/**
 * CANopen Synchronisation protocol.
 *
 * @file        CO_SYNC.h
 * @ingroup     CO_SYNC
 * @author      Janez Paternoster
 * @copyright   2004 - 2020 Janez Paternoster
 *
 * This file is part of <https://github.com/CANopenNode/CANopenNode>, a CANopen Stack.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
 * file except in compliance with the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 */

#ifndef CO_SYNC_H
#define CO_SYNC_H

#include "301/CO_driver.h"
#include "301/CO_ODinterface.h"
#include "301/CO_Emergency.h"

/* default configuration, see CO_config.h */
#ifndef CO_CONFIG_SYNC
#define CO_CONFIG_SYNC                                                                                                 \
    (CO_CONFIG_SYNC_ENABLE | CO_CONFIG_SYNC_PRODUCER | CO_CONFIG_GLOBAL_RT_FLAG_CALLBACK_PRE                           \
     | CO_CONFIG_GLOBAL_FLAG_TIMERNEXT | CO_CONFIG_GLOBAL_FLAG_OD_DYNAMIC)
#endif

#if (((CO_CONFIG_SYNC)&CO_CONFIG_SYNC_ENABLE) != 0) || defined CO_DOXYGEN

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup CO_SYNC SYNC
 * CANopen Synchronisation protocol.
 *
 * @ingroup CO_CANopen_301
 * @{
 * For CAN identifier see @ref CO_Default_CAN_ID_t
 *
 * SYNC message is used for synchronization of the nodes on network. One node can be SYNC producer, others can be SYNC
 * consumers. Synchronous TPDOs are transmitted after the CANopen SYNC message. Synchronous received PDOs are
 * accepted(copied to OD) immediatelly after the reception of the next SYNC message.
 *
 * ####Contents of SYNC message
 * By default SYNC message has no data. If _Synchronous counter overflow value_ from Object dictionary (index 0x1019) is
 * different than 0, SYNC message has one data byte: _counter_ incremented by 1 with every SYNC transmission.
 *
 * ####SYNC in CANopenNode
 * According to CANopen, synchronous RPDOs must be processed after reception of the next sync messsage. For that reason,
 * there is a double receive buffer for each synchronous RPDO. At the moment, when SYNC is received or transmitted,
 * internal variable CANrxToggle toggles. That variable is then used by synchronous RPDO to determine, which of the two
 * buffers is used for RPDO reception and which for RPDO processing.
 */

/**
 * SYNC producer and consumer object.
 */
typedef struct {
    CO_EM_t* em;             /**< From CO_SYNC_init() */
    volatile void* CANrxNew; /**< Indicates, if new SYNC message received from CAN bus */
    uint8_t receiveError;    /**< Set to nonzero value, if SYNC with wrong data length is received */
    bool_t CANrxToggle;      /**< Variable toggles, if new SYNC message received from CAN bus */
    uint8_t timeoutError;    /**< Sync timeout monitoring: 0 = not started; 1 = started; 2 = sync timeout error state */
    uint8_t counterOverflowValue; /**< Value from _Synchronous counter overflow value_ variable from Object dictionary
                                     (index 0x1019) */
    uint8_t counter;              /**< Counter of the SYNC message if counterOverflowValue is different than zero */
    bool_t syncIsOutsideWindow;   /**< True, if current time is outside "synchronous window" (OD 1007) */
    uint32_t timer;               /**< Timer for the SYNC message in [microseconds]. Set to zero after received or
                                     transmitted SYNC message */
    uint32_t* OD_1006_period;     /**< Pointer to variable in OD, "Communication cycle period" in microseconds */
    uint32_t* OD_1007_window;     /**< Pointer to variable in OD, "Synchronous window length" in microseconds */

#if (((CO_CONFIG_SYNC)&CO_CONFIG_SYNC_PRODUCER) != 0) || defined CO_DOXYGEN
    bool_t isProducer;        /**< True, if device is SYNC producer. Calculated from _COB ID SYNC Message_ variable
                                 from Object dictionary(index 0x1005).*/
    CO_CANmodule_t* CANdevTx; /**< From CO_SYNC_init() */
    CO_CANtx_t* CANtxBuff;    /**< CAN transmit buffer inside CANdevTx */
#endif

#if ((CO_CONFIG_SYNC)&CO_CONFIG_FLAG_OD_DYNAMIC) || defined CO_DOXYGEN
    CO_CANmodule_t* CANdevRx;         /**< From CO_SYNC_init() */
    uint16_t CANdevRxIdx;             /**< From CO_SYNC_init() */
    OD_extension_t OD_1005_extension; /**< Extension for OD object */
    uint16_t CAN_ID;                  /**< CAN ID of the SYNC message. Calculated from _COB ID SYNC Message_ variable
                                         from Object dictionary (index 0x1005). */
#if (((CO_CONFIG_SYNC)&CO_CONFIG_SYNC_PRODUCER) != 0) || defined CO_DOXYGEN
    uint16_t CANdevTxIdx;             /**< From CO_SYNC_init() */
    OD_extension_t OD_1019_extension; /**< Extension for OD object */
#endif
#endif

