EMC2 running on Raspberry Pi?

Here's the youtube link to an actual test using the miniemc2 frontend:



Cheers!

FWIW, here is the screen grab of RPi running Axis over remote X:



Note that RPi is overclocked to 800 MHz.

The sshd load drops considerably if the preview is disabled, it goes down below 10%.

Hi Kinsa,

congratulations - great job!

Assuming this is based on miniemc2 - did you replicate Sergey's fast IRQ driver? I'd be rather curious about that because it could be a reasonable alternative for ARM boards which dont have something like the onboard PRU of the Beaglebone processor.

Will you publish the changes to miniemc2?

regards

Michael

mhaberler wrote:

Hi Kinsa,

congratulations - great job!

Assuming this is based on miniemc2 - did you replicate Sergey's fast IRQ driver? I'd be rather curious about that because it could be a reasonable alternative for ARM boards which dont have something like the onboard PRU of the Beaglebone processor.

Will you publish the changes to miniemc2?

regards

Michael

Thanks.

This is the rtos-integration-preview3 branch git code; this is all your work . The only addition I made is the hal spi driver for the PIC32 board. I will post the code once I am done with the cleanups.

Regarding miniemc2, I have only taken the web-interface and made it run on the latest code. It's a bit of a kludge, the author made some changes to shcom.cc, and I'm not sure if it is the "right" way of doing it.

Cheers!

This is the rtos-integration-preview3 branch git code; this is all your work . The only addition I made is the hal spi driver for the PIC32 board. I will post the code once I am done with the cleanups.

well, I'm very interested to see how you did that; if only to help others going for similar ventures.

Regarding miniemc2, I have only taken the web-interface and made it run on the latest code. It's a bit of a kludge, the author made some changes to shcom.cc, and I'm not sure if it is the "right" way of doing it.

I think linuxcnc would profit from becoming a tad more web-friendly, and if we have at least a branch, if not merged, with a way demonstrating how this can be done it would be of value to others.

regards,

Michael

I've asked for permission and got a reply from the author of miniemc2, so I'll post what I did on the wiki.

excellent!

- Michael

I have documented the PIC32 expnasion board here: code.google.com/p/picnc/

A simple HAL SPI driver for testing is included in the source page.

Kinsa,

kinsa wrote:

I have documented the PIC32 expnasion board here: code.google.com/p/picnc/

A simple HAL SPI driver for testing is included in the source page.

great - that looks quite solid

out of curiosity: do you have rough timings for the SPI communication? just to get a feel which delays we're looking at

- Michael

Transferring 64 bytes takes around 45us on a 15 MHz SPI clock. Note that the transfer happens both ways, i.e. the RPi is also receiving 64 bytes of data from the board at the same time.

The SPI clock can go up to 32 MHz. I haven't tested this as this is beyond the capability of the PIC32 chip. Maybe an FPGA board can handle it.