UM0459 datasheet(23/29 Pages) STMICROELECTRONICS

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UM0459

Controller area network (CAN) routines

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2.2.18

CAN_BasicReceiveMessage function

Example:

This example illustrates how to receive frame in basic mode.

{

canmsg CanMsg;

/*Receive a message in BASIC mode*/

if (CAN_BasicReceiveMessage(CAN1, &CanMsg))

{

/* Check or copy the message contents*/

}

else

{

/* Error handling*/

}

Table 22.

CAN_BasicReceiveMessage function description

Function name

CAN_BasicReceiveMessage

Prototype

ErrorStatus CAN_BasicReceiveMessage(CAN_TypeDef*CAN,

canmsg* pCanMsg);

Behavior description

Gets the message in BASIC mode, if received.

This function performs the following operations:

– Tests the NewDat bit in the Message Control register of message

interface 1.

– Clears the RxOk bit in the Status register.

– Copies the message contents from the message interface 1 registers

to the structure.

This mode does not use the message RAM.

Input parameter 1

CAN: pointer to a CAN_TypeDef structure

Input parameter 2

pCanMsg: pointer to the canmsg structure where the received message

is copied.

Output parameter

None

Return value

An ErrorStatus enumeration value:

– SUCCESS: Reception OK

– ERROR: No message pending

Required preconditions

The CAN must have been switched into BASIC mode.

Called functions

None

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