项目所需，在主循环中循环读取某管脚电平，在初始化中使用
GPIODirModeSet(GPIO_PIN_16,GPIO_DIR_MODE_IN);
来设置输入，在主循环使用
pin = GPIOPinRead(GPIO_PIN_16);来读取
现在发现pin值无论接高电位或者低电位，都是0。请大大神们帮我分析一下，是我的代码缺少了什么步骤吗？
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