第三章学习板固件代码 usb keyboard ; UsbMultimediaKeyboard ; UsbMouse
第八章学习板固件代码 usb disk
第九章学习板固件代码 MyUsbDevice
第二章学习板固件代码 TestBoard
是否运行了老版本的固件代码？
跨集群更新了固件之后，可以继续硬件的设置，因为有了最新的固件代码，很少会出现问题。
After you have updated the firmware across the cluster, you can continue hardware setup with the knowledge that fewer problems will arise later as a result of having the latest firmware code.
没想到30年后，作为嵌入式固件工程师，我还一直花费大量的时间试图将更多的代码和数据挤入较小的地址空间。
Little did I know 30 years later, as an embedded firmware engineer, I would still spend much of my time trying to squeeze more code and data into a smaller address space.
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