跑在 RVBoards D1 单板机上的 CPU 使用率指示器。读 /proc/stat 获取使用率数据，写 /sys/class/leds/sunxi_led0[rg]/brightness 点亮红灯或绿灯，以此指示 CPU 使用率。实现的语言包括但不限于C、C++、Python、Java。作为 RISC-V Linux 程序开发的 Demo 程序，比 Hello World 更好玩一点。
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