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 (<[email protected]>) escribió:
>
>
>
> On Wed, 7 Apr 2021, 2:57 pm Guillermo Gancio, <[email protected]> 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 (<[email protected]>)
>> 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 <[email protected]> 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 (<[email protected]>)
>> >> 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 <[email protected]>
>> >> > 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 [email protected]
>> >> >>
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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 [email protected]
>> >>
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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 [email protected]
>>
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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 [email protected]
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