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st 3hall 不是很好吗, 我和他的方法一样的。(外置异或门 ,hall 当前角度 + 偏移角度) fast 低速度很差呀,我都是 15hz 才切换到 fast 的。2806x 价格太贵了,没有竞争力,想用28034 替代 2806x