S. W. This is cool! I was looking at the USB TMC class: https://www.
tmatlantic.com/…919
(https://www.tmatlantic.com/encyclopedia/index.php?ELEMENT_ID=13919)
In theory it should be much faster than CDC class because it uses BULK
transfers insread of CONTROL transfers. Bulk transfers can have multiple
packets in the frame,
so threoretically it should use most of the USB 2.0 FS bandwith, which is 12
Mbit/s.
https://www.keil.com/…tml
(https://www.keil.com/pack/doc/mw/USB/html/_u_s_b__bulk__transfers.html)
https://www.beyondlogic.org/…tml
(https://www.beyondlogic.org/usbnutshell/usb1.shtml)
Markb139 used timers, which isnt bad, but I thing that using the PIO + DMA
combo is better because you are not depending as much on the CPU and the PIO
frequency is easily set.
I would like to remove buffering entirely, and use DMA to directly send data
to TinyUSB, (microphone example is using exactly that, and I think it can
work for the USB TMC class too), maybe use another PIO for compression of
some sort, leaving the CPU almost free.
tabbey01 I am more into hardware than programming xd. The reason my driver
is complex is because it pack readed bits dynamically. With my tests, I got
someting more than 1Mbit/s so if you choose to
sample in 1MHz it will sample only one channel. This have the advantage that
you can choose if you want more pins with smaller sample speed or less on
higher frequency. Its pretty effitient with using the USB bandwidth.
The pico is really powerful for its price and it would be really nice to
have an universal driver in sigrok (the SUMP is really bad, because you cant
stream the samples, it will show them in the reverse order). I think it can
be also a really good programmer/impedance measurement/oscilloscope/gpio
tool.
> sorry for english :)
A.T.
---------- Původní e-mail ----------
Od: Shawn Walker <ac0b...@gmail.com>
Komu: Tony Abbey <tabbe...@gmail.com>
Datum: 17. 3. 2022 14:57:19
Předmět: Re: [sigrok-devel] New sigrok driver for homemade logic analyzer
"
Looks like we've got a party :)
A.T. It looks like you have all the basic elements of a driver, and use dma
buffering which is cool.
I submitted this pull request https://github.com/sigrokproject/libsigrok/
pull/181(https://github.com/sigrokproject/libsigrok/pull/181) for my
version.
I added 3 analog channels and up to 21 logic channels as well as SW
triggering and run length encoding.
There is also https://github.com/markb139/pico_logic
(https://github.com/markb139/pico_logic) with driver https://github.com/
markb139/libsigrok(https://github.com/markb139/libsigrok). markb139's
implementation is interesting because it uses a real USB TMC implementation
rather than serial CDC (I'm really interested to know if that provides
noticeable bandwidth improvements). At this point markb139 hasn't submitted
an official pull request, waiting at least in part to figure out USB ID
issues.
Note: I'm not a moderator/curator or approver for the sigrok repos, and I
have not had any contact from the developer as to which of any (or a merge
or ???) might be pulled into the official sigrok repo.
Shawn
On Thu, Mar 17, 2022 at 3:04 AM Tony Abbey <tabbe...@gmail.com
(mailto:tabbe...@gmail.com)> wrote:
"
Your code for the Pico looks interesting. I'm not sure how your proposed
patching of sigrok will work. It's all getting a bit complex for me as an
engineer rather than a programmer!
Tony
On Tue, 15 Mar 2022, 08:48 , <arnyt...@seznam.cz(mailto:arnyt...@seznam.cz)>
wrote:
"
Hello.
I am student from Czech Republic and I am graduating this year.
For my graduation project, I choose to create logic analyzer with rp
2040 and your amazing open source program Sigrok.
I have the code in working state and had an idea, if would be
possible to contribute it, becase the compiling is not the easiest
thing if others want to make it too.
Patech are sent as attachments to this mail. The code is not ideal,
i think its not even with the guidelines ":) so I wont be sad if you
wont add it.
I want to say big thank you for the program you developing, open
source communities are amazing :D.
project repo: https://github.com/…ool
(https://github.com/arnytrty/iotool)
Sincerently
A.T.
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