Replace blind interface descriptor search in the incomplete AndroidAccessoryHost...

[pub/USBasp.git] / LUFA / Scheduler / Scheduler.h

diff --git a/LUFA/Scheduler/Scheduler.h b/LUFA/Scheduler/Scheduler.h
index ce2cbb1..2622186 100644 (file)
--- a/LUFA/Scheduler/Scheduler.h
+++ b/LUFA/Scheduler/Scheduler.h
@@ -1,21 +1,21 @@
 /*
              LUFA Library
 /*
              LUFA Library

-     Copyright (C) Dean Camera, 2010.
-              
+     Copyright (C) Dean Camera, 2011.
+

   dean [at] fourwalledcubicle [dot] com
   dean [at] fourwalledcubicle [dot] com

-      www.fourwalledcubicle.com
+           www.lufa-lib.org

 */
 
 /*
 */
 
 /*

-  Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
+  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)

 
 

-  Permission to use, copy, modify, distribute, and sell this 
+  Permission to use, copy, modify, distribute, and sell this

   software and its documentation for any purpose is hereby granted
   software and its documentation for any purpose is hereby granted

-  without fee, provided that the above copyright notice appear in 
+  without fee, provided that the above copyright notice appear in

   all copies and that both that the copyright notice and this
   all copies and that both that the copyright notice and this

-  permission notice and warranty disclaimer appear in supporting 
-  documentation, and that the name of the author not be used in 
-  advertising or publicity pertaining to distribution of the 
+  permission notice and warranty disclaimer appear in supporting
+  documentation, and that the name of the author not be used in
+  advertising or publicity pertaining to distribution of the

   software without specific, written prior permission.
 
   The author disclaim all warranties with regard to this
   software without specific, written prior permission.
 
   The author disclaim all warranties with regard to this


@@ -36,8 +36,9 @@
  *
  *  \deprecated This module is deprecated and will be removed in a future library release.
  */
  *
  *  \deprecated This module is deprecated and will be removed in a future library release.
  */

- 
-/** @defgroup Group_Scheduler Simple Task Scheduler - LUFA/Scheduler/Scheduler.h
+
+/** \defgroup Group_Scheduler Simple Task Scheduler - LUFA/Scheduler/Scheduler.h
+ *  \brief Simple round-robbin pseudo-task scheduler.

  *
  *  \deprecated This module is deprecated and will be removed in a future library release.
  *
  *
  *  \deprecated This module is deprecated and will be removed in a future library release.
  *


@@ -45,53 +46,66 @@
  *  The following files must be built with any user project that uses this module:
  *    - LUFA/Scheduler/Scheduler.c <i>(Makefile source module name: LUFA_SRC_SCHEDULER)</i>
  *
  *  The following files must be built with any user project that uses this module:
  *    - LUFA/Scheduler/Scheduler.c <i>(Makefile source module name: LUFA_SRC_SCHEDULER)</i>
  *

- *  \section Module Description
+ *  \section Sec_ModDescription Module Description

  *  Simple round-robbin cooperative scheduler for use in basic projects where non real-time tasks need
  *  to be executed. Each task is executed in sequence, and can be enabled or disabled individually or as a group.
  *
  *  Simple round-robbin cooperative scheduler for use in basic projects where non real-time tasks need
  *  to be executed. Each task is executed in sequence, and can be enabled or disabled individually or as a group.
  *

- *  For a task to yield it must return, thus each task should have persistent data marked with the static attribute.
+ *  For a task to yield it must \c return, thus each task should have persistent data marked with the \c static keyword.
+ *
+ *  Each LUFA scheduler task should be written similar to an ISR; it should execute quickly (so that no one task
+ *  hogs the processor, preventing another from running before some sort of timeout is exceeded). Unlike normal RTOS
+ *  tasks, each LUFA scheduler task is a regular function, and thus must be designed to be called, and designed to
+ *  return to the calling scheduler function repeatedly. Data which must be preserved between task calls should be
+ *  declared as global or (preferably) as a \c static local variable inside the task.
+ *
+ *  The scheduler consists of a task list, listing all the tasks which can be executed by the scheduler. Once started,
+ *  each task is then called one after another, unless the task is stopped by another running task or interrupt.

