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README.md

FreeRTOS demo for WCH CH32V30x series MCU

How to use

Write your own CMake toolchain file (see riscv64-elf.cmake for example)
Configure project and build as usual. (see below for a simple test)

Sample usage

mkdir build && cd build
cmake -DCMAKE_TOOLCHAIN_FILE=riscv64-elf.cmake ..
make -j${nprocs}

Notes

Startup files

There are two versions of startup assembly files, located at

BSP/Startup/startup_ch32v30x_D8.S
BSP/Startup/startup_ch32v30x_D8C.S

The first file is used for CH32V303 devices, which lacks of the following peripherals:

Ethernet
CAN2
USBHS
DVP

*** Change the startup file to the correct version for the hardware in use. ***

Compilers

These MCUs uses something called "RISC-V4F" core with Chinese documentation provided:

Implemented RV32IMAFC ABI

Here is the list of features proprietary or incompatible with upstream toolchain:

Fast IRQ handlers: uses a special attribute of interrupt, which value is WCH-Interrupt-fast