can_helper.h

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/**
 * @file    can_helper.h
 * @author  foxBMS Team
 * @date    2021-04-22 (date of creation)
 * @updated 2021-06-24 (date of last update)
 * @ingroup DRIVERS
 * @prefix  CAN
 *
 * @brief   Headers for the helper functions for the CAN module
 *
 *
 */
 
#ifndef FOXBMS__CAN_HELPER_H_
#define FOXBMS__CAN_HELPER_H_
 
/*========== Includes =======================================================*/
#include "general.h"
 
#include "can_cfg.h"
 
/*========== Macros and Definitions =========================================*/
 
/** position for CAN byte 0 to 7
 * @{
 */
#define CAN_BYTE_0_POSITION (0u)
#define CAN_BYTE_1_POSITION (1u)
#define CAN_BYTE_2_POSITION (2u)
#define CAN_BYTE_3_POSITION (3u)
#define CAN_BYTE_4_POSITION (4u)
#define CAN_BYTE_5_POSITION (5u)
#define CAN_BYTE_6_POSITION (6u)
#define CAN_BYTE_7_POSITION (7u)
/**@}*/
 
/** type definition for fields of a CAN signal */
typedef struct CAN_SIGNAL_TYPE {
    uint8_t bitStart;  /*!< start bit of signal in CAN message */
    uint8_t bitLength; /*!< length bit of signal in CAN message */
    float factor;      /*!< scaling factor applied to data */
    float offset;      /*!< offset applied to data */
    float min;         /*!< minimum allowed value for signal */
    float max;         /*!< maximum allowed value for signal */
} CAN_SIGNAL_TYPE_s;
 
/*========== Extern Constant and Variable Declarations ======================*/
 
/*========== Extern Function Prototypes =====================================*/
 
/**
 * @brief   Prepare signal data.
 * This function takes the signal data and
 * applies factor, applies offset and compares
 * with signal minimum and maximum values.
 * @param[in,out] pSignal            signal data
 * @param[in]     signalProperties   signal properties (factor, offset, min, max)
 */
extern void CAN_TxPrepareSignalData(float *pSignal, CAN_SIGNAL_TYPE_s signalProperties);
 
/**
 * @brief   Convert raw signal data.
 * This function takes the raw signal data and
 * applies offset and factor to convert
 * the raw value.
 * @param[out]  pSignalConverted   coverted signal data
 * @param[in]   signalRaw          raw signal data
 * @param[in]   signalProperties   signal properties (factor, offset, min, max)
 */
extern void CAN_RxConvertRawSignalData(float *pSignalConverted, float signalRaw, CAN_SIGNAL_TYPE_s signalProperties);
 
/**
 * @brief   Puts CAN signal data in a 64-bit variable.
 * This function is used to compose a 64-bit CAN message.
 * It takes signal data, signal bit start, signal bit length
 * and puts the data in the 64-bit variable.
 * @param[out]   pMessage    64-bit variable containing the CAN data
 * @param[in]    bitStart    starting bit were the signal data must be put
 * @param[in]    bitLength   length of the signal data to be put in CAN message
 * @param[in]    canSignal   signal data to be put in message
 * @param[in]    endianness  big or little endianness of data
 */
extern void CAN_TxSetMessageDataWithSignalData(
    uint64_t *pMessage,
    uint64_t bitStart,
    uint8_t bitLength,
    uint64_t canSignal,
    CAN_ENDIANNESS_e endianness);
 
/**
 * @brief   Copy CAN data from a 64-bit variable to 8 bytes.
 * This function is used to copy a 64-bit CAN message to 8 bytes.
 * @param[in]    message    64-bit variable containing the CAN data
 * @param[out]   pCanData   8 bytes where the data is copied
 * @param[in]    endianness big or little endianness of data
 */
extern void CAN_TxSetCanDataWithMessageData(uint64_t message, uint8_t *pCanData, CAN_ENDIANNESS_e endianness);
 
/**
 * @brief   Gets CAN signal data from a 64-bit variable.
 * This function is used to get signal data from a 64-bit
 * CAN message.
 * It takes signal bit start, signal bit length and extract
 * signal data from the the 64-bit variable.
 * @param[in]    message     64-bit variable containing the CAN data
 * @param[in]    bitStart    starting bit were the signal data must be put
 * @param[in]    bitLength   length of the signal data to be put in CAN message
 * @param[out]   pCanSignal  signal data to be retrieved from message
 * @param[in]    endianness  big or little endianness of data
 */
extern void CAN_RxGetSignalDataFromMessageData(
    uint64_t message,
    uint64_t bitStart,
    uint8_t bitLength,
    uint64_t *pCanSignal,
    CAN_ENDIANNESS_e endianness);
 
/**
 * @brief   Copy CAN data from 8 bytes to a 64-bit variable.
 * @details This function is used to copy data from a 64-bit variable to 8
 *          bytes.
 * @param[in]    pMessage   64-bit where the data is copied
 * @param[out]   kpkCanData 8 bytes containing the data
 * @param[in]    endianness big or little endianness of data
 */
extern void CAN_RxGetMessageDataFromCanData(
    uint64_t *pMessage,
    const uint8_t *const kpkCanData,
    CAN_ENDIANNESS_e endianness);
 
/*========== Externalized Static Function Implementations (Unit Test) =======*/
 
/*========== Externalized Static Functions Prototypes (Unit Test) ===========*/
 
#endif /* FOXBMS__CAN_HELPER_H_ */