CAN Bus Error management functions

CAN Bus Error management functions. More...

Collaboration diagram for CAN Bus Error management functions:

Functions
uint8_t	CAN_GetLastErrorCode (CAN_TypeDef *CANx)
	Returns the CANx's last error code (LEC). More...
uint8_t	CAN_GetLSBTransmitErrorCounter (CAN_TypeDef *CANx)
	Returns the LSB of the 9-bit CANx Transmit Error Counter(TEC). More...
uint8_t	CAN_GetReceiveErrorCounter (CAN_TypeDef *CANx)
	Returns the CANx Receive Error Counter (REC). More...

Detailed Description

CAN Bus Error management functions.

 ===============================================================================
                ##### CAN Bus Error management functions #####
 ===============================================================================
    [..] This section provides functions allowing to
      (+) Return the CANx's last error code (LEC)
      (+) Return the CANx Receive Error Counter (REC)
      (+) Return the LSB of the 9-bit CANx Transmit Error Counter(TEC).

      -@- If TEC is greater than 255, The CAN is in bus-off state.
      -@- if REC or TEC are greater than 96, an Error warning flag occurs.
      -@- if REC or TEC are greater than 127, an Error Passive Flag occurs.

 ===============================================================================
                  ##### CAN Bus Error management functions #####
 ===============================================================================  
    [..] This section provides functions allowing to 
         (+) Return the CANx's last error code (LEC).
         (+) Return the CANx Receive Error Counter (REC).
         (+) Return the LSB of the 9-bit CANx Transmit Error Counter(TEC).
    [..]
         (@) If TEC is greater than 255, The CAN is in bus-off state.
         (@) If REC or TEC are greater than 96, an Error warning flag occurs.
         (@) If REC or TEC are greater than 127, an Error Passive Flag occurs.

Function Documentation

uint8_t CAN_GetLastErrorCode

(

CAN_TypeDef *

CANx

)

Returns the CANx's last error code (LEC).

Parameters

CANx	where x can be 1 or 2 to select the CAN peripheral.

Return values

Error

code: CAN_ERRORCODE_NoErr: No Error CAN_ERRORCODE_StuffErr: Stuff Error CAN_ERRORCODE_FormErr: Form Error CAN_ERRORCODE_ACKErr : Acknowledgment Error CAN_ERRORCODE_BitRecessiveErr: Bit Recessive Error CAN_ERRORCODE_BitDominantErr: Bit Dominant Error CAN_ERRORCODE_CRCErr: CRC Error CAN_ERRORCODE_SoftwareSetErr: Software Set Error

Parameters

CANx	where x can be 1 to select the CAN1 peripheral.

Return values

Error

code: CAN_ERRORCODE_NoErr: No Error CAN_ERRORCODE_StuffErr: Stuff Error CAN_ERRORCODE_FormErr: Form Error CAN_ERRORCODE_ACKErr : Acknowledgment Error CAN_ERRORCODE_BitRecessiveErr: Bit Recessive Error CAN_ERRORCODE_BitDominantErr: Bit Dominant Error CAN_ERRORCODE_CRCErr: CRC Error CAN_ERRORCODE_SoftwareSetErr: Software Set Error

Definition at line 1040 of file stm32f4xx_can.c.

uint8_t CAN_GetLSBTransmitErrorCounter

(

CAN_TypeDef *

CANx

)

Returns the LSB of the 9-bit CANx Transmit Error Counter(TEC).

Parameters

CANx	where x can be 1 or 2 to to select the CAN peripheral.

Return values

LSB	of the 9-bit CAN Transmit Error Counter.

Definition at line 1085 of file stm32f4xx_can.c.

uint8_t CAN_GetReceiveErrorCounter

(

CAN_TypeDef *

CANx

)

Returns the CANx Receive Error Counter (REC).

Note

In case of an error during reception, this counter is incremented by 1 or by 8 depending on the error condition as defined by the CAN standard. After every successful reception, the counter is decremented by 1 or reset to 120 if its value was higher than 128. When the counter value exceeds 127, the CAN controller enters the error passive state.

Parameters

CANx	where x can be 1 or 2 to to select the CAN peripheral.

Return values

CAN	Receive Error Counter.

Definition at line 1065 of file stm32f4xx_can.c.