On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
<ethan.jonhson05234@gmail.com> wrote:

>test

OK

On 2023-12-05, John Larkin wrote:
> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
><ethan.jonhson05234@gmail.com> wrote:
>
>>test
>
> OK

John,
They might need something a little clearer -- perhaps this:

"Test Successfully Failed. Message wasn't sent to a -test group."

(and perhaps guidance in picking a better news client)

--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860

On Tue, 5 Dec 2023 16:50:52 -0000 (UTC), Dan Purgert <dan@djph.net>
wrote:

>On 2023-12-05, John Larkin wrote:
>> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
>><ethan.jonhson05234@gmail.com> wrote:
>>
>>>test
>>
>> OK
>
>John,
>They might need something a little clearer -- perhaps this:
>
> "Test Successfully Failed. Message wasn't sent to a -test group."
>
>(and perhaps guidance in picking a better news client)

Maybe EJ wants to discuss electronics. In that case, welcome.

I was just thinking about (and spicing) DDS lowpass filters. With
enough DAC bits and a really fast clock, you barely need one.

On 2023-12-06, John Larkin wrote:
> On Tue, 5 Dec 2023 16:50:52 -0000 (UTC), Dan Purgert <dan@djph.net>
> wrote:
>
>>On 2023-12-05, John Larkin wrote:
>>> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
>>><ethan.jonhson05234@gmail.com> wrote:
>>>
>>>>test
>>>
>>> OK
>>
>>John,
>>They might need something a little clearer -- perhaps this:
>>
>> "Test Successfully Failed. Message wasn't sent to a -test group."
>>
>>(and perhaps guidance in picking a better news client)
>
> Maybe EJ wants to discuss electronics. In that case, welcome.

Hope so, it'll be a nice change from the OT posts (of which I'm guilty
of making too :| )

>
> I was just thinking about (and spicing) DDS lowpass filters. With
> enough DAC bits and a really fast clock, you barely need one.
>

Spice is one of those things I ought to learn at some point.

For now, I'm safely separated from most analog (RC lowpass filters on
inputs are about the extent of it) while I work through wrapping my head
around the new (to me) 0-series AVR chips and write up some drivers for
the onboard peripherals.

--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860

On Wed, 6 Dec 2023 12:23:51 -0000 (UTC), Dan Purgert <dan@djph.net>
wrote:

>On 2023-12-06, John Larkin wrote:
>> On Tue, 5 Dec 2023 16:50:52 -0000 (UTC), Dan Purgert <dan@djph.net>
>> wrote:
>>
>>>On 2023-12-05, John Larkin wrote:
>>>> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
>>>><ethan.jonhson05234@gmail.com> wrote:
>>>>
>>>>>test
>>>>
>>>> OK
>>>
>>>John,
>>>They might need something a little clearer -- perhaps this:
>>>
>>> "Test Successfully Failed. Message wasn't sent to a -test group."
>>>
>>>(and perhaps guidance in picking a better news client)
>>
>> Maybe EJ wants to discuss electronics. In that case, welcome.
>
>Hope so, it'll be a nice change from the OT posts (of which I'm guilty
>of making too :| )
>
>>
>> I was just thinking about (and spicing) DDS lowpass filters. With
>> enough DAC bits and a really fast clock, you barely need one.
>>
>
>Spice is one of those things I ought to learn at some point.

LT Spice is easy to learn and use. It has some logic elements too, so
you can make mixed-type circuits, like delta-sigma modulators or DDS
filters and even real logic systems, admittedly simple ones. Things
like pseudo-random shift registers for example.

It is cool to do FFT spectral analysis and such on digital circuits.

It's useful for leaving behind documentation, design notes, too. IF
one bothers to properly label things, which hardly anyone does.

>
>For now, I'm safely separated from most analog (RC lowpass filters on
>inputs are about the extent of it) while I work through wrapping my head
>around the new (to me) 0-series AVR chips and write up some drivers for
>the onboard peripherals.

I'm lobbying for our next-gen small uP to be RP2040. Digikey has 25K
in stock for 70 cents at any quantity.

