4 ms·

32-bit RISC core with 64KB RAM (ECC would be nice) would seem more interesting? https://www.aliexpress.us/item/3256804164096177.html https://www.aliexpress.us/

32-bit RISC core with 64KB RAM (ECC would be nice) would seem more interesting? https://www.aliexpress.us/item/3256804164096177.html https://www.aliexpress.us/item/3256804164096177.html

metadat 4y ago
Why is that? What can you do there compared to this lil' guy?
- downvotetruth 4y ago
  https://en.wikipedia.org/wiki/64K_intro https://en.wikipedia.org/wiki/64K_intro & C64 code. Would assume compilers are able to "double" pack/vectorize 2 16 bit addresses into a 32 bit register, which would be the inverse of the 8 bit era of using 2 registers for 1 16 bit address.
  - metadat 4y ago
    Got it. Does this also imply the requirement of a display output?
    - downvotetruth 4y ago
      Display likely be remotable, but higher frequency & the vector extensions would be helpful.
eqvinox 4y ago
"Sorry, this item's currently unavailable in your location." (And no information on it at all, so no idea what you linked there…)
- downvotetruth 4y ago
  It's the least expensive CH32V307VCT6 development board I could find on aliexpress (no relation). Unfortunately, it looks like the WCH chip IP itself & its dev env (mounriver - eclipse based) used for debugging is closed with proprietary usb adapter & windows only.
  - eqvinox 4y ago
    Ah, Thanks, I actually looked at the chip earlier. The datasheet says it's programmed with "SWDIO" + "SWCLK" pins. Those names normally refer to ARM's SWD standard. If - and that's a big if - they actually implemented proper SWD, the lower layer protocols would be known and it might be possible to get OpenOCD to work to program the chip. (Debugging is a much harder question though…)
squarefoot 4y ago
Interesting, especially for USB host interface and Ethernet. Different applications however.
- SV_BubbleTime 4y ago
  These chips have neither USB nor Ethernet interfaces. They get to “$0.10” (not for you it won’t be) by trimming off the peripherals.
  - squarefoot 4y ago
    The data sheets says (page 2) the one linked by the parent has both, which makes that one super interesting. Of course I'd expect very different pricing, but still... (PDF) https://datasheet.lcsc.com/lcsc/2201121900_WCH-Jiangsu-Qin-Heng-CH32V307VCT6_C2943979.pdf https://datasheet.lcsc.com/lcsc/2201121900_WCH-Jiangsu-Qin-H...
amelius 4y ago
If you can read the datasheet ... https://datasheet.lcsc.com/lcsc/2205101630_WCH-Jiangsu-Qin-Heng-CH32V307RCT6_C2988083.pdf https://datasheet.lcsc.com/lcsc/2205101630_WCH-Jiangsu-Qin-H...

32-bit RISC core with 64KB RAM (ECC would be nice) would seem more interesting? https://www.aliexpress.us/item/3256804164096177.html https://www.aliexpress.us/item/3256804164096177.html

metadat 4y ago

Why is that? What can you do there compared to this lil' guy?

downvotetruth 4y ago
https://en.wikipedia.org/wiki/64K_intro https://en.wikipedia.org/wiki/64K_intro & C64 code. Would assume compilers are able to "double" pack/vectorize 2 16 bit addresses into a 32 bit register, which would be the inverse of the 8 bit era of using 2 registers for 1 16 bit address.
- metadat 4y ago
  Got it. Does this also imply the requirement of a display output?
  - downvotetruth 4y ago
    Display likely be remotable, but higher frequency & the vector extensions would be helpful.

eqvinox 4y ago

"Sorry, this item's currently unavailable in your location." (And no information on it at all, so no idea what you linked there…)

downvotetruth 4y ago
It's the least expensive CH32V307VCT6 development board I could find on aliexpress (no relation). Unfortunately, it looks like the WCH chip IP itself & its dev env (mounriver - eclipse based) used for debugging is closed with proprietary usb adapter & windows only.
- eqvinox 4y ago
  Ah, Thanks, I actually looked at the chip earlier. The datasheet says it's programmed with "SWDIO" + "SWCLK" pins. Those names normally refer to ARM's SWD standard. If - and that's a big if - they actually implemented proper SWD, the lower layer protocols would be known and it might be possible to get OpenOCD to work to program the chip. (Debugging is a much harder question though…)

squarefoot 4y ago

Interesting, especially for USB host interface and Ethernet. Different applications however.

SV_BubbleTime 4y ago
These chips have neither USB nor Ethernet interfaces. They get to “$0.10” (not for you it won’t be) by trimming off the peripherals.
- squarefoot 4y ago
  The data sheets says (page 2) the one linked by the parent has both, which makes that one super interesting. Of course I'd expect very different pricing, but still... (PDF) https://datasheet.lcsc.com/lcsc/2201121900_WCH-Jiangsu-Qin-Heng-CH32V307VCT6_C2943979.pdf https://datasheet.lcsc.com/lcsc/2201121900_WCH-Jiangsu-Qin-H...

amelius 4y ago

If you can read the datasheet ... https://datasheet.lcsc.com/lcsc/2205101630_WCH-Jiangsu-Qin-Heng-CH32V307RCT6_C2988083.pdf https://datasheet.lcsc.com/lcsc/2205101630_WCH-Jiangsu-Qin-H...