git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@5 35acf78f-673a-0410-8e92-d51de3d6d3f4

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gdisirio 2007-09-18 12:27:36 +00:00
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/**
* @mainpage ChibiOS/RT
* @author Giovanni Di Sirio (gdisirio@chibios.sourceforge.net).
* @section Chibi Chibi ?
* It is the Japanese word for small as in small child. So ChibiOS/RT
* \htmlonly (<span class="t_nihongo_kanji" xml:lang="ja" lang="ja">&#12385;&#12403;</span>OS/RT) \endhtmlonly
* means small Real Time Operating System.
* Source <a href="http://en.wikipedia.org/wiki/Chibi" target="_blank">Wikipedia</a>.
* @section ch_features Features
* <ul>
* <li>Free software, GPL3 licensed.</li>
* <li>Designed for realtime applications.</li>
* <li>Easily portable.</li>
* <li>Mixed programming model:</li>
* <ul>
* <li>Synchronous, using semaphores and/or messages.</li>
* <li>Asynchronous, using event sources.</li>
* <li>Mix of the above models, multiple threads listening to multiple event
* sources while serving message queues.</li>
* </ul>
* <li>PC simulator target included, the development can be done on the PC
* using MinGW or VS.
* Timers, I/O channels and other HW resources are simulated in a
* Win32 process and the application code does not need to be aware of it.
* MinGW and VS demos available and ready to go, use them as templates for
* your application.</li>
* <li>Unlimited number of threads.</li>
* <li>Unlimited number of virtual timers.</li>
* <li>Unlimited number of semaphores.</li>
* <li>Unlimited number of event sources.</li>
* <li>Unlimited number of messages in queue.</li>
* <li>Unlimited number of I/O queues.</li>
* <li>No static setup at compile time, there is no need to configure a maximum
* number of all the above resources.</li>
* <li>No *need* for a memory allocator, all the kernel structures are static
* and declaratively allocated. A memory allocator can be used in your
* application but it is not required by the ChibiOS/RT itself.</li>
* <li>Threads, Semaphores, Event Sources, Virtual Timers creation/deletion at
* runtime.</li>
* <li>Blocking and non blocking I/O channels with timeout and events generation
* capability.</li>
* <li>Pre-emptive scheduling.</li>
* <li>Minimal system requirements: about 8KiB ROM with all options enabled and
* speed optimizations on. The size can shrink under 2KiB by disabling the
* the unused subsystems and optimizing for size.</li>
* <li>Small memory footprint, unused subsystems can be excluded by the
* memory image.</li>
* <li>Almost totally written in C with little ASM code required for ports.</li>
* </ul>
*/
/**
* @defgroup Kernel Kernel
* @{
*/
/** @} */
/**
* @defgroup Config Configuration
* @{
* In \p chconf.h are defined the required subsystems for your application.
* @ingroup Kernel
* @file chconf.h ChibiOS/RT configuration file.
*/
/** @} */
/**
* @defgroup Core Core
* @{
* Non portable code.
* @ingroup Kernel
* @file chcore.c Non portable code.
*/
/** @} */
/**
* @defgroup Initialization Initialization
* @{
* Initialization APIs and procedures.
* @ingroup Kernel
* @file ch.h ChibiOS/RT main include file, it includes everything else.
* @file chinit.c ChibiOS/RT Initialization code.
*/
/** @} */
/**
* @defgroup Scheduler Scheduler
* @{
* ChibiOS/RT scheduler.
* @ingroup Kernel
* @file chschd.c Scheduler code.
* @file scheduler.h Scheduler macros and structures.
*/
/** @} */
/**
* @defgroup Threads Threads
* @{
* Threads creation and termination APIs.
* @file threads.h Threads structures, macros and functions.
* @file chthreads.c Threads code.
*/
/** @} */
/**
* @defgroup VirtualTimers Virtual Timers
* @{
* Virtual Timers APIs.
* In order to use the Virtual Timers the \p CH_USE_VIRTUAL_TIMERS option
* must be specified in \p chconf.h.
* @file src/chdelta.c Virtual Timers code.
* @file delta.h Virtual Timers macros and structures.
*/
/** @} */
/**
* @defgroup Time Time
* @{
* Time related APIs.
* In order to use the Time APIs the \p CH_USE_SLEEP
* option must be specified in \p chconf.h.
* @file include/sleep.h Time macros and structures.
* @file chsleep.c Time functions.
*/
/** @} */
/**
* @defgroup Semaphores Semaphores
* @{
* Semaphores and threads synchronization.
* <b>Operation mode</b><br><br>
* A semaphore is a threads synchronization object, some operations
* are defined on semaphores:<br>
* <ul>
* <li><b>Signal</b>: The semaphore counter is increased and if the result
* is non-positive then a waiting thread is removed from the semaphore
* queue and made ready for execution.</li>
* <li><b>Wait</b>: The semaphore counter is decreased and if the result
* becomes negative the thread is queued in the semaphore and suspended.
