BluePill Plus CH32V203

Overview

The WeActStudio [1] BluePill Plus CH32V203 hardware provides support for QingKe V4B 32-bit RISC-V processor and the following devices:

  • CLOCK

  • GPIO

  • NVIC

  • UART

The board is equipped with two LEDs and three Buttons. User can use one of the LEDs and one of the buttons. The WCH webpage on CH32V203 [2] contains the processor’s manuals. The WeActStudio webpage on BPP [3] contains the BluePill’s schematic.

Hardware

The QingKe V4B 32-bit RISC-V processor of the BluePill Plus CH32V203 is clocked by an external 8 MHz crystal or the internal 8 MHz oscillator and runs up to 144 MHz. The CH32V203 SoC Features 2-4 USART, 4 GPIO ports, 1-2 SPI, 0-2 I2C, 9-16 ADC, RTC, CAN, USB Device, USB Host, OPA, and several timers.

Supported Features

The bluepillplus_ch32v203 board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

Connections and IOs

LED

  • LED0 = Blue User LED

Button

  • SW0 = User Button

Programming and Debugging

Applications for the bluepillplus_ch32v203 board can be built and flashed in the usual way (see Building an Application and Run an Application for more details); however, an external programmer is required since the board does not have any built-in debug support.

The following pins of the external programmer must be connected to the following pins on the PCB:

  • VCC = VCC

  • GND = GND

  • SWIO = PA13

  • SWCLK = PA14

Flashing

You can use minichlink to flash the board. Once minichlink has been set up, build and flash applications as usual (see Building an Application and Run an Application for more details).

Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b bluepillplus_ch32v203 samples/basic/blinky
west flash

Debugging

This board can be debugged via OpenOCD or minichlink.

References