Porting FreeRTOS to WCH CH32V307, It seems WCH has some serious issue about their RISC-V MCUs...

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RISC-V supports vectored and non-vectored exception handling, defined in a CSR called mtvec. The default handling mode is done by rewriting PC to vectored or non-vectored address defined in BASE.
However, WCH somehow decided that everything "Reserved" by specification can be used, so they simply added a third exception handling method in MODE field, something called "NVIC" by ARM...

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