Interrupts and flags management functions

Interrupts and flags management functions. More...

Collaboration diagram for Interrupts and flags management functions:

Functions
void	CAN_ClearFlag (CAN_TypeDef *CANx, uint32_t CAN_FLAG)
	Clears the CAN's pending flags. More...
void	CAN_ClearITPendingBit (CAN_TypeDef *CANx, uint32_t CAN_IT)
	Clears the CANx's interrupt pending bits. More...
FlagStatus	CAN_GetFlagStatus (CAN_TypeDef *CANx, uint32_t CAN_FLAG)
	Checks whether the specified CAN flag is set or not. More...
ITStatus	CAN_GetITStatus (CAN_TypeDef *CANx, uint32_t CAN_IT)
	Checks whether the specified CANx interrupt has occurred or not. More...
void	CAN_ITConfig (CAN_TypeDef *CANx, uint32_t CAN_IT, FunctionalState NewState)
	Enables or disables the specified CANx interrupts. More...

Detailed Description

Interrupts and flags management functions.

 ===============================================================================
              ##### Interrupts and flags management functions #####
 ===============================================================================  

     [..] This section provides functions allowing to configure the CAN Interrupts 
          and to get the status and clear flags and Interrupts pending bits.
  
          The CAN provides 14 Interrupts sources and 15 Flags:

   
  *** Flags ***
  =============
    [..] The 15 flags can be divided on 4 groups: 

      (+) Transmit Flags
        (++) CAN_FLAG_RQCP0, 
        (++) CAN_FLAG_RQCP1, 
        (++) CAN_FLAG_RQCP2  : Request completed MailBoxes 0, 1 and 2  Flags
                               Set when when the last request (transmit or abort)
                               has been performed. 

      (+) Receive Flags


        (++) CAN_FLAG_FMP0,
        (++) CAN_FLAG_FMP1   : FIFO 0 and 1 Message Pending Flags 
                               set to signal that messages are pending in the receive 
                               FIFO.
                               These Flags are cleared only by hardware. 

        (++) CAN_FLAG_FF0,
        (++) CAN_FLAG_FF1    : FIFO 0 and 1 Full Flags
                               set when three messages are stored in the selected 
                               FIFO.                        

        (++) CAN_FLAG_FOV0              
        (++) CAN_FLAG_FOV1   : FIFO 0 and 1 Overrun Flags
                               set when a new message has been received and passed 
                               the filter while the FIFO was full.         

      (+) Operating Mode Flags

        (++) CAN_FLAG_WKU    : Wake up Flag
                               set to signal that a SOF bit has been detected while 
                               the CAN hardware was in Sleep mode. 
        
        (++) CAN_FLAG_SLAK   : Sleep acknowledge Flag
                               Set to signal that the CAN has entered Sleep Mode. 
    
      (+) Error Flags

        (++) CAN_FLAG_EWG    : Error Warning Flag
                               Set when the warning limit has been reached (Receive 
                               Error Counter or Transmit Error Counter greater than 96). 
                               This Flag is cleared only by hardware.
                            
        (++) CAN_FLAG_EPV    : Error Passive Flag
                               Set when the Error Passive limit has been reached 
                               (Receive Error Counter or Transmit Error Counter 
                               greater than 127).
                               This Flag is cleared only by hardware.
                             
        (++) CAN_FLAG_BOF    : Bus-Off Flag
                               set when CAN enters the bus-off state. The bus-off 
                               state is entered on TEC overflow, greater than 255.
                               This Flag is cleared only by hardware.
                                   
        (++) CAN_FLAG_LEC    : Last error code Flag
                               set If a message has been transferred (reception or
                               transmission) with error, and the error code is hold.              
                           
  *** Interrupts ***
  ==================
    [..] The 14 interrupts can be divided on 4 groups: 
  
      (+) Transmit interrupt
  
        (++) CAN_IT_TME   :  Transmit mailbox empty Interrupt
                             if enabled, this interrupt source is pending when 
                             no transmit request are pending for Tx mailboxes.      

