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    Duet 2 Ethernet and SBC

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    • smoki3undefined
      smoki3 @A Former User
      last edited by smoki3

      @bearer thanks!

      I googled for it but unter "duet 3 schematics" you don't get it 🙂

      In the duet3 schematics they use 100Ohm resistors.

      The duet 2 has for MOSI, MISO and SPCK 47 Ohm and for NPSC0 and EDR 2,2 kOhm

      @T3P3Tony NPSC0 and EDR have no influence on the speed, right?

      wilrikerundefined 1 Reply Last reply Reply Quote 0
      • wilrikerundefined
        wilriker @smoki3
        last edited by

        @smoki3 said in Duet 2 Ethernet and SBC:

        @T3P3Tony NPSC0 and EDR have no influence on the speed, right?

        That's correct.

        I tested with no resistors and with 500R (two 1K in parallel since that's what I just had at hand at the time). The difference is significant but at the same time negligible. Without resistors you can get up to 25-27MHz. With 500R in series you "only" get 13.5-15MHz - but that's still plenty and most likely more than your ever need while at the same time providing you much more protection.

        @Dougal1957 DSF is absolutely the same. It does neither know nor care if it's a D3 or a D2 on the other end.

        Manuel
        Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
        with probably always latest firmware/DWC (incl. betas or self-compiled)
        My Tool Collection

        smoki3undefined A Former User? 3 Replies Last reply Reply Quote 0
        • smoki3undefined
          smoki3 @wilriker
          last edited by

          @wilriker

          Okay cool. I just ordered some experimental stripboards and the 26 pin connector. So I can test it next week.

          I will build up a small pcb with the resistors on it.

          So I will just add some resistors to the MISO, MOSI and SPCK pins. The 2.2kOhm on the two other pins should be enough.

          How fast is an ESP? Do they also reach the 25 MHz?

          wilrikerundefined 1 Reply Last reply Reply Quote 0
          • wilrikerundefined
            wilriker @smoki3
            last edited by

            @smoki3 said in Duet 2 Ethernet and SBC:

            How fast is an ESP? Do they also reach the 25 MHz?

            The current configuration sets it to 26.7MHz. The ESP (clocked at 80MHz) can go up to at least 40MHz from what I can see in the source code comments.

            Manuel
            Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
            with probably always latest firmware/DWC (incl. betas or self-compiled)
            My Tool Collection

            smoki3undefined 1 Reply Last reply Reply Quote 0
            • smoki3undefined
              smoki3 @wilriker
              last edited by

              @wilriker what's the worst case scenario if I connect it directly? Or otherwise what if the speed is to slow (if I choose to big resistors)?

              wilrikerundefined 1 Reply Last reply Reply Quote 0
              • wilrikerundefined
                wilriker @smoki3
                last edited by

                @smoki3 So worst case: you fry the SAM4E on the Duet or the ARM of the RPi. That's easy. 😂

                Let's put the answer about speed this way: currently the default configuration for Duet Software Framework (which controls the SPI speed) is set to 8 MHz for a Duet 3 (which coincidentally has virtually the same max SPI speed as a Duet 2). And so far there have been very to no occasions where this would not have sufficed. So if you run it at 15MHz (with ~500R series resistors) you are still about twice the speed of the normal D3-SBC speed. I guess you run into step-generation limits before you see issues with SPI speed.

                Manuel
                Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                with probably always latest firmware/DWC (incl. betas or self-compiled)
                My Tool Collection

                smoki3undefined 1 Reply Last reply Reply Quote 1
                • smoki3undefined
                  smoki3 @wilriker
                  last edited by

                  @wilriker
                  allright. I will test it soon!

                  1 Reply Last reply Reply Quote 0
                  • smoki3undefined
                    smoki3
                    last edited by

                    @wilriker does the duet 2 provide enough current on the 5 volt circuit to power the pi? Or is it better to use a separate stepdown module

                    dc42undefined 1 Reply Last reply Reply Quote 0
                    • dc42undefined
                      dc42 administrators @smoki3
                      last edited by

                      @smoki3 said in Duet 2 Ethernet and SBC:

                      @wilriker does the duet 2 provide enough current on the 5 volt circuit to power the pi? Or is it better to use a separate stepdown module

                      The 5V regulator on Duet 2 does not provide enough current to power a Pi safely.

                      Duet WiFi hardware designer and firmware engineer
                      Please do not ask me for Duet support via PM or email, use the forum
                      http://www.escher3d.com, https://miscsolutions.wordpress.com

                      1 Reply Last reply Reply Quote 1
                      • A Former User?
                        A Former User @wilriker
                        last edited by A Former User

                        @wilriker said in Duet 2 Ethernet and SBC:

                        I tested with no resistors and with 500R

                        thanks for your effort with this btw! which branch would be the best bet to build Duet2_SBC_RTOS/Duet2CombinedFirmware.bin? nvm checking that all the repos have been switched from dc42 to duet3d github turned out to be an idea

                        smoki3undefined 1 Reply Last reply Reply Quote 0
                        • smoki3undefined
                          smoki3 @A Former User
                          last edited by smoki3

                          @bearer I build 3.02 branch with the SBC Configuration. This should work.

