AN1105 datasheet(67/100 Pages) STMICROELECTRONICS

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ST7 pCAN PERIPHERAL DRIVER

}

else

{

//If not, goes on processing

CAN_transmit_queue.last_object=(CAN_transmit_queue.last_object-

>next_object);

CAN_transmit_queue.last_object->message=msg_to_queue;

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

CAN_transmit_queue.isinuse=CFALSE;

return CAN_TRANSMIT_SUCCESS;

//Releases the queue

}

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

ROUTINE NAME : CAN_Out_Queue

INPUT/OUTPUT : -- /pointer on a CAN buffer

DESCRIPTION : Returns a pointer on the first message in the transmission queue.

Update the queue parameters

COMMENTS

: Called by CAN_TransmitRequest

Must not be interrupted

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

static CAN_Buffer* CAN_Out_Queue (void)

{

CAN_Buffer* result;

if (CAN_transmit_queue.isinuse) //Necessary to avoid multiple simultaneous

access

{

//to the datas

return CAN_TRANSMIT_FATAL;

//CAN_TRANSMIT_FATAL=0, that’s why the compiler

authorises such a return value (<=>NULL)

}

CAN_transmit_queue.isinuse=CTRUE;

//Locks the queue

if ((CAN_transmit_queue.fifo_size)==0) //If the queue is empty

{

CAN_transmit_queue.isinuse=CFALSE;

//Releases it

return NULL;

}

else

{

//Else goes on processing

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