  *
  *  Usage Example:
  *  \code
  *      #include <LUFA/Scheduler/Scheduler.h>
  *
  *  Usage Example:
  *  \code
  *      #include <LUFA/Scheduler/Scheduler.h>

- *      
- *      TASK(MyTask1);
- *      TASK(MyTask2);
- *      
+ *
+ *      TASK(MyTask1); // Task prototype
+ *      TASK(MyTask2); // Task prototype
+ *

  *      TASK_LIST
  *      {
  *      TASK_LIST
  *      {

- *             { .Task = MyTask1, .TaskStatus = TASK_RUN, .GroupID = 1  },
- *             { .Task = MyTask2, .TaskStatus = TASK_RUN, .GroupID = 1  },
+ *          { .Task = MyTask1, .TaskStatus = TASK_RUN, .GroupID = 1  },
+ *          { .Task = MyTask2, .TaskStatus = TASK_RUN, .GroupID = 1  },

  *      }
  *
  *      int main(void)
  *      {
  *      }
  *
  *      int main(void)
  *      {

- *             Scheduler_Start();
+ *          Scheduler_Init();
+ *
+ *          // Other initialisation here
+ *
+ *          Scheduler_Start();

  *      }
  *
  *      TASK(MyTask1)
  *      {
  *      }
  *
  *      TASK(MyTask1)
  *      {

- *             // Implementation Here
+ *          // Task implementation here

  *      }
  *
  *      TASK(MyTask2)
  *      {
  *      }
  *
  *      TASK(MyTask2)
  *      {

- *             // Implementation Here
+ *          // Task implementation here

  *      }
  *  \endcode
  *
  *      }
  *  \endcode
  *

+ *  If desired, the LUFA scheduler <b>does not need to be used</b> in a LUFA powered application. A more conventional
+ *  approach to application design can be used, or a proper scheduling RTOS inserted in the place of the LUFA scheduler.
+ *  In the case of the former the USB task must be run manually repeatedly to maintain USB communications, and in the
+ *  case of the latter a proper RTOS task must be set up to do the same.
+ *

  *  @{
  */
  *  @{
  */

- 
+

 #ifndef __SCHEDULER_H__
 #define __SCHEDULER_H__
 
        /* Includes: */
 #ifndef __SCHEDULER_H__
 #define __SCHEDULER_H__
 
        /* Includes: */

-               #include <avr/io.h>
-               #include <stdbool.h>
-               
-               #include <util/atomic.h>
-

                #include "../Common/Common.h"
 
        /* Enable C linkage for C++ Compilers: */
                #include "../Common/Common.h"
 
        /* Enable C linkage for C++ Compilers: */


@@ -112,8 +126,8 @@
                         *  \endcode
                         */
                        #define TASK(name)              void name (void)
                         *  \endcode
                         */
                        #define TASK(name)              void name (void)

-                       
-                       /** Defines a task list array, containing one or more task entries of the type TaskEntry_t. Each task list
+
+                       /** Defines a task list array, containing one or more task entries of the type \ref TaskEntry_t. Each task list

                         *  should be encased in curly braces and ended with a comma.
                         *
                         *  Usage Example:
                         *  should be encased in curly braces and ended with a comma.
                         *
                         *  Usage Example:


@@ -125,8 +139,8 @@
                         *      }
                         *  \endcode
                         */
                         *      }
                         *  \endcode
                         */

-                       #define TASK_LIST               TaskEntry_t Scheduler_TaskList[] = 
-                       
+                       #define TASK_LIST               TaskEntry_t Scheduler_TaskList[] =
+

                        /** Constant, giving the maximum delay in scheduler ticks which can be stored in a variable of type
                         *  \ref SchedulerDelayCounter_t.
                         */
                        /** Constant, giving the maximum delay in scheduler ticks which can be stored in a variable of type
                         *  \ref SchedulerDelayCounter_t.
                         */


@@ -137,16 +151,16 @@
 
                        /** Task status mode constant, for passing to \ref Scheduler_SetTaskMode() or \ref Scheduler_SetGroupTaskMode(). */
                        #define TASK_STOP               false
 
