qpc/include/qs.h

/*****************************************************************************
* Product: QP/C
* Last Updated for Version: 5.2.0
* Date of the Last Update:  Nov 22, 2013
*
*                    Q u a n t u m     L e a P s
*                    ---------------------------
*                    innovating embedded systems
*
* Copyright (C) 2002-2013 Quantum Leaps, LLC. All rights reserved.
*
* This program is open source software: you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Alternatively, this program may be distributed and modified under the
* terms of Quantum Leaps commercial licenses, which expressly supersede
* the GNU General Public License and are specifically designed for
* licensees interested in retaining the proprietary status of their code.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Contact information:
* Quantum Leaps Web sites: http://www.quantum-leaps.com
*                          http://www.state-machine.com
* e-mail:                  info@quantum-leaps.com
*****************************************************************************/
#ifndef qs_h
#define qs_h

/**
* \file
* \ingroup qep qf qk qs
* \brief QS/C platform-independent public interface.
*
* This header file must be included directly or indirectly
* in all modules (*.c files) that use QS/C.
*/

#ifndef Q_SPY
    #error "Q_SPY must be defined to include qs.h"
#endif

/****************************************************************************/
/** \brief Quantum Spy record types.
*
* This enumeration specifies the record types used in the QP components.
* You can specify your own record types starting from ::QS_USER offset.
* Currently, the maximum of all records cannot exceed 256.
* \sa QS_filterIn()/QS_FILTER_ON and QS_filterOut()/QS_FILTER_OFF
*/
enum QSpyRecords {
    QS_QP_RESET,              /**< reset the QP (start of a new QS session) */

    /* [1] QEP records */
    QS_QEP_STATE_ENTRY,                            /**< a state was entered */
    QS_QEP_STATE_EXIT,                              /**< a state was exited */
    QS_QEP_STATE_INIT,      /**< an initial transition was taken in a state */
    QS_QEP_INIT_TRAN,        /**< the top-most initial transition was taken */
    QS_QEP_INTERN_TRAN,               /**< an internal transition was taken */
    QS_QEP_TRAN,                        /**< a regular transition was taken */
    QS_QEP_IGNORED,          /**< an event was ignored (silently discarded) */
    QS_QEP_DISPATCH,       /**< an event was dispatched (begin of RTC step) */
    QS_QEP_UNHANDLED,            /**< an event was unhandled due to a guard */

    /* [10] QF records */
    QS_QF_ACTIVE_ADD,             /**< an AO has been added to QF (started) */
    QS_QF_ACTIVE_REMOVE,      /**< an AO has been removed from QF (stopped) */
    QS_QF_ACTIVE_SUBSCRIBE,               /**< an AO subscribed to an event */
    QS_QF_ACTIVE_UNSUBSCRIBE,           /**< an AO unsubscribed to an event */
    QS_QF_ACTIVE_POST_FIFO,  /**< an event was posted (FIFO) directly to AO */
    QS_QF_ACTIVE_POST_LIFO,  /**< an event was posted (LIFO) directly to AO */
    QS_QF_ACTIVE_GET, /**< AO got an event and its queue is still not empty */
    QS_QF_ACTIVE_GET_LAST,      /**< AO got an event and its queue is empty */
    QS_QF_EQUEUE_INIT,                  /**< an event queue was initialized */
    QS_QF_EQUEUE_POST_FIFO,  /**< an event was posted (FIFO) to a raw queue */
    QS_QF_EQUEUE_POST_LIFO,  /**< an event was posted (LIFO) to a raw queue */
    QS_QF_EQUEUE_GET,           /**< get an event and queue still not empty */
    QS_QF_EQUEUE_GET_LAST,           /**< get the last event from the queue */
    QS_QF_MPOOL_INIT,                    /**< a memory pool was initialized */
    QS_QF_MPOOL_GET,     /**< a memory block was removed from a memory pool */
    QS_QF_MPOOL_PUT,      /**< a memory block was returned to a memory pool */
    QS_QF_PUBLISH,                              /**< an event was published */
    QS_QF_RESERVED8,
    QS_QF_NEW,                                      /**< new event creation */
    QS_QF_GC_ATTEMPT,                       /**< garbage collection attempt */
    QS_QF_GC,                                       /**< garbage collection */
    QS_QF_TICK,                                  /**< QF_tickX() was called */
    QS_QF_TIMEEVT_ARM,                          /**< a time event was armed */
    QS_QF_TIMEEVT_AUTO_DISARM,   /**< a time event expired and was disarmed */
    QS_QF_TIMEEVT_DISARM_ATTEMPT,/**< attempt to disarm a disarmed QTimeEvt */
    QS_QF_TIMEEVT_DISARM,        /**< true disarming of an armed time event */
    QS_QF_TIMEEVT_REARM,                      /**< rearming of a time event */
    QS_QF_TIMEEVT_POST,   /**< a time event posted itself directly to an AO */
    QS_QF_TIMEEVT_CTR,              /**< a time event counter was requested */
    QS_QF_CRIT_ENTRY,                     /**< critical section was entered */
    QS_QF_CRIT_EXIT,                       /**< critical section was exited */
    QS_QF_ISR_ENTRY,                                /**< an ISR was entered */
    QS_QF_ISR_EXIT,                                  /**< an ISR was exited */
    QS_QF_INT_DISABLE,                        /**< interrupts were disabled */
    QS_QF_INT_ENABLE,                          /**< interrupts were enabled */
    QS_QF_ACTIVE_POST_ATTEMPT,     /**< attempt to post an evt to AO failed */
    QS_QF_EQUEUE_POST_ATTEMPT,/**< attempt to post an evt to QEQueue failed */
    QS_QF_MPOOL_GET_ATTEMPT,      /**< attempt to get a memory block failed */
    QS_QF_RESERVED1,
    QS_QF_RESERVED0,

    /* [50] QK records */
    QS_QK_MUTEX_LOCK,                          /**< the QK mutex was locked */
    QS_QK_MUTEX_UNLOCK,                      /**< the QK mutex was unlocked */
    QS_QK_SCHEDULE,             /**< the QK scheduled a new task to execute */
    QS_QK_RESERVED6,
    QS_QK_RESERVED5,
    QS_QK_RESERVED4,
    QS_QK_RESERVED3,
    QS_QK_RESERVED2,
    QS_QK_RESERVED1,
    QS_QK_RESERVED0,

