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GigaDevice GD32VF103

The GD32VF103 is a GigaDevice microcontroller built around a 108MHz Nuclei RISC-V RV32IMAC core (the RV32I base with integer multiply/divide, atomics and the compressed extension) with up to 128KB of flash and 32KB of SRAM. It carries GPIO ports, USARTs, SPI, I2C, timers and an ADC, and is best known as the processor on the Sipeed Longan Nano. Here it runs real compiled firmware on a from-scratch RISC-V core.