cculpepper (u/cculpepper)

cculpepper commented on Data Runner Watch Prototype – Modded Casio F91W n-o-d-e.net/datarunner.ht... · Posted by u/pabloem

JackMcMack · 6 years ago

I built one of these, modified the firmware to show leap seconds: https://www.youtube.com/watch?v=tQaPtOPP09U

cculpepper · 6 years ago

I ended up making an "app" to do hundredths of seconds for TSD rallies. Awesome project. My build is 2-4 years old (IIRC), so it has some power issues, sometimes I'll catch it waking itself up more than usual, and I can hear the wakeups in the piezo which doesn't help.

cculpepper commented on Antique 4x5 camera creates 20 micron photolithography masks [video] youtube.com/watch?v=YAPt_... · Posted by u/EvanAnderson

cculpepper · 6 years ago

Ben's interview on The Amp Hour [0] is pretty great as well. Awesome person, amazingly the same in person as in his video persona.

[0] https://theamphour.com/480-an-interview-with-ben-krasnow-8-y...

cculpepper commented on Chris Lattner to Lead SiFive Platform Engineering Team sifive.com/blog/with-sifi... · Posted by u/pedrow

leggomylibro · 6 years ago

Yes, the Longan Nano is very nice but I'm also interested in the bare chips. Seeed also sells cheap JTAG dongles that work with their RISC-V boards, which is nice.

cculpepper · 6 years ago

I've been using a clone J-Link which works pretty good. I got it probably 5 years ago, so it's impressive that it works. I think I'm using a patched version of openocd with it though.

cculpepper commented on Chris Lattner to Lead SiFive Platform Engineering Team sifive.com/blog/with-sifi... · Posted by u/pedrow

leggomylibro · 6 years ago

Huh, what do you search for on Taobao to find them? I tried "GD32VF103CB" a week or two ago, but I only got results for the GD32F103 ARM clones.

I guess it makes sense that the addresses aren't quite the same; iirc ST has some licensing restrictions on their SVD/header files saying that you can't use them with other vendors' chips anyways.

Thanks for the extra information!

cculpepper · 6 years ago

Whoops, I meant TMall[0], its like aliexpress vs alibaba, or vice versa. Same buying process through a third party. Apologies for that.

[0]https://list.tmall.com/search_product.htm?q=gd32vf

cculpepper commented on Chris Lattner to Lead SiFive Platform Engineering Team sifive.com/blog/with-sifi... · Posted by u/pedrow

leggomylibro · 6 years ago

I can't wait to see more affordable RISC-V microcontrollers on the market!

The Kendryte K210 looked very cool, especially with its SIMD-ish "machine learning coprocessor", but it felt like they had rushed the hardware to market without investing in scrutable documentation or software support, last time I checked.

The GD32V series looks fantastic, since the current crop of GD32VF103 chips appear to be API-compatible with the venerable STM32F103 workhorse. But I haven't been able to find a source of the raw chips yet, it seems like you can only get them on development boards at the moment.

And there are always softcores running on FPGAs, but those sort of highlight how many permutations of "RISC-V" exist. I hope that we don't end up with too many inscrutable compiler flags to juggle as more of these chips become available.

cculpepper · 6 years ago

Not completely API-compatible. They are /extremely/ similar. Giga Devices did make an ARM STM32 clone, so they probably just did a ctrl-c, ctrl-p on the peripherals. Addresses are slightly different, and things aren't quite the same. I just ran into an issue with the system timer and it's lack of documentation... But good news is that they are pin-for-pin compatible, and you can put a raw chip onto a blue-pill board and use it!

You can get raw chips from taobao. I used taobao and a reseller, superbuy to get mine. Not bad at all!