CAN - Controller Area Network#

Controller Area Network API.

The Controller Area Network Interface Bus (CAN) implements a multi-master serial bus for connecting microcontrollers and devices, also known as nodes, to communicate with each other in applications without a host computer. CAN is a message-based protocol, designed originally for automotive applications, but also used in many other scenarios. The complexity of a node can range from a simple I/O device up to an embedded computer with a CAN interface and sophisticated software. The node may also be a gateway allowing a standard computer to communicate over a USB or Ethernet port to the devices on a CAN network. Devices are connected to the bus through a host processor, a CAN controller, and a CAN transceiver.

#include "em_can.h"
#include "em_cmu.h"
#include "em_gpio.h"

void CAN_sendExample(void)
{
  CMU_ClockEnable(cmuClock_HFPER, true);
  CMU_ClockEnable(cmuClock_CAN0, true);
  CMU_ClockEnable(cmuClock_GPIO, true);

  CAN_Reset(CAN_DEVICE);

  CAN_Mode_TypeDef mode = canModeInit;
  CAN_SetMode(CAN_DEVICE, mode);

  GPIO_PinModeSet($gpioPortX, $X_bit, gpioModeInput, 0);
  GPIO_PinModeSet($gpioPortY, $Y_bit, gpioModePushPull, 0);

  CAN_SetRoute(CAN_DEVICE, true, $x, $y);

  CAN_SetBitTiming(CAN_DEVICE, 100000, 1, 4, 4, 1);

  mode = canModeNormal;
  CAN_SetMode(CAN_DEVICE, mode);

  CAN_MessageObject_TypeDef message;
  message.msgNum = 1;
  message.extended = false;
  message.id = 19;
  message.dlc = 8;
  uint32_t i;
  for (i = 0; i < message.dlc; ++i) {
    message.data[i] = i;
  }

  CAN_ConfigureMessageObject(CAN_DEVICE, 0, message.msgNum, true, true, false, true);

  CAN_SendMessage(CAN_DEVICE, 0, &message, true);
}

Modules#

CAN_MessageObject_TypeDef

CAN_Init_TypeDef

Enumerations#

enum

CAN_ErrorCode_TypeDef {

canErrorNoError = CAN_STATUS_LEC_NONE

canErrorStuff = CAN_STATUS_LEC_STUFF

canErrorForm = CAN_STATUS_LEC_FORM

canErrorAck = CAN_STATUS_LEC_ACK

canErrorBit1 = CAN_STATUS_LEC_BIT1

canErrorBit0 = CAN_STATUS_LEC_BIT0

canErrorCrc = CAN_STATUS_LEC_CRC

canErrorUnused = CAN_STATUS_LEC_UNUSED

}

CAN Status codes.

enum

CAN_Mode_TypeDef {

canModeNormal

canModeBasic

canModeLoopBack

canModeSilentLoopBack

canModeSilent

}

CAN peripheral mode.

Functions#

void

CAN_Init(CAN_TypeDef *can, const CAN_Init_TypeDef *init)

Initialize CAN.

uint32_t

CAN_GetClockFrequency(CAN_TypeDef *can)

Get the CAN module frequency.

bool

CAN_MessageLost(CAN_TypeDef *can, uint8_t interface, uint8_t msgNum)

Read a Message Object to find if a message was lost ; reset the 'Message Lost' flag.

void

CAN_SetRoute(CAN_TypeDef *can, bool active, uint16_t pinRxLoc, uint16_t pinTxLoc)

Set the ROUTE registers.

void

CAN_SetBitTiming(CAN_TypeDef *can, uint32_t bitrate, uint16_t propagationTimeSegment, uint16_t phaseBufferSegment1, uint16_t phaseBufferSegment2, uint16_t synchronisationJumpWidth)

Set the bitrate and its parameters.

void

CAN_SetMode(CAN_TypeDef *can, CAN_Mode_TypeDef mode)

Set the CAN operation mode.

void

CAN_SetIdAndFilter(CAN_TypeDef *can, uint8_t interface, bool useMask, const CAN_MessageObject_TypeDef *message, bool wait)

Set the ID and the filter for a specific Message Object.

void

CAN_ConfigureMessageObject(CAN_TypeDef *can, uint8_t interface, uint8_t msgNum, bool valid, bool tx, bool remoteTransfer, bool endOfBuffer, bool wait)