      (+) Receive Interrupts
         
        (++) CAN_IT_FMP0,
        (++) CAN_IT_FMP1    :  FIFO 0 and FIFO1 message pending Interrupts
                               if enabled, these interrupt sources are pending 
                               when messages are pending in the receive FIFO.
                               The corresponding interrupt pending bits are cleared 
                               only by hardware.
                
        (++) CAN_IT_FF0,              
        (++) CAN_IT_FF1     :  FIFO 0 and FIFO1 full Interrupts
                               if enabled, these interrupt sources are pending 
                               when three messages are stored in the selected FIFO.
        
        (++) CAN_IT_FOV0,        
        (++) CAN_IT_FOV1    :  FIFO 0 and FIFO1 overrun Interrupts        
                               if enabled, these interrupt sources are pending 
                               when a new message has been received and passed 
                               the filter while the FIFO was full.

      (+) Operating Mode Interrupts
         
        (++) CAN_IT_WKU     :  Wake-up Interrupt
                               if enabled, this interrupt source is pending when 
                               a SOF bit has been detected while the CAN hardware 
                               was in Sleep mode.
                                  
        (++) CAN_IT_SLK     :  Sleep acknowledge Interrupt
                               if enabled, this interrupt source is pending when 
                               the CAN has entered Sleep Mode.       

      (+) Error Interrupts 
        
        (++) CAN_IT_EWG     :  Error warning Interrupt 
                               if enabled, this interrupt source is pending when
                               the warning limit has been reached (Receive Error 
                               Counter or Transmit Error Counter=96). 
                               
        (++) CAN_IT_EPV     :  Error passive Interrupt        
                               if enabled, this interrupt source is pending when
                               the Error Passive limit has been reached (Receive 
                               Error Counter or Transmit Error Counter>127).
                          
        (++) CAN_IT_BOF     :  Bus-off Interrupt
                               if enabled, this interrupt source is pending when
                               CAN enters the bus-off state. The bus-off state is 
                               entered on TEC overflow, greater than 255.
                               This Flag is cleared only by hardware.
                                  
        (++) CAN_IT_LEC     :  Last error code Interrupt        
                               if enabled, this interrupt source is pending  when
                               a message has been transferred (reception or
                               transmission) with error, and the error code is hold.
                          
        (++) CAN_IT_ERR     :  Error Interrupt
                               if enabled, this interrupt source is pending when 
                               an error condition is pending.      
                      
    [..] Managing the CAN controller events :
 
         The user should identify which mode will be used in his application to 
         manage the CAN controller events: Polling mode or Interrupt mode.
  
      (#) In the Polling Mode it is advised to use the following functions:
        (++) CAN_GetFlagStatus() : to check if flags events occur. 
        (++) CAN_ClearFlag()     : to clear the flags events.
  

  
      (#) In the Interrupt Mode it is advised to use the following functions:
        (++) CAN_ITConfig()       : to enable or disable the interrupt source.
        (++) CAN_GetITStatus()    : to check if Interrupt occurs.
        (++) CAN_ClearITPendingBit() : to clear the Interrupt pending Bit 
            (corresponding Flag).
        -@@-  This function has no impact on CAN_IT_FMP0 and CAN_IT_FMP1 Interrupts 
             pending bits since there are cleared only by hardware. 

