diff options
Diffstat (limited to 'include/gtimer/gtimer.h')
-rw-r--r-- | include/gtimer/gtimer.h | 308 |
1 files changed, 164 insertions, 144 deletions
diff --git a/include/gtimer/gtimer.h b/include/gtimer/gtimer.h index acdda990..7d7747d4 100644 --- a/include/gtimer/gtimer.h +++ b/include/gtimer/gtimer.h @@ -4,147 +4,167 @@ * * http://chibios-gfx.com/license.html */ -
-#ifndef _GTIMER_H
-#define _GTIMER_H
-
-#include "gfx.h"
-
-#if GFX_USE_GTIMER || defined(__DOXYGEN__)
-
-/*===========================================================================*/
-/* Type definitions */
-/*===========================================================================*/
-
-/* Data part of a static GTimer initialiser */
-#define _GTIMER_DATA() {0,0,0,0,0,0,0}
-
-/* Static GTimer initialiser */
-#define GTIMER_DECL(name) GTimer name = _GTIMER_DATA()
-
-/* A callback function (executed in a thread context) */
-typedef void (*GTimerFunction)(void *param);
-
-/**
- * @brief A GTimer structure
- */
-typedef struct GTimer_t {
- GTimerFunction fn;
- void *param;
- systime_t when;
- systime_t period;
- uint16_t flags;
- struct GTimer_t *next;
- struct GTimer_t *prev;
-} GTimer;
-
-/*===========================================================================*/
-/* External declarations. */
-/*===========================================================================*/
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @brief Initialise a timer.
- *
- * @param[in] pt pointer to a GTimer structure
- *
- * @api
- */
-void gtimerInit(GTimer *pt);
-
-/**
- * @brief Set a timer going or alter its properties if it is already going.
- *
- * @param[in] pt Pointer to a GTimer structure
- * @param[in] fn The callback function
- * @param[in] param The parameter to pass to the callback function
- * @param[in] periodic Is the timer a periodic timer? FALSE is a once-only timer.
- * @param[in] millisec The timer period. The following special values are allowed:
- * TIME_IMMEDIATE causes the callback function to be called asap.
- * A periodic timer with this value will fire once only.
- * TIME_INFINITE never timeout (unless triggered by gtimerJab or gtimerJabI)
- *
- * @note If the timer is already active its properties are updated with the new parameters.
- * The current period will be immediately canceled (without the callback function being
- * called) and the timer will be restart with the new timer properties.
- * @note The callback function should be careful not to over-run the thread stack.
- * Define a new value for the macro GTIME_THREAD_STACK_SIZE if you want to
- * change the default size.
- * @note The callback function should return as quickly as possible as all
- * timer callbacks are performed by a single thread. If a callback function
- * takes too long it could affect the timer response for other timers.
- * @note A timer callback function is not a replacement for a dedicated thread if the
- * function wants to perform computationally expensive stuff.
- * @note As the callback function is called on GTIMER's thread, the function must make sure it uses
- * appropriate synchronisation controls such as semaphores or mutexes around any data
- * structures it shares with other threads such as the main application thread.
- *
- * @api
- */
-void gtimerStart(GTimer *pt, GTimerFunction fn, void *param, bool_t periodic, systime_t millisec);
-
-/**
- * @brief Stop a timer (periodic or otherwise)
- *
- * @param[in] pt Pointer to a GTimer structure
- *
- * @note If the timer is not active this does nothing.
- *
- * @api
- */
-void gtimerStop(GTimer *pt);
-
-/**
- * @brief Test if a timer is currently active
- *
- * @param[in] pt Pointer to a GTimer structure
- *
- * @return TRUE if active, FALSE otherwise
- *
- * @api
- */
-bool_t gtimerIsActive(GTimer *pt);
-
-/**
- * @brief Jab a timer causing the current period to immediate expire
- * @details The callback function will be called as soon as possible.
- *
- * @pre Use from a normal thread context.
- *
- * @param[in] pt Pointer to a GTimer structure
- *
- * @note If the timer is not active this does nothing.
- * @note Repeated Jabs before the callback function actually happens are ignored.
- *
- * @api
- */
-void gtimerJab(GTimer *pt);
-
-/**
- * @brief Jab a timer causing the current period to immediate expire
- * @details The callback function will be called as soon as possible.
- *
- * @pre Use from an interrupt routine context.
- *
- * @param[in] pt Pointer to a GTimer structure
- *
- * @note If the timer is not active this does nothing.
- * @note Repeated Jabs before the callback function actually happens are ignored.
