The Amp Hour Electronics Podcast

#637 – CH32V003…fun! with CNLohr

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Welcome to the show, CNLohr of the YouTube channel of the same name!

  • CNLohr has been working on projects and a library for the ch32v003, the $0.10 RISC V part
  • Dave has made a video about that part, using the official toolchain from MounRiver
  • How far will you take the chip?
  • Moving from knowing the arm instruction set to the RISC V instruction set
  • The benefits of knowing assembly
  • The CH32V003 is a RISC V part in the low end space made by WCH. CN thinks it’s about eqiuvalent to an AVR
  • You can buy a dev board on Tindie (this is the one Dave and Chris have)
  • Compiler tooling is done for you
  • AVR GCC
  • While discussing Espressif entering the market the way in which they did, CN said, “There’s only going to be one of these in all of computing”
  • Community reversing esp8266 using a virtual machine that had a leaked toolchain on it.
  • Compared to cc2500 / mediatek / realtek
  • ESP8266 without an RTOS “nonOS SDK“
  • lwip and wifi stack
  • Community port of FreeRTOS onto the ESP8266
  • CN worked on the “NoSDK 8266“
  • It didn’t have the WiFi enabled which meant timing wasn’t critical and he could overclock it to 380 MHz
  • Minecraft on a microscope slide
  • Ethernet on an AVR
  • Other people in this space
  • igor plug
  • lwusb is massive (relative to the space on the CH32V003)
  • What about the support burden of writing things yourself?
  • Chris made a comparision to college
  • USB on CH32v003
  • CNLohr already had hardware on hand for decoding and debugging the USB stack
  • He livestreamed the development!
  • Chris said he was not sure he could livestream, but CN said that the audience acts like rubber ducks and pair programming
  • ESPUSB
  • vusb on avr
  • Does communicty work like this have an influence on the market?
  • Padouk 3-8 cent micro
  • Grainuum library (later figured out it was written by past guest xobs!)
  • lufa / tinyusb
  • What are the physical requirements to implement USB without a transceiver? Only real thing is you need a pullup on the USB D- line
  • You also need to change pins from intput to output in the window of responding
  • Can make HID devices, but everything is low speed USB (1.5 Mbps)
  • CN built the Nixie tube controller
  • On GitHub there are examples on how to use various aspects of the part
  • The chip has DMA
  • During the chip shortages, CN was browsing lcsc and found a 10:1 transformer and wondered if he could make a flyback with it
  • Single wire debug
  • Check out the CH332V003fun library on github 
  • Getting started
  • The next few months CN will be working on getting everything to be really good for the library
  • There will also be support for other (larger, more expensive) parts
  • Join the Discord! (cnlohr)
  • Follow CNLohr on YouTube
    • ...more
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    The Amp Hour Electronics PodcastBy The Amp Hour (Chris Gammell and David L Jones)
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