Create a FPGA board for raspberry

Boaschti
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04 Dec 2021 11:24 #228341 by Boaschti

Create a FPGA board for raspberry was created by Boaschti

Hello, i plan to create a custom I/O like the mesa 7c80. My problem is that mesa cards are not available at this time and i need relais on board.
We have much experience with electronics.
Now i have seen the post from gtt38 Link with a running fpga eval board and a raspberry.
My questions are:
Are there any layouts available with a fpga and raspberry?
When using the fpga board Link :
Are there any more informations about using universal FPGA Boards?
Do i need any modifikations in hostmot2 firmware?
Do i need any modifikations on the eval board?
Are there any showbreakers which i don't know yet (like closed sources or unknown code or fpga firmware modifications)? (Except normal showbreakers with electronic components...)

Best regards.

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Henk
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04 Dec 2021 15:18 #228346 by Henk

Replied by Henk on topic Create a FPGA board for raspberry

This came up recently. Looks interesting.

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Bari
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15 Dec 2021 05:53 #229097 by Bari

Replied by Bari on topic Create a FPGA board for raspberry

forum.linuxcnc.org/27-driver-boards/44422-colorcnc

"ColorCNC" because it's a firmware driver for Chinese board Colorlight 5A-75B

www.colorlightinside.com/Products/i%20Re...ng-series/34_25.html

Sells for ~$15

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Boaschti
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19 Jan 2022 20:06 - 19 Jan 2022 20:11 #232477 by Boaschti

Replied by Boaschti on topic Create a FPGA board for raspberry

Is it possible to make a custom .bit File with following IO pinout. Of course without having trouble with FPGA stability.
The basic pinout is form 7c80 board and i need some extensions.

Configuration pin-out:

IO Connections for StepGens+Misc
Pin#  I/O   Pri. func    Sec. func       Chan      Pin func        Pin Dir

 0      0   IOPort       StepGen          0        Step/Table1     (Out)
 0      1   IOPort       StepGen          0        Dir/Table2      (Out)
 0      2   IOPort       StepGen          1        Step/Table1     (Out)
 0      3   IOPort       StepGen          1        Dir/Table2      (Out)
 0      4   IOPort       StepGen          2        Step/Table1     (Out)
 0      5   IOPort       StepGen          2        Dir/Table2      (Out)
 0      6   IOPort       StepGen          3        Step/Table1     (Out)
 0      7   IOPort       StepGen          3        Dir/Table2      (Out)
 0      8   IOPort       StepGen          4        Step/Table1     (Out)
 0      9   IOPort       StepGen          4        Dir/Table2      (Out)
 0     10   IOPort       StepGen          5        Step/Table1     (Out)
 0     11   IOPort       StepGen          5        Dir/Table2      (Out)
 0     12   IOPort       SSerial          0        RXData0         (In)
 0     13   IOPort       SSerial          0        TXData0         (Out)
 0     14   IOPort       SSerial          0        TXEn0           (Out)
 0     15   IOPort       QCount           0        Quad-A          (In)
 0     16   IOPort       QCount           0        Quad-B          (In)
 0     17   IOPort       QCount           0        Quad-IDX        (In)
 0     18   IOPort       PWM              0        PWM             (Out)
 0     19   IOPort       PWM              0        /Enable         (Out)
 0     20   IOPort       None           
 0     21   IOPort       None           
 0     22   IOPort       InMux            0        Addr0           (Out)
 0     23   IOPort       InMux            0        Addr1           (Out)
 0     24   IOPort       InMux            0        Addr2           (Out)
 0     25   IOPort       InMux            0        Addr3           (Out)
 0     26   IOPort       InMux            0        Addr4           (Out)

IO Connections for Outputs+P1
Pin#  I/O   Pri. func    Sec. func       Chan      Pin func        Pin Dir