 ===============================================================================
              ##### Interrupts and flags management functions #####
 ===============================================================================  
    [..] This section provides functions allowing to configure the CAN Interrupts 
         and to get the status and clear flags and Interrupts pending bits.
    [..] The CAN provides 14 Interrupts sources and 15 Flags:
   
  *** Flags ***
  =============
    [..] The 15 flags can be divided on 4 groups: 
         (+) Transmit Flags:
             (++) CAN_FLAG_RQCP0. 
             (++) CAN_FLAG_RQCP1. 
             (++) CAN_FLAG_RQCP2: Request completed MailBoxes 0, 1 and 2  Flags
                  Set when when the last request (transmit or abort) has 
                  been performed. 
         (+) Receive Flags:
             (++) CAN_FLAG_FMP0.
             (++) CAN_FLAG_FMP1: FIFO 0 and 1 Message Pending Flags; 
                  Set to signal that messages are pending in the receive FIFO.
                  These Flags are cleared only by hardware. 
             (++) CAN_FLAG_FF0.
             (++) CAN_FLAG_FF1: FIFO 0 and 1 Full Flags; 
                  Set when three messages are stored in the selected FIFO.                        
             (++) CAN_FLAG_FOV0.              
             (++) CAN_FLAG_FOV1: FIFO 0 and 1 Overrun Flags; 
                  Set when a new message has been received and passed the filter 
                  while the FIFO was full.         
         (+) Operating Mode Flags: 
             (++) CAN_FLAG_WKU: Wake up Flag; 
                  Set to signal that a SOF bit has been detected while the CAN 
                  hardware was in Sleep mode. 
             (++) CAN_FLAG_SLAK: Sleep acknowledge Flag;
                  Set to signal that the CAN has entered Sleep Mode. 
         (+) Error Flags:  
             (++) CAN_FLAG_EWG: Error Warning Flag;
                  Set when the warning limit has been reached (Receive Error Counter 
                  or Transmit Error Counter greater than 96). 
                  This Flag is cleared only by hardware.
             (++) CAN_FLAG_EPV: Error Passive Flag;
                  Set when the Error Passive limit has been reached (Receive Error 
                  Counter or Transmit Error Counter greater than 127).
                  This Flag is cleared only by hardware.
             (++) CAN_FLAG_BOF: Bus-Off Flag;
                  Set when CAN enters the bus-off state. The bus-off state is 
                  entered on TEC overflow, greater than 255.
                  This Flag is cleared only by hardware.
             (++) CAN_FLAG_LEC: Last error code Flag;
                  Set If a message has been transferred (reception or transmission) 
                  with error, and the error code is hold.                      
  
