On Fri, 9 Apr 2021 at 17:59, Guillermo Gancio <ganci...@gmail.com> wrote:
> Hi Jack,
>
> Excellent! yes, with that I can read all the data with casperfpfa
> 1024*8, and I can see a "proper" spectrum, but other issue appear
> (that I didn't notice before) while configuring the synthesizer with
>
> adc.init(samplingRate=800, numChannel=1)
>
> it takes more than 20 secs, and on the tcpborph3 log I see a lots of
> repeating msgs of:
>
> no length specified, defaulting to data 4:0
> bit checks: total register=2048 start_bits=32 copy_bits=32
> raw write: bytes-in-buffer=4 register offset (0x4:0) len(0x4:0)
>
> it ends up returning "0", is this behavior ok?
>
I'm going to tentatively say... yes. The casperfpga client should explode
(probably ungracefully) if anything with comms goes wrong. It's unlikely
(famous last words) that anything is quietly going bad inside
tcpborphserver without you knowing. I'd close the log so you don't worry
about it :)
Taking a while is reasonable -- there is an ADC/FPGA link training exercise
in initialization which requires repeatedly varying FPGA trace-compensation
delays and inspecting snapshots of ADC data. The whole thing requires quite
a lot of register reads / writes / and the interface is pretty slow.
The "no length specified" is probably fine -- sounds like if nothing else
is specified, the default read is a single 4-byte register, which seems
like reasonable behaviour.
>
> Thanks!
>
> El vie, 9 abr 2021 a las 12:45, Jack Hickish (<jackhick...@gmail.com>)
> escribió:
> >
> > Hi Guillermo,
> >
> > Interesting. So, if I understood your last few emails, you can read the
> whole bram fine if you do so one word at a time. But if you read 512 bytes
> or more things break.
> >
> > The answer is somewhere in bulk_read in spifpga_user.c, I think. But I
> wonder, if you change MAX_BURST_SIZE (which I think reflects numbers of
> 32-bit reads which are commanded at once from the SPI driver) to 64 (so a
> max read per burst of 256 bytes) does that help? I'm not sure the tutorials
> were ever tested with a pi rev 1 B+, so maybe there was always a problem
> with large reads which was never noticed(?)
> >
> > Cheers
> > Jack
> >
> >
> >
> >
> >
> > On Fri, 9 Apr 2021 at 16:09, Guillermo Gancio <ganci...@gmail.com>
> wrote:
> >>
> >> Hi Jack,
> >>
> >> I have been doing more tests, and I notice the following on the
> >> raspberry pi tcpborphserver3 Log....
> >>
> >> When I do Casperfpga -> fpga.read('even',512,0) on the Rpi tcpb3 log I
> got:
> >> data added is 522, needed at least 10 + 513
> >>
> >> Now if I do, fpga.read('even',1024*8,0), or any number of bytes larger
> >> than 512, on the Rpi tcpb3 log I got:
> >> can't send spi message! (error -1)
> >>
> >> Cheers,
> >>
> >>
> >> El mié, 7 abr 2021 a las 11:24, Jack Hickish (<jackhick...@gmail.com>)
> escribió:
> >> >
> >> >
> >> >
> >> > On Wed, 7 Apr 2021, 2:57 pm Guillermo Gancio, <ganci...@gmail.com>
> wrote:
> >> >>
> >> >> Hi,
> >> >>
> >> >> I'm using the tutorials from
> >> >>
> https://github.com/casper-astro/tutorials_devel/tree/master/snap/tut_spec
> >> >> I just clone them and I got the same result, could be an issue with
> >> >> the katcp installation on the snap-raspberry?
> >> >
> >> >
> >> > You're using the prebuilt FPG file? It could be katcp I suppose - if
> you read one word at a time, eg with CasperFpga.read_uint using an
> increasing word_offset argument, how far can you read?
> >> >
> >> >>
> >> >> I'm also checking the casperfpga installation...
> >> >>
> >> >> Cheers.
> >> >>
> >> >>
> >> >>
> >> >>
> >> >>
> >> >> El mié, 7 abr 2021 a las 10:15, Jack Hickish (<jackhick...@gmail.com>)
> escribió:
> >> >> >
> >> >> > Hi Guillermo,
> >> >> >
> >> >> > If the values are 64 bits in the model, it is suspicious that the
> reads are 1024*4 Bytes. I notice that in the latest tutorials_devel the
> reads are 1024*8 bytes (
> https://github.com/casper-astro/tutorials_devel/blob/2982f9f14bffa065a80d9047ec5cd7ea1ca3ad6c/snap/tut_spec/snap_tut_spec.py#L19
> )
> >> >> >
> >> >> > What version of the tutorial are you using -- it's possible that
> if the version is old something else is wrong.
