#ifndef BSP_CAN_H
#define BSP_CAN_H

#include <stdint-gcc.h>
#include "can.h"

#define MX_REGISTER_DEVICE_CNT 12  // maximum number of device can be registered to CAN service
                                   // this number depends on the load of CAN bus.
#define MX_CAN_FILTER_CNT (2 * 14) // temporarily useless
#define DEVICE_CAN_CNT 2           // CAN1,CAN2


/* can instance typedef, every module registered to CAN should have this variable */
#pragma pack(1)
typedef struct _
{
    CAN_HandleTypeDef *can_handle;
    CAN_TxHeaderTypeDef txconf;
    uint32_t tx_id;
    uint32_t tx_mailbox;
    uint8_t tx_buff[8];
    uint8_t rx_buff[8];
    uint32_t rx_id;
    uint8_t rx_len;
    void (*can_module_callback)(struct _ *); // callback needs an instance to tell among registered ones
} can_instance;
#pragma pack()

/* this structure is used as initialization*/
typedef struct
{
    CAN_HandleTypeDef *can_handle;
    uint32_t tx_id;
    uint32_t rx_id;
    void (*can_module_callback)(can_instance *);
} can_instance_config_s;

/* module callback,which resolve protocol when new mesg arrives */
typedef void (*can_callback)(can_instance*);

/**
 * @brief transmit mesg through CAN device
 *
 * @param _instance can instance owned by module
 */
void CANTransmit(can_instance *_instance);

/**
 * @brief Register a module to CAN service,remember to call this before using a CAN device
 *
 * @param config init config
 * @return can_instance* can instance owned by module
 */
can_instance* CANRegister(can_instance_config_s *config);

/**
 * @brief 修改CAN发送报文的数据帧长度;注意最大长度为8,在没有进行修改的时候,默认长度为8
 *
 * @param _instance 要修改长度的can实例
 * @param length    设定长度
 */
void CANSetDLC(can_instance *_instance, uint8_t length);

#endif