    /* [60] Miscellaneous QS records */
    QS_SIG_DICT,                               /**< signal dictionary entry */
    QS_OBJ_DICT,                               /**< object dictionary entry */
    QS_FUN_DICT,                             /**< function dictionary entry */
    QS_USR_DICT,                       /**< user QS record dictionary entry */
    QS_EMPTY,           /**< empty QS record for cleanly starting a session */
    QS_RESERVED3,
    QS_RESERVED2,
    QS_TEST_RUN,                             /**< a given test is being run */
    QS_TEST_FAIL,                              /**< a test assertion failed */
    QS_ASSERT_FAIL,                       /**< assertion failed in the code */

    /* [70] Application-specific QS records */
    QS_USER      /**< \brief the first record available for user QS records */
};

/** \brief Specification of all QS records for  QS_FILTER_ON() and
* QS_FILTER_OFF()
*/
#define QS_ALL_RECORDS          ((uint8_t)0xFF)

#ifndef QS_TIME_SIZE

    /** \brief The size (in bytes) of the QS time stamp. Valid values: 1, 2,
    * or 4; default 4.
    *
    * This macro can be defined in the QS port file (qs_port.h) to
    * configure the ::QSTimeCtr type. Here the macro is not defined so the
    * default of 4 byte is chosen.
    */
    #define QS_TIME_SIZE 4
#endif

#if (QS_TIME_SIZE == 1)
    typedef uint8_t QSTimeCtr;
    #define QS_TIME_()          (QS_u8_(QS_onGetTime()))
#elif (QS_TIME_SIZE == 2)
    typedef uint16_t QSTimeCtr;
    #define QS_TIME_()          (QS_u16_(QS_onGetTime()))
#elif (QS_TIME_SIZE == 4)
    /** \brief The type of the QS time stamp
    *
    * This type determines the dynamic range of QS time stamps
    */
    typedef uint32_t QSTimeCtr;
    /** \brief Internal macro to output time stamp to a QS record
    */
    #define QS_TIME_()          (QS_u32_(QS_onGetTime()))
#else
    #error "QS_TIME_SIZE defined incorrectly, expected 1, 2, or 4"
#endif

#ifndef Q_ROM                   /* provide the default if Q_ROM NOT defined */
    #define Q_ROM
#endif
#ifndef Q_ROM_BYTE         /* provide the default if Q_ROM_BYTE NOT defined */
    #define Q_ROM_BYTE(rom_var_)   (rom_var_)
#endif

/*****************************************************************************
* QS services.
*/
/* public methods */
/** \brief Initialize the QS data buffer.
*
* This function should be called from QS_onStartup() to provide QS with
* the data buffer. The first argument \a sto[] is the address of the memory
* block, and the second argument \a stoSize is the size of this block
* in bytes. Currently the size of the QS buffer cannot exceed 64KB.
*
* QS can work with quite small data buffers, but you will start losing data
* if the buffer is too small for the bursts of logging activity.
* The right size of the buffer depends on the data production rate and
* the data output rate. QS offers flexible filtering to reduce the data
* production rate.
*
* \note If the data output rate cannot keep up with the production rate,
* QS will start overwriting the older data with newer data. This is
* consistent with the "last-is-best" QS policy. The record sequence counters
* and check sums on each record allow to easily detect data loss.
*/
void QS_initBuf(uint8_t sto[], uint_t stoSize);

/**
 \brief Turn the global Filter on for a given record type \a rec.
*
* This function sets up the QS filter to enable the record type \a rec.
* The argument #QS_ALL_RECORDS specifies to filter-in all records.
* This function should be called indirectly through the macro QS_FILTER_ON.
*
* \note Filtering based on the record-type is only the first layer of
* filtering. The second layer is based on the object-type. Both filter
* layers must be enabled for the QS record to be inserted into the QS buffer.
* \sa QS_filterOff(), QS_FILTER_SM_OBJ, QS_FILTER_AO_OBJ, QS_FILTER_MP_OBJ,
* QS_FILTER_EQ_OBJ, and QS_FILTER_TE_OBJ.
*/
void QS_filterOn(uint8_t rec);

/** \brief Turn the global Filter off for a given record type \a rec.
*
* This function sets up the QS filter to disable the record type \a rec.
* The argument #QS_ALL_RECORDS specifies to suppress all records.
* This function should be called indirectly through the macro QS_FILTER_OFF.
*
* \note Filtering records based on the record-type is only the first layer of
* filtering. The second layer is based on the object-type. Both filter
* layers must be enabled for the QS record to be inserted into the QS buffer.
* \sa
*/
void QS_filterOff(uint8_t rec);

/** \brief Mark the begin of a QS record \a rec
*
* This function must be called at the beginning of each QS record.
* This function should be called indirectly through the macro #QS_BEGIN,
* or #QS_BEGIN_NOCRIT, depending if it's called in a normal code or from
* a critical section.
*/
void QS_beginRec(uint8_t rec);

/** \brief Mark the end of a QS record \a rec
*
* This function must be called at the end of each QS record.
* This function should be called indirectly through the macro #QS_END,
* or #QS_END_NOCRIT, depending if it's called in a normal code or from
* a critical section.
*/
void QS_endRec(void);

/* unformatted data elements output ........................................*/
/** \brief output uint8_t data element without format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_u8_(uint8_t d);

/** \brief output two uint8_t data elements without format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_u8u8_(uint8_t d1, uint8_t d2);

/** \brief Output uint16_t data element without format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_u16_(uint16_t d);

/** \brief Output uint32_t data element without format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_u32_(uint32_t d);

/** \brief Output zero-terminated ASCII string element without format
* information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_str_(char_t const *s);

/** \brief Output zero-terminated ASCII string element allocated in ROM
* without format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_str_ROM_(char_t const Q_ROM *s);

/* formatted data elements output ..........................................*/
/** \brief Output uint8_t data element with format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_u8(uint8_t format, uint8_t d);

/** \brief output uint16_t data element with format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_u16(uint8_t format, uint16_t d);

/** \brief Output uint32_t data element with format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_u32(uint8_t format, uint32_t d);

/** \brief Output 32-bit floating point data element with format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_f32(uint8_t format, float32_t f);

