someone--else has quit [Ping timeout: 268 seconds]
<azonenberg>
Ok so i want to overhaul the signal generator feature of the demo scope
<azonenberg>
possibly refactoring some of this out of the demo and into a new instrument
<azonenberg>
basically i want to create a virtual AWG that lets you create all kinds of test waveforms
<azonenberg>
for filter testing, demonstration, and channel emulation tests
<azonenberg>
Among other things I want to be able to generate complex RF modulations, tones of arbitrary frequencies, multi-tone signals, PRBSes, random 8b10b and 64b66b coded data, and both NRZ and PAM4 waveforms
<azonenberg>
I think maybe a good way to do this is to have a relatively small number of basic primitives then have filter blocks that go the opposite of the normal decode ones
<azonenberg>
So for example we'd have a "NRZ" filter that converts a digital waveform to analog with specified low/high voltages, and maybe rise/fall times
<azonenberg>
or a PAM4 filter that, well, does PAM4
Degi_ has joined #scopehal
Degi has quit [Ping timeout: 240 seconds]
Degi_ is now known as Degi
<_whitenotifier-a>
[scopehal] azonenberg pushed 1 commit to master [+2/-0/±4] https://git.io/JnCKm
<_whitenotifier-a>
[scopehal-docs] azonenberg pushed 1 commit to master [+0/-0/±1] https://git.io/JnWOf
<_whitenotifier-a>
[scopehal-docs] azonenberg 8b20b4b - Initial skeleton documentation for digital-to-NRZ and sine filters
<_whitenotifier-a>
[scopehal-apps] azonenberg pushed 3 commits to master [+0/-0/±5] https://git.io/JnWOz
<_whitenotifier-a>
[scopehal-apps] azonenberg 5af09ce - FilterGraphEditorWidget: filters with no inputs are now drawn in column 0, with scope channels
<_whitenotifier-a>
[scopehal-apps] azonenberg eb63a43 - WaveformArea: filters with no inputs are considered scope channels and display sample rate and memory depth
<_whitenotifier-a>
[scopehal-apps] azonenberg 0d04c85 - WaveformArea: Filters with no inputs are always legal to create
<_whitenotifier-a>
[scopehal-apps] azonenberg opened issue #379: Improve signal generator filter UX - https://git.io/JnWOP
<azonenberg>
Hey, so the windows build is still broken
<azonenberg>
Does anyone have time to look at that? I cant remember who originally borked it but that should get fixed asap
<azonenberg>
And i don't have a windows box to test with
<monochroma>
do we have to support windows ? :<
<azonenberg>
Lol, i wish we didnt have to but users expect that these days :p
<azonenberg>
Anyway, so i'm doing a big overhaul of the signal generation capabilities
<monochroma>
i guess we will see after 11 ;)
<azonenberg>
The "fast edge" channel in the demo scope is going away as that really isnt a "demo" filter anyway
<azonenberg>
The other four i'll keep for UI testing and such
<azonenberg>
but libscopehal now supports filters that have zero inputs
<azonenberg>
which means they're effectively source nodes in the graph
<azonenberg>
so you can use the usual filter configuration dialog to configure parameters
<azonenberg>
right now the only one i have is a sine generator but i will be adding a lot more in the next few days
<azonenberg>
I also have a digital-to-NRZ and digital-to-PAM4 decode which convert digital signals to either NRZ or PAM4 with specified levels and rise/fall times
<azonenberg>
i will also be adding digital-to-PAM3 and digital-to-MLT3 filters soon
<azonenberg>
and some digital vector generators, like PRBS with configurable polynomial length
<azonenberg>
then some degradation filters like adding noise and jitter
<azonenberg>
the idea being that you can chain these, plus channel emulation and emphasis/equalization blocks, to create arbitrarily complex test waveforms
<azonenberg>
so for example PRBS31 at 10.3125 Gbps -> add 10ps of gaussian jitter -> convert to NRZ with -400 / +400 mV levels and 30ps rise/fall times -> add 20 mV of gaussian noise -> emulate a s-parameter channel
bvernoux has joined #scopehal
someone--else has joined #scopehal
someone--else has quit [Quit: Connection closed]
<d1b2>
<thirtythreeforty> This makes a whooole lot of sense when combined with instruments with a signal generator 🙂
<d1b2>
<thirtythreeforty> The one complication being that they typically have a limited AWG buffer... Any idea how that interaction would work?
<azonenberg>
So having a filter graph output to an AWG would be really cool
<azonenberg>
but thats a ways out from being supported
<azonenberg>
You'd probably just set the input signal memory depth to that buffer size
someone--else has joined #scopehal
<_whitenotifier-a>
[scopehal-docs] azonenberg pushed 1 commit to master [+0/-0/±1] https://git.io/JnlQQ
<_whitenotifier-a>
[scopehal-docs] azonenberg 0bc2a64 - Initial skeleton documentation of PRBS and noise filters
<_whitenotifier-a>
[scopehal] azonenberg pushed 2 commits to master [+4/-0/±6] https://git.io/JnlQb
<_whitenotifier-a>
[scopehal] azonenberg c206c74 - Initial implementation of PRBSGeneratorFilter
<_whitenotifier-a>
[scopehal] azonenberg 8a5742b - Initial implementation of NoiseFilter
<_whitenotifier-a>
[scopehal-apps] azonenberg pushed 1 commit to master [+0/-0/±2] https://git.io/JnlQN
<_whitenotifier-a>
[scopehal] azonenberg commented on issue #502: Windows/MINGW64 build is broken - https://git.io/Jn8Xp
<_whitenotifier-a>
[scopehal] azonenberg edited a comment on issue #502: Windows/MINGW64 build is broken - https://git.io/Jn8Xp
<_whitenotifier-a>
[scopehal] MegabytePhreak commented on issue #502: Windows/MINGW64 build is broken - https://git.io/Jn81i
someone--else has joined #scopehal
<_whitenotifier-a>
[scopehal] MegabytePhreak commented on issue #502: Windows/MINGW64 build is broken - https://git.io/Jn8QM
<_whitenotifier-a>
[scopehal] thirtythreeforty commented on issue #270: Support ultra cheap Logic Analyzer USB 2.0 HS with 24MHz 8 Chan based on Cypress FX2/FX2LP chips - https://git.io/Jn8Nw
<_whitenotifier-a>
[scopehal-apps] electroniceel commented on issue #376: std::bad_alloc exception when running the demo scope for some time - https://git.io/Jn8pw
<_whitenotifier-a>
[scopehal] electroniceel commented on issue #270: Support ultra cheap Logic Analyzer USB 2.0 HS with 24MHz 8 Chan based on Cypress FX2/FX2LP chips - https://git.io/Jn8hD
<_whitenotifier-a>
[scopehal] thirtythreeforty commented on issue #270: Support ultra cheap Logic Analyzer USB 2.0 HS with 24MHz 8 Chan based on Cypress FX2/FX2LP chips - https://git.io/Jn4ek