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S1,S2,S3三个按键的作用是啥呀？
文档第5页上有说明。建议仔细查看板子的user guide，很多说明文档上都有。https://www.ti.com.cn/cn/lit/ug/spruis6/spruis6.pdf
S1,S2,S3三个按键的作用是啥呀？