                          The build have a different file name. So you have to rename it to flash it over DWC

                          wilrikerundefined 1 Reply Last reply Reply Quote 0
                          • wilrikerundefined
                            wilriker @smoki3
                            last edited by

                            @smoki3 Yes, for initial flashing you have to rename it or flash it via bossa (as I did). If you also build DuetIAP and put this into the /sys folder of DSF you can from then on do regular flashing by just uploading the firmware file as is in DWC.

                            Manuel
                            Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                            with probably always latest firmware/DWC (incl. betas or self-compiled)
                            My Tool Collection

                            smoki3undefined 1 Reply Last reply Reply Quote 0
                            • smoki3undefined
                              smoki3 @wilriker
                              last edited by

                              @wilriker is it a different DuetIAP as the normal build which is released on GitHub?

                              wilrikerundefined 1 Reply Last reply Reply Quote 0
                              • wilrikerundefined
                                wilriker @smoki3
                                last edited by wilriker

                                @smoki3 Yes, it's a new version that will be part of the RRF 3.2.0. You have to clone DuetIAP and have to build SAM4E_SPI_RAM build configuration. This will create a file name Duet2_SBCiap_2SBC.bin.

                                Manuel
                                Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                                with probably always latest firmware/DWC (incl. betas or self-compiled)
                                My Tool Collection

                                1 Reply Last reply Reply Quote 0
                                • A Former User?
                                  A Former User
                                  last edited by

                                  @wilriker did you see anything like https://forum.duet3d.com/post/162547 in your testing?

                                  (that is with 330R inline on the MOSI, MISO and SCK signals, but the ESP is in place with its pins as hi-z and sleeping).

                                  i'll see if I can't put some 2.0mm headers on there so I can switch between WiFi and SBC but will take a while

                                  wilrikerundefined 1 Reply Last reply Reply Quote 0
                                  • wilrikerundefined
                                    wilriker @A Former User
                                    last edited by wilriker

                                    @bearer I remember that I have seen the

                                    6/26/2020, 11:51:59 AM	Connection to Duet established
                                    6/26/2020, 11:52:01 AM	Warning: Lost connection to Duet (Board is not available (no data response))
                                    

                                    cycle at least once but I don't remember what the reason/solution was (as there were a lot of errors at that time 😁 ). And I have only ever tested with a Duet 2 Ethernet.

                                    Unlikely but: did you use the GPIO0 on the ESP as the TransferReady pin? I remember that while testing I got confused that the header for Ethernet does not have all the pins that the ESP needs and thus some contact points where not what I expected in the first place. Usually if you get that wrong DSF will complain about Duet not being available, though.

                                    EDIT: I only now saw that you get a connection every once in a while (in your example to issue M115). That means basic connection is working. And if SPI speed would be too high that would result in checksum errors rather than no data errors.

                                    EDIT2: There have been a lot of refactorings lately. Let me quickly check if it still works on my test hardware.

                                    EDIT3: That still works (although I get an error with DCS not being able to deserialize a status update but that's something different).

                                    Manuel
                                    Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                                    with probably always latest firmware/DWC (incl. betas or self-compiled)
                                    My Tool Collection

                                    1 Reply Last reply Reply Quote 0
                                    • A Former User?
                                      A Former User
                                      last edited by

                                      @wilriker haha! Don't worry about it too much, it was just a stab in the dark as I had someone to help me with the wiring. I'll get back to it in a couple of weeks.

                                      Anyways yes, i did use gpio0 or EDR_CONN as the net is called, which looked to be the same pin the w5500 uses, and as M115 did manage to sneak through I presumed that was ok. And despite not seeing checksum errors I tried dropping the SPI speed but made no difference.

                                      I just wanted to see if it was possible to not remove the ESP, so far either i messed up hi-z firmware, or it has to GTFO. Thanks for taking a look!

                                      1 Reply Last reply Reply Quote 0
                                      • smoki3undefined
                                        smoki3
                                        last edited by smoki3

                                        I finished my prototypeIMG_20200626_150504.jpg

                                        It has a 5V 3A regulator on it for the raspberry

                                        A Former User? 1 Reply Last reply Reply Quote 2
                                        • A Former User?
                                          A Former User @smoki3
                                          last edited by A Former User

                                          @smoki3 said in Duet 2 Ethernet and SBC:

                                          It has a 5V 3A regulator on it for the raspberry

                                          have you considered the load on the 1A fuse for the fans when you're taking a good chunk out for the 5v buck?

                                          smoki3undefined 1 Reply Last reply Reply Quote 0
                                          • dc42undefined
                                            dc42 administrators
                                            last edited by dc42

                                            @bearer said in Duet 2 Ethernet and SBC:

                                            I just wanted to see if it was possible to not remove the ESP, so far either i messed up hi-z firmware, or it has to GTFO. Thanks for taking a look!

                                            If the firmware sets up the ESP reset pin and EN pins as outputs in the low state, then I think it should work without disconnecting the ESP. The additional capacitance of the ESP pins might reduce the maximum available SPI speed a little, but that speed isn't critical.

                                            Duet WiFi hardware designer and firmware engineer
                                            Please do not ask me for Duet support via PM or email, use the forum
                                            http://www.escher3d.com, https://miscsolutions.wordpress.com

                                            A Former User? 1 Reply Last reply Reply Quote 0
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