On 2023-12-06 12:08, John Larkin wrote:
> On Wed, 6 Dec 2023 12:23:51 -0000 (UTC), Dan Purgert <dan@djph.net>
> wrote:
>
>> On 2023-12-06, John Larkin wrote:
>>> On Tue, 5 Dec 2023 16:50:52 -0000 (UTC), Dan Purgert <dan@djph.net>
>>> wrote:
>>>
>>>> On 2023-12-05, John Larkin wrote:
>>>>> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
>>>>> <ethan.jonhson05234@gmail.com> wrote:
>>>>>
>>>>>> test
>>>>>
>>>>> OK
>>>>
>>>> John,
>>>> They might need something a little clearer -- perhaps this:
>>>>
>>>> "Test Successfully Failed. Message wasn't sent to a -test group."
>>>>
>>>> (and perhaps guidance in picking a better news client)
>>>
>>> Maybe EJ wants to discuss electronics. In that case, welcome.
>>
>> Hope so, it'll be a nice change from the OT posts (of which I'm guilty
>> of making too :| )
>>
>>>
>>> I was just thinking about (and spicing) DDS lowpass filters. With
>>> enough DAC bits and a really fast clock, you barely need one.
>>>
>>
>> Spice is one of those things I ought to learn at some point.
>
> LT Spice is easy to learn and use. It has some logic elements too, so
> you can make mixed-type circuits, like delta-sigma modulators or DDS
> filters and even real logic systems, admittedly simple ones. Things
> like pseudo-random shift registers for example.
>
> It is cool to do FFT spectral analysis and such on digital circuits.
>
> It's useful for leaving behind documentation, design notes, too. IF
> one bothers to properly label things, which hardly anyone does.
>
>>
>> For now, I'm safely separated from most analog (RC lowpass filters on
>> inputs are about the extent of it) while I work through wrapping my head
>> around the new (to me) 0-series AVR chips and write up some drivers for
>> the onboard peripherals.
>
> I'm lobbying for our next-gen small uP to be RP2040. Digikey has 25K
> in stock for 70 cents at any quantity.
>
We're thinking along the same lines.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

On 2023-12-06, John Larkin wrote:
> On Wed, 6 Dec 2023 12:23:51 -0000 (UTC), Dan Purgert <dan@djph.net>
>>
>>Spice is one of those things I ought to learn at some point.
>
> LT Spice is easy to learn and use. It has some logic elements too, so
> you can make mixed-type circuits, like delta-sigma modulators or DDS
> filters and even real logic systems, admittedly simple ones. Things
> like pseudo-random shift registers for example. [...]

Yeah, I've heard it's not that bad -- just "time" and "attention span"
come into play. (As well as "all the other stuff one has to do around
the house, etc.)

>>
>>For now, I'm safely separated from most analog (RC lowpass filters on
>>inputs are about the extent of it) while I work through wrapping my head
>>around the new (to me) 0-series AVR chips and write up some drivers for
>>the onboard peripherals.
>
> I'm lobbying for our next-gen small uP to be RP2040. Digikey has 25K
> in stock for 70 cents at any quantity.

Yeah, those look kind of nice; but "time to learn". Here I'm just
tripping on "oh this bit is a little different than the MegaX8 or TinyX5
lineups I'm used to". Granted, I'm only messing about with these things
as a hobby; so my biggest "production run" is like ... 3 boards :D

--
|_|O|_|
|_|_|O| Github: https://github.com/dpurgert
|O|O|O| PGP: DDAB 23FB 19FA 7D85 1CC1 E067 6D65 70E5 4CE7 2860

