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14:31
<
DocScrutinizer05 >
need it for other raw data downloads, like :WAVeform:DATA?
14:32
<
DocScrutinizer05 >
which can return arbitrary number of bytes
14:32
<
DocScrutinizer05 >
(max 9999 per chink :-/ )
14:33
<
DocScrutinizer05 >
>> The data returned contains 2 parts: the TMC data description header and the waveform data. The format of the TMC data description header is #900000dddd which is followed by the waveform data. Wherein, dddd denotes the number of bytes of the effective waveform data. <<
14:35
<
DocScrutinizer05 >
seems when I want to download a 12MB buffer of wave data, I need to use a read loop that sets :WAVeform:STARt according to <number-of-bytes-already-read + 1>
14:40
<
DocScrutinizer05 >
sidenote: I failed to teach dd to read in ${numofbytes##*(0)}, got weird results
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<
DocScrutinizer05 >
another sidenote: storing waveform of a 12MB buffer to USB memstick in CSV format (results in ~130MB filesize) took 81 minutes on one memstick and 21 minutes on another more contemporary one (uSD adapter with 32GB uSD)
15:00
<
DocScrutinizer05 >
Rigol must use blocksize=1
15:00
<
DocScrutinizer05 >
and no fs buffers
15:17
<
wpwrak >
i suspect they may have a slow UART between CPU and the communication subsystem :)
17:01
<
DocScrutinizer05 >
ok, max size for a :WAVeform:DATA? chunk seems ~200kBytes
17:02
<
DocScrutinizer05 >
I.E send_cmd ':WAVeform:STAR 200001'; send_cmd ':WAVeform:STOP 400000';
17:02
<
DocScrutinizer05 >
jr@saturn:~> rigol-waveform ':WAVeform:DATA?' xxx-stop400000-start200001
17:02
<
DocScrutinizer05 >
magic: #; len: 9; bytes: 200000
17:03
<
DocScrutinizer05 >
300000 results in 0 length data chunk, due to empty "bytes: " TMC header value
17:04
<
DocScrutinizer05 >
-rw-r--r-- 1 jr users 200000 4. Feb 17:54 xxx-stop200000
17:04
<
DocScrutinizer05 >
-rw-r--r-- 1 jr users 200000 4. Feb 18:00 xxx-stop400000-start200001
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