/** \brief Output 64-bit floating point data element with format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_f64(uint8_t format, float64_t d);

/** \brief Output zero-terminated ASCII string element with format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_str(char_t const *s);

/** \brief Output zero-terminated ASCII string element allocated in ROM
* with format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_str_ROM(char_t const Q_ROM *s);

/** \brief Output memory block of up to 255-bytes with format information
* \note This function is only to be used through macros, never in the
* client code directly.
*/
void QS_mem(uint8_t const *blk, uint8_t size);

#if (QS_OBJ_PTR_SIZE == 8) || (QS_FUN_PTR_SIZE == 8)
    /** \brief Output uint64_t data element without format information
    * \note This function is only to be used through macros, never in the
    * client code directly.
    */
    void QS_u64_(uint64_t d);

    /** \brief Output uint64_t data element with format information
    * \note This function is only to be used through macros, never in the
    * client code directly.
    */
    void QS_u64(uint8_t format, uint64_t d);
#endif

/** \brief Output signal dictionary record
* \note This function is only to be used through macro #QS_SIG_DICTIONARY
*/
void QS_sig_dict(enum_t const sig, void const * const obj,
                 char_t const Q_ROM * const name);

/** \brief Output object dictionary record
* \note This function is only to be used through macro #QS_OBJ_DICTIONARY
*/
void QS_obj_dict(void const * const obj,
                 char_t const Q_ROM * const name);

/** \brief Output function dictionary record
* \note This function is only to be used through macro #QS_FUN_DICTIONARY
*/
void QS_fun_dict(void (* const fun)(void),
                 char_t const Q_ROM *const name);

/** \brief Output user dictionary record
* \note This function is only to be used through macro #QS_USR_DICTIONARY
*/
void QS_usr_dict(enum_t const rec,
                 char_t const Q_ROM * const name);

/* QS buffer access ........................................................*/
/** \brief Byte-oriented interface to the QS data buffer.
*
* This function delivers one byte at a time from the QS data buffer.
* The function returns the byte in the least-significant 8-bits of the
* 16-bit return value if the byte is available. If no more data is
* available at the time, the function returns QS_EOD (End-Of-Data).
*
* \note QS_getByte() is NOT protected with a critical section.
*/
uint16_t QS_getByte(void);

/** \brief Constant representing End-Of-Data condition returned from the
* QS_getByte() function.
*/
#define QS_EOD ((uint16_t)0xFFFF)

/** \brief Block-oriented interface to the QS data buffer.
*
* This function delivers a contiguous block of data from the QS data buffer.
* The function returns the pointer to the beginning of the block, and writes
* the number of bytes in the block to the location pointed to by \a pNbytes.
* The argument \a pNbytes is also used as input to provide the maximum size of
* the data block that the caller can accept.
*
* If no bytes are available in the QS buffer when the function is called,
* the function returns a NULL pointer and sets the value pointed to by
* \a pNbytes to zero.
*
* \note Only the NULL return from QS_getBlock() indicates that the QS buffer
* is empty at the time of the call. The non-NULL return often means that
* the block is at the end of the buffer and you need to call QS_getBlock()
* again to obtain the rest of the data that "wrapped around" to the beginning
* of the QS data buffer.
*
* \note QS_getBlock() is NOT protected with a critical section.
*/
uint8_t const *QS_getBlock(uint16_t *pNbytes);


/* platform-specific callback functions, need to be implemented by clients  */

/** \brief Callback to startup the QS facility
*
* This is a platform-dependent "callback" function invoked through the macro
* #QS_INIT. You need to implement this function in your application.
* At a minimum, the function must configure the QS buffer by calling
* QS_initBuf(). Typically, you will also want to open/configure the QS output
* channel, such as a serial port, or a data file. The void* argument \a arg
* can be used to pass parameter(s) needed to configure the output channel.
*
* The function returns TRUE (1) if the QS initialization was successful,
* or FALSE (0) if it failed.
*
* The following example illustrates an implementation of QS_onStartup():
* \include qs_startup.c
*/
uint8_t QS_onStartup(void const *arg);

/** \brief Callback to cleanup the QS facility
*
* This is a platform-dependent "callback" function invoked through the macro
* #QS_EXIT. You need to implement this function in your application.
* The main purpose of this function is to close the QS output channel, if
* necessary.
*/
void QS_onCleanup(void);

/** \brief Callback to flush the QS trace data to the host
*
* This is a platform-dependent "callback" function to flush the QS trace
* buffer to the host. The function typically busy-waits until all the data
* in the buffer is sent to the host. This is acceptable only in the initial
* transient.
*/
void QS_onFlush(void);

/** \brief Callback to obtain a timestamp for a QS record.
*
* This is a platform-dependent "callback" function invoked from the macro
* #QS_TIME_ to add the time stamp to a QS record.
*
* \note Some of the predefined QS records from QP do not output the time
* stamp. However, ALL user records do output the time stamp.
* \note QS_onGetTime() is called in a critical section and should not
* exit the critical section.
*
*
 The following example shows using a system call to implement QS
* time stamping:
* \include qs_onGetTime.c
*/
QSTimeCtr QS_onGetTime(void);


/* Macros for adding QS instrumentation to the client code .................*/

/** \brief Initialize the QS facility.
*
* This macro provides an indirection layer to invoke the QS initialization
* routine if #Q_SPY is defined, or do nothing if #Q_SPY is not defined.
* \sa QS_onStartup(), example of setting up a QS filter in QS_FILTER_ON
*/
#define QS_INIT(arg_)           (QS_onStartup(arg_) != (uint8_t)0)

/** \brief Cleanup the QS facility.
*
* This macro provides an indirection layer to invoke the QS cleanup
* routine if #Q_SPY is defined, or do nothing if #Q_SPY is not defined.
* \sa QS_exit()
*/
#define QS_EXIT()               (QS_onCleanup())

/** \brief Global Filter ON for a given record type \a rec.
*
* This macro provides an indirection layer to call QS_filterOn() if #Q_SPY
* is defined, or do nothing if #Q_SPY is not defined.
*
* The following example shows how to use QS filters:
* \include qs_filter.c
*/
#define QS_FILTER_ON(rec_)      (QS_filterOn((uint8_t)(rec_)))

