Replies: 6 comments 8 replies
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Hasak sends its settings as they're modified, so it produces a complete
inventory when it powers up and sets the initial defaults. Those may come
so fast that they trample each other.
It will also produce a throttled roll call any time it receives NRPN 2003.
As soon as I can get the quotation marks right, there will be hasak.json to
go with every released hasak.ino listing all the NRPNs and their details.
…-- 73 -- rec -- ad5dz --
On Sat, Feb 12, 2022 at 2:31 AM ahopper ***@***.***> wrote:
To create a ui able to set all possible settings you really need access to
the state of all controls, not just the ones that have changed since
connection.
This could just be a single message to trigger a send of all values or
some way to request each in turn.
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"Hasak sends its settings as they're modified, so it produces a complete The problem is, that the Teensy powers up as soon as the computer is switched on, and any "client" listening to those messages is started much later (after the computer boot is completed). So everything sent from the Teensy upon power-up is easily lost. |
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That sounds perfect, being able to demand them is good as the sdr sw is probably not running when the keyer starts up. |
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I guess I'm unclear, you want the descriptor JSON, or you want a JSON formatted dump of the current settings. I could compile the JSON descriptor file into character array in the firmware and then spool it out to you over MIDI. Then you wouldn't need to figure out what version you were talking to, it would describe itself. |
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Yes I meant the json descriptor. This would then allow anyone to add features and the ui would keep up without having to coordinate version numbers and locations of files. |
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That may be a problem for some people, but I just unplug the Teensy from
USB and plug it back in. It starts, it enumerates its settings, it's
done. But I haven't needed it recently.
…On Mon, Feb 14, 2022 at 9:50 AM dl1ycf ***@***.***> wrote:
"Hasak sends its settings as they're modified, so it produces a complete
inventory when it powers up and sets the initial defaults."
The problem is, that the Teensy powers up as soon as the computer is
switched on, and any "client" listening to those messages is started much
later (after the computer boot is completed). So everything sent from the
Teensy upon power-up is easily lost.
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Windows:
* I have a good json class in a single header (from Github) should anyone need it.
* As we’re talking CW latency in the RX chain is important. I’ve just implemented Partitioned FFT Convolution (IF filtering) which has a latency of 4ms irrespective of filter size. Will give links etc. should anyone be interested.
Simon Brown, G4ELI
<https://www.sdr-radio.com/> https://www.sdr-radio.com
From: ahopper ***@***.***>
Sent: 15 February 2022 07:22
To: softerhardware/CWKeyer ***@***.***>
Cc: Subscribed ***@***.***>
Subject: Re: [softerhardware/CWKeyer] Reading all control state (Discussion #11)
Yes I meant the json descriptor. This would then allow anyone to add features and the ui would keep up without having to coordinate version numbers and locations of files.
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No this is a misunderstanding. Latency in the RX chain is of no concern when it comes to keying, this is all TX. |
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If you're using a SDR for CW (or SSB for that matter) you don't want unnecessary RX latency as someone else can jump in before you in reply to a CQ. Ideally every area should have the lowest latency possible. Using 'Partitioned FFT Convolution' in the RX is a good way of reducing delay in the RX filtering. When you're in a QSK QSO at 50wpm then latency counts. FWIW the IC-7300 latency is excellent. |
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While this is all true, it has nothing to do with keying. What counts here is that the side tone is synchronous with the internal state of the keyer. BTW in Linux and (a little bit less so) in MacOS, a large part of the RX latency results from what happens with the RX audio samples after the filtering, when they are "sent" to ALSA, pulseaudio, portaudio or whatever audio subsystem in use. Here we are talking about 50 msec or so in bad cases. |
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On Windows (and I believe Linux) you can bypass the mixer and talk direct to the audio device driver, bringing latency down to sub-10ms. |
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So is there an experiment with a two-channel oscilloscope showing the RF input and the headphone output in two traces? In my experience the question is not how low you can go in terms of audio latency, but how low you want to go, to be on the safe side avoiding audio crackles if, e.g. a HPSDR packet from the radio arrives somewhat late. |
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Hi, not sure how this message ended up in this thread, using the github interface is recommended. |
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Okay, that makes excellent sense to me.
The discussion "Expanded NRPN common core #23" includes a NRPN_ID_JSON
nrpn, please chime in. And help me find any bugs in the NRPN_STRING*
proposal.
…On Tue, Feb 15, 2022 at 2:22 AM ahopper ***@***.***> wrote:
Yes I meant the json descriptor. This would then allow anyone to add
features and the ui would keep up without having to coordinate version
numbers and locations of files.
—
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To create a ui able to set all possible settings you really need access to the state of all controls, not just the ones that have changed since connection.
This could just be a single message to trigger a send of all values or some way to request each in turn.
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