New Raspberry Pi Zero 2W

o_lampe

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

chrishamm

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.

o_lampe

@pcr said in New Raspberry Pi Zero 2W:

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

Ich habe heute einen Zero 2W bestellt, aber ich habe weder Duet3 oder Mini5+.
Vielleicht @cosmowave ?

English: I've ordered a Z2W, but don't have duet3 nor Mini5...maybe Cosmowave?

PCR

@pcr

pi@raspberrypi:~ $ neofetch
  `.::///+:/-.        --///+//-:``    pi@raspberrypi 
 `+oooooooooooo:   `+oooooooooooo:    -------------- 
  /oooo++//ooooo:  ooooo+//+ooooo.    OS: Raspbian GNU/Linux 10 (buster) armv7l 
  `+ooooooo:-:oo-  +o+::/ooooooo:     Host: Raspberry Pi Zero 2 Rev 1.0 
   `:oooooooo+``    `.oooooooo+-      Kernel: 5.10.63-v7+ 
     `:++ooo/.        :+ooo+/.`       Uptime: 10 mins 
        ...`  `.----.` ``..           Packages: 533 (dpkg) 
     .::::-``:::::::::.`-:::-`        Shell: bash 5.0.3 
    -:::-`   .:::::::-`  `-:::-       Terminal: /dev/pts/0 
   `::.  `.--.`  `` `.---.``.::`      CPU: BCM2835 (4) @ 1.000GHz 
       .::::::::`  -::::::::` `       Memory: 49MiB / 427MiB 
 .::` .:::::::::- `::::::::::``::.
-:::` ::::::::::.  ::::::::::.`:::-                           
::::  -::::::::.   `-::::::::  ::::
-::-   .-:::-.``....``.-::-.   -::-
 .. ``       .::::::::.     `..`..
   -:::-`   -::::::::::`  .:::::`
   :::::::` -::::::::::` :::::::.
   .:::::::  -::::::::. ::::::::
    `-:::::`   ..--.`   ::::::.
      `...`  `...--..`  `...`
            .::::::::::
             `.-::::-`

pi@raspberrypi:~ $ ls /opt/dsf/sd
filaments  firmware  gcodes  macros  menu  sys  www

New Raspberry Pi Zero 2W

Robert J.