interlock.h

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 *
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/**
 * @file    interlock.h
 * @author  foxBMS Team
 * @date    2020-02-24 (date of creation)
 * @updated 2020-02-24 (date of last update)
 * @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"
 
/*========== Macros and Definitions =========================================*/
 
/**
 * States of the ILCK state machine
 */
typedef enum {
    /* Init-Sequence */
    ILCK_STATEMACH_UNINITIALIZED,      /*!< Uninitialized state */
    ILCK_STATEMACH_INITIALIZATION,     /*!< Initialization state */
    ILCK_STATEMACH_INITIALIZED,        /*!< statemachine initialized */
    ILCK_STATEMACH_WAIT_FIRST_REQUEST, /*!< wait for open/close request */
    ILCK_STATEMACH_OPEN,               /*!< state to open interlock */
    ILCK_STATEMACH_CLOSED,             /*!< state to close interlock */
    ILCK_STATEMACH_UNDEFINED,          /*!< undefined state */
    ILCK_STATEMACH_ERROR,              /*!< Error-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 statemachine
 */
typedef enum {
    ILCK_STATE_INIT_REQUEST,
    ILCK_STATE_OPEN_REQUEST,
    ILCK_STATE_CLOSE_REQUEST,
    ILCK_STATE_ERROR_REQUEST,
    ILCK_STATE_NO_REQUEST,
} ILCK_STATE_REQUEST_e;
 
/**
 * Possible return values when state requests are made to the ILCK statemachine
 */
typedef enum {
    ILCK_OK,                  /*!< ILCK --> ok                             */
    ILCK_BUSY_OK,             /*!< ILCK under load --> ok                  */
    ILCK_REQUEST_PENDING,     /*!< requested to be executed                */
    ILCK_ILLEGAL_REQUEST,     /*!< Request can not be executed             */
    ILCK_INIT_ERROR,          /*!< Error state: Source: Initialization     */
    ILCK_ERROR,               /*!< General error state                     */
    ILCK_ALREADY_INITIALIZED, /*!< Initialization of ilck already finished */
    ILCK_ILLEGAL_TASK_TYPE,   /*!< Illegal                                 */
} 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   Checks the configuration of the interlock-module
 * @return  retVal (type: STD_RETURN_TYPE_e)
 */
extern STD_RETURN_TYPE_e ILCK_Init(void);
 
/**
 * @brief   Reads the feedback pin of the interlock and returns its current value
 *          (ILCK_SWITCH_OFF/ILCK_SWITCH_ON)
 * @return  measuredInterlockState (type: ILCK_ELECTRICAL_STATE_TYPE_e)
 */
extern ILCK_ELECTRICAL_STATE_TYPE_e ILCK_GetInterlockFeedback(void);
 
/**
 * @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);
#endif
 
#endif /* FOXBMS__INTERLOCK_H_ */