Attempt to improve the early version of s98.
Some more optimizations.
コンパイル済みファーム / Precompiled firmware:
https://github.com/Fujix1/NanoDrive-PRO/blob/master/firmware_v202.bin
ドライバ・転送用公式ツール / Official utilities for Longan Nano. Use "GD32_MCU_Dfu_Tool” to upload the firmware.
https://dl.sipeed.com/shareURL/others/Longan_nano/Nano/Tools