Re: [Emc-users] New board designed for CNC based on BeagleBone Black

[吳政昌 <ccw...@ma...>]

Hi Charles,

* Hardware encoder pins available:
  B12,eQEP0A_in
  C13,eQEP0B_in
  D13,eQEP0_index
  T12,eQEP2A_in
  R12,eQEP2B_in
  V13,eQEP2_index

* hostmot2 VHDL code
I have't heard of hostmot2 before. Thank you for mentioning it. From
linuxcnc's document the 7i43 supports 8-channel servo or 4-channel servo
plus 4 step/dir generator. I'm not that ambitious. I have had only 4
step/dir generators in my mind when I started to design the board.  I'm
planning to write the step/dir generators from scratch and connected it to
a j1 Forth CPU. Maybe I should go for a iCE40HX8K so there is more room for
VHDL.

I designed this board with an FPGA for following reasons:

1. Step/dir generator
2. SPI with many chip selectors
3. Signal processing which cannot be handle by CPU
4. Security: Users can protected their code using the nonvolatile memory in
iCE40

* PC/104 bus
OK, I should not mention PC/104, which could not be achieved with current
design ;). What I mean is daughter boards can stack under or above the
baseboard.

Thank you for your comments.




2014-06-24 21:26 GMT+08:00 Charles Steinkuehler <ch...@st...>:

> On 6/24/2014 5:47 AM, 吳政昌 wrote:
> > I'm designing a board for CNC based on Beaglebone Black.
> >
> > Spec: like BeagleBone Black but
> >   * 2 RJ45
> >   * 1 FPGA for stepper
> >   * Boot into EtherCAT master mode but can changed to EtherCAT slave mode
> >   * 2 Connectors, 1 of them is compatible to Raspberry Pi's P1 connector
>
> It sounds like a great board!  A few comments:
>
> * I recommend making the hardware encoder pins available if at all
> possible, since you seem to be targeting industrial control.
>
> * The PRU is required to run EtherCAT slave mode (along with the
> libraries from TI), which means the PRU likely will not be able to do
> step/dir generation in EtherCAT mode.  You have an FPGA, but I don't
> think the ICE40 will have enough logic to run the standard hostmot2 VHDL
> code.
>
> * I see mention of a PC104 bus, which would be great, but this would
> have to tie to the GPMC controller, which conflicts with the eMMC
> controller pins.
>
> --
> Charles Steinkuehler
> ch...@st...
>
>
>
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-- 
吳政昌 Sirius Wu
動程科技有限公司 Mapacode Inc.