stm32 can 滤波器CAN_FilterConfTypeDef 之BankNumber

/**
  * @brief  CAN filter configuration structure definition
  */
typedef struct
{
  uint32_t FilterIdHigh;          /*!< Specifies the filter identification number (MSBs for a 32-bit
                                       configuration, first one for a 16-bit configuration).
                                       This parameter must be a number between Min_Data = 0x0000U and Max_Data = 0xFFFFU */


  uint32_t FilterIdLow;           /*!< Specifies the filter identification number (LSBs for a 32-bit
                                       configuration, second one for a 16-bit configuration).
                                       This parameter must be a number between Min_Data = 0x0000U and Max_Data = 0xFFFFU */


  uint32_t FilterMaskIdHigh;      /*!< Specifies the filter mask number or identification number,
                                       according to the mode (MSBs for a 32-bit configuration,
                                       first one for a 16-bit configuration).
                                       This parameter must be a number between Min_Data = 0x0000U and Max_Data = 0xFFFFU */


  uint32_t FilterMaskIdLow;       /*!< Specifies the filter mask number or identification number,
                                       according to the mode (LSBs for a 32-bit configuration,
                                       second one for a 16-bit configuration).
                                       This parameter must be a number between Min_Data = 0x0000U and Max_Data = 0xFFFFU */


  uint32_t FilterFIFOAssignment;  /*!< Specifies the FIFO (0 or 1) which will be assigned to the filter.
                                       This parameter can be a value of @ref CAN_filter_FIFO */


  uint32_t FilterNumber;          /*!< Specifies the filter which will be initialized.
                                       This parameter must be a number between Min_Data = 0 and Max_Data = 27 */


  uint32_t FilterMode;            /*!< Specifies the filter mode to be initialized.
                                       This parameter can be a value of @ref CAN_filter_mode */


  uint32_t FilterScale;           /*!< Specifies the filter scale.
                                       This parameter can be a value of @ref CAN_filter_scale */


  uint32_t FilterActivation;      /*!< Enable or disable the filter.
                                       This parameter can be set to ENABLE or DISABLE. */


  uint32_t BankNumber;            /*!< Select the start slave bank filter.
                                       This parameter must be a number between Min_Data = 0 and Max_Data = 28 */

}CAN_FilterConfTypeDef;

sFilterConfig.FilterNumber = m;   //……【1】

sFilterConfig.BankNumber  = n;   //……【2】

第【1】句代码就是选择某过滤器组进行初始化并配置接收过滤器。对于双CAN产品，m的值为0到27。对于单CAN产品而言，m的值为0~13。

第【2】句代码针对双CAN的STM32产品，配置CAN2可使用的过滤器组的起始编号，n取值范围为0~28.从编号为n的过滤器组到编号为27的过滤器组分配给CAN2使用。通过配置寄存器CAN2SB[5:0]@CAN_FRM确定。如果第【2】句配置不在代码中明确写出来，默认值就是14. 即硬件默认将编号为14起往后的过滤器组分配给CAN2使用。