Commit graph

6 commits

Author SHA1 Message Date
Joe Finney 9218e647e0 microbit: Refactor of periodc timer callbacks
- Factored periodic timer funcitonality out of fiber scheduler and into a new SystemTimer module module.
- Enapsulated "ticks" variable within SystemTimer module, with accessor funciton.
- Added accessor/mutator functions to get and set the tick period.
- Added a class wrapper to permit periodic callbacks to both C and C++
  functions.
- Updated all references in microbit-dal to use this refactored API.
2016-03-10 17:01:17 +00:00
Joe Finney 000351b599 Factored idle/interrupt callback events out of MicroBit.cpp 2016-03-10 12:02:15 +00:00
Joe Finney 5231b5f526 First cut at a build without a global MicroBit singleton 2016-03-10 12:02:13 +00:00
Joe Finney 3395f66d3d microbit: Added configurable event processing options into MicroBitEvent
Events in the micro:bit runtime are normally launched through making an instance
of the MicroBitEvent class. This update added configuration support to all the
code creating the MicroBitEvent decide if the newly created event should then be
automatically queued on the MessageBus or processed immediately by event handlers.
2015-09-12 11:34:16 +01:00
Joe Finney a875d5fccd microbit: Added configurable concurrency modes for MicroBitMessageBus handlers.
MessageBus handlers can now have one of four concurrency modes for the eventuality
of an event being raised whilst a previous event is still being processed. An additional
(optional) parameter is provided to the listen() functions to allow this to be selected
on a per event handler basis. The permissable options are:

MESSAGE_BUS_LISTENER_REENTRANT:
The event handler is fired with the new event, regardless of whether or not
a previous event is still be processed by that handler.

MESSAGE_BUS_LISTENER_QUEUE_IF_BUSY:
The new event is queued until such a time as the previous event has completed
execution. The new event is then processed. This option does not preclude the
processing of the new event by other event handlers.

MESSAGE_BUS_LISTENER_DROP_IF_BUSY:
The new event is dropped, and will never be processed the the event handler.
This option does not preclude the processing of the new event by other event handlers.

MESSAGE_BUS_LISTENER_NONBLOCKING:
The event handler is self-declaring that it never blocks. This flag is used purely
for optimisation, as it permits direct execution of the event hadnelr without inducing
any overhead from the scheduler.

In addition, the following minor revisions were made in this release:

* Cleanup of the #include dependencies contained in the microbit-dal .h files
* Bugfix to the scheduler block on event matching code.
* Introduced a MICROBIT_ID_ALERT MessageBus channel, for general purpose eventing using nonces.
2015-09-11 16:39:38 +01:00
James Devine 538e1c48bd microbit-dal: Initial Commit
This is the first commit of the microbit-dal on GitHub.
This repository contains the runtime, which is a light
weight operating system developed by Lancaster University.
2015-08-12 11:53:41 +01:00