Command Example
Write
(WRIT)
Example: WRIT|<data>, where <data> is some binary data.
This data is written to RVP900. The data size should be even.
Read Status
(STAT)
Example: STAT| reads the status bits back from the RVP900. This is a 1 bit value,
set to 1 if the RVP900 has data available in its output buer.
It returns Ack|0, Ack|1, or Nak.
This is equivalent to the dspr_status() call in the dsp library.
Set Information
(INFO)
Example: INFO|
ByteOrder=LittleEndian,WillCompress=1,Version=7.32.
This command can be used to inform RVP902 DspExport about the host
computer. Available options are:
• ByteOrder—Informs DspExport of the byte order of the host computer.
This is needed because all the data read or written to/from the RVP900 is in
16-bit words. If the host computer has a dierent byte order from the RVP900,
DspExport byte swaps the data.
• WillCompress—Informs DspExport to use compression or not.
Compression is only used if both sides agree to use it. The host computer
should only set this to 1 if it received a CanCompress of 1 on initial connection.
The data from normal READ commands is compressed.
If the data is compressed, it replies with the acknowledge compressed string of
AkC.
The compression program is the zlib compress and uncompress. The
uncompress function requires that the caller know the expected uncompressed
size. This is true for RVP900 reads, because the reader always
specifies the
read size.
• Version—Sends the IRIS version.
Read Data Available
(RDAV)
Example: RDAV|100|2| means read up to 100 bytes of data from the RVP902 in
individual DMA transfers of 2 bytes each.
Before each read, the status is checked to see if there is more data available. If
not, the read stops, and the number of bytes read is returned. This is merely a
performance enhancing command, since the same feature is available by using
the READand STAT commands.
Open the Connection for I
and O
(OPEN)
Example: OPEN means switch from open for "info only" mode to open for I/O.
If the signal processor is in use by another device, you get an error in response to
this command. Multiple clients are allowed to connect for info only, but only one
can do I/O. If you run DspExport with the -803 command line option, you get
the legacy behavior, which means that every connection automatically sends the
OPEN command.
There is no reverse command to switch back to open for info only. There is also no
such library call in the driver.
Read Zcal Information
(RCAL)
Example: ZCAL means read the dsp_refl_cal structure from RVP900 and
send it back in an ASCII name=value pair format.
This is the structure configured by Zauto and Zcal.
The
configuration is served to all clients using RVP900.
Reset Kernel FIFOs
(RKFF)
Example: RKFF|2| means reset the kernel FIFOs on the RVP900.
The argument specifies which direction FIFOs to reset.
Chapter 3 – Functional Description
39
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