/** \brief Global filter OFF for a given record type \a rec.
*
* This macro provides an indirection layer to call QS_filterOff() if #Q_SPY
* is defined, or do nothing if #Q_SPY is not defined.
*
* \sa Example of using QS filters in #QS_FILTER_ON documentation
*/
#define QS_FILTER_OFF(rec_)     (QS_filterOff((uint8_t)(rec_)))

/** \brief Local Filter for a given state machine object \a obj_.
*
* This macro sets up the state machine object local filter if #Q_SPY is
* defined, or does nothing if #Q_SPY is not defined. The argument \a obj_
* is the pointer to the state machine object that you want to monitor.
*
* The state machine object filter allows you to filter QS records pertaining
* only to a given state machine object. With this filter disabled, QS will
* output records from all state machines in your application. The object
* filter is disabled by setting the state machine pointer to NULL.
*
* The state machine filter affects the following QS records:
* ::QS_QEP_STATE_ENTRY, ::QS_QEP_STATE_EXIT, ::QS_QEP_STATE_INIT,
* ::QS_QEP_INIT_TRAN, ::QS_QEP_INTERN_TRAN, ::QS_QEP_TRAN,
* and ::QS_QEP_IGNORED.
*
* \note Because active objects are state machines at the same time,
* the state machine filter (QS_FILTER_SM_OBJ) pertains to active
* objects as well. However, the state machine filter is more general,
* because it can be used only for state machines that are not active objects,
* such as "Orthogonal Components".
*
* \sa Example of using QS filters in #QS_FILTER_ON documentation
*/
#define QS_FILTER_SM_OBJ(obj_)  (QS_priv_.smObjFilter = (obj_))

/** \brief Local Filter for a given active object \a obj_.
*
* This macro sets up the active object local filter if #Q_SPY is defined,
* or does nothing if #Q_SPY is not defined. The argument \a obj_ is the
* pointer to the active object that you want to monitor.
*
* The active object filter allows you to filter QS records pertaining
* only to a given active object. With this filter disabled, QS will
* output records from all active objects in your application. The object
* filter is disabled by setting the active object pointer \a obj_ to NULL.
*
* The active object filter affects the following QS records:
* ::QS_QF_ACTIVE_ADD, ::QS_QF_ACTIVE_REMOVE, ::QS_QF_ACTIVE_SUBSCRIBE,
* ::QS_QF_ACTIVE_UNSUBSCRIBE, ::QS_QF_ACTIVE_POST, ::QS_QF_ACTIVE_POST_LIFO,
* ::QS_QF_ACTIVE_GET, and ::QS_QF_ACTIVE_GET_LAST.
*
* \sa Example of using QS filters in #QS_FILTER_ON documentation
*/
#define QS_FILTER_AO_OBJ(obj_)  (QS_priv_.aoObjFilter = (obj_))

/** \brief Local Filter for a given memory pool object \a obj_.
*
* This macro sets up the memory pool local object filter if #Q_SPY is
* defined, or does nothing if #Q_SPY is not defined. The argument \a obj_
* is the pointer to the memory buffer used during the initialization of
* the event pool with QF_poolInit().
*
* The memory pool filter allows you to filter QS records pertaining
* only to a given memory pool. With this filter disabled, QS will
* output records from all memory pools in your application. The object
* filter is disabled by setting the memory pool pointer \a obj_ to NULL.
*
* The memory pool filter affects the following QS records:
* ::QS_QF_MPOOL_INIT, ::QS_QF_MPOOL_GET, and ::QS_QF_MPOOL_PUT.
*
* \sa Example of using QS filters in #QS_FILTER_ON documentation
*/
#define QS_FILTER_MP_OBJ(obj_)  (QS_priv_.mpObjFilter = (obj_))

/** \brief Local Filter for a given event queue object \a obj_.
*
* This macro sets up the event queue object local filter if #Q_SPY is
* defined, or does nothing if #Q_SPY is not defined. The argument \a obj_
* is the pointer to the "raw" thread-safe queue object you want to monitor.
*
* The event queue filter allows you to filter QS records pertaining
* only to a given event queue. With this filter disabled, QS will
* output records from all event queues in your application. The object
* filter is disabled by setting the event queue pointer \a obj_ to NULL.
*
* The event queue filter affects the following QS records:
* ::QS_QF_EQUEUE_INIT, ::QS_QF_EQUEUE_POST, ::QS_QF_EQUEUE_POST_LIFO,
* ::QS_QF_EQUEUE_GET, and ::QS_QF_EQUEUE_GET_LAST.
*
* \sa Example of using QS filters in #QS_FILTER_ON documentation
*/
#define QS_FILTER_EQ_OBJ(obj_)  (QS_priv_.eqObjFilter = (obj_))

/** \brief Local Filter for a given time event object \a obj_.
*
* This macro sets up the time event object local filter if #Q_SPY is defined,
* or does nothing if #Q_SPY is not defined. The argument \a obj_ is the
* pointer to the time event object you want to monitor.
*
* The time event filter allows you to filter QS records pertaining
* only to a given time event. With this filter disabled, QS will
* output records from all time events in your application. The object
* filter is disabled by setting the time event pointer \a obj_ to NULL.
*
* The time event filter affects the following QS records:
* ::QS_QF_TIMEEVT_ARM, ::QS_QF_TIMEEVT_AUTO_DISARM,
* ::QS_QF_TIMEEVT_DISARM_ATTEMPT, ::QS_QF_TIMEEVT_DISARM,
* ::QS_QF_TIMEEVT_REARM, ::QS_QF_TIMEEVT_POST, and ::QS_QF_TIMEEVT_PUBLISH.
*
* \sa Example of using QS filters in #QS_FILTER_ON documentation
*/
#define QS_FILTER_TE_OBJ(obj_)  (QS_priv_.teObjFilter = (obj_))

/** \brief Local Filter for a generic application object \a obj_.
*
* This macro sets up the application object local filter if #Q_SPY is
* defined, or does nothing if #Q_SPY is not defined. The argument \a obj_
* is the pointer to the application object you want to monitor.
*
* The application object filter allows you to filter QS records pertaining
* only to a given application object. With this filter disabled, QS will
* output records from all application-records enabled by the global filter.
* The local filter is disabled by setting the time event pointer \a obj_
* to NULL.
*
* \sa Example of using QS filters in #QS_FILTER_ON documentation
*/
#define QS_FILTER_AP_OBJ(obj_)  (QS_priv_.apObjFilter = (obj_))

