USER’S MANUAL__________________________________________________________________
404 _________________________________________________________________ M211322EN-D
D.3.3 Showing Coherent Processing
Intervals: -showCPIs
Coherent Processing Intervals (CPIs) are blocks of acquired pulses that
have been selected as the input data for the computation of each processed
ray. You can monitor how the timeseries data stream is being organized
into rays, by supplying the -showCPIs flag on the RVP8 startup command
line. Here ia sample printout (while running ascope):
CPI 0: 64–Pulses (269.74, 1.49) to (271.25, 1.49) 126.00–ms
TS: 1%
CPI 1: 64–Pulses (270.51, 1.49) to (272.02, 1.49) 126.00–ms
TS: 0%
CPI 2: 64–Pulses (271.28, 1.49) to (272.79, 1.49) 126.00–ms
TS: 0%
CPI 3: 64–Pulses (272.04, 1.49) to (273.56, 1.49) 126.00–ms
TS: 1%
The CPIs are numbered beginning with each new ProcSection, and the
number of pulses within each one is shown. The starting (AZ,EL) and
ending (AZ,EL) are then printed, along with the duration of the CPI in
milliseconds (ms). In the example, the PRF was 500 Hz, hence the 64
pulses span a total time of 126 ms. The "lateness" of the data being
extracted from the TimeSeries API is listed as a percentage of available
history depth.
If the lateness approaches 100%, that is evidence that the RVP8 is having
trouble keeping up with the CPU and/or memory throughput demanded by
the current major mode. The default algorithm for blocking CPIs keeps
track of whether it seems to be falling behind, and tries to gracefully skip
pulses in order to catch up. Custom CPI algorithms for intensive major
modes should be written with the same sort of feedback. See the code in
rvp8main/open/cpi.c for more details and suggestions.
D.3.4 Showing RealTime Callback Timers:
-showRTCtrl
The RVP8 can show the detailed activity of whatever callback timers have
been registered for the current major mode. If the -showRTCtrl flag is
supplied on the command line, then timer activity is printed during each
active ProcSection. These timer callbacks provide a simple, yet powerful
framework for developers to handle real-time events within the RVP8 (see
Section D.5 Real-Time Control of the RVP8 on page 405 and the
documentation for struct rtCtrlCBTimer).
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