ttCreateTask and ttCreatePeriodicTask no longer take the priority as
in input argument. Use ttSetPriority for each task if you want to
use fixed-priority scheduling.
* Rate-monotonic scheduling did not make sense for aperiodic tasks and
has therefore been dropped - use deadline monotonic instead (by
default, deadline=period for periodic tasks anyway).
* A first release instance may now be specified for ttCreateTask.
* ttUltrasoundPing is used to send a short pulse over an ultrasound
network.
* Complete re-implementation of handlers, timers and scheduling hooks.
TrueTime 1.5, 2007-01-04
=========================
Features added:
* Major performance improvements when using the network blocks. The simulation
time is now linear rather than exponential in the simulated time. (The poor
performance in previous versions was due to Matlab's memory management.)
* Two new Simulink blocks added, making it easier to develop networked
applications. The two blocks makes it possible to send and receive network
messages without using kernel blocks and code functions. A related new
example is also added.
* ttDiscardMessages now returns the total number of discarded messages.
* ttGetInitArg (C++) primitive added.
* New Mote Soccer example added, showing how many nodes can be configured
using the same init scripts and code functions.
Bugs removed:
* ttRetrieve gave a segmentation violation if ttFetch was not called properly.
* ttTryFetch did not unblock tasks that were blocked on ttPost
* ttTryPost did not unblock tasks that were blocked on ttFetch
* ttFetch: A blocked writer was never woken up.
* Segmentation violation when creating a timer using a non-existent interrupt
handler.
* Propagation of clock drift from kernel nodes to network transmission
schedule.
* 802.11 did not back off correctly on the first try when sensing that the
medium was busy.
* ttDiscardMessages did not work as expected with the wireless network.
* ttLogNow, ttLogStart and ttLogStop sometimes wrong when using clock drift.
* Switched Ethernet did not function properly
TrueTime 1.4, 2006-09-21
=========================
* Support for blocking mailboxes (ttPost, ttFetch, ttRetrieve) added.
* Support for semaphores (ttCreateSemaphore, ttTake, ttGive) added.
* ttGetData and ttSetData primitives added.
* ttAbortSimulation primitive added.
* ttDiscardUnsentMessages primitive added.
* Bug in ttwnetwork.cpp regarding probability of packet losses fixed.
* Bug in ttwnetwork.cpp regarding the number of retransmissions fixed.
* Bug in ttwnetwork.cpp and ttnetwork.cpp regarding deletion of
temporary global variables fixed.
* Message lengths in ttSendMsg are now given in bits instead of bytes.
* Support for user defined pathloss function added to the wireless
network block. It can only be used in the Matlab version.
* Problem reading inputs at time zero fixed.
* Major performance improvements (>100% speedup of the execution of the
kernel block) in the Matlab version.
* New AODV routing example added.
TrueTime 1.3, 2005-06-28
=========================
* Support for Matlab 6.1 (R12.1) has been dropped.
* Added support for wireless networks.
* Added support for Dynamic Voltage Scaling by the use of ttSetKernelParameter.
* Added support for clock drift and offsets, configured in the kernel mask.
* Added support for power consumption and batteries.
* Added two new examples treating the wireless network block and power
consumption using batteries.
* Added support for setting pre-and postdelay on a per node basis by using
ttSetNetworkParameter.
TrueTime 1.2, 2004-10-15
=========================
* New internal data structures and a revised implementation of the
kernel block S-function.
* Support for Matlab 7.0 (R14), Matlab 6.5 (R13), and Matlab 6.1 (R12.1).
* MATLAB help for the TrueTime commands, try for example
>> help ttInitKernel
* Broadcast of network messages
* Support for logging of task attributes
* Arrival hook added. Usually coincides with the release hook unless there
is a pending job of the task when the new job is created. In that case the
execution of the release hook will be postponed until the job is activated
from the job queue.
* Syntax of ttCreateJob has been changed. ttCreateJob always creates a
job at the current time. To create a job at a specific time, use a timer.
* Two new tutorial examples included, treating task synchronization and
deadline overrun handling.
* Several bug fixes.
TrueTime 1.13, 2003-10-23
=========================
* Changes in the network block:
- Automatic division of messages into frames has been removed. This feature
should be implemented by higher protocol layers in the computer nodes, if
desired. The "Max framesize" and "Frame overhead" parameters have
consequently been removed.
- Switched Ethernet has been added as a network type, with new parameters
describing the switch buffer memory.
* Bug in ttCallBlockSystem fixed
* ttmex command added
TrueTime 1.12, 2003-08-06
=========================
* Minor bug workaround for Matlab 6.1 (R12.1) added
TrueTime 1.11, 2003-06-24
=========================
* Support for several network blocks in the same model
* Improved error-handling, fail-safe execution flag removed
* Common version for both Matlab 6.1 (R12.1) and Matlab 6.5 (R13)
TrueTime 1.1, 2003-03-28
=========================
* Major new release, new syntax
TrueTime 1.0, 2002-07-18
========================
* First release of TrueTime