                        /** Task status mode constant, for passing to \ref Scheduler_SetTaskMode() or \ref Scheduler_SetGroupTaskMode(). */
                        #define TASK_STOP               false

-                       
+

                /* Pseudo-Function Macros: */
                        #if defined(__DOXYGEN__)
                                /** Starts the scheduler in its infinite loop, executing running tasks. This should be placed at the end
                /* Pseudo-Function Macros: */
                        #if defined(__DOXYGEN__)
                                /** Starts the scheduler in its infinite loop, executing running tasks. This should be placed at the end

-                                *  of the user application's main() function, as it can never return to the calling function.
+                                *  of the user application's \c main() function, as it can never return to the calling function.

                                 */
                                void Scheduler_Start(void);
                                 */
                                void Scheduler_Start(void);

-                               
-                               /** Initializes the scheduler so that the scheduler functions can be called before the scheduler itself
-                                *  is started. This must be executed before any scheduler function calls other than Scheduler_Start(),
+
+                               /** Initialises the scheduler so that the scheduler functions can be called before the scheduler itself
+                                *  is started. This must be executed before any scheduler function calls other than \ref Scheduler_Start(),

                                 *  and can be omitted if no such functions could be called before the scheduler is started.
                                 */
                                void Scheduler_Init(void);
                                 *  and can be omitted if no such functions could be called before the scheduler is started.
                                 */
                                void Scheduler_Init(void);


@@ -158,36 +172,36 @@
                /* Type Defines: */
                        /** Type define for a pointer to a scheduler task. */
                        typedef void (*TaskPtr_t)(void);
                /* Type Defines: */
                        /** Type define for a pointer to a scheduler task. */
                        typedef void (*TaskPtr_t)(void);

-                       
+

                        /** Type define for a variable which can hold a tick delay value for the scheduler up to the maximum delay
                         *  possible.
                         */
                        /** Type define for a variable which can hold a tick delay value for the scheduler up to the maximum delay
                         *  possible.
                         */

-                       typedef uint16_t SchedulerDelayCounter_t;
-                       
+                       typedef uint_least16_t SchedulerDelayCounter_t;
+

                        /** \brief Scheduler Task List Entry Structure.
                         *
                         *  Structure for holding a single task's information in the scheduler task list.
                         */
                        typedef struct
                        {
                        /** \brief Scheduler Task List Entry Structure.
                         *
                         *  Structure for holding a single task's information in the scheduler task list.
                         */
                        typedef struct
                        {

-                               TaskPtr_t Task;       /**< Pointer to the task to execute. */
-                               bool      TaskStatus; /**< Status of the task (either TASK_RUN or TASK_STOP). */
-                               uint8_t   GroupID;    /**< Group ID of the task so that its status can be changed as a group. */
-                       } TaskEntry_t;                  
+                               TaskPtr_t     Task;       /**< Pointer to the task to execute. */
+                               bool          TaskStatus; /**< Status of the task (either TASK_RUN or TASK_STOP). */
+                               uint_least8_t GroupID;    /**< Group ID of the task so that its status can be changed as a group. */
+                       } TaskEntry_t;

 
                /* Global Variables: */
                        /** Task entry list, containing the scheduler tasks, task statuses and group IDs. Each entry is of type
 
                /* Global Variables: */
                        /** Task entry list, containing the scheduler tasks, task statuses and group IDs. Each entry is of type

-                        *  TaskEntry_t and can be manipulated as desired, although it is preferential that the proper Scheduler
+                        *  \ref TaskEntry_t and can be manipulated as desired, although it is preferred that the proper Scheduler

                         *  functions should be used instead of direct manipulation.
                         */
                         *  functions should be used instead of direct manipulation.
                         */

-                       exter TaskEntry_t Scheduler_TaskList[];
-                       
+                       extern TaskEntry_t Scheduler_TaskList[];
+

