AN1105 datasheet(68/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

result=CAN_transmit_queue.first_object->message;

CAN_transmit_queue.first_object->message=NULL;

//Updates queue

parameters

CAN_transmit_queue.first_object=CAN_transmit_queue.first_object-

>next_object;

CAN_transmit_queue.fifo_size=(CAN_transmit_queue.fifo_size)-1;

CAN_transmit_queue.isinuse=CFALSE;

//Releases the queue

return result;

}

/*--------------------------------------------------------------------------

ROUTINE NAME : CAN_Clean

INPUT/OUTPUT : -- /error status

DESCRIPTION : Cleans the recept. and emission buffers, and resets the transmis-

sion queue.

COMMENTS

: Must be called only in sleep mode (run bit reset)

Must not be interrupted

Only affects pointers

Called by CAN_Sleep and CAN_Kill

Possible return values : CAN_CLEAN_FAILURE

CAN_CLEAN_SUCCESS

CAN_CLEAN_FATAL

--------------------------------------------------------------------------*/

static CAN_Clean_Error CAN_Clean (void)

{

if (!ValBit(CANCSR,RUN))

//No cleaning while the CAN node is running

{

//Cleaning transmission queue

if (CAN_transmit_queue.isinuse)

{

return CAN_CLEAN_FATAL;

}

CAN_transmit_queue.isinuse=CTRUE;

//Locks the queue

CAN_transmit_queue.first_object=&CAN_queue_object_1;

//Reinit. the

queue

CAN_transmit_queue.last_object=&CAN_queue_object_3;

//(In the same

AN1105 Datasheet(PDF) 68 Page - STMicroelectronics

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