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怎样用一个板子的开关控制另一个板子的LED?



老师给了个任务,用CC2540DK,用一个板子的开关控制另一个板子的LED,请问该如何入手···,连搜索都不知道怎样打关键字合适,完全没有思路·,是否可以给些简单的思路或者给些资料推荐???万谢!