Configure valid, TX/RX, remoteTransfer for a specific Message Object.

void

CAN_SendMessage(CAN_TypeDef *can, uint8_t interface, const CAN_MessageObject_TypeDef *message, bool wait)

Send data from the Message Object message.

bool

CAN_ReadMessage(CAN_TypeDef *can, uint8_t interface, CAN_MessageObject_TypeDef *message)

Read data and ID from a Message Object in RAM and store it in a message.

void

CAN_AbortSendMessage(CAN_TypeDef *can, uint8_t interface, uint8_t msgNum, bool wait)

Abort sending a message.

void

CAN_ResetMessages(CAN_TypeDef *can, uint8_t interface)

Reset all Message Objects and set their data to 0.

void

CAN_Reset(CAN_TypeDef *can)

Set all CAN registers to RESETVALUE.

void

CAN_WriteData(CAN_TypeDef *can, uint8_t interface, const CAN_MessageObject_TypeDef *message)

Write data from a message to the MIRx registers.

void

CAN_SendRequest(CAN_TypeDef *can, uint8_t interface, uint8_t msgNum, bool wait)

Send a request for writing or reading RAM of the Message Object msgNum.

void

CAN_Enable(CAN_TypeDef *can, bool enable)

Enable the Host Controller to send messages.

bool

CAN_IsEnabled(CAN_TypeDef *can)

Give the communication capabilities state.

void

CAN_ReadyWait(CAN_TypeDef *can, uint8_t interface)

Waiting function.

CAN_ErrorCode_TypeDef

CAN_GetLastErrorCode(CAN_TypeDef *can)

Get the last error code and clear its register.

uint32_t

CAN_HasNewdata(CAN_TypeDef *can)

Indicate which message objects have received new data.

void

CAN_StatusIntClear(CAN_TypeDef *can, uint32_t flags)

Clear one or more pending CAN status interrupts.

void

CAN_StatusIntDisable(CAN_TypeDef *can, uint32_t flags)

Disable CAN status interrupts.

void

CAN_StatusIntEnable(CAN_TypeDef *can, uint32_t flags)

Enable CAN status interrupts.

uint32_t

CAN_StatusIntGet(CAN_TypeDef *can)

Get pending CAN status interrupt flags.

uint32_t

CAN_StatusIntGetEnabled(CAN_TypeDef *can)

Get pending and enabled CAN status interrupt flags.

void

CAN_StatusIntSet(CAN_TypeDef *can, uint32_t flags)

Set one or more CAN status interrupts.

uint32_t

CAN_StatusGet(CAN_TypeDef *can)

Get CAN status.

void

CAN_StatusClear(CAN_TypeDef *can, uint32_t flags)

Clear CAN status.

uint32_t

CAN_GetErrorCount(CAN_TypeDef *can)

Get the error count.

void

CAN_MessageIntClear(CAN_TypeDef *can, uint32_t flags)

Clear one or more pending CAN message interrupts.

void

CAN_MessageIntDisable(CAN_TypeDef *can, uint32_t flags)

Disable CAN message interrupts.

void

CAN_MessageIntEnable(CAN_TypeDef *can, uint32_t flags)

Enable CAN message interrupts.

uint32_t

CAN_MessageIntGet(CAN_TypeDef *can)

Get pending CAN message interrupt flags.

uint32_t

CAN_MessageIntGetEnabled(CAN_TypeDef *can)

Get CAN message interrupt flags that are pending and enabled.

void

CAN_MessageIntSet(CAN_TypeDef *can, uint32_t flags)

Set one or more CAN message interrupts.

Macros#

#define

CAN_INIT_DEFAULT undefined

Default initialization of CAN_Init_TypeDef.

Enumeration Documentation#

CAN_ErrorCode_TypeDef#

CAN_ErrorCode_TypeDef

CAN Status codes.

Enumerator
canErrorNoError	No error occurred during the last CAN bus event.
canErrorStuff	More than 5 equal bits in a sequence have occurred in a part of a received message where this is not allowed.
canErrorForm	A fixed format part of a received frame has the wrong format.
canErrorAck	The message this CAN Core transmitted was not acknowledged by another node.
canErrorBit1	A wrong monitored bus value : dominant when the module wants to send a recessive.
canErrorBit0	A wrong monitored bus value : recessive when the module intends to send a dominant.
canErrorCrc	CRC check sum incorrect.
canErrorUnused	Unused.