> >> >> >
> >> >> > Cheers
> >> >> > Jack
> >> >> >
> >> >> > On Wed, 7 Apr 2021 at 14:09, Guillermo Gancio <ganci...@gmail.com>
> wrote:
> >> >> >>
> >> >> >> Hi Jack,
> >> >> >>
> >> >> >> What I understand from the tutorial, and correct me if I'm wrong,
> is:
> >> >> >> Size of PFB and FFT, 2^12 i.e Re+Im 4096 channels, that's 2048
> >> >> >> frequency channels after obtaining power values from the complex
> >> >> >> values.
> >> >> >> Those 2048 channels end up in two registers 'even' and 'odd' of
> 2^10
> >> >> >> i.e. 1024 values each, each of this values is of 64bits,
> >> >> >> So I have to read 1024 * 8 = 8192 bits, from each register (even
> and odd).
> >> >> >>
> >> >> >> I compiled the project with those values and I got the same
> result as
> >> >> >> before, (read ok with 128*4 bits, ,fpga.read('even',128*4,0) )
> >> >> >>
> >> >> >> Cheers
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >> El mar, 6 abr 2021 a las 11:27, Jack Hickish (<
> jackhick...@gmail.com>) escribió:
> >> >> >> >
> >> >> >> > Hi Guillermo,
> >> >> >> >
> >> >> >> > How many channels is that tutorial supposed to generate? It
> looks like the RAM is smaller than expected by the software. Is it possible
> that each even/odd RAM is supposed to be 512*4 (i.e., 512 words, each
> 32-bits wide) for 1024 channels total?
> >> >> >> >
> >> >> >> > Cheers
> >> >> >> > Jack
> >> >> >> >
> >> >> >> > On Mon, 5 Apr 2021 at 22:46, Guillermo Gancio <
> ganci...@gmail.com> wrote:
> >> >> >> >>
> >> >> >> >> Hi Casperities (?)
> >> >> >> >>
> >> >> >> >> I'm going thru the tutorial 3 on a snap board, and I have some
> >> >> >> >> issue/error while reading the 'odd' and 'even' register,
> >> >> >> >> when reading with
> >> >> >> >> -> a_0=struct.unpack('>1024l',fpga.read('even',1024*4,0))
> >> >> >> >>
> >> >> >> >> I end up with the error
> >> >> >> >> -> Request: ?read odd 0 4096
> >> >> >> >> -> Reply: !read fail
> >> >> >> >>
> >> >> >> >> but if I change the number of bytes to read from 1024*4 to
> 128*4, I
> >> >> >> >> can read it with no problem, ( but the data plot does not seem
> to be
> >> >> >> >> ok ). Also the accumulation value increments ok.
> >> >> >> >>
> >> >> >> >> Any thoughts? Thanks!
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >>
> >> >> >> >> --
> >> >> >> >> Instituto Argentino de Radioastronomia
> >> >> >> >> [Argentine Institute of Radioastronomy]
> >> >> >> >>
> >> >> >> >> Guillermo M. Gancio
> >> >> >> >> Responsable Área Observatorio
> >> >> >> >> [Head of Observatory]
> >> >> >> >>
> >> >> >> >> Tel: (0054-0221) 482-4903 Int: 106
> >> >> >> >> Mail laboral ggan...@iar.unlp.edu.ar
> >> >> >> >>
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> >> >> >>
> >> >> >> --
> >> >> >> Instituto Argentino de Radioastronomia
> >> >> >> [Argentine Institute of Radioastronomy]
> >> >> >>
> >> >> >> Guillermo M. Gancio
> >> >> >> Responsable Área Observatorio
> >> >> >> [Head of Observatory]
> >> >> >>
> >> >> >> Tel: (0054-0221) 482-4903 Int: 106
> >> >> >> Mail laboral ggan...@iar.unlp.edu.ar
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> >> >> Instituto Argentino de Radioastronomia
> >> >> [Argentine Institute of Radioastronomy]
> >> >>
> >> >> Guillermo M. Gancio
> >> >> Responsable Área Observatorio
> >> >> [Head of Observatory]
> >> >>
> >> >> Tel: (0054-0221) 482-4903 Int: 106
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> >> [Argentine Institute of Radioastronomy]
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> >> Responsable Área Observatorio
> >> [Head of Observatory]
> >>
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>
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