这是与can有关的结构体及注释：
typedef struct
{
CAN_TypeDef *Instance; /*!< Register base address */---这是寄存器的基本地址
CAN_InitTypeDef Init; /*!< CAN required parameters */这是初始化相应的参数
CanTxMsgTypeDef* pTxMsg; /*!< Pointer to transmit structure */----类似于UART的--TX
CanRxMsgTypeDef* pRxMsg; /*!< Pointer to reception structure */类似于UART的--RX
HAL_LockTypeDef Lock; /*!< CAN locking object */
__IO HAL_CAN_StateTypeDef State; /*!< CAN communication state */
__IO HAL_CAN_ErrorTypeDef ErrorCode; /*!< CAN Error code */
}CAN_HandleTypeDef;
CAN∴寄存器地址
typedef struct
{
__IO uint32_t MCR; /*!< CAN master control register, Address offset: 0x00 */
__IO uint32_t MSR; /*!< CAN master status register, Address offset: 0x04 */
__IO uint32_t TSR; /*!< CAN transmit status register, Address offset: 0x08 */
__IO uint32_t RF0R; /*!< CAN receive FIFO 0 register, Address offset: 0x0C */
__IO uint32_t RF1R; /*!< CAN receive FIFO 1 register, Address offset: 0x10 */
__IO uint32_t IER; /*!< CAN interrupt enable register, Address offset: 0x14 */
__IO uint32_t ESR; /*!< CAN error status register, Address offset: 0x18 */
__IO uint32_t BTR; /*!< CAN bit timing register, Address offset: 0x1C */
uint32_t RESERVED0[88]; /*!< Reserved, 0x020 - 0x17F */
CAN_TxMailBox_TypeDef sTxMailBox[3]; /*!< CAN Tx MailBox, Address offset: 0x180 - 0x1AC */
CAN_FIFOMailBox_TypeDef sFIFOMailBox[2]; /*!< CAN FIFO MailBox, Address offset: 0x1B0 - 0x1CC */
uint32_t RESERVED1[12]; /*!< Reserved, 0x1D0 - 0x1FF */
__IO uint32_t FMR; /*!< CAN filter master register, Address offset: 0x200 */
__IO uint32_t FM1R; /*!< CAN filter mode register, Address offset: 0x204 */
uint32_t RESERVED2; /*!< Reserved, 0x208 */
__IO uint32_t FS1R; /*!< CAN filter scale register, Address offset: 0x20C */
uint32_t RESERVED3; /*!< Reserved, 0x210 */
__IO uint32_t FFA1R; /*!< CAN filter FIFO assignment register, Address offset: 0x214 */
uint32_t RESERVED4; /*!< Reserved, 0x218 */
__IO uint32_t FA1R; /*!< CAN filter activation register, Address offset: 0x21C */
uint32_t RESERVED5[8]; /*!< Reserved, 0x220-0x23F */
CAN_FilterRegister_TypeDef sFilterRegister[28]; /*!< CAN Filter Register, Address offset: 0x240-0x31C */
}CAN_TypeDef;
typedef struct
{
__IO uint32_t TIR; /*!< CAN TX mailbox identifier register */
__IO uint32_t TDTR; /*!< CAN mailbox data length control and time stamp register */
__IO uint32_t TDLR; /*!< CAN mailbox data low register */
__IO uint32_t TDHR; /*!< CAN mailbox data high register */
}CAN_TxMailBox_TypeDef;
/**
* @brief Controller Area Network FIFOMailBox
*/
typedef struct
{
__IO uint32_t RIR; /*!< CAN receive FIFO mailbox identifier register */
__IO uint32_t RDTR; /*!< CAN receive FIFO mailbox data length control and time stamp register */
__IO uint32_t RDLR; /*!< CAN receive FIFO mailbox data low register */
__IO uint32_t RDHR; /*!< CAN receive FIFO mailbox data high register */
}CAN_FIFOMailBox_TypeDef;
/**
* @brief Controller Area Network FilterRegister
*/
typedef struct
{
__IO uint32_t FR1; /*!< CAN Filter bank register 1 */
__IO uint32_t FR2; /*!< CAN Filter bank register 1 */
}CAN_FilterRegister_TypeDef;
typedef struct
{
uint32_t Prescaler; /*!< Specifies the length of a time quantum.
This parameter must be a number between Min_Data = 1 and Max_Data = 1024. */
uint32_t Mode; /*!< Specifies the CAN operating mode.
This parameter can be a value of @ref CAN_operating_mode */
uint32_t SJW; /*!< Specifies the maximum number of time quanta
the CAN hardware is allowed to lengthen or
shorten a bit to perform resynchronization.
This parameter can be a value of @ref CAN_synchronisation_jump_width */
uint32_t BS1; /*!< Specifies the number of time quanta in Bit Segment 1.
This parameter can be a value of @ref CAN_time_quantum_in_bit_segment_1 */
uint32_t BS2; /*!< Specifies the number of time quanta in Bit Segment 2.