CAN_Mode_TypeDef#

CAN_Mode_TypeDef

CAN peripheral mode.

Enumerator
canModeNormal	CAN peripheral in Normal mode : ready to send and receive messages.
canModeBasic	CAN peripheral in Basic mode : no use of the RAM.
canModeLoopBack	CAN peripheral in Loopback mode : input from the CAN bus is disregarded and comes from TX instead.
canModeSilentLoopBack	CAN peripheral in SilentLoopback mode : input from the CAN bus is disregarded and comes from TX instead ; no output on the CAN bus.
canModeSilent	CAN peripheral in Silent mode : no output on the CAN bus.

Function Documentation#

CAN_Init#

void CAN_Init (CAN_TypeDef * can, const CAN_Init_TypeDef * init)

Initialize CAN.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
const CAN_Init_TypeDef *	[in]	init	A pointer to the CAN initialization structure.

CAN_GetClockFrequency#

uint32_t CAN_GetClockFrequency (CAN_TypeDef * can)

Get the CAN module frequency.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

An internal prescaler of 2 is inside the CAN module.

Returns

A clock value.

CAN_MessageLost#

bool CAN_MessageLost (CAN_TypeDef * can, uint8_t interface, uint8_t msgNum)

Read a Message Object to find if a message was lost ; reset the 'Message Lost' flag.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.
uint8_t	[in]	msgNum	A message number of the Message Object, [1 - 32].

Returns

True if a message was lost, false otherwise.

CAN_SetRoute#

void CAN_SetRoute (CAN_TypeDef * can, bool active, uint16_t pinRxLoc, uint16_t pinTxLoc)

Set the ROUTE registers.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
bool	[in]	active	A boolean indicating whether or not to activate the ROUTE registers.
uint16_t	[in]	pinRxLoc	A location of the RX pin.
uint16_t	[in]	pinTxLoc	A location of the TX pin.

CAN_SetBitTiming#

void CAN_SetBitTiming (CAN_TypeDef * can, uint32_t bitrate, uint16_t propagationTimeSegment, uint16_t phaseBufferSegment1, uint16_t phaseBufferSegment2, uint16_t synchronisationJumpWidth)

Set the bitrate and its parameters.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	bitrate	A wanted bitrate on the CAN bus.
uint16_t	[in]	propagationTimeSegment	A value for the Propagation Time Segment.
uint16_t	[in]	phaseBufferSegment1	A value for the Phase Buffer Segment 1.
uint16_t	[in]	phaseBufferSegment2	A value for the Phase Buffer Segment 2.
uint16_t	[in]	synchronisationJumpWidth	A value for the Synchronization Jump Width.

Multiple parameters need to be properly configured. See the reference manual for a detailed description. Careful : the BRP (Baud Rate Prescaler) is calculated by: 'brp = freq / (period * bitrate);'. freq is the frequency of the CAN device, period the time of transmission of a bit. The result is an uint32_t. Hence it's truncated, causing an approximation error. This error is non negligible when the period is high, the bitrate is high, and frequency is low.

CAN_SetMode#

void CAN_SetMode (CAN_TypeDef * can, CAN_Mode_TypeDef mode)

Set the CAN operation mode.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
CAN_Mode_TypeDef	[in]	mode	Mode of operation : Init, Normal, Loopback, SilentLoopback, Silent, Basic.

In initialization mode, the CAN module is deactivated. Reset the messages in all other modes to be sure that there is no leftover data that needs to be configured before use.

CAN_SetIdAndFilter#

void CAN_SetIdAndFilter (CAN_TypeDef * can, uint8_t interface, bool useMask, const CAN_MessageObject_TypeDef * message, bool wait)

Set the ID and the filter for a specific Message Object.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.
bool	[in]	useMask	A boolean to choose whether or not to use the masks.
const CAN_MessageObject_TypeDef *	[in]	message	A Message Object.
bool	[in]	wait	If true, wait for the end of the transfer between the MIRx registers and the RAM to exit. If false, exit immediately, the transfer can still be in progress.

