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with RI78V4
Coding
SERVICE CALLS
Synchronization and Communication Functions (Mailboxes)
prcv_mbx

prcv_mbx

Outline

Receive from mailbox (polling).

C format


ER prcv_mbx ( ID mbxid, T_MSG **ppk_msg );

Assembly format


MOVW BC, #LOWW(_ppk_msg) MOV A, #mbxid CALL !!_prcv_mbx

Parameter(s)


I/O	Parameter	Description
I	ID mbxid;	ID number of the mailbox from which a message is received.
O	T_MSG **ppk_msg;	Start address of the message packet received from the mailbox.

Explanation

This service call receives a message from the mailbox specified by parameter mbxid, and stores its start address in the area specified by parameter ppk_msg.

If the message could not be received from the target mailbox (no messages were queued in the wait queue) when this service call is issued, message reception processing is not executed but "E_TMOUT" is returned.

Note For details about the message packet, refer to "12.5.5 Message packet".

Return value


Macro	Value	Description
E_OK	0	Normal completion.
E_TMOUT	-50	Polling failure.