This parameter can be a value of @ref CAN_time_quantum_in_bit_segment_2 */
uint32_t TTCM; /*!< Enable or disable the time triggered communication mode.
This parameter can be set to ENABLE or DISABLE. */
uint32_t ABOM; /*!< Enable or disable the automatic bus-off management.
This parameter can be set to ENABLE or DISABLE. */
uint32_t AWUM; /*!< Enable or disable the automatic wake-up mode.
This parameter can be set to ENABLE or DISABLE. */
uint32_t NART; /*!< Enable or disable the non-automatic retransmission mode.
This parameter can be set to ENABLE or DISABLE. */
uint32_t RFLM; /*!< Enable or disable the Receive FIFO Locked mode.
This parameter can be set to ENABLE or DISABLE. */
uint32_t TXFP; /*!< Enable or disable the transmit FIFO priority.
This parameter can be set to ENABLE or DISABLE. */
}CAN_InitTypeDef;
typedef struct
{
uint32_t StdId; /*!< Specifies the standard identifier.
This parameter must be a number between Min_Data = 0 and Max_Data = 0x7FF. */
uint32_t ExtId; /*!< Specifies the extended identifier.
This parameter must be a number between Min_Data = 0 and Max_Data = 0x1FFFFFFF. */
uint32_t IDE; /*!< Specifies the type of identifier for the message that will be transmitted.
This parameter can be a value of @ref CAN_identifier_type */
uint32_t RTR; /*!< Specifies the type of frame for the message that will be transmitted.
This parameter can be a value of @ref CAN_remote_transmission_request */
uint32_t DLC; /*!< Specifies the length of the frame that will be transmitted.
This parameter must be a number between Min_Data = 0 and Max_Data = 8. */
uint32_t Data[8]; /*!< Contains the data to be transmitted.
This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */
}CanTxMsgTypeDef;
typedef struct
{
uint32_t StdId; /*!< Specifies the standard identifier.
This parameter must be a number between Min_Data = 0 and Max_Data = 0x7FF. */
uint32_t ExtId; /*!< Specifies the extended identifier.
This parameter must be a number between Min_Data = 0 and Max_Data = 0x1FFFFFFF. */
uint32_t IDE; /*!< Specifies the type of identifier for the message that will be received.
This parameter can be a value of @ref CAN_identifier_type */
uint32_t RTR; /*!< Specifies the type of frame for the received message.
This parameter can be a value of @ref CAN_remote_transmission_request */
uint32_t DLC; /*!< Specifies the length of the frame that will be received.
This parameter must be a number between Min_Data = 0 and Max_Data = 8. */
uint32_t Data[8]; /*!< Contains the data to be received.
This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */
uint32_t FMI; /*!< Specifies the index of the filter the message stored in the mailbox passes through.
This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */
uint32_t FIFONumber; /*!< Specifies the receive FIFO number.
This parameter can be CAN_FIFO0 or CAN_FIFO1 */
}CanRxMsgTypeDef;
还有CAN异步跳转的数据宽度
#define CAN_SJW_1TQ ((uint32_t)0x00000000) /*!< 1 time quantum */
#define CAN_SJW_2TQ ((uint32_t)CAN_BTR_SJW_0) /*!< 2 time quantum */
#define CAN_SJW_3TQ ((uint32_t)CAN_BTR_SJW_1) /*!< 3 time quantum */
#define CAN_SJW_4TQ ((uint32_t)CAN_BTR_SJW) /*!< 4 time quantum */
typedef struct
{
uint32_t StdId; /*!< Specifies the standard identifier.
This parameter must be a number between Min_Data = 0 and Max_Data = 0x7FF. */
uint32_t ExtId; /*!< Specifies the extended identifier.
This parameter must be a number between Min_Data = 0 and Max_Data = 0x1FFFFFFF. */
uint32_t IDE; /*!< Specifies the type of identifier for the message that will be received.
This parameter can be a value of @ref CAN_identifier_type */
uint32_t RTR; /*!< Specifies the type of frame for the received message.
This parameter can be a value of @ref CAN_remote_transmission_request */
uint32_t DLC; /*!< Specifies the length of the frame that will be received.
This parameter must be a number between Min_Data = 0 and Max_Data = 8. */
uint32_t Data[8]; /*!< Contains the data to be received.
This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */
uint32_t FMI; /*!< Specifies the index of the filter the message stored in the mailbox passes through.
This parameter must be a number between Min_Data = 0 and Max_Data = 0xFF. */
uint32_t FIFONumber; /*!< Specifies the receive FIFO number.