/* Macros to generate user QS records ......................................*/

/** \brief Begin a QS user record without entering critical section.
*/
#define QS_BEGIN_NOCRIT(rec_, obj_) \
    if (((QS_priv_.glbFilter[(rec_) >> 3] \
          & (uint8_t)(1U << ((uint8_t)(rec_) & (uint8_t)7))) != (uint8_t)0) \
        && ((QS_priv_.apObjFilter == (void *)0) \
           || (QS_priv_.apObjFilter == (obj_)))) \
    { \
        QS_beginRec((uint8_t)(rec_)); \
        QS_TIME_(); {

/** \brief End a QS user record without exiting critical section.
*/
#define QS_END_NOCRIT() } \
    QS_END_NOCRIT_()

/* QS-specific critical section ............................................*/
#ifdef QS_CRIT_ENTRY               /* separate QS critical section defined? */

#ifndef QS_CRIT_STAT_TYPE
    #define QS_CRIT_STAT_
    #define QS_CRIT_ENTRY_()    QS_CRIT_ENTRY(dummy)
    #define QS_CRIT_EXIT_()     QS_CRIT_EXIT(dummy)
#else
    #define QS_CRIT_STAT_       QS_CRIT_STAT_TYPE critStat_;
    #define QS_CRIT_ENTRY_()    QS_CRIT_ENTRY(critStat_)
    #define QS_CRIT_EXIT_()     QS_CRIT_EXIT(critStat_)
#endif

#else    /* separate QS critical section not defined--use the QF definition */

#ifndef QF_CRIT_STAT_TYPE
    /** \brief This is an internal macro for defining the critical section
    * status type.
    *
    * The purpose of this macro is to enable writing the same code for the
    * case when critical section status type is defined and when it is not.
    * If the macro #QF_CRIT_STAT_TYPE is defined, this internal macro
    * provides the definition of the critical section status variable.
    * Otherwise this macro is empty.
    * \sa #QF_CRIT_STAT_TYPE
    */
    #define QS_CRIT_STAT_

    /** \brief This is an internal macro for entering a critical section.
    *
    * The purpose of this macro is to enable writing the same code for the
    * case when critical section status type is defined and when it is not.
    * If the macro #QF_CRIT_STAT_TYPE is defined, this internal macro
    * invokes #QF_CRIT_ENTRY passing the key variable as the parameter.
    * Otherwise #QF_CRIT_ENTRY is invoked with a dummy parameter.
    * \sa #QF_CRIT_ENTRY
    */
    #define QS_CRIT_ENTRY_()    QF_CRIT_ENTRY(dummy)

    /** \brief This is an internal macro for exiting a critical section.
    *
    * The purpose of this macro is to enable writing the same code for the
    * case when critical section status type is defined and when it is not.
    * If the macro #QF_CRIT_STAT_TYPE is defined, this internal macro
    * invokes #QF_CRIT_EXIT passing the key variable as the parameter.
    * Otherwise #QF_CRIT_EXIT is invoked with a dummy parameter.
    * \sa #QF_CRIT_EXIT
    */
    #define QS_CRIT_EXIT_()     QF_CRIT_EXIT(dummy)

#else
    #define QS_CRIT_STAT_       QF_CRIT_STAT_TYPE critStat_;
    #define QS_CRIT_ENTRY_()    QF_CRIT_ENTRY(critStat_)

    #define QS_CRIT_EXIT_()     QF_CRIT_EXIT(critStat_)
#endif

#endif                                                     /* QS_CRIT_ENTRY */

/** \brief Begin a user QS record with entering critical section.
*
* The following example shows how to build a user QS record using the
* macros #QS_BEGIN, #QS_END, and the formatted output macros: #QS_U8 and
* #QS_STR.
* \include qs_user.c
* \note Must always be used in pair with #QS_END
*/
#define QS_BEGIN(rec_, obj_) \
    if (((QS_priv_.glbFilter[(uint8_t)(rec_) >> 3] \
          & (uint8_t)(1U << ((uint8_t)(rec_) & (uint8_t)7))) != (uint8_t)0) \
        && ((QS_priv_.apObjFilter == (void *)0) \
            || (QS_priv_.apObjFilter == (obj_)))) \
    { \
        QS_CRIT_STAT_ \
        QS_CRIT_ENTRY_(); \
        QS_beginRec((uint8_t)(rec_)); \
        QS_TIME_(); {

/** \brief End a QS record with exiting critical section.
* \sa example for #QS_BEGIN
* \note Must always be used in pair with #QS_BEGIN
*/
#define QS_END() } \
    QS_END_()

/****************************************************************************/

/** \brief Internal QS macro to begin a QS record with entering critical
* section.
*
* \note This macro is intended to use only inside QP components and NOT
* at the application level. \sa #QS_BEGIN
*/
#define QS_BEGIN_(rec_, objFilter_, obj_) \
    if (((QS_priv_.glbFilter[(uint8_t)(rec_) >> 3] \
          & (uint8_t)(1U << ((uint8_t)(rec_) & (uint8_t)7))) != (uint8_t)0) \
        && (((objFilter_) == (void *)0) \
            || ((objFilter_) == (obj_)))) \
    { \
        QS_CRIT_ENTRY_(); \
        QS_beginRec((uint8_t)(rec_));

/** \brief  Internal QS macro to end a QS record with exiting critical
* section.
*
* \note This macro is intended to use only inside QP components and NOT
* at the application level. \sa #QS_END
*/
#define QS_END_() \
        QS_endRec(); \
        QS_CRIT_EXIT_(); \
    }

/** \brief Internal QS macro to begin a QS record without entering critical
* section.
*
* \note This macro is intended to use only inside QP components and NOT
* at the application level. \sa #QS_BEGIN_NOCRIT
*/
#define QS_BEGIN_NOCRIT_(rec_, objFilter_, obj_) \
    if (((QS_priv_.glbFilter[(uint8_t)(rec_) >> 3] \
          & (uint8_t)(1U << ((uint8_t)(rec_) & (uint8_t)7))) != (uint8_t)0) \
        && (((objFilter_) == (void *)0) \
            || ((objFilter_) == (obj_)))) \
    { \
        QS_beginRec((uint8_t)(rec_));