  *** Interrupts ***
  ==================
    [..] The 14 interrupts can be divided on 4 groups: 
         (+) Transmit interrupt:   
             (++) CAN_IT_TME: Transmit mailbox empty Interrupt;
                  If enabled, this interrupt source is pending when no transmit 
                  request are pending for Tx mailboxes.      
         (+) Receive Interrupts:   
             (++) CAN_IT_FMP0.
             (++) CAN_IT_FMP1: FIFO 0 and FIFO1 message pending Interrupts;
                  If enabled, these interrupt sources are pending when messages 
                  are pending in the receive FIFO.
                  The corresponding interrupt pending bits are cleared only by hardware.
             (++) CAN_IT_FF0.              
             (++) CAN_IT_FF1: FIFO 0 and FIFO1 full Interrupts;
                  If enabled, these interrupt sources are pending when three messages 
                  are stored in the selected FIFO.
             (++) CAN_IT_FOV0.        
             (++) CAN_IT_FOV1: FIFO 0 and FIFO1 overrun Interrupts;        
                  If enabled, these interrupt sources are pending when a new message 
                  has been received and passed the filter while the FIFO was full.
         (+) Operating Mode Interrupts:    
             (++) CAN_IT_WKU: Wake-up Interrupt;
                  If enabled, this interrupt source is pending when a SOF bit has 
                  been detected while the CAN hardware was in Sleep mode.
             (++) CAN_IT_SLK: Sleep acknowledge Interrupt:
                  If enabled, this interrupt source is pending when the CAN has 
                  entered Sleep Mode.       
         (+) Error Interrupts:     
             (++) CAN_IT_EWG: Error warning Interrupt; 
                  If enabled, this interrupt source is pending when the warning limit 
                  has been reached (Receive Error Counter or Transmit Error Counter=96). 
             (++) CAN_IT_EPV: Error passive Interrupt;        
                  If enabled, this interrupt source is pending when the Error Passive 
                  limit has been reached (Receive Error Counter or Transmit Error Counter>127).
             (++) CAN_IT_BOF: Bus-off Interrupt;
                  If enabled, this interrupt source is pending when CAN enters 
                  the bus-off state. The bus-off state is entered on TEC overflow, 
                  greater than 255.
                  This Flag is cleared only by hardware.
             (++) CAN_IT_LEC: Last error code Interrupt;        
                  If enabled, this interrupt source is pending when a message has 
                  been transferred (reception or transmission) with error and the 
                  error code is hold.
             (++) CAN_IT_ERR: Error Interrupt;
                  If enabled, this interrupt source is pending when an error condition 
                  is pending.      
    [..] Managing the CAN controller events: 
         The user should identify which mode will be used in his application to manage 
         the CAN controller events: Polling mode or Interrupt mode.
         (+) In the Polling Mode it is advised to use the following functions:
             (++) CAN_GetFlagStatus() : to check if flags events occur. 
             (++) CAN_ClearFlag()     : to clear the flags events.
         (+) In the Interrupt Mode it is advised to use the following functions:
             (++) CAN_ITConfig()       : to enable or disable the interrupt source.
             (++) CAN_GetITStatus()    : to check if Interrupt occurs.
             (++) CAN_ClearITPendingBit() : to clear the Interrupt pending Bit 
                  (corresponding Flag).
                  This function has no impact on CAN_IT_FMP0 and CAN_IT_FMP1 Interrupts 
                  pending bits since there are cleared only by hardware. 

Function Documentation

void CAN_ClearFlag	(	CAN_TypeDef *	CANx,
		uint32_t	CAN_FLAG
	)

Clears the CAN's pending flags.

Parameters

CANx

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

CAN_FLAG

specifies the flag to clear. This parameter can be one of the following values: CAN_FLAG_RQCP0: Request MailBox0 Flag CAN_FLAG_RQCP1: Request MailBox1 Flag CAN_FLAG_RQCP2: Request MailBox2 Flag CAN_FLAG_FF0: FIFO 0 Full Flag CAN_FLAG_FOV0: FIFO 0 Overrun Flag CAN_FLAG_FF1: FIFO 1 Full Flag CAN_FLAG_FOV1: FIFO 1 Overrun Flag CAN_FLAG_WKU: Wake up Flag CAN_FLAG_SLAK: Sleep acknowledge Flag CAN_FLAG_LEC: Last error code Flag

Return values

None

Definition at line 1430 of file stm32f4xx_can.c.

void CAN_ClearITPendingBit	(	CAN_TypeDef *	CANx,
		uint32_t	CAN_IT
	)

Clears the CANx's interrupt pending bits.

Parameters

CANx

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

CAN_IT

specifies the interrupt pending bit to clear. This parameter can be one of the following values: CAN_IT_TME: Transmit mailbox empty Interrupt CAN_IT_FF0: FIFO 0 full Interrupt CAN_IT_FOV0: FIFO 0 overrun Interrupt CAN_IT_FF1: FIFO 1 full Interrupt CAN_IT_FOV1: FIFO 1 overrun Interrupt CAN_IT_WKU: Wake-up Interrupt CAN_IT_SLK: Sleep acknowledge Interrupt CAN_IT_EWG: Error warning Interrupt CAN_IT_EPV: Error passive Interrupt CAN_IT_BOF: Bus-off Interrupt CAN_IT_LEC: Last error code Interrupt CAN_IT_ERR: Error Interrupt

Return values

None

Definition at line 1594 of file stm32f4xx_can.c.