On Wed, 6 Dec 2023 18:02:06 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 2023-12-06 12:08, John Larkin wrote:
>> On Wed, 6 Dec 2023 12:23:51 -0000 (UTC), Dan Purgert <dan@djph.net>
>> wrote:
>>
>>> On 2023-12-06, John Larkin wrote:
>>>> On Tue, 5 Dec 2023 16:50:52 -0000 (UTC), Dan Purgert <dan@djph.net>
>>>> wrote:
>>>>
>>>>> On 2023-12-05, John Larkin wrote:
>>>>>> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
>>>>>> <ethan.jonhson05234@gmail.com> wrote:
>>>>>>
>>>>>>> test
>>>>>>
>>>>>> OK
>>>>>
>>>>> John,
>>>>> They might need something a little clearer -- perhaps this:
>>>>>
>>>>> "Test Successfully Failed. Message wasn't sent to a -test group."
>>>>>
>>>>> (and perhaps guidance in picking a better news client)
>>>>
>>>> Maybe EJ wants to discuss electronics. In that case, welcome.
>>>
>>> Hope so, it'll be a nice change from the OT posts (of which I'm guilty
>>> of making too :| )
>>>
>>>>
>>>> I was just thinking about (and spicing) DDS lowpass filters. With
>>>> enough DAC bits and a really fast clock, you barely need one.
>>>>
>>>
>>> Spice is one of those things I ought to learn at some point.
>>
>> LT Spice is easy to learn and use. It has some logic elements too, so
>> you can make mixed-type circuits, like delta-sigma modulators or DDS
>> filters and even real logic systems, admittedly simple ones. Things
>> like pseudo-random shift registers for example.
>>
>> It is cool to do FFT spectral analysis and such on digital circuits.
>>
>> It's useful for leaving behind documentation, design notes, too. IF
>> one bothers to properly label things, which hardly anyone does.
>>
>>>
>>> For now, I'm safely separated from most analog (RC lowpass filters on
>>> inputs are about the extent of it) while I work through wrapping my head
>>> around the new (to me) 0-series AVR chips and write up some drivers for
>>> the onboard peripherals.
>>
>> I'm lobbying for our next-gen small uP to be RP2040. Digikey has 25K
>> in stock for 70 cents at any quantity.
>>
>We're thinking along the same lines.
>
>Cheers
>
>Phil Hobbs

I've had guys spend many weeks just setting up a PC and linux and dev
tools to use a Zynq or whatever.

https://www.explainxkcd.com/wiki/index.php/456:_Cautionary

An RP400 is the whole dev/debug system for $75, and runs right out of
the box. No FlexLM or any such nonsense.

I'm planning a PC board that will plug into the RP400 on one end and
into the DUT on the other end, two ribbon cables. My products will
have an RP2040, a PoE power supply, a gbit ethernet chip, USB, and a
standard fine-pitch ribbon cable connector to the debug board.

https://www.dropbox.com/scl/fi/1c06h0u101c9cyh2d6ifi/Z556_1.jpg?rlkey=mswvdbxm2q9m9ks7un90cvax9&raw=1

I figure I can use one 2040 core for all the overhead nonsense:
ethernet, usb, command parsing, calibrations, whatever. And run the
other core out of sram bare-metal bit-bang i/o, which could in many
cases eliminate needing an FPGA.

Wanna collaborate?

I'm wondering if I can decimate an isolated delta-sigma ADC in
software, with a little help from one of the SPI interfaces.

I can certainly bit-bang a VME bus.

Maybe do a software DDS sine generator, bang a DAC and an ADC, and do
some software synchronous detection? I want to measure a capacitor
that's 100 feet away, or some lvdt's and synchros.

This could be fun.

On a sunny day (Wed, 06 Dec 2023 17:13:39 -0800) it happened john larkin
<jl@650pot.com> wrote in <0752nihjglnuss071sa2pjoprh9v66b750@4ax.com>:

