UM0459 datasheet(22/29 Pages) STMICROELECTRONICS

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Controller area network (CAN) routines

UM0459

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2.2.17

CAN_BasicSendMessage function

Example:

This example illustrates how to send frames.

{

/*Send consecutive data frames using message object 0*/

for (i = 0; i < 10; i++)

{

CAN_SendMessage(CAN1, CanMsgTable[i]);

CAN_WaitEndOfTx();

}

Table 21.

CAN_BasicSendMessage function description

Function name

CAN_BasicSendMessage

Prototype

ErrorStatus CAN_BasicSendMessage(CAN_TypeDef* CAN, canmsg*

pCanMsg);

Behavior description

Starts transmission of a message in BASIC mode.

This function performs the following operations:

– Tests if the IF0 is free.

– Writes the Arbitration, Message Control, DataA and DataB registers

of message interface 0, with the message contents.

– Writes the 1+msgobj value to the Command Request register to start

the transmission

This mode does not use the message RAM.

Input parameter 1

CAN: pointer to a CAN1 or CAN2 CAN_TypeDef structure.

Input parameter 2

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: Transmission started OK

– ERROR: No transmission

Required preconditions

The CAN must have been switched into BASIC mode.

Called functions

None

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