RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ f28b84aa1fbe683cf52caaffbe7de76a8565bfb3

sheltonyu d1c7712bfb [bsp/at32] 1.add support hwi2c driver, 2.update all firmware libraries. (#9241)		1 vuosi sitten
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cmsis	d1c7712bfb [bsp/at32] 1.add support hwi2c driver, 2.update all firmware libraries. (#9241)	1 vuosi sitten
drivers	d1c7712bfb [bsp/at32] 1.add support hwi2c driver, 2.update all firmware libraries. (#9241)	1 vuosi sitten
SConscript	d466bd0540 [bsp/at32] 1、调整文件结构，合并各系列独立的rt-drivers，以便维护。 2、更新各系列library和工程相关内容	3 vuotta sitten