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SERVICE CALLS
Synchronization and Communication Functions (Data Queues)
ref_dtq

ref_dtq

Outline

Reference data queue state.

C format

Assembly format


MOVW BC, #LOWW(_pk_rdtq) MOV A, #dtqid CALL !!_ref_dtq

Parameter(s)


I/O	Parameter	Description
I	ID dtqid;	ID number of the data queue to be referenced.
O	T_RDTQ *pk_rdtq;	Pointer to the packet returning the data queue state.

[Data queue state packet: T_RDTQ]

typedef struct t_rdtq { ID stskid; /Existence of tasks waiting for data transmission/ ID rtskid; /Existence of tasks waiting for data reception/ UINT sdtqcnt; /Number of data elements in data queue/ } T_RDTQ;

 typedef struct  t_rdtq {

     ID      stskid;         /*Existence of tasks waiting for data transmission*/

     ID      rtskid;         /*Existence of tasks waiting for data reception*/

     UINT    sdtqcnt;        /*Number of data elements in data queue*/

 } T_RDTQ;

Explanation

These service calls store the detailed information of the data queue (existence of waiting tasks, number of data elements in the data queue, etc.) specified by parameter dtqid into the area specified by parameter pk_rdtq.

Note For details about the data queue state packet, refer to "12.5.4 Data queue state packet".

Return value


Macro	Value	Description
E_OK	0	Normal completion.