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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2014-12-12 10:07:09 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2014-12-12 10:07:09 +0000 |
| commit | dffdc36d577c70bac7bf172f00c55aabf173340a (patch) | |
| tree | 10dd28a59f0c2aede96330f1166134fdc0fe9c6d /os/hal/dox/main.dox | |
| parent | e023f0058dcb36075f3a51072593aeff334eff3c (diff) | |
| download | ChibiOS-dffdc36d577c70bac7bf172f00c55aabf173340a.tar.gz ChibiOS-dffdc36d577c70bac7bf172f00c55aabf173340a.tar.bz2 ChibiOS-dffdc36d577c70bac7bf172f00c55aabf173340a.zip | |
Added OSAL documentation to HAL document. Fixed typos in the various OSALs.
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7573 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/dox/main.dox')
| -rw-r--r-- | os/hal/dox/main.dox | 64 |
1 files changed, 62 insertions, 2 deletions
diff --git a/os/hal/dox/main.dox b/os/hal/dox/main.dox index a704c9c90..a8d0f9a20 100644 --- a/os/hal/dox/main.dox +++ b/os/hal/dox/main.dox @@ -21,9 +21,9 @@ /**
* @defgroup IO HAL
* @brief Hardware Abstraction Layer.
- * @details Under ChibiOS/RT the set of the various device driver interfaces
+ * @details Under ChibiOS the set of the various device driver interfaces
* is called the HAL subsystem: Hardware Abstraction Layer. The HAL is the
- * abstract interface between ChibiOS/RT application and hardware.
+ * abstract interface between ChibiOS applications and hardware.
*
* @section hal_device_driver_arch HAL Device Drivers Architecture
* The HAL contains several kind of modules:
@@ -130,3 +130,63 @@ *
* @ingroup IO
*/
+
+/**
+ * @defgroup OSAL OSAL
+ * @brief Operating System Abstraction Layer.
+ * @details <h2>The OSAL</h2>
+ * The OSAL is the link between ChibiOS/HAL and services
+ * provided by operating systems like:
+ * - Critical Zones handling.
+ * - Interrupts handling.
+ * - Runtime Errors management.
+ * - Inter-task synchronization.
+ * - Task-ISR synchronization.
+ * - Time management.
+ * - Events.
+ * .
+ * ChibiOS/HAL is designed to tightly integrate with the underlying
+ * RTOS in order to provide the best experience to developers and
+ * minimize integration issues.<br>
+ * This section describes the API that OSALs are expected to expose
+ * to the HAL.
+ *
+ * <h2>RTOS Requirements</h2>
+ * The OSAL API closely resembles the ChibiOS/RT API, for obvious
+ * reasons, however an OSAL module can be implemented for any
+ * reasonably complete RTOS or even a RTOS-less bare metal
+ * machine, if required.<br>
+ * In order to be able to support an HAL an RTOS should support the
+ * following minimal set of features:
+ * - Task-level critical zones API.
+ * - ISR-level critical zones API, only required on those CPU
+ * architectures supporting preemptable ISRs like Cortex-Mx
+ * cores.
+ * - Ability to invoke API functions from inside a task critical
+ * zone. Functions that are required to support this feature are
+ * marked with an "I" or "S" letter at the end of the name.
+ * - Ability to invoke API functions from inside an ISR critical
+ * zone. Functions that are required to support this feature are
+ * marked with an "I" letter at the end of the name.
+ * - Tasks Queues or Counting Semaphores with Timeout capability.
+ * - Ability to suspend a task and wakeup it from ISR with Timeout
+ * capability.
+ * - Event flags, the mechanism can be simulated using callbacks in
+ * case the RTOS does not support it.
+ * - Mutual Exclusion mechanism like Semaphores or Mutexes.
+ * .
+ * All the above requirements can be satisfied even on naked HW with
+ * a very think SW layer. In case that the HAL is required to work
+ * without an RTOS.
+ *
+ * <h2>Supported RTOSes</h2>
+ * The RTOSes supported out of the box are:
+ * - ChibiOS/RT
+ * - ChibiOS/NIL
+ * .
+ * Implementations have also been successfully created on RTOSes not
+ * belonging to the ChibiOS products family but are not supported
+ * as a core feature of ChibiOS/HAL.
+ *
+ * @ingroup IO
+ */
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