>On Wed, 6 Dec 2023 18:02:06 -0500, Phil Hobbs
><pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>>On 2023-12-06 12:08, John Larkin wrote:
>>> On Wed, 6 Dec 2023 12:23:51 -0000 (UTC), Dan Purgert <dan@djph.net>
>>> wrote:
>>>
>>>> On 2023-12-06, John Larkin wrote:
>>>>> On Tue, 5 Dec 2023 16:50:52 -0000 (UTC), Dan Purgert <dan@djph.net>
>>>>> wrote:
>>>>>
>>>>>> On 2023-12-05, John Larkin wrote:
>>>>>>> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
>>>>>>> <ethan.jonhson05234@gmail.com> wrote:
>>>>>>>
>>>>>>>> test
>>>>>>>
>>>>>>> OK
>>>>>>
>>>>>> John,
>>>>>> They might need something a little clearer -- perhaps this:
>>>>>>
>>>>>> "Test Successfully Failed. Message wasn't sent to a -test group."
>>>>>>
>>>>>> (and perhaps guidance in picking a better news client)
>>>>>
>>>>> Maybe EJ wants to discuss electronics. In that case, welcome.
>>>>
>>>> Hope so, it'll be a nice change from the OT posts (of which I'm guilty
>>>> of making too :| )
>>>>
>>>>>
>>>>> I was just thinking about (and spicing) DDS lowpass filters. With
>>>>> enough DAC bits and a really fast clock, you barely need one.
>>>>>
>>>>
>>>> Spice is one of those things I ought to learn at some point.
>>>
>>> LT Spice is easy to learn and use. It has some logic elements too, so
>>> you can make mixed-type circuits, like delta-sigma modulators or DDS
>>> filters and even real logic systems, admittedly simple ones. Things
>>> like pseudo-random shift registers for example.
>>>
>>> It is cool to do FFT spectral analysis and such on digital circuits.
>>>
>>> It's useful for leaving behind documentation, design notes, too. IF
>>> one bothers to properly label things, which hardly anyone does.
>>>
>>>>
>>>> For now, I'm safely separated from most analog (RC lowpass filters on
>>>> inputs are about the extent of it) while I work through wrapping my head
>>>> around the new (to me) 0-series AVR chips and write up some drivers for
>>>> the onboard peripherals.
>>>
>>> I'm lobbying for our next-gen small uP to be RP2040. Digikey has 25K
>>> in stock for 70 cents at any quantity.
>>>
>>We're thinking along the same lines.
>>
>>Cheers
>>
>>Phil Hobbs
>
>I've had guys spend many weeks just setting up a PC and linux and dev
>tools to use a Zynq or whatever.
>
>https://www.explainxkcd.com/wiki/index.php/456:_Cautionary
>
>An RP400 is the whole dev/debug system for $75, and runs right out of
>the box. No FlexLM or any such nonsense.
>
>I'm planning a PC board that will plug into the RP400 on one end and
>into the DUT on the other end, two ribbon cables. My products will
>have an RP2040, a PoE power supply, a gbit ethernet chip, USB, and a
>standard fine-pitch ribbon cable connector to the debug board.
>
>https://www.dropbox.com/scl/fi/1c06h0u101c9cyh2d6ifi/Z556_1.jpg?rlkey=mswvdbxm2q9m9ks7un90cvax9&raw=1
>
>I figure I can use one 2040 core for all the overhead nonsense:
>ethernet, usb, command parsing, calibrations, whatever. And run the
>other core out of sram bare-metal bit-bang i/o, which could in many
>cases eliminate needing an FPGA.

Been working like that now for 10 years or so:
https://panteltje.nl/pub/raspberry_pi_datv_transmitter_test_setup_IMG_3937.JPG
Use a normal Raspberry Pi with wireless keyboad or via SSH from your normal PC / laptop.
whatever :-)
https://panteltje.nl/pub/proof_of_concept_setup_27MHz_to_7MHz_IMG_4558.JPG

https://panteltje.nl/pub/raspberry_pi_interface_to_pic_programmer_IXIMG_1345.JPG

PCs have not been on for month.
Safer too:
https://arstechnica.com/security/2023/12/just-about-every-windows-and-linux-device-vulnerable-to-new-logofail-firmware-attack/

