interlock.h

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 *
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/**
 * @file    interlock.h
 * @author  foxBMS Team
 * @date    2020-02-24 (date of creation)
 * @updated 2023-10-12 (date of last update)
 * @version v1.6.0
 * @ingroup DRIVERS
 * @prefix  ILCK
 *
 * @brief   Headers for the driver for the interlock.
 *
 */
 
#ifndef FOXBMS__INTERLOCK_H_
#define FOXBMS__INTERLOCK_H_
 
/*========== Includes =======================================================*/
#include "interlock_cfg.h"
 
#include <stdint.h>
 
/*========== Macros and Definitions =========================================*/
 
/**
 * States of the ILCK state machine
 */
typedef enum {
    /* Init-Sequence */
    ILCK_STATEMACHINE_UNINITIALIZED, /*!< Uninitialized state */
    ILCK_STATEMACHINE_INITIALIZED,   /*!< state machine initialized */
    ILCK_STATEMACHINE_UNDEFINED,     /*!< undefined state */
} ILCK_STATEMACH_e;
 
/**
 * Substates of the ILCK state machine
 */
typedef enum {
    ILCK_ENTRY, /*!< Substate entry state       */
} ILCK_STATEMACH_SUB_e;
 
/**
 * State requests for the ILCK state machine
 */
typedef enum {
    ILCK_STATE_INITIALIZATION_REQUEST,
    ILCK_STATE_NO_REQUEST,
} ILCK_STATE_REQUEST_e;
 
/**
 * Possible return values when state requests are made to the ILCK state machine
 */
typedef enum {
    ILCK_OK,                  /*!< ILCK --> ok                             */
    ILCK_REQUEST_PENDING,     /*!< requested to be executed                */
    ILCK_ALREADY_INITIALIZED, /*!< Initialization of ilck already finished */
    ILCK_ILLEGAL_REQUEST,     /*!< Request can not be executed             */
} ILCK_RETURN_TYPE_e;
 
/**
 * This structure contains all the variables relevant for the ILCK state machine.
 * The user can get the current state of the ILCK state machine with this variable
 */
typedef struct {
    uint16_t timer; /*!< time in ms before the state machine processes the next state, e.g. in counts of 1ms    */
    ILCK_STATE_REQUEST_e statereq;     /*!< current state request made to the state machine */
    ILCK_STATEMACH_e state;            /*!< state of Driver State Machine */
    ILCK_STATEMACH_SUB_e substate;     /*!< current substate of the state machine */
    ILCK_STATEMACH_e laststate;        /*!< previous state of the state machine */
    ILCK_STATEMACH_SUB_e lastsubstate; /*!< previous substate of the state machine */
    uint32_t ErrRequestCounter;        /*!< counts the number of illegal requests to the LTC state machine */
    uint8_t triggerentry;              /*!< counter for re-entrance protection (function running flag) */
    uint8_t counter;                   /*!< general purpose counter */
} ILCK_STATE_s;
 
/*========== Extern Constant and Variable Declarations ======================*/
 
/*========== Extern Function Prototypes =====================================*/
 
/**
 * @brief   sets the current state request of the state variable ilck_state.
 *
 * This function is used to make a state request to the state machine,e.g, start voltage measurement,
 * read result of voltage measurement, re-initialization
 * It calls ILCK_CheckStateRequest() to check if the request is valid.
 * The state request is rejected if is not valid.
 * The result of the check is returned immediately, so that the requester can act in case
 * it made a non-valid state request.
 *
 * @param   statereq                state request to set
 *
 * @return  retVal                  current state request, taken from ILCK_STATE_REQUEST_e
 */
extern ILCK_RETURN_TYPE_e ILCK_SetStateRequest(ILCK_STATE_REQUEST_e statereq);
 
/**
 * @brief   gets the current state.
 *
 * This function is used in the functioning of the ILCK state machine.
 *
 * @return  current state, taken from ILCK_STATEMACH_e
 */
extern ILCK_STATEMACH_e ILCK_GetState(void);
 
/**
 * @brief   trigger function for the ILCK driver state machine.
 *
 * This function contains the sequence of events in the ILCK state machine.
 * It must be called time-triggered, every 1ms.
 */
extern void ILCK_Trigger(void);
 
/*========== Externalized Static Functions Prototypes (Unit Test) ===========*/
#ifdef UNITY_UNIT_TEST
extern void TEST_ILCK_SetStateStruct(ILCK_STATE_s state);
extern ILCK_ELECTRICAL_STATE_TYPE_e TEST_ILCK_GetInterlockFeedback(void);
#endif
 
#endif /* FOXBMS__INTERLOCK_H_ */