/** \brief Internal QS macro to end a QS record without exiting critical
* section.
* \note This macro is intended to use only inside QP components and NOT
* at the application level. \sa #QS_END_NOCRIT
*/
#define QS_END_NOCRIT_() \
        QS_endRec(); \
    }

/** \brief Internal QS macro to output an unformatted uint8_t data element */
#define QS_U8_(data_)           (QS_u8_(data_))

/** \brief Internal QS macro to output 2 unformatted uint8_t data elements */
#define QS_2U8_(data1_, data2_) (QS_u8u8_((data1_), (data2_)))

/** \brief Internal QS macro to output an unformatted uint16_t data element */
#define QS_U16_(data_)          (QS_u16_(data_))

/** \brief Internal QS macro to output an unformatted uint32_t data element */
#define QS_U32_(data_)          (QS_u32_(data_))


#if (Q_SIGNAL_SIZE == 1)
    /** \brief Internal QS macro to output an unformatted event signal
    * data element
    * \note the size of the pointer depends on the macro #Q_SIGNAL_SIZE.
    */
    #define QS_SIG_(sig_)       (QS_u8_(sig_))
#elif (Q_SIGNAL_SIZE == 2)
    #define QS_SIG_(sig_)       (QS_u16_(sig_))
#elif (Q_SIGNAL_SIZE == 4)
    #define QS_SIG_(sig_)       (QS_u32_(sig_))
#endif


#if (QS_OBJ_PTR_SIZE == 1)
    #define QS_OBJ_(obj_)       (QS_u8_((uint8_t)(obj_)))
#elif (QS_OBJ_PTR_SIZE == 2)
    #define QS_OBJ_(obj_)       (QS_u16_((uint16_t)(obj_)))
#elif (QS_OBJ_PTR_SIZE == 4)
    #define QS_OBJ_(obj_)       (QS_u32_((uint32_t)(obj_)))
#elif (QS_OBJ_PTR_SIZE == 8)
    #define QS_OBJ_(obj_)       (QS_u64_((uint64_t)(obj_)))
#else

    /** \brief Internal QS macro to output an unformatted object pointer
    * data element
    * \note the size of the pointer depends on the macro #QS_OBJ_PTR_SIZE.
    * If the size is not defined the size of pointer is assumed 4-bytes.
    */
    #define QS_OBJ_(obj_)       (QS_u32_((uint32_t)(obj_))
#endif


#if (QS_FUN_PTR_SIZE == 1)
    #define QS_FUN_(fun_)       (QS_u8_((uint8_t)(fun_)))
#elif (QS_FUN_PTR_SIZE == 2)
    #define QS_FUN_(fun_)       (QS_u16_((uint16_t)(fun_)))
#elif (QS_FUN_PTR_SIZE == 4)
    #define QS_FUN_(fun_)       (QS_u32_((uint32_t)(fun_)))
#elif (QS_FUN_PTR_SIZE == 8)
    #define QS_FUN_(fun_)       (QS_u64_((uint64_t)(fun_)))
#else

    /** \brief Internal QS macro to output an unformatted function pointer
    * data element
    * \note the size of the pointer depends on the macro #QS_FUN_PTR_SIZE.
    * If the size is not defined the size of pointer is assumed 4-bytes.
    */
    #define QS_FUN_(fun_)       (QS_u32_((uint32_t)(fun_)))
#endif


/** \brief Internal QS macro to output a zero-terminated ASCII string
* data element
*/
#define QS_STR_(msg_)           (QS_str_(msg_))

/** \brief Internal QS macro to output a zero-terminated ASCII string
* allocated in ROM data element
*/
#define QS_STR_ROM_(msg_)       (QS_str_ROM_(msg_))

/* Macros for use in the client code .......................................*/

/** \brief Enumerates data formats recognized by QS
*
* QS uses this enumeration is used only internally for the formatted user
* data elements.
*/
enum QSType {
    QS_I8_T,                               /**< signed 8-bit integer format */
    QS_U8_T,                             /**< unsigned 8-bit integer format */
    QS_I16_T,                             /**< signed 16-bit integer format */
    QS_U16_T,                           /**< unsigned 16-bit integer format */
    QS_I32_T,                             /**< signed 32-bit integer format */
    QS_U32_T,                           /**< unsigned 32-bit integer format */
    QS_F32_T,                             /**< 32-bit floating point format */
    QS_F64_T,                             /**< 64-bit floating point format */
    QS_STR_T,                      /**< zero-terminated ASCII string format */
    QS_MEM_T,                      /**< up to 255-bytes memory block format */
    QS_SIG_T,                                      /**< event signal format */
    QS_OBJ_T,                                    /**< object pointer format */
    QS_FUN_T,                                  /**< function pointer format */
    QS_I64_T,                             /**< signed 64-bit integer format */
    QS_U64_T,                           /**< unsigned 64-bit integer format */
    QS_U32_HEX_T                 /**< unsigned 32-bit integer in hex format */
};

/** \brief Output formatted int8_t to the QS record */
#define QS_I8(width_, data_) \
    (QS_u8((uint8_t)(((width_) << 4)) | (uint8_t)QS_I8_T, (data_)))

/** \brief Output formatted uint8_t to the QS record */
#define QS_U8(width_, data_) \
    (QS_u8((uint8_t)(((width_) << 4)) | (uint8_t)QS_U8_T, (data_)))

/** \brief Output formatted int16_t to the QS record */
#define QS_I16(width_, data_) \
    (QS_u16((uint8_t)(((width_) << 4)) | (uint8_t)QS_I16_T, (data_)))

/** \brief Output formatted uint16_t to the QS record */
#define QS_U16(width_, data_) \
    (QS_u16((uint8_t)(((width_) << 4)) | (uint8_t)QS_U16_T, (data_)))

/** \brief Output formatted int32_t to the QS record */
#define QS_I32(width_, data_) \
    (QS_u32((uint8_t)(((width_) << 4)) | (uint8_t)QS_I32_T, (data_)))

/** \brief Output formatted uint32_t to the QS record */
#define QS_U32(width_, data_) \
    (QS_u32((uint8_t)(((width_) << 4)) | (uint8_t)QS_U32_T, (data_)))

