New Raspberry Pi Zero 2W

o_lampe

@jay_s_uk said in New Raspberry Pi Zero 2W:

@pcr I wonder if 512mb is enough ram???

[OT] On my Odroid headless MCU cluster I defined 1GB RAM of each MCU as Ram-disk and the Head-MCU could access them as Swap-drive. This way I had +8GB swap drive with network read/write speed (1GBit LAN).

Maybe we can install a swap-drive here with USB-speed (SSD?)
//edit there's an official RPi eMMC_to_SD-card with 32GB, might be a good compromise?

T3P3Tony

RP3A0, a custom-built system-in-package designed by Raspberry Pi in the UK
I wonder what interesting yet to be discovered kernel/driver "features" lie in wait here

definitely worth giving it a go though!

o_lampe

How much free RAM does a RPi 3 or 4 show after DSF has booted?

chrishamm

@o_lampe On DuetPi:

pi@duet3:~ $ free -h
              total        used        free      shared  buff/cache   available
Mem:          3.7Gi       342Mi       2.9Gi        58Mi       511Mi       3.2Gi
Swap:          99Mi          0B        99Mi

On DuetPi-lite (no GUI):

pi@Ender3Pro ~> free -h
              total        used        free      shared  buff/cache   available
Mem:          1.8Gi       128Mi       1.5Gi       8.0Mi       175Mi       1.6Gi
Swap:          99Mi          0B        99Mi

Both are running on two different RPi 4s. I suspect some more RAM could be saved by turning off some more system services (like bluetooth and pulseaudio).

o_lampe

@chrishamm Even in GUI mode it only takes ~350MB, that should work with the Zero 2W. But slicing is a different story.

o_lampe

Don't want to highjack the thread, but while shopping in the raspberry shop, I saw the RP2040 aka. Raspberry Pi Pico.
It has a very low price and comes with a Cortex M0 MCU. I wonder if it would work as Arduino nano replacement, or even better as a mini toolboard MCU?

rjenkinsgb

@o_lampe said in New Raspberry Pi Zero 2W:

It has a very low price and comes with a Cortex M0 MCU.

On that off-topic subject
I've been playing with some Seeed Xiao boards - again an M0 CPU with 256K flash, 32K RAM. About £5 on ebay and minuscule things, 17x20mm. Info:
https://wiki.seeedstudio.com/Seeeduino-XIAO/

I'd not thought of them in relation to 3D printing, but for a small, light auxiliary interface, they should be good.

T3P3Tony

@o_lampe said in New Raspberry Pi Zero 2W:

mini toolboard MCU?

if someone wrote the code to use one of the pico processor cores to simulate CAN-FD fast enough then just maybe but that could well be impossible.

o_lampe

@t3p3tony
I tried to find a Pico board with Sam-C21 and CAN-FD.
As Toolbord in the classic sense is difficult, but it could do some light duty chores, like extra fans, thermistors or other less timing relevant things.

T3P3Tony

@o_lampe i see using it as a coprocessor. There could be applications for a coprocessor (maybe not so much a toolboard but on a mainboard) but it adds significantly to the complexity of many things (think a firmware update).

o_lampe

@t3p3tony said in New Raspberry Pi Zero 2W:

There could be applications for a coprocessor (maybe not so much a toolboard but on a mainboard) but it adds significantly to the complexity of many things (think a firmware update).

I'd happily go that extra mile, if it helps the huge Duet2-community "over the hump" and enables it to benefit from future development.
The M0 processor has ~twice the power of the onboard MCU. If we'd use the onboard MCU as gateway and the M0 as mainprocessor, it would be a huge leap forward. (just dreaming)

T3P3Tony

@o_lampe I don't understand exactly what you are proposing? what would the board with the pico do? how would it communicate (and what hump are we getting over?)

o_lampe

@t3p3tony the M0 could do the multi-stream gcode analysis, while the onboard MCU does the pulse-generating for steppers, PWM a.s.o.
The hump is the limited RAM of the duet2 mcu

dc42

@o_lampe said in New Raspberry Pi Zero 2W:

@t3p3tony
I tried to find a Pico board with Sam-C21 and CAN-FD.

See https://duet3d.dozuki.com/Wiki/Using_the_Sammy-C21_development_board_with_Duet_3.

PCR

o_lampe

@dc42 I know the board, but it's out off stock and quite expensive. (27EUR vs 4EUR)
But I'd still consider it as Duet2 CoPro as described above.

@T3P3Tony I wouldn't mind to delete the last posts and start a new thread, although everything I posted about the M0 is IMHO also valid for the Zero 2W and any other SBC

T3P3Tony

@pcr nice! why the two different headers, one for Duet 3 and one for the 3 mini?

PCR

@t3p3tony yes. I dont want to Stack in diectly on the Board. Because of some connectors. And yes the Header is placed diffrently on duet 3 and Duet Mini ;(

PCR

@pcr btw someone from Germany who Likes to Test the Board ?

zapta

@t3p3tony said in New Raspberry Pi Zero 2W:

definitely worth giving it a go though!

How about a duet controller board with a plugged in Pi Zero for both controller and SBC functionalities?

Edit: or a Pi Zero and a minimal MCU for i/o only, basically a Klipper style RRF on a single board.

New Raspberry Pi Zero 2W

Robert J.