- *
- * @iclass
- * @api
- */
-void gtimerJabI(GTimer *pt);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* GFX_USE_GTIMER */
-
-#endif /* _GTIMER_H */
-/** @} */
-
+ +/** + * @file include/gtimer/gtimer.h + * @brief GTIMER GFX User Timer subsystem header file. + * + * @addtogroup GTIMER + * + * @details The reason why ChibiOS/GFX has it's own timer abstraction is because + * virtual timers provided by ChibiOS/RT are interrupt context only. + * While great for what they are designed for, they make coding of the input + * drivers much more complex. + * For non-performance critical drivers like these input drivers, it would also + * hog an in-ordinate amount of critical (interrupt locked) system time. + * This contrary to the goals of a real-time operating system. So a user-land + * (thread based) timer mechanism is also required. + * + * @pre GFX_USE_GTIMER must be set to TRUE in your gfxconf.h + * + * @{ + */ + +#ifndef _GTIMER_H +#define _GTIMER_H + +#include "gfx.h" + +#if GFX_USE_GTIMER || defined(__DOXYGEN__) + +/*===========================================================================*/ +/* Type definitions */ +/*===========================================================================*/ + +/* Data part of a static GTimer initialiser */ +#define _GTIMER_DATA() {0,0,0,0,0,0,0} + +/* Static GTimer initialiser */ +#define GTIMER_DECL(name) GTimer name = _GTIMER_DATA() + +/* A callback function (executed in a thread context) */ +typedef void (*GTimerFunction)(void *param); + +/** + * @brief A GTimer structure + */ +typedef struct GTimer_t { + GTimerFunction fn; + void *param; + systime_t when; + systime_t period; + uint16_t flags; + struct GTimer_t *next; + struct GTimer_t *prev; +} GTimer; + +/*===========================================================================*/ +/* External declarations. */ +/*===========================================================================*/ + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * @brief Initialise a timer. + * + * @param[in] pt pointer to a GTimer structure + * + * @api + */ +void gtimerInit(GTimer *pt); + +/** + * @brief Set a timer going or alter its properties if it is already going. + * + * @param[in] pt Pointer to a GTimer structure + * @param[in] fn The callback function + * @param[in] param The parameter to pass to the callback function + * @param[in] periodic Is the timer a periodic timer? FALSE is a once-only timer. + * @param[in] millisec The timer period. The following special values are allowed: + * TIME_IMMEDIATE causes the callback function to be called asap. + * A periodic timer with this value will fire once only. + * TIME_INFINITE never timeout (unless triggered by gtimerJab or gtimerJabI) + * + * @note If the timer is already active its properties are updated with the new parameters. + * The current period will be immediately canceled (without the callback function being + * called) and the timer will be restart with the new timer properties. + * @note The callback function should be careful not to over-run the thread stack. + * Define a new value for the macro GTIME_THREAD_STACK_SIZE if you want to + * change the default size. + * @note The callback function should return as quickly as possible as all + * timer callbacks are performed by a single thread. If a callback function + * takes too long it could affect the timer response for other timers. + * @note A timer callback function is not a replacement for a dedicated thread if the + * function wants to perform computationally expensive stuff. + * @note As the callback function is called on GTIMER's thread, the function must make sure it uses + * appropriate synchronisation controls such as semaphores or mutexes around any data + * structures it shares with other threads such as the main application thread. + * + * @api + */ +void gtimerStart(GTimer *pt, GTimerFunction fn, void *param, bool_t periodic, systime_t millisec); + +/** + * @brief Stop a timer (periodic or otherwise) + * + * @param[in] pt Pointer to a GTimer structure + * + * @note If the timer is not active this does nothing. + * + * @api + */ +void gtimerStop(GTimer *pt); + +/** + * @brief Test if a timer is currently active + * + * @param[in] pt Pointer to a GTimer structure + * + * @return TRUE if active, FALSE otherwise + * + * @api + */ +bool_t gtimerIsActive(GTimer *pt); + +/** + * @brief Jab a timer causing the current period to immediate expire + * @details The callback function will be called as soon as possible. + * + * @pre Use from a normal thread context. + * + * @param[in] pt Pointer to a GTimer structure + * + * @note If the timer is not active this does nothing. + * @note Repeated Jabs before the callback function actually happens are ignored. + * + * @api + */ +void gtimerJab(GTimer *pt); + +/** + * @brief Jab a timer causing the current period to immediate expire + * @details The callback function will be called as soon as possible. + * + * @pre Use from an interrupt routine context. + * + * @param[in] pt Pointer to a GTimer structure + * + * @note If the timer is not active this does nothing. + * @note Repeated Jabs before the callback function actually happens are ignored. + * + * @iclass + * @api + */ +void gtimerJabI(GTimer *pt); + +#ifdef __cplusplus +} +#endif + +#endif /* GFX_USE_GTIMER */ + +#endif /* _GTIMER_H */ +/** @} */ + |