The initialization bit has to be 0 to use this function.

CAN_ConfigureMessageObject#

void CAN_ConfigureMessageObject (CAN_TypeDef * can, uint8_t interface, uint8_t msgNum, bool valid, bool tx, bool remoteTransfer, bool endOfBuffer, bool wait)

Configure valid, TX/RX, remoteTransfer for a specific Message Object.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.
uint8_t	[in]	msgNum	A message number of this Message Object, [1 - 32].
bool	[in]	valid	True if the Message Object is valid, false otherwise.
bool	[in]	tx	True if the Message Object is used for transmission, false if used for reception.
bool	[in]	remoteTransfer	True if the Message Object is used for remote transmission, false otherwise.
bool	[in]	endOfBuffer	True if it is for a single Message Object or the end of a FIFO buffer, false if the Message Object is part of a FIFO buffer and not the last.
bool	[in]	wait	If true, wait for the end of the transfer between the MIRx registers and the RAM to exit. If false, exit immediately, the transfer can still be in progress.

The initialization bit has to be 0 to use this function.

CAN_SendMessage#

void CAN_SendMessage (CAN_TypeDef * can, uint8_t interface, const CAN_MessageObject_TypeDef * message, bool wait)

Send data from the Message Object message.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.
const CAN_MessageObject_TypeDef *	[in]	message	A Message Object.
bool	[in]	wait	If true, wait for the end of the transfer between the MIRx registers and RAM to exit. If false, exit immediately. The transfer can still be in progress.

If the message is configured as TX and remoteTransfer = 0, calling this function will send the data of this Message Object if its parameters are correct. If the message is TX and remoteTransfer = 1, this function will set the data of message to RAM and exit. Data will be automatically sent after reception of a remote frame. If the message is RX and remoteTransfer = 1, this function will send a remote frame to the corresponding ID. If the message is RX and remoteTransfer = 0, the user shouldn't call this function. It will also send a remote frame.

CAN_ReadMessage#

bool CAN_ReadMessage (CAN_TypeDef * can, uint8_t interface, CAN_MessageObject_TypeDef * message)

Read data and ID from a Message Object in RAM and store it in a message.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.
CAN_MessageObject_TypeDef *	[in]	message	A Message Object.

Read the information from RAM on this Message Object. Data and the configuration of the Message Object is read. The information is only read if the message stored in the Message Object is new and valid.

Returns

True if the Message Object in RAM holds a new and valid message, which was not read earlier, false otherwise.

CAN_AbortSendMessage#

void CAN_AbortSendMessage (CAN_TypeDef * can, uint8_t interface, uint8_t msgNum, bool wait)

Abort sending a message.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.
uint8_t	[in]	msgNum	A message number of this Message Object, [1 - 32].
bool	[in]	wait	If true, wait for the end of the transfer between the MIRx registers and the RAM to exit. If false, exit immediately. The transfer can still be in progress.

Set the TXRQST of the CTRL register to 0. Doesn't touch data or the other parameters. The user can call CAN_SendMessage() to send the object after using CAN_AbortSendMessage().

CAN_ResetMessages#

void CAN_ResetMessages (CAN_TypeDef * can, uint8_t interface)

Reset all Message Objects and set their data to 0.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.

CAN_Reset#

void CAN_Reset (CAN_TypeDef * can)

Set all CAN registers to RESETVALUE.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Leave the CAN device disabled.

CAN_WriteData#

void CAN_WriteData (CAN_TypeDef * can, uint8_t interface, const CAN_MessageObject_TypeDef * message)

Write data from a message to the MIRx registers.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.
const CAN_MessageObject_TypeDef *	[in]	message	A Message Object.

CAN_SendRequest#

void CAN_SendRequest (CAN_TypeDef * can, uint8_t interface, uint8_t msgNum, bool wait)

Send a request for writing or reading RAM of the Message Object msgNum.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.
uint8_t	[in]	msgNum	A message number of the Message Object, [1 - 32].
bool	[in]	wait	If true, wait for the end of the transfer between the MIRx registers and the RAM to exit. If false, exit immediately. The transfer can still be in progress.

CAN_Enable#

void CAN_Enable (CAN_TypeDef * can, bool enable)

Enable the Host Controller to send messages.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
bool	[in]	enable	True to enable CAN device, false to disable it. If the CAN device is enabled, it goes to normal mode (the default working mode).