/** \brief Output formatted 32-bit floating point number to the QS record */
#define QS_F32(width_, data_) \
    (QS_f32((uint8_t)(((width_) << 4)) | (uint8_t)QS_F32_T, (data_)))

/** \brief Output formatted 64-bit floating point number to the QS record */
#define QS_F64(width_, data_) \
    (QS_f64((uint8_t)(((width_) << 4)) | (uint8_t)QS_F64_T, (data_)))

/** \brief Output formatted int64_t to the QS record */
#define QS_I64(width_, data_) \
    (QS_u64((uint8_t)(((width_) << 4)) | (uint8_t)QS_I64_T, (data_)))

/** \brief Output formatted uint64_t to the QS record */
#define QS_U64(width_, data_) \
    (QS_u64((uint8_t)(((width_) << 4)) | (uint8_t)QS_U64_T, (data_)))

/** \brief Output formatted uint32_t to the QS record */
#define QS_U32_HEX(width_, data_) \
    (QS_u32((uint8_t)(((width_) << 4)) | (uint8_t)QS_U32_HEX_T, (data_)))

/** \brief Output formatted zero-terminated ASCII string to the QS record */
#define QS_STR(str_)            (QS_str(str_))

/** \brief Output formatted zero-terminated ASCII string from ROM
* to the QS record
*/
#define QS_STR_ROM(str_)        (QS_str_ROM(str_))

/** \brief Output formatted memory block of up to 255 bytes to the QS
* record
*/
#define QS_MEM(mem_, size_)     (QS_mem((mem_), (size_)))


#if (QS_OBJ_PTR_SIZE == 1)
    #define QS_OBJ(obj_)        (QS_u8(QS_OBJ_T, (uint8_t)(obj_)))
#elif (QS_OBJ_PTR_SIZE == 2)
    #define QS_OBJ(obj_)        (QS_u16(QS_OBJ_T, (uint16_t)(obj_)))
#elif (QS_OBJ_PTR_SIZE == 4)
    #define QS_OBJ(obj_)        (QS_u32(QS_OBJ_T, (uint32_t)(obj_)))
#elif (QS_OBJ_PTR_SIZE == 8)
    #define QS_OBJ(obj_)        (QS_u64(QS_OBJ_T, (uint64_t)(obj_)))
#else
    /** \brief Output formatted object pointer to the QS record */
    #define QS_OBJ(obj_)        (QS_u32(QS_OBJ_T, (uint32_t)(obj_)))
#endif


#if (QS_FUN_PTR_SIZE == 1)
    #define QS_FUN(fun_)        (QS_u8(QS_FUN_T, (uint8_t)(fun_)))
#elif (QS_FUN_PTR_SIZE == 2)
    #define QS_FUN(fun_)        (QS_u16(QS_FUN_T, (uint16_t)(fun_)))
#elif (QS_FUN_PTR_SIZE == 4)
    #define QS_FUN(fun_)        (QS_u32(QS_FUN_T, (uint32_t)(fun_)))
#elif (QS_FUN_PTR_SIZE == 8)
    #define QS_FUN(fun_)        (QS_u64(QS_FUN_T, (uint64_t)(fun_)))
#else

    /** \brief Output formatted function pointer to the QS record */
    #define QS_FUN(fun_)        (QS_u32(QS_FUN_T, (uint32_t)(fun_)))
#endif


#if (Q_SIGNAL_SIZE == 1)

    /** \brief Output formatted event signal (of type ::QSignal) and
    * the state machine object to the user QS record
    */
    #define QS_SIG(sig_, obj_) \
        QS_u8(QS_SIG_T, (sig_)); \
        QS_OBJ_(obj_)
#elif (Q_SIGNAL_SIZE == 2)
    #define QS_SIG(sig_, obj_) \
        QS_u16(QS_SIG_T, (sig_)); \
        QS_OBJ_(obj_)
#elif (Q_SIGNAL_SIZE == 4)
    #define QS_SIG(sig_, obj_) \
        QS_u32(QS_SIG_T, (sig_)); \
        QS_OBJ_(obj_)
#endif


/** \brief Output signal dictionary record
*
* A signal dictionary record associates the numerical value of the signal
* and the binary address of the state machine that consumes that signal
* with the human-readable name of the signal.
*
* Providing a signal dictionary QS record can vastly improve readability of
* the QS log, because instead of dealing with cryptic machine addresses the
* QSpy host utility can display human-readable names.
*
* A signal dictionary entry is associated with both the signal value \a sig_
* and the state machine \a obj_, because signals are required to be unique
* only within a given state machine and therefore the same numerical values
* can represent different signals in different state machines.
*
* For the "global" signals that have the same meaning in all state machines
* (such as globally published signals), you can specify a signal dictionary
* entry with the \a obj_ parameter set to NULL.
*
* The following example shows the definition of signal dictionary entries
* in the initial transition of the Table active object. Please note that
* signals HUNGRY_SIG and DONE_SIG are associated with the Table state machine
* only ("me" \a obj_ pointer). The EAT_SIG signal, on the other hand,
* is global (0 \a obj_ pointer):
* \include qs_sigDic.c
*
* \note The QSpy log utility must capture the signal dictionary record
* in order to use the human-readable information. You need to connect to
* the target before the dictionary entries have been transmitted.
*
* The following QSpy log example shows the signal dictionary records
* generated from the Table initial transition and subsequent records that
* show human-readable names of the signals:
* \include qs_sigLog.txt
*
* The following QSpy log example shows the same sequence of records, but
* with dictionary records removed. The human-readable signal names are not
* available.
* \include qs_sigLog0.txt
*/
#define QS_SIG_DICTIONARY(sig_, obj_) do { \
    if (((QS_priv_.glbFilter[(uint8_t)QS_SIG_DICT >> 3] \
      & (uint8_t)(1U << ((uint8_t)QS_SIG_DICT & (uint8_t)7))) != (uint8_t)0))\
    { \
        static char_t const Q_ROM sig_name_[] = #sig_; \
        QS_sig_dict((sig_), (obj_), &sig_name_[0]); \
    } \
} while (0)

