Raspberry Pi 4 mmap

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16 May 2020 23:57 #168016 by helioz2000
Replied by helioz2000 on topic Raspberry Pi 4

Thank you Helioz.
Right now I'm just trying to figure out how to power the board and my RPi4.

The Pi doesn't have a set of 5V terminals for power, it has the USB-C (or older microUSB) port and the 40pin header.
Powering the 7C81 via the Pi is theoretically possible but not very practical.
Powering the Pi via the USB connector is marginal at the best of times and I certainly wouldn't want to draw even more current though the Pi into the 7C81 and possibly more Mesa IO boards.
The 40pin header is used to connect the 7C81 so isn't really available for power supply.

The 7C81 on the other hand has proper 5V terminals which are capable of supplying power not only to the 7C81 but also to Pi and Mesa IO modules.

The Pi is a power hungry beast and it's peak power draw is between 1-2A, especially when using WiFi. It is common for Pi's to suffer from Voltage drop when powered via the [older] microUSB ports ..... and that's without any additional periphery. Trust me, I've had plenty of low voltage alarms on my other Pi's and I generally try to avoid powering them via the old microUSB as these interfaces are simply not designed to carry the current required by the Pi.

My linuxCNC Pi is supplied via the 7C81 from a 5V 3A power supply and has never suffered "low voltage" issues.

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20 May 2020 16:12 #168388 by viktan
Replied by viktan on topic Raspberry Pi 4
Please, is there some easy way to get linuxcnc-dev installed?
if I remember correctly before it was something like apt-get install linuxcnc-dev

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01 Jul 2020 09:47 - 01 Jul 2020 09:53 #173302 by Turambar25
Replied by Turambar25 on topic Raspberry Pi 4 & 7i90

Have you seen or tried this
gnipsel.com/linuxcnc/uspace/rpi4-rt.html


I followed these instructions and had linuxcnc running in about 3 or 4 hours. I haven't used it yet, but at least it finally installed.

Does anyone have a link for completely built pi4 images in case this doesn't work for me? No search came up with anything functional, but I might have missed something.

Eventually, I also need to install it on a pi2.
Last edit: 01 Jul 2020 09:53 by Turambar25. Reason: forgot to quote

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01 Jul 2020 19:22 - 02 Jul 2020 05:10 #173334 by Markyd
Replied by Markyd on topic Raspberry Pi 4 & 7i90
Is there a tutorial for getting the GPIO working? I've used the tutorial to install linuxcnc on my rpi4 and can start it, but no idea how to drive a stepper driver from the GPIO. I know it involves a HAL file but thats about the extent of my knowledge at the moment.
Last edit: 02 Jul 2020 05:10 by Markyd. Reason: Typo

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08 Jul 2020 04:13 #173952 by blazini36
Replied by blazini36 on topic Raspberry Pi 4 & 7i90
Does anyone have any insight on how fast you can reliably bang a rpi GPIO pin using the hal_rpi_gpio component?

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09 Aug 2020 12:40 #177745 by tjtr33
Replied by tjtr33 on topic Raspberry Pi 4 LinuxCNC
If you are looking for hardware stepping and a small 'pi' controller,
then please look at what our Russian colleagues have done with CNC-32.ru.
I have an orange-pi with linuxcnc ( not machine kit) running very high step rates.
The OrangePi has an ARISC co-processor that can handle the stepping.
I have not yet integrated this into a machine system, but, since a stepper system
configuration without any real hardware still exercises the hardware stepgen...
I can be amazed by running Chips3D in Axis faster than you can read this note.

Please visit orangecnc.gitlab.io/
also information is really scattered , so please see the forum thread
forum.linuxcnc.org/18-computer/39037-lin...e-pi?start=40#177682

tomp (with LinuxCNC when BDI was news)
The following user(s) said Thank You: Mike_Eitel

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14 Aug 2020 22:05 - 14 Aug 2020 22:07 #178210 by faradaygv
Replied by faradaygv on topic Raspberry Pi 4 LinuxCNC
We tested the project with the ARISC driver at the address you provided, and by writing a message on the 192. page of the forum site, we observed that the system caused a shift in the range of + -0.5 millimeters after 10 minutes of operation. They thanked 192 pages on forum sites, and a servant of allh did not try it on cnc. Do not direct, too, a waste of time.
"Greetings from Turkey"
Last edit: 14 Aug 2020 22:07 by faradaygv. Reason: sorry

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24 Aug 2020 21:23 #179279 by sokrates
Replied by sokrates on topic Raspberry Pi 4

If you’re looking for an advice to buy a good board I have more than 20 FPGA different boards and the best one for the price is this one :
a.aliexpress.com/_BThu9V
you can have 96i/o in 3.3v for only 15€
I can share with you a bitfile for this one, the slx25 cost 5 bucks more and works too...


Hi!

I'm interested in those bitfiles. :)

Also, a beginner question: Do you have the source code for those files? Is it VHDL? Or are they produced by some proprietary Xilinx software/configurator?

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20 Sep 2020 21:01 #182960 by Bari
Replied by Bari on topic Raspberry Pi 4
Should I make a LCNC SD card image with LCNC 2.8 already configured to run a DLP/LCD printer using the Rpi4? I'm not sure how simple this has to be made for hobbyists to be able to use it.
The following user(s) said Thank You: partec

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20 Sep 2020 22:53 - 21 Sep 2020 00:06 #182978 by partec
Replied by partec on topic Raspberry Pi 4
i think that would be fine

i have installed it with JT's

gnipsel.com/linuxcnc/uspace/rpi4-rt.html

my question remains how to manage GPIO configuration in detail?
Last edit: 21 Sep 2020 00:06 by partec.

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