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如何控制 AM437X_GP_EVM 开发板上的LED灯?



如题,按照一些书上的指导(书上的是AM335x的开发板),在开发板的 /sys/class/leds目录下应该有四个led设备,但是却没有。那如何使用 AM437X_GP_EVM开发板的led灯呢?