#if (((CO_CONFIG_SYNC)&CO_CONFIG_FLAG_CALLBACK_PRE) != 0) || defined CO_DOXYGEN
    void (*pFunctSignalPre)(void* object); /**< From CO_SYNC_initCallbackPre() or NULL */
    void* functSignalObjectPre;            /**< From CO_SYNC_initCallbackPre() or NULL */
#endif
} CO_SYNC_t;

/**
 * Return value for @ref CO_SYNC_process
 */
typedef enum {
    CO_SYNC_NONE = 0,         /**< No SYNC event in last cycle */
    CO_SYNC_RX_TX = 1,        /**< SYNC message was received or transmitted in last cycle */
    CO_SYNC_PASSED_WINDOW = 2 /**< Time has just passed SYNC window (OD_1007) in last cycle */
} CO_SYNC_status_t;

/**
 * Initialize SYNC object.
 *
 * Function must be called in the communication reset section.
 *
 * @param SYNC This object will be initialized.
 * @param em Emergency object.
 * @param OD_1005_cobIdSync OD entry for 0x1005 - "COB-ID SYNC message", entry is required.
 * @param OD_1006_commCyclePeriod OD entry for 0x1006 - "Communication cycle period", entry is required if device is
 * sync producer.
 * @param OD_1007_syncWindowLen OD entry for 0x1007 - "Synchronous window length", entry is optional, may be NULL.
 * @param OD_1019_syncCounterOvf OD entry for 0x1019 - "Synchronous counter overflow value", entry is optional, may be
 * NULL.
 * @param CANdevRx CAN device for SYNC reception.
 * @param CANdevRxIdx Index of receive buffer in the above CAN device.
 * @param CANdevTx CAN device for SYNC transmission.
 * @param CANdevTxIdx Index of transmit buffer in the above CAN device.
 * @param [out] errInfo Additional information in case of error, may be NULL.
 *
 * @return #CO_ReturnError_t CO_ERROR_NO on success.
 */
CO_ReturnError_t CO_SYNC_init(CO_SYNC_t* SYNC, CO_EM_t* em, OD_entry_t* OD_1005_cobIdSync,
                              OD_entry_t* OD_1006_commCyclePeriod, OD_entry_t* OD_1007_syncWindowLen,
                              OD_entry_t* OD_1019_syncCounterOvf, CO_CANmodule_t* CANdevRx, uint16_t CANdevRxIdx,
#if (((CO_CONFIG_SYNC)&CO_CONFIG_SYNC_PRODUCER) != 0) || defined CO_DOXYGEN
                              CO_CANmodule_t* CANdevTx, uint16_t CANdevTxIdx,
#endif
                              uint32_t* errInfo);

#if (((CO_CONFIG_SYNC)&CO_CONFIG_FLAG_CALLBACK_PRE) != 0) || defined CO_DOXYGEN
/**
 * Initialize SYNC callback function.
 *
 * Function initializes optional callback function, which should immediately start processing of CO_SYNC_process()
 * function. Callback is called after SYNC message is received from the CAN bus.
 *
 * @param SYNC This object.
 * @param object Pointer to object, which will be passed to pFunctSignalPre().
 * @param pFunctSignalPre Pointer to the callback function. Not called if NULL.
 */
void CO_SYNC_initCallbackPre(CO_SYNC_t* SYNC, void* object, void (*pFunctSignalPre)(void* object));
#endif

#if (((CO_CONFIG_SYNC)&CO_CONFIG_SYNC_PRODUCER) != 0) || defined CO_DOXYGEN
/**
 * Send SYNC message.
 *
 * This function prepares and sends a SYNC object. The application should only call this if direct control of SYNC
 * transmission is needed, otherwise use CO_SYNC_process().
 *
 * @param SYNC SYNC object.
 *
 * @return Same as CO_CANsend().
 */
static inline CO_ReturnError_t
CO_SYNCsend(CO_SYNC_t* SYNC) {
    if (++SYNC->counter > SYNC->counterOverflowValue) {
        SYNC->counter = 1;
    }
    SYNC->timer = 0;
    SYNC->CANrxToggle = SYNC->CANrxToggle ? false : true;
    SYNC->CANtxBuff->data[0] = SYNC->counter;
    return CO_CANsend(SYNC->CANdevTx, SYNC->CANtxBuff);
}
#endif

/**
 * Process SYNC communication.
 *
 * Function must be called cyclically.
 *
 * @param SYNC This object.
 * @param NMTisPreOrOperational True if this node is NMT_PRE_OPERATIONAL or NMT_OPERATIONAL state.
 * @param timeDifference_us Time difference from previous function call in [microseconds].
 * @param [out] timerNext_us info to OS - see CO_process().
 *
 * @return @ref CO_SYNC_status_t
 */
CO_SYNC_status_t CO_SYNC_process(CO_SYNC_t* SYNC, bool_t NMTisPreOrOperational, uint32_t timeDifference_us,
                                 uint32_t* timerNext_us);

/** @} */ /* CO_SYNC */

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* (CO_CONFIG_SYNC) & CO_CONFIG_SYNC_ENABLE */

#endif /* CO_SYNC_H */