FlagStatus CAN_GetFlagStatus	(	CAN_TypeDef *	CANx,
		uint32_t	CAN_FLAG
	)

Checks whether the specified CAN flag is set or not.

Parameters

CANx

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

CAN_FLAG

specifies the flag to check. This parameter can be one of the following values: CAN_FLAG_RQCP0: Request MailBox0 Flag CAN_FLAG_RQCP1: Request MailBox1 Flag CAN_FLAG_RQCP2: Request MailBox2 Flag CAN_FLAG_FMP0: FIFO 0 Message Pending Flag CAN_FLAG_FF0: FIFO 0 Full Flag CAN_FLAG_FOV0: FIFO 0 Overrun Flag CAN_FLAG_FMP1: FIFO 1 Message Pending Flag CAN_FLAG_FF1: FIFO 1 Full Flag CAN_FLAG_FOV1: FIFO 1 Overrun Flag CAN_FLAG_WKU: Wake up Flag CAN_FLAG_SLAK: Sleep acknowledge Flag CAN_FLAG_EWG: Error Warning Flag CAN_FLAG_EPV: Error Passive Flag CAN_FLAG_BOF: Bus-Off Flag CAN_FLAG_LEC: Last error code Flag

Return values

The	new state of CAN_FLAG (SET or RESET).

Definition at line 1330 of file stm32f4xx_can.c.

ITStatus CAN_GetITStatus	(	CAN_TypeDef *	CANx,
		uint32_t	CAN_IT
	)

Checks whether the specified CANx interrupt has occurred or not.

Parameters

CANx

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

CAN_IT

specifies the CAN interrupt source to check. This parameter can be one of the following values: CAN_IT_TME: Transmit mailbox empty Interrupt CAN_IT_FMP0: FIFO 0 message pending Interrupt CAN_IT_FF0: FIFO 0 full Interrupt CAN_IT_FOV0: FIFO 0 overrun Interrupt CAN_IT_FMP1: FIFO 1 message pending Interrupt CAN_IT_FF1: FIFO 1 full Interrupt CAN_IT_FOV1: FIFO 1 overrun Interrupt CAN_IT_WKU: Wake-up Interrupt CAN_IT_SLK: Sleep acknowledge Interrupt CAN_IT_EWG: Error warning Interrupt CAN_IT_EPV: Error passive Interrupt CAN_IT_BOF: Bus-off Interrupt CAN_IT_LEC: Last error code Interrupt CAN_IT_ERR: Error Interrupt

Return values

The	current state of CAN_IT (SET or RESET).

Definition at line 1490 of file stm32f4xx_can.c.

void CAN_ITConfig	(	CAN_TypeDef *	CANx,
		uint32_t	CAN_IT,
		FunctionalState	NewState
	)

Enables or disables the specified CANx interrupts.

Parameters

CANx	where x can be 1 or 2 to to select the CAN peripheral.
CAN_IT	specifies the CAN interrupt sources to be enabled or disabled. This parameter can be: CAN_IT_TME: Transmit mailbox empty Interrupt CAN_IT_FMP0: FIFO 0 message pending Interrupt CAN_IT_FF0: FIFO 0 full Interrupt CAN_IT_FOV0: FIFO 0 overrun Interrupt CAN_IT_FMP1: FIFO 1 message pending Interrupt CAN_IT_FF1: FIFO 1 full Interrupt CAN_IT_FOV1: FIFO 1 overrun Interrupt CAN_IT_WKU: Wake-up Interrupt CAN_IT_SLK: Sleep acknowledge Interrupt CAN_IT_EWG: Error warning Interrupt CAN_IT_EPV: Error passive Interrupt CAN_IT_BOF: Bus-off Interrupt CAN_IT_LEC: Last error code Interrupt CAN_IT_ERR: Error Interrupt
NewState	new state of the CAN interrupts. This parameter can be: ENABLE or DISABLE.

Return values

None

Definition at line 1290 of file stm32f4xx_can.c.