                        /** Contains the total number of tasks in the task list, irrespective of if the task's status is set to
                         *  \ref TASK_RUN or \ref TASK_STOP.
                         *
                         *  \note This value should be treated as read-only, and never altered in user-code.
                         */
                        /** Contains the total number of tasks in the task list, irrespective of if the task's status is set to
                         *  \ref TASK_RUN or \ref TASK_STOP.
                         *
                         *  \note This value should be treated as read-only, and never altered in user-code.
                         */

-                       extern volatile uint8_t Scheduler_TotalTasks;
+                       extern volatile uint_least8_t Scheduler_TotalTasks;

 
                        /**  Contains the current scheduler tick count, for use with the delay functions. If the delay functions
                         *   are used in the user code, this should be incremented each tick period so that the delays can be
 
                        /**  Contains the current scheduler tick count, for use with the delay functions. If the delay functions
                         *   are used in the user code, this should be incremented each tick period so that the delays can be


@@ -205,24 +219,26 @@
                                                                ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
                        static inline void Scheduler_ResetDelay(SchedulerDelayCounter_t* const DelayCounter)
                        {
                                                                ATTR_NON_NULL_PTR_ARG(1) ATTR_ALWAYS_INLINE;
                        static inline void Scheduler_ResetDelay(SchedulerDelayCounter_t* const DelayCounter)
                        {

-                               ATOMIC_BLOCK(ATOMIC_RESTORESTATE)
-                               {
-                                       *DelayCounter = Scheduler_TickCounter;
-                               }
+                               uint_reg_t CurrentGlobalInt = GetGlobalInterruptMask();
+                               GlobalInterruptDisable();
+
+                               *DelayCounter = Scheduler_TickCounter;
+
+                               SetGlobalInterruptMask(CurrentGlobalInt);

                        }
                        }

-               
+

                /* Function Prototypes: */
                        /** Determines if the given tick delay has elapsed, based on the given delay period and tick counter value.
                         *
                         *  \param[in] Delay         The delay to test for, measured in ticks.
                         *  \param[in] DelayCounter  The counter which is storing the starting tick value for the delay.
                         *
                /* Function Prototypes: */
                        /** Determines if the given tick delay has elapsed, based on the given delay period and tick counter value.
                         *
                         *  \param[in] Delay         The delay to test for, measured in ticks.
                         *  \param[in] DelayCounter  The counter which is storing the starting tick value for the delay.
                         *

-                        *  \return Boolean true if the delay has elapsed, false otherwise.
+                        *  \return Boolean \c true if the delay has elapsed, \c false otherwise.

                         *
                         *  Usage Example:
                         *  \code
                         *      static SchedulerDelayCounter_t DelayCounter = 10000; // Force immediate run on start-up
                         *
                         *  Usage Example:
                         *  \code
                         *      static SchedulerDelayCounter_t DelayCounter = 10000; // Force immediate run on start-up

-                        *                               
+                        *

                         *      // Task runs every 10000 ticks, 10 seconds for this demo
                         *      if (Scheduler_HasDelayElapsed(10000, &DelayCounter))
                         *      {
                         *      // Task runs every 10000 ticks, 10 seconds for this demo
                         *      if (Scheduler_HasDelayElapsed(10000, &DelayCounter))
                         *      {


@@ -230,47 +246,50 @@
                         *      }
                         *  \endcode
                         */
                         *      }
                         *  \endcode
                         */

-                       bool Scheduler_HasDelayElapsed(const uint16_t Delay,
+                       bool Scheduler_HasDelayElapsed(const uint_least16_t Delay,

                                                       SchedulerDelayCounter_t* const DelayCounter)
                                                       SchedulerDelayCounter_t* const DelayCounter)

-                                                                                  ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(2);
-                       
+                                                      ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(2);
+

                        /** Sets the task mode for a given task.
                         *
                         *  \param[in] Task        Name of the task whose status is to be changed.
                         *  \param[in] TaskStatus  New task status for the task (\ref TASK_RUN or \ref TASK_STOP).
                         */
                        /** Sets the task mode for a given task.
                         *
                         *  \param[in] Task        Name of the task whose status is to be changed.
                         *  \param[in] TaskStatus  New task status for the task (\ref TASK_RUN or \ref TASK_STOP).
                         */