On 2023-12-06 20:13, john larkin wrote:
> On Wed, 6 Dec 2023 18:02:06 -0500, Phil Hobbs
> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>
>> On 2023-12-06 12:08, John Larkin wrote:
>>> On Wed, 6 Dec 2023 12:23:51 -0000 (UTC), Dan Purgert <dan@djph.net>
>>> wrote:
>>>
>>>> On 2023-12-06, John Larkin wrote:
>>>>> On Tue, 5 Dec 2023 16:50:52 -0000 (UTC), Dan Purgert <dan@djph.net>
>>>>> wrote:
>>>>>
>>>>>> On 2023-12-05, John Larkin wrote:
>>>>>>> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
>>>>>>> <ethan.jonhson05234@gmail.com> wrote:
>>>>>>>
>>>>>>>> test
>>>>>>>
>>>>>>> OK
>>>>>>
>>>>>> John,
>>>>>> They might need something a little clearer -- perhaps this:
>>>>>>
>>>>>> "Test Successfully Failed. Message wasn't sent to a -test group."
>>>>>>
>>>>>> (and perhaps guidance in picking a better news client)
>>>>>
>>>>> Maybe EJ wants to discuss electronics. In that case, welcome.
>>>>
>>>> Hope so, it'll be a nice change from the OT posts (of which I'm guilty
>>>> of making too :| )
>>>>
>>>>>
>>>>> I was just thinking about (and spicing) DDS lowpass filters. With
>>>>> enough DAC bits and a really fast clock, you barely need one.
>>>>>
>>>>
>>>> Spice is one of those things I ought to learn at some point.
>>>
>>> LT Spice is easy to learn and use. It has some logic elements too, so
>>> you can make mixed-type circuits, like delta-sigma modulators or DDS
>>> filters and even real logic systems, admittedly simple ones. Things
>>> like pseudo-random shift registers for example.
>>>
>>> It is cool to do FFT spectral analysis and such on digital circuits.
>>>
>>> It's useful for leaving behind documentation, design notes, too. IF
>>> one bothers to properly label things, which hardly anyone does.
>>>
>>>>
>>>> For now, I'm safely separated from most analog (RC lowpass filters on
>>>> inputs are about the extent of it) while I work through wrapping my head
>>>> around the new (to me) 0-series AVR chips and write up some drivers for
>>>> the onboard peripherals.
>>>
>>> I'm lobbying for our next-gen small uP to be RP2040. Digikey has 25K
>>> in stock for 70 cents at any quantity.
>>>
>> We're thinking along the same lines.
>>
>> Cheers
>>
>> Phil Hobbs
>
> I've had guys spend many weeks just setting up a PC and linux and dev
> tools to use a Zynq or whatever.
>
> https://www.explainxkcd.com/wiki/index.php/456:_Cautionary
>
> An RP400 is the whole dev/debug system for $75, and runs right out of
> the box. No FlexLM or any such nonsense.
>
> I'm planning a PC board that will plug into the RP400 on one end and
> into the DUT on the other end, two ribbon cables. My products will
> have an RP2040, a PoE power supply, a gbit ethernet chip, USB, and a
> standard fine-pitch ribbon cable connector to the debug board.
>
> https://www.dropbox.com/scl/fi/1c06h0u101c9cyh2d6ifi/Z556_1.jpg?rlkey=mswvdbxm2q9m9ks7un90cvax9&raw=1
>
> I figure I can use one 2040 core for all the overhead nonsense:
> ethernet, usb, command parsing, calibrations, whatever. And run the
> other core out of sram bare-metal bit-bang i/o, which could in many
> cases eliminate needing an FPGA.
>
> Wanna collaborate?
>
> I'm wondering if I can decimate an isolated delta-sigma ADC in
> software, with a little help from one of the SPI interfaces.
>
> I can certainly bit-bang a VME bus.
>
> Maybe do a software DDS sine generator, bang a DAC and an ADC, and do
> some software synchronous detection? I want to measure a capacitor
> that's 100 feet away, or some lvdt's and synchros.
>
> This could be fun.
>
>
>
Sure, I'm in. Simon's the actual s/w guy round here these days, but I'm
very interested in figuring out better ways to do finely interleaved
control and data acq, which is hard with a PC or Linux SBC.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC / Hobbs ElectroOptics
Optics, Electro-optics, Photonics, Analog Electronics
Briarcliff Manor NY 10510

http://electrooptical.net
http://hobbs-eo.com

On Thu, 7 Dec 2023 16:34:20 -0500, Phil Hobbs
<pcdhSpamMeSenseless@electrooptical.net> wrote:

>On 2023-12-06 20:13, john larkin wrote:
>> On Wed, 6 Dec 2023 18:02:06 -0500, Phil Hobbs
>> <pcdhSpamMeSenseless@electrooptical.net> wrote:
>>
>>> On 2023-12-06 12:08, John Larkin wrote:
>>>> On Wed, 6 Dec 2023 12:23:51 -0000 (UTC), Dan Purgert <dan@djph.net>
>>>> wrote:
>>>>
>>>>> On 2023-12-06, John Larkin wrote:
>>>>>> On Tue, 5 Dec 2023 16:50:52 -0000 (UTC), Dan Purgert <dan@djph.net>
>>>>>> wrote:
>>>>>>
>>>>>>> On 2023-12-05, John Larkin wrote:
>>>>>>>> On Tue, 5 Dec 2023 07:24:08 -0800 (PST), Ethan Johnson
>>>>>>>> <ethan.jonhson05234@gmail.com> wrote:
>>>>>>>>
>>>>>>>>> test
>>>>>>>>
>>>>>>>> OK
>>>>>>>
>>>>>>> John,
>>>>>>> They might need something a little clearer -- perhaps this:
>>>>>>>
>>>>>>> "Test Successfully Failed. Message wasn't sent to a -test group."
>>>>>>>
>>>>>>> (and perhaps guidance in picking a better news client)
>>>>>>
>>>>>> Maybe EJ wants to discuss electronics. In that case, welcome.
>>>>>
>>>>> Hope so, it'll be a nice change from the OT posts (of which I'm guilty
>>>>> of making too :| )
>>>>>
>>>>>>
>>>>>> I was just thinking about (and spicing) DDS lowpass filters. With
>>>>>> enough DAC bits and a really fast clock, you barely need one.
>>>>>>
>>>>>
>>>>> Spice is one of those things I ought to learn at some point.
>>>>
>>>> LT Spice is easy to learn and use. It has some logic elements too, so
>>>> you can make mixed-type circuits, like delta-sigma modulators or DDS
>>>> filters and even real logic systems, admittedly simple ones. Things
>>>> like pseudo-random shift registers for example.
>>>>
>>>> It is cool to do FFT spectral analysis and such on digital circuits.
>>>>
>>>> It's useful for leaving behind documentation, design notes, too. IF
>>>> one bothers to properly label things, which hardly anyone does.
>>>>
>>>>>
>>>>> For now, I'm safely separated from most analog (RC lowpass filters on
>>>>> inputs are about the extent of it) while I work through wrapping my head
>>>>> around the new (to me) 0-series AVR chips and write up some drivers for
>>>>> the onboard peripherals.
>>>>
>>>> I'm lobbying for our next-gen small uP to be RP2040. Digikey has 25K
>>>> in stock for 70 cents at any quantity.
>>>>
>>> We're thinking along the same lines.
>>>
>>> Cheers
>>>
>>> Phil Hobbs
>>
>> I've had guys spend many weeks just setting up a PC and linux and dev
>> tools to use a Zynq or whatever.
>>
>> https://www.explainxkcd.com/wiki/index.php/456:_Cautionary
>>
>> An RP400 is the whole dev/debug system for $75, and runs right out of
>> the box. No FlexLM or any such nonsense.
>>
>> I'm planning a PC board that will plug into the RP400 on one end and
>> into the DUT on the other end, two ribbon cables. My products will
>> have an RP2040, a PoE power supply, a gbit ethernet chip, USB, and a
>> standard fine-pitch ribbon cable connector to the debug board.
>>
>> https://www.dropbox.com/scl/fi/1c06h0u101c9cyh2d6ifi/Z556_1.jpg?rlkey=mswvdbxm2q9m9ks7un90cvax9&raw=1
>>
>> I figure I can use one 2040 core for all the overhead nonsense:
>> ethernet, usb, command parsing, calibrations, whatever. And run the
>> other core out of sram bare-metal bit-bang i/o, which could in many
>> cases eliminate needing an FPGA.
>>
>> Wanna collaborate?
>>
>> I'm wondering if I can decimate an isolated delta-sigma ADC in
>> software, with a little help from one of the SPI interfaces.
>>
>> I can certainly bit-bang a VME bus.
>>
>> Maybe do a software DDS sine generator, bang a DAC and an ADC, and do
>> some software synchronous detection? I want to measure a capacitor
>> that's 100 feet away, or some lvdt's and synchros.
>>
>> This could be fun.
>>
>>
>>
>Sure, I'm in. Simon's the actual s/w guy round here these days, but I'm
>very interested in figuring out better ways to do finely interleaved
>control and data acq, which is hard with a PC or Linux SBC.
>
>Cheers
>
>Phil Hobbs

You may be interested in reviewing our proposed debug board. Then you
can have a few.

Is Simon interested in using the RP400 for development and debug? They
cost $75 each.

As regards decimating delta-sigma in software, Rob says that there's
an algorithm for summing all the bits in a 32-bit word in 6
instructions or something improbable like that. So if the SPI
interface can give us 32 bit ADC words from a 20 MHz stream, that's a
word rate of 625 KHz, and six instruction will only take about 60 ns,
so we're fine.

The RP2040 can run a giant pokey program on one core from cached flash
and the other core can execute from real on-chip sram, at 130 MHz, so
we could do some screaming state machines.

Are you interested in PoE?