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