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WCH CH32V003

The CH32V003 is a WCH microcontroller built around a 48MHz QingKe RISC-V RV32EC core (the RV32E embedded base cut down to 16 registers, plus the compressed extension, with no hardware multiply) with 16KB of flash and 2KB of SRAM. It carries GPIO ports, a USART, timers, a SysTick counter and an ADC in a tiny package. It is famous as the roughly ten-cent RISC-V microcontroller, and here it runs real compiled firmware on a from-scratch RISC-V core.