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omapl138 GPIO拉低问题



我将GP8[8]与GP8[15]做为输出管脚,为什么每次将管脚拉低后,低电平不能保持,瞬间又拉高了?

同样的做法在GP6[4]上就能正确拉低,低电平能保持!

请大家帮我分析下原因吧!谢谢