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WCH CH32V307

The CH32V307 is a higher-end WCH microcontroller built around a 144MHz QingKe V4F RISC-V RV32IMAFC core (the full RV32I base plus the multiply, atomic, single-precision floating-point and compressed extensions, with a hardware FPU) with 256KB of flash and 64KB of SRAM. It carries GPIO ports, multiple USARTs, USB, Ethernet, timers, a SysTick counter and an ADC. It is the bigger sibling of the CH32V003, and here it runs real compiled firmware on a from-scratch RISC-V core.