 0     27   IOPort       InMux            0        Data0           (In)
 0     28   IOPort       SSR              0        Out-00          (Out)
 0     29   IOPort       SSR              0        Out-01          (Out)
 0     30   IOPort       SSR              0        Out-02          (Out)
 0     31   IOPort       SSR              0        Out-03          (Out)
 0     32   IOPort       SSR              0        Out-04          (Out)
 0     33   IOPort       SSR              0        Out-05          (Out)
 0     34   IOPort       SSR              0        Out-06          (Out)
 0     35   IOPort       SSR              0        Out-07          (Out)
 0     36   IOPort       SSR              0        AC Ref          (Out)
 0     37   IOPort       PWM              1        PWM             (Out)           
 0     38   IOPort       QCount           1        Quad-A          (In)           
 0     39   IOPort       QCount           1        Quad-B          (In)           
 0     40   IOPort       QCount           1        Quad-IDX        (In)           
 0     41   IOPort       None
 0     42   IOPort       None
 0     43   IOPort       SSerial          0        RXData2         (In)
 0     44   IOPort       SSerial          0        TXData2         (Out)
 0     45   IOPort       SSerial          0        RXData1         (In)
 0     46   IOPort       SSerial          0        TXData1         (Out)
 0     47   IOPort       None
 0     48   IOPort       QCount           2        Quad-A          (In)
 0     49   IOPort       QCount           2        Quad-B          (In)
 0     50   IOPort       QCount           2        Quad-IDX        (In)
 0     51   IOPort       QCount           3        Quad-A          (In)
 0     52   IOPort       QCount           3        Quad-B          (In)
 0     53   IOPort       QCount           3        Quad-IDX        (In)

See attachment for

Last edit: 19 Jan 2022 20:11 by Boaschti.

The following user(s) said Thank You: besriworld

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PCW
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19 Jan 2022 22:28 - 19 Jan 2022 22:30 #232488 by PCW

Replied by PCW on topic Create a FPGA board for raspberry

A custom bitfile needs at least

The FPGA pinout (which pin goes to which GPIO bit/interface bit etc)

The I/O pinout (Which GPIO bit has which secondary function)

Note that you probably don't want to to use SSR modules unless you are using transformer isolation

Last edit: 19 Jan 2022 22:30 by PCW.

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Boaschti
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20 Jan 2022 08:42 #232501 by Boaschti

Replied by Boaschti on topic Create a FPGA board for raspberry

I want to use the fpga pinout from the 7c80.
What i have to use instead of ssr funktionality? I need simple outputs for air, water, vacuum, ligths, spindle (kress/amb).

What is the exactly funktionality of IO19...PWM.../ENABLE? Is it used to controll enable input of steppers/servos or is it used to disable pwmoutputs?

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D.L.
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20 Jan 2022 11:50 #232513 by D.L.

Replied by D.L. on topic Create a FPGA board for raspberry

No sense to use multiplexers for expand inputs, xc6slx9 in spi hostmot2 configuration support up to 85 gpio pins(for example: 4 port x 21 pin or 5 port x 17 pin).

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Boaschti
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20 Jan 2022 18:58 - 20 Jan 2022 19:10 #232545 by Boaschti

Replied by Boaschti on topic Create a FPGA board for raspberry

Ok. Thats a interesting info.
My idea was to design the hardware very similar to the 7c80 board (IO0..IO36). There is already a bitfile for this and as a linuxcnc beginner I have fewer sources of error. So I can start more easy.
In future i want to have a bitfile for IO00..IO53. My machine doesn't has a encoder at this moment but it is planed.

But if I have to make a bitfile because of the ssr functionality then I can also remove the multiplexer.

Last edit: 20 Jan 2022 19:10 by Boaschti.

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D.L.
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20 Jan 2022 19:23 #232548 by D.L.

Replied by D.L. on topic Create a FPGA board for raspberry

Before loading the firmware - all pins in high impedance state.
After loading the firmware - all pins in gpio mode.
After loading the LinuxCNC, pins may be switching to the secondary function - it defined in hal/ini config string.
If in config string defined num_ssrs=0, all ssr pins in gpio mode.

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Boaschti
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13 Feb 2022 12:40 #234691 by Boaschti

Replied by Boaschti on topic Create a FPGA board for raspberry

Where i have to add num_ssrs=0. If I add it into .hal there is a error "unknown command".

First tests looks good!

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Create a FPGA board for raspberry

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