* </li>
* <li><b>Reset</b>: The semaphore counter is reset to a non-negative value
* and all the threads in the queue are released.</li>
* </ul>
* Semaphores are mainly used as guards for mutual exclusion code zones but
* also have other uses, queues guards and counters as example.<br>
* In order to use the Semaphores APIs the \p CH_USE_SEMAPHORES
* option must be specified in \p chconf.h.<br><br>
* <b>Realtime Semaphores</b><br><br>
* The RT Semaphores work exactly like normal semaphores except that the
* thread gaining access to a mutex zone receives a priority boost, the
* priority is increased by \p MEPRIO and becomes higher than any thread that
* does not have the boost, note that all the boosted threads still keep their
* relative priorities.<br>
* Another difference is that the threads are queued by priority when trying
* to acquire RT semaphores, normal semaphores use a FIFO strategy.<br>
* The reason of this mechanism is to make the threads leave very critical
* guarded zones in a predictable time. Use this mechanism if your application
* has very strong realtime requirements.<br>
* In order to use the RT Semaphores APIs the \p CH_USE_RT_SEMAPHORES
* option must be specified in \p chconf.h.<br>
* This mechanism is <b>experimental</b>.
* @file semaphores.h Semaphores macros and structures.
* @file chsem.c Semaphores code.
*/
/** @} */
/**
* @defgroup Events Events
* @{
* Event Sources and Event Listeners.<br>
* <b>Operation mode</b><br><br>
* An Event Source is a special object that can be signaled by a thread or
* an interrupt service routine. Signaling an Event Source has the effect
* that all the threads registered on the Event Source will receive
* and serve the event.<br>
* An unlimited number of Event Sources can exists in a system and each
* thread can listen on an unlimited number of them.<br>
* Note that the events can be asynchronously generated but are synchronously
* served, a thread can serve event by calling the \p chEvtWait()
* API. If an event is generated while a listening thread is not ready to
* serve it then the event becomes "pending" and will be served as soon the
* thread invokes the \p chEvtWait().<br>
* In order to use the Event APIs the \p CH_USE_EVENTS option must be
* specified in \p chconf.h.
* @file events.h Events macros and structures.
* @file chevents.c Events functions.
*/
/** @} */
/**
* @defgroup Messages Messages
* @{
* Synchronous Messages.<br>
* <b>Operation Mode</b><br><br>
* Messages are an easy to use and fast IPC mechanism, threads can both serve
* messages and send messages to other threads, the mechanism allows data to
* be carryed in both directions. Data is not copyed between the client and
* server threads but just a pointer passed so the exchange is very time
* efficient.<br>
* Messages are always processed in FIFO order.<br>
* Threads do not need to allocate space for message queues, the mechanism
* just requires two extra pointers in the \p Thread structure (the message
* queue header).<br>
* In order to use the Messages APIs the \p CH_USE_MESSAGES option must be
* specified in \p chconf.h.
* @file messages.h Messages macros and structures.
* @file chmsg.c Messages functions.
*/
/** @} */
/**
* @defgroup IOQueues I/O Queues
* @{
* ChibiOS/RT supports several kinds of queues. The queues are mostly used
* in serial-like device drivers. The device drivers are usually designed to
* have a lower side (lower driver, it is usually an interrupt service
* routine) and an upper side (upper driver, accessed by the application
* threads).<br>
* There are several kind of queues:<br>
* <ul>
* <li><b>Input queue</b>, monodirectional queue where the writer is the
* lower side and the reader is the upper side.</li>
* <li><b>Output queue</b>, monodirectional queue where the writer is the
* upper side and the reader is the lower side.</li>
* <li><b>Half duplex queue</b>, bidirectional queue where the buffer is shared
* between a receive and a transmit queues. This means that concurrent
* buffered input and output operations are not possible, this is perfectly
* acceptable for a lot of applications however, as example an RS485 driver.
* <li><b>Full duplex queue</b>, bidirectional queue where read and write
* operations can happen at the same time. Full duplex queues
* are implemented by pairing an input queue and an output queue together.
* </ul>
* In order to use the I/O queues the \p CH_USE_QUEUES option must
* be specified in \p chconf.h.<br>
* In order to use the half duplex queues the \p CH_USE_QUEUES_HALFDUPLEX
* option must be specified in \p chconf.h.
* @file queues.h I/O Queues macros and structures.
* @file chqueues.c I/O Queues code.
*/
/** @} */
/**
* @defgroup Serial Serial Drivers
* @{
* This module implements a generic full duplex serial driver and a generic
* half duplex serial driver. It uses the I/O Queues for communication between
* the upper and the lower driver and events to notify the application about
* incoming data, outcoming data and other I/O events.
* The module also contains functions that make the implementation of the
* interrupt service routines much easier.<br>
* In order to use the serial full duplex driver the
* \p CH_USE_SERIAL_FULLDUPLEX option must be specified in \p chconf.h.<br>
* In order to use the serial half duplex driver the
* \p CH_USE_SERIAL_HALFDUPLEX option must be specified in \p chconf.h.
* @file serial.h Serial Drivers macros and structures.
* @file chserial.c Serial Drivers code.
*/
/** @} */