Getting Started with CH32V003

After watching David Jones's YouTube "EEVblog 1524 - The 10 CENT RISC V Processor! CH32V003",
https://www.youtube.com/watch?v=L9Wrv7nW-S8&ab_channel=EEVblog
I had to learn more about this chip.

The CH32V003 microcontroller

32-bit RISC-V core - 48MHz operating frequency
2KB SRAM
16KB program FLASH
System power supply: 3.3V or 5V
Factory-trimmed 24MHz RC oscillator (HSI)
DMA, ADC (8 external, 2 internal signals), 2 Timers, USART,
I2C, SPI, up to 18 GPIOs
The 20-pin CH32V003F4U6 is $0.15 in "onesie-twosie" quantities.
The 8-pin CH32V003J4M6 is available for $0.10.

Where to get a CH32V003 development board

I ordered five development kits (Dev board, LinkE programmer, USB cable) for $53.18 in April, 2023, from aliexpress.com.
I obtained another four kits from a coworker.  Sorry, this kit is no longer available.
Amazon will sell these development boards and LinkE boards for $10 (or more) each.
aliexpress.com will sell these development boards for $1.  The WCH-LinkE boards run $5.45.

My favorite development board includes a CH340 USB-Serial chip on-board. (I REALLY like this feature!)
https://www.amazon.com/CH32V003-Development-Minimum-Interface-fepart303799/dp/B0CSJYQ94L/ref=sr_1_3
I don't like the price the seller is asking.  Search AliExpress for better pricing...
https://www.aliexpress.us/item/3256805693233146.html

Repository for board with documentation and example code: https://github.com/wuxx/nanoCH32V003
The github repo's README.md file: https://github.com/wuxx/nanoCH32V003#readme
                  Schematic: https://github.com/wuxx/nanoCH32V003/blob/master/hardware/nanoCH32V003.pdf

I created a RISC-V folder under Documents like so:
C:\Users\Jim\Documents\RISC-V

While inside the RISC-V folder, I cloned the repository like so:
 git clone https://github.com/wuxx/nanoCH32V003.git

Inside the "doc" folder is the zipfile, CH32V003EVT.ZIP, with "EVT" folder inside.
Unzip the EVT folder into "doc", so you have the example code available.
This zip file was provided by WCH, providing examples for the CH32V003,
not specifically for the nanoCH32V003 board.

Github Examples: https://github.com/openwch/ch32v003/tree/main/EVT/EXAM

MounRiver Studio IDE

Download the latest version of MounRiver Studio IDE from the official website:
http://www.mounriver.com/  and install it.

More info concerning the board

According to the schematic, the LED is connected to PD6
If using the GPIO example project, need to change source code to use PD6, not PD0.

WCH-LinkE v1.0

After plugging in the WCH-Link USB-Serial programmer, the device should display in Window Device Manager

The programmer comes with a 4-conductor cable, wire colors: brown (1), red (2), orange (3), yellow (4)
I connected the LinkE programmer to the nanoCH32V003 target board as follows:
Target         LinkE
GND  - brown  - GND
DIO  - yellow - SWDIO
3V3  -  red   - 3V3

WCH-Link Utility

This software tool connects with the WCH-LinkE programmer, and allows the user to read, write, examine
program data written to the RISC-V device.
https://www.wch.cn/downloads/WCH-LinkUtility_ZIP.html

Notes & References

As noted in the YouTube EEVblog, the TSSOP20 package for this part appears to be pin
compatible with the STM8S003F3, https://www.st.com/resource/en/datasheet/stm8s003f3.pdf, at 1/3rd the price.
The UFQFPN20 package doesn't appear to be pin compatible.
Other websites for the CH32V003:
https://www.cnx-software.com/2023/02/22/ch32v003-risc-v-mcu-gets-1-5-development-board-open-source-gcc-toolchain-and-flasher-utility/
https://hackaday.com/2023/03/02/a-ch32v003-toolchain-if-you-can-get-one-to-try-it-on/
https://github.com/AlexanderMandera/arduino-wch32v003
https://www.tindie.com/products/adz1122/ch32v003-risc-v-mcu-development-board/
Example code provided by the processor manufacturer: http://www.wch.cn/downloads/CH32V003EVT_ZIP.html
https://www.wch.cn/downloads/file/409.html
guide: https://pallavaggarwal.in/2023/09/20/ch32v003-programming-guide/
guide: https://community.element14.com/technologies/embedded/b/blog/posts/low-cost-microcontrollers-using-a-ch32v003-risc-v-device
I2C Assembly Example: https://github.com/IanWraith/CH32V003-RISC-V-Assembly-Examples/blob/main/i2c.s

I2C Example using AT24C256 EEPROM - Link:
https://pallavaggarwal.in/2023/10/05/ch32v003-programming-i2c-eeprom/

My CH32V003 Projects

Currently storing my CH32V003 projects on github:
1us Timer : https://github.com/JimMerkle/CH32V003_Timer_1us
command_line: https://github.com/JimMerkle/CH32V003_command_line
I2C Read/Write w DS3231: https://github.com/JimMerkle/CH32V003_I2C_7bit