CAN_IsEnabled#

bool CAN_IsEnabled (CAN_TypeDef * can)

Give the communication capabilities state.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Returns

True if the Host Controller can send messages, false otherwise.

CAN_ReadyWait#

void CAN_ReadyWait (CAN_TypeDef * can, uint8_t interface)

Waiting function.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint8_t	[in]	interface	Indicate which Message Interface Register to use.

CAN_GetLastErrorCode#

CAN_ErrorCode_TypeDef CAN_GetLastErrorCode (CAN_TypeDef * can)

Get the last error code and clear its register.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	Pointer to CAN peripheral register block.

Returns

return Last error code.

CAN_HasNewdata#

uint32_t CAN_HasNewdata (CAN_TypeDef * can)

Indicate which message objects have received new data.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Returns

State of MESSAGEDATA register indicating which message objects have received new data.

CAN_StatusIntClear#

void CAN_StatusIntClear (CAN_TypeDef * can, uint32_t flags)

Clear one or more pending CAN status interrupts.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	Pending CAN status interrupt source(s) to clear.

CAN_StatusIntDisable#

void CAN_StatusIntDisable (CAN_TypeDef * can, uint32_t flags)

Disable CAN status interrupts.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	CAN status interrupt source(s) to disable.

CAN_StatusIntEnable#

void CAN_StatusIntEnable (CAN_TypeDef * can, uint32_t flags)

Enable CAN status interrupts.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	CAN status interrupt source(s) to enable.

CAN_StatusIntGet#

uint32_t CAN_StatusIntGet (CAN_TypeDef * can)

Get pending CAN status interrupt flags.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Note

This function does not clear event bits.

Returns

CAN interrupt source(s) pending.

CAN_StatusIntGetEnabled#

uint32_t CAN_StatusIntGetEnabled (CAN_TypeDef * can)

Get pending and enabled CAN status interrupt flags.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Note

This function does not clear event bits.

Returns

CAN interrupt source(s) pending and enabled.

CAN_StatusIntSet#

void CAN_StatusIntSet (CAN_TypeDef * can, uint32_t flags)

Set one or more CAN status interrupts.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	CAN status interrupt source(s) to set to pending.

CAN_StatusGet#

uint32_t CAN_StatusGet (CAN_TypeDef * can)

Get CAN status.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Returns

A value of CAN register STATUS.

CAN_StatusClear#

void CAN_StatusClear (CAN_TypeDef * can, uint32_t flags)

Clear CAN status.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	CAN status bits to clear.

CAN_GetErrorCount#

uint32_t CAN_GetErrorCount (CAN_TypeDef * can)

Get the error count.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Returns

Error count.

CAN_MessageIntClear#

void CAN_MessageIntClear (CAN_TypeDef * can, uint32_t flags)

Clear one or more pending CAN message interrupts.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	Pending CAN message interrupt source(s) to clear.

CAN_MessageIntDisable#

void CAN_MessageIntDisable (CAN_TypeDef * can, uint32_t flags)

Disable CAN message interrupts.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	CAN message interrupt source(s) to disable.

CAN_MessageIntEnable#

void CAN_MessageIntEnable (CAN_TypeDef * can, uint32_t flags)

Enable CAN message interrupts.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	CAN message interrupt source(s) to enable.

CAN_MessageIntGet#

uint32_t CAN_MessageIntGet (CAN_TypeDef * can)

Get pending CAN message interrupt flags.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Note

This function does not clear event bits.

Returns

CAN message interrupt source(s) pending.

CAN_MessageIntGetEnabled#

uint32_t CAN_MessageIntGetEnabled (CAN_TypeDef * can)

Get CAN message interrupt flags that are pending and enabled.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.

Note

This function does not clear event bits.

Returns

CAN message interrupt source(s) pending and enabled.

CAN_MessageIntSet#

void CAN_MessageIntSet (CAN_TypeDef * can, uint32_t flags)

Set one or more CAN message interrupts.

Parameters

Type	Direction	Argument Name	Description
CAN_TypeDef *	[in]	can	A pointer to the CAN peripheral register block.
uint32_t	[in]	flags	CAN message interrupt source(s) to set as pending.