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CC2530的IO口可控制LED“亮”、“微亮”、“熄灭”吗?

RT,请问LED的“微亮”怎么用IO口控制?我试了把IO口调为“三态”,LED正极接0欧到3.3V正,LED负极接IO,LED无反应。LED的“微亮”用普通单片机的IO的“弱上拉”可以实现吗?还是“开漏输出”?‘