UM0459 datasheet(20/29 Pages) STMICROELECTRONICS

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Controller area network (CAN) routines

UM0459

20/29

Example:

This example illustrates how to send a standard ID data frame containing 4 data bytes.

{

canmsg CanMsg = { CAN_STD_ID, 0x111, 4, {0x10, 0x20, 0x40, 0x80} };

/*CAN1 Sends a standard ID data frame containing 4 data values*/

CAN_SendMessage(CAN1, 0, &CanMsg);

}

2.2.14

CAN_UpdateMsgObj function

2.2.15

CAN_TransmitRequest function

Table 18.

CAN_UpdateMsgObj function description

Function name

CAN_UpdateMsgObj

Prototype

ErrorStatus CAN_SendMessage(CAN_TypeDef* CAN, u16 msgobj,

canmsg* pCanMsg);

Behavior description

Updates the CAN message object with pCanMsg fields.

Input parameter 1

CAN: Pointer to a CAN1 or CAN2 CAN_TypeDef structure.

Input parameter 2

msgobj: message object number, from 0 to 31.

Input parameter 3

pCanMsg: Pointer to the canmsg structure that contains the data to

transmit: ID type, ID value, data length, data values.

Output parameter

None

Return value

An ErrorStatus enumeration value:

– SUCCESS: IF found to treat the message and the pCanMsg id

corresponds to the message idType configuration

– ERROR: IF not found to treat the message or if the pCanMsg id does not

correspond to the message idType configuration

Required preconditions

The message object must have been set up properly.

Called functions

CAN_GetFreeIF

Table 19.

CAN_TransmitRequest function description

Function name

CAN_TransmitRequest

Prototype

ErrorStatus CAN_TransmitRequest(CAN_TypeDef* CAN, u16 msgobj);

Behavior description

Starts the transmission of a message object. A data frame is transmitted if

the message object is configured in transmission mode. A remote frame is

transmitted if the message object is configured in reception mode.

Input parameter 1

CAN: Pointer to a CAN1 or CAN2 CAN_TypeDef structure.

Input parameter 2

msgobj: message object number, from 0 to 31.

Output parameter

None

Return value

An ErrorStatus enumeration value:

– SUCCESS: IF found to treat the message

– ERROR: IF not found to treat the message

Required preconditions The message object must have been set up properly.

Called functions

CAN_GetFreeIF

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