/** \brief Output object dictionary record
*
* An object dictionary record associates the binary address of an object
* in the target's memory with the human-readable name of the object.
*
* Providing an object dictionary QS record can vastly improve readability of
* the QS log, because instead of dealing with cryptic machine addresses the
* QSpy host utility can display human-readable object names.
*
* The following example shows the definition of object dictionary entry
* for the Table active object:
* \include qs_objDic.c
*/
#define QS_OBJ_DICTIONARY(obj_) do { \
    if (((QS_priv_.glbFilter[(uint8_t)QS_OBJ_DICT >> 3] \
      & (uint8_t)(1U << ((uint8_t)QS_OBJ_DICT & (uint8_t)7))) != (uint8_t)0))\
    { \
        static char_t const Q_ROM obj_name_[] = #obj_; \
        QS_obj_dict((obj_), &obj_name_[0]); \
    } \
} while (0)

/** \brief Output function dictionary record
*
* A function dictionary record associates the binary address of a function
* in the target's memory with the human-readable name of the function.
*
* Providing a function dictionary QS record can vastly improve readability of
* the QS log, because instead of dealing with cryptic machine addresses the
* QSpy host utility can display human-readable function names.
*
* The example from #QS_SIG_DICTIONARY shows the definition of a function
* dictionary.
*/
#define QS_FUN_DICTIONARY(fun_) do { \
    if (((QS_priv_.glbFilter[(uint8_t)QS_FUN_DICT >> 3] \
      & (uint8_t)(1U << ((uint8_t)QS_FUN_DICT & (uint8_t)7))) != (uint8_t)0))\
    { \
        static char_t const Q_ROM fun_name_[] = #fun_; \
        QS_fun_dict((void (*)(void))(fun_), &fun_name_[0]); \
    } \
} while (0)

/** \brief Output user QS rectord dictionary record
*
* A user QS record dictionary record associates the numerical value of a
* user record with the human-readable identifier.
*/
#define QS_USR_DICTIONARY(rec_) do { \
    if (((QS_priv_.glbFilter[(uint8_t)QS_USR_DICT >> 3] \
      & (uint8_t)(1U << ((uint8_t)QS_USR_DICT & (uint8_t)7))) != (uint8_t)0))\
    { \
        static char_t const Q_ROM usr_name_[] = #rec_; \
        QS_usr_dict((rec_), &usr_name_[0]); \
    } \
} while (0)

/** \brief Output the assertion failure trace record
* This trace record is intended to use from the Q_onAssert() callback.
*/
#define QS_ASSERTION(module_, loc_) do { \
    QS_BEGIN_NOCRIT_(QS_ASSERT_FAIL, (void *)0, (void *)0) \
        QS_TIME_(); \
        QS_U16_((uint16_t)(loc_)); \
        QS_STR_ROM_(module_); \
    QS_END_NOCRIT_() \
    QS_onFlush(); \
} while (0)

/** \brief Flush the QS trace data to the host
*
* This macro invokes the QS_flush() platform-dependent callback function
* to flush the QS trace buffer to the host. The function typically
* busy-waits until all the data in the buffer is sent to the host.
* This is acceptable only in the initial transient.
*/
#define QS_FLUSH()   (QS_onFlush())

/** \brief Output the critical section entry */
#define QF_QS_CRIT_ENTRY() \
    QS_BEGIN_NOCRIT_(QS_QF_CRIT_ENTRY, (void *)0, (void *)0) \
        QS_TIME_(); \
        QS_U8_((uint8_t)(++QS_priv_.critNest)); \
    QS_END_NOCRIT_()

/** \brief Output the critical section exit */
#define QF_QS_CRIT_EXIT() \
    QS_BEGIN_NOCRIT_(QS_QF_CRIT_EXIT, (void *)0, (void *)0) \
        QS_TIME_(); \
        QS_U8_((uint8_t)(QS_priv_.critNest--)); \
    QS_END_NOCRIT_()

/** \brief Output the interrupt entry record */
#define QF_QS_ISR_ENTRY(isrnest_, prio_) \
    QS_BEGIN_NOCRIT_(QS_QF_ISR_ENTRY, (void *)0, (void *)0) \
        QS_TIME_(); \
        QS_2U8_(isrnest_, prio_); \
    QS_END_NOCRIT_()

/** \brief Output the interrupt exit record */
#define QF_QS_ISR_EXIT(isrnest_, prio_) \
    QS_BEGIN_NOCRIT_(QS_QF_ISR_EXIT, (void *)0, (void *)0) \
        QS_TIME_(); \
        QS_2U8_(isrnest_, prio_); \
    QS_END_NOCRIT_()

/** \brief Execute an action that is only necessary for QS output */
#define QF_QS_ACTION(act_)      (act_)

/** \brief obtain the current QS version number string
*
* version of QS as a constant 5-character string of the form X.Y.Z,
* where X is a 1-digit major version number, Y is a 1-digit minor
* version number, and Z is a 1-digit release number.
*/
#define QS_getVersion() (QP_VERSION_STR)

/* QS private data .........................................................*/
typedef unsigned int QSCtr;     /**< QS ring buffer counter and offset type */

typedef struct QSPrivTag {
    uint8_t    glbFilter[16];                  /**< global on/off QS filter */
    void const *smObjFilter;        /**< state machine for QEP local filter */
    void const *aoObjFilter;         /**< active object for QF local filter */
    void const *mpObjFilter;           /**<  event pool for QF local filter */
    void const *eqObjFilter;            /**<  raw queue for QF local filter */
    void const *teObjFilter;           /**<  time event for QF local filter */
    void const *apObjFilter;  /**<  generic object Application local filter */

    uint8_t *buf;              /**< pointer to the start of the ring buffer */
    QSCtr    end;                 /**< offset of the end of the ring buffer */
    QSCtr    head;          /**< offset to where next byte will be inserted */
    QSCtr    tail;        /**< offset of where next event will be extracted */
    QSCtr    used;        /**< number of bytes currently in the ring buffer */
    uint8_t  seq;                           /**< the record sequence number */
    uint8_t  chksum;                /**< the checksum of the current record */
    uint8_t  full;                 /**< the ring buffer is temporarily full */

    uint8_t   critNest;                 /**< critical section nesting level */
} QSPriv;

extern QSPriv QS_priv_;

#endif                                                             /* qs_h  */