-                       void Scheduler_SetTaskMode(const TaskPtr_t Task, const bool TaskStatus);
-                       
+                       void Scheduler_SetTaskMode(const TaskPtr_t Task,
+                                                  const bool TaskStatus);
+

                        /** Sets the task mode for a given task group ID, allowing for an entire group of tasks to have their
                         *  statuses changed at once.
                         *
                         *  \param[in] GroupID     Value of the task group ID whose status is to be changed.
                         *  \param[in] TaskStatus  New task status for tasks in the specified group (\ref TASK_RUN or \ref TASK_STOP).
                         */
                        /** Sets the task mode for a given task group ID, allowing for an entire group of tasks to have their
                         *  statuses changed at once.
                         *
                         *  \param[in] GroupID     Value of the task group ID whose status is to be changed.
                         *  \param[in] TaskStatus  New task status for tasks in the specified group (\ref TASK_RUN or \ref TASK_STOP).
                         */

-                       void Scheduler_SetGroupTaskMode(const uint8_t GroupID, const bool TaskStatus);
+                       void Scheduler_SetGroupTaskMode(const uint_least8_t GroupID,
+                                                       const bool TaskStatus);

 
 

-       /* Private Interface - For use in library only: */              
+       /* Private Interface - For use in library only: */

        #if !defined(__DOXYGEN__)
                /* Macros: */
                        #define TOTAL_TASKS                       (sizeof(Scheduler_TaskList) / sizeof(TaskEntry_t))
        #if !defined(__DOXYGEN__)
                /* Macros: */
                        #define TOTAL_TASKS                       (sizeof(Scheduler_TaskList) / sizeof(TaskEntry_t))

-                       #define MAX_DELAYCTR_COUNT                0xFFFF
+                       #define MAX_DELAYCTR_COUNT                UINT_LEAST16_MAX

 
                /* Inline Functions: */
 
                /* Inline Functions: */

-                       static inline void Scheduler_InitScheduler(const uint8_t TotalTasks) ATTR_ALWAYS_INLINE;
-                       static inline void Scheduler_InitScheduler(const uint8_t TotalTasks)
+                       static inline void Scheduler_InitScheduler(const uint_least8_t TotalTasks) ATTR_ALWAYS_INLINE;
+                       static inline void Scheduler_InitScheduler(const uint_least8_t TotalTasks)

                        {
                                Scheduler_TotalTasks = TotalTasks;
                        }
                        {
                                Scheduler_TotalTasks = TotalTasks;
                        }

-               
-                       static inline void Scheduler_GoSchedule(const uint8_t TotalTasks) ATTR_NO_RETURN ATTR_ALWAYS_INLINE ATTR_DEPRECATED;
-                       static inline void Scheduler_GoSchedule(const uint8_t TotalTasks)
+
+                       static inline void Scheduler_GoSchedule(const uint_least8_t TotalTasks)
+                                                               ATTR_NO_RETURN ATTR_ALWAYS_INLINE ATTR_DEPRECATED;
+                       static inline void Scheduler_GoSchedule(const uint_least8_t TotalTasks)

                        {
                                Scheduler_InitScheduler(TotalTasks);
 
                                for (;;)
                                {
                                        TaskEntry_t* CurrTask = &Scheduler_TaskList[0];
                        {
                                Scheduler_InitScheduler(TotalTasks);
 
                                for (;;)
                                {
                                        TaskEntry_t* CurrTask = &Scheduler_TaskList[0];

-                                       
+

                                        while (CurrTask != &Scheduler_TaskList[TotalTasks])
                                        {
                                                if (CurrTask->TaskStatus == TASK_RUN)
                                        while (CurrTask != &Scheduler_TaskList[TotalTasks])
                                        {
                                                if (CurrTask->TaskStatus == TASK_RUN)


@@ -281,12 +300,13 @@
                                }
                        }
        #endif
                                }
                        }
        #endif

-               
+

        /* Disable C linkage for C++ Compilers: */
                #if defined(__cplusplus)
                        }
                #endif
        /* Disable C linkage for C++ Compilers: */
                #if defined(__cplusplus)
                        }
                #endif

-               
+

 #endif
 
 /** @} */
 #endif
 
 /** @} */

+