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Chapter 3 Introduction to MR308
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3.5.15 System Configuration Management Function
This function inspects the version information of MR308.
• References Version Information(ref_ver, iref_ver)
The ref_ver service call permits the user to get the version information of MR308. This version infor-
mation can be obtained in the standardized format of µITRON specification.
3.5.16 Extended Function (Short Data Queue)
The short data queue is a function outside the scope of µITRON 4.0 Specification. The data queue function
handles data as consisting of 32 bits, whereas the short data queue handles data as consisting of 16 bits. Both
behave the same way except only that the data sizes they handle are different.
• Send to Short Data Queue (vsnd_dtq, vtsnd_dtq)
Transmits data. Namely, data is transmitted to the short data queue. If the short data queue is full of
data, the task goes to a data transmission wait state.
• Send to Short Data Queue (vpsnd_dtq, vipsnd_dtq)
Transmits data. Namely, data is transmitted to the short data queue. If the short data queue is full of
data, the task returns error code without going to a data transmission wait state.
• Forced Send to Short Data Queue (vfsnd_dtq, vifsnd_dtq)
Transmits data. Namely, data is transmitted to the data queue. If the data queue is full of data, the
data at the top of the data queue or the oldest data is removed, and the transmitted data is stored at
the tail of the data queue.
• Receive from Short Data Queue(vrcv_dtq, vtrcv_dtq)
Receives data. Namely, data is retrieved from the short data queue. If the short data queue has no
data in it, the task is kept waiting until data is transmitted to the short data queue.
• Receive from Short Data Queue (vprcv_dtq, viprcv_dtq)
Receives data. Namely, data is received from the short data queue. If the short data queue has no
data in it, the task returns error code without going to a data reception wait state.
• Reference Short Data Queue Status (vref_dtq, viref_dtq)
Checks to see if there are any tasks waiting for data to be entered in the target short data queue and
refers to the number of the data in the data queue.