TonyMac32

Relatively random topic, however who here has one/uses one? I just picked up a Sain Smart Genmitsu Pro, 3018 size. I actually got it working with my NanoPi K2 first, because why not? And bCNC seems like quite a nice program, I assume when I move this to my shop it will be sporting a 7" touchscreen and a stable board.

I have the esp32 and the 8266 based ones, I havent gotten too far experimenting with them. Sent from my Pixel using Tapatalk

@sgjava so the SPI is not defined in the device tree on C1, but is probed later? I'll perhaps look at that. No problem on working on this, these boards are supposed to push RPi compatability, so SPI would be an assumed function IMHO. And maybe I have use for SPI as well, having a thing for ADC's...

OK, got K2 to cooperate as well, however apparently defining spidev in DT is frowned upon, there is a dmesg warning gripe about it. Used SigRock Pulseview to investigate the quality of the sclk timing and... probably ought to stick to 500kHz, even if you might be able to push more. The clock jitter is noticable.

@sgjava Excellent, done. I'll work on getting it onto the other Meson64 boards as well.

I pulled them out of the source code for the hardkernel 3.14. they align with the spi pins on RPI afaik.

It wasn't an issue on 4.14 for quite some time either Sent from my Pixel using Tapatalk

There's been a lot of mess around dwc2/dwc3 in general. Sent from my Pixel using Tapatalk

I have seen them not recognize devices if they weren't plugged in on boot, but I haven't gotten into it uet Sent from my Pixel using Tapatalk

Now I have to figure out what I did wrong on the K2...

Yep, that will do it.

@sgjava OK, try out http://electricgraveyard.com/armbian/C2/SPI/ I included the header package in case needed.

I'll try to get it built after bit, I get off of work in a few hours

I can build a kernel and give you a link, or if you can build it yourself, I could send you the proposed code snippet to inject into the dts

My first crude attempt on the K2 didn't work, but again, different gpio's involved and the bindings have changed somewhat since kernel 3.14. I can build a C2 kernel and we can see if it works for you. I also see a frequency limit of 500 khz, so keep that in mind. It might not be a "real" limit, some testing would be useful to determine. Sent from my Pixel using Tapatalk

@sgjava the mainline device tree doesn't have the spi nodes the 3.14 had: https://github.com/hardkernel/linux/blob/odroidc2-3.14.y/arch/arm64/boot/dts/meson64_odroidc2.dts#L802 That looks like generic GPIO SPI, and I haven't found, in the last 20 minutes or so, where the spicc and spifc pops out of the processor GPIO wise. It does not appear to be GPIOX, so I think on the C2 the setup has to be a software SPI. NanoPi K2 appears to be in the same position, just plain not having SPI. I will investigate adding it to K2, then someone with a C2 can try it.

Yeah, I tried it on my K2, same result. Let me look at the build

"meson" is the name of the amlogic processors, I'd put my money on that one given the other choices.

The armbianmonitor -m output demonstrated this wasn't a proper Armbian image, his cpufreq was dropping down to 200-ish MHz. We are set to minimum 600, as otherwise there is too much latency for no power savings

On the M4 at least they are showing RT9724GQW as a current limiter for the individual ports, which has about 111 mili-ohms resistance at 5V, and the FET to enable the 5V for that appears to be under 41 mili-ohms, so I'm not sure what would be knocking it out unless the RTL8153 is unbelievably power hungry.

It doesn't power via USB-C, so should not be an issue.

#ThanksRockchip

@sgjava Obviously comes here sometimes, I don't have a C2 to try it on, and haven't used it in general, but looks interesting. Perhaps I'll try it on my K2, but it's running 4.14 at the moment.

Rockchip devices also support flashing via USB, if the OTG is exposed. https://www.cnx-software.com/2018/07/10/rkdeveloptool-flash-linux-firmware-rockhip/

I don't think continuing a 30+ year trend of using proprietary connections/hardware solutions is any indication of USB-C.