This parameter can be CAN_FIFO0 or CAN_FIFO1 */
}CanRxMsgTypeDef;
这是CAN有关接收数据的参数
还有其他的数据结构定义，不过先回来看我的INIT函数
HAL_StatusTypeDef HAL_CAN_Init(CAN_HandleTypeDef* hcan)
{
uint32_t status = CAN_INITSTATUS_FAILED; /* Default init status */
uint32_t tickstart = 0;
/* Check CAN handle */
if(hcan == NULL)
{
return HAL_ERROR;
}
/* Check the parameters */
assert_param(IS_CAN_ALL_INSTANCE(hcan->Instance));
assert_param(IS_FUNCTIONAL_STATE(hcan->Init.TTCM));
assert_param(IS_FUNCTIONAL_STATE(hcan->Init.ABOM));
assert_param(IS_FUNCTIONAL_STATE(hcan->Init.AWUM));
assert_param(IS_FUNCTIONAL_STATE(hcan->Init.NART));
assert_param(IS_FUNCTIONAL_STATE(hcan->Init.RFLM));
assert_param(IS_FUNCTIONAL_STATE(hcan->Init.TXFP));
assert_param(IS_CAN_MODE(hcan->Init.Mode));
assert_param(IS_CAN_SJW(hcan->Init.SJW));
assert_param(IS_CAN_BS1(hcan->Init.BS1));
assert_param(IS_CAN_BS2(hcan->Init.BS2));
assert_param(IS_CAN_PRESCALER(hcan->Init.Prescaler));
if(hcan->State == HAL_CAN_STATE_RESET)
{
/* Init the low level hardware */
HAL_CAN_MspInit(hcan);
}
/* Initialize the CAN state*/
hcan->State = HAL_CAN_STATE_BUSY;
/* Exit from sleep mode */
hcan->Instance->MCR &= (~(uint32_t)CAN_MCR_SLEEP);
/* Request initialisation */
hcan->Instance->MCR |= CAN_MCR_INRQ ;
/* Get tickstart */
tickstart = HAL_GetTick();
/* Wait the acknowledge */
while((hcan->Instance->MSR & CAN_MSR_INAK) != CAN_MSR_INAK)
{
if((HAL_GetTick() - tickstart) > HAL_CAN_DEFAULT_TIMEOUT)
{
hcan->State= HAL_CAN_STATE_TIMEOUT;
return HAL_TIMEOUT;
}
}
/* Check acknowledge */
if ((hcan->Instance->MSR & CAN_MSR_INAK) == CAN_MSR_INAK)
{
/* Set the time triggered communication mode */
if (hcan->Init.TTCM == ENABLE)
{
hcan->Instance->MCR |= CAN_MCR_TTCM;
}
else
{
hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_TTCM;
}
/* Set the automatic bus-off management */
if (hcan->Init.ABOM == ENABLE)
{
hcan->Instance->MCR |= CAN_MCR_ABOM;
}
else
{
hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_ABOM;
}
/* Set the automatic wake-up mode */
if (hcan->Init.AWUM == ENABLE)
{
hcan->Instance->MCR |= CAN_MCR_AWUM;
}
else
{
hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_AWUM;
}
/* Set the no automatic retransmission */
if (hcan->Init.NART == ENABLE)
{
hcan->Instance->MCR |= CAN_MCR_NART;
}
else
{
hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_NART;
}
/* Set the receive FIFO locked mode */
if (hcan->Init.RFLM == ENABLE)
{
hcan->Instance->MCR |= CAN_MCR_RFLM;
}
else
{
hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_RFLM;
}
/* Set the transmit FIFO priority */
if (hcan->Init.TXFP == ENABLE)
{
hcan->Instance->MCR |= CAN_MCR_TXFP;
}
else
{
hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_TXFP;
}
/* Set the bit timing register */
hcan->Instance->BTR = (uint32_t)((uint32_t)hcan->Init.Mode) |
((uint32_t)hcan->Init.SJW) |
((uint32_t)hcan->Init.BS1) |
((uint32_t)hcan->Init.BS2) |
((uint32_t)hcan->Init.Prescaler - 1);
/* Request leave initialisation */
hcan->Instance->MCR &= ~(uint32_t)CAN_MCR_INRQ;
/* Get timeout */
tickstart = HAL_GetTick();
/* Wait the acknowledge */
while((hcan->Instance->MSR & CAN_MSR_INAK) == CAN_MSR_INAK)
{
if((HAL_GetTick() - tickstart) > HAL_CAN_DEFAULT_TIMEOUT)
{
hcan->State= HAL_CAN_STATE_TIMEOUT;
return HAL_TIMEOUT;
}
}
/* Check acknowledged */
if ((hcan->Instance->MSR & CAN_MSR_INAK) != CAN_MSR_INAK)
{
status = CAN_INITSTATUS_SUCCESS;
}
}
if(status == CAN_INITSTATUS_SUCCESS)
{
/* Set CAN error code to none */
hcan->ErrorCode = HAL_CAN_ERROR_NONE;
/* Initialize the CAN state */
hcan->State = HAL_CAN_STATE_READY;
/* Return function status */
return HAL_OK;
}
else
{
/* Initialize the CAN state */
hcan->State = HAL_CAN_STATE_ERROR;
/* Return function status */
return HAL_ERROR;
}
}