[todo] how to write driver

1. got know what the whole system is what, its function, do what

2. HW: include which hardware

3. SW: which software

4. SW+HW: how software and hardware co-work, contain which levels/layers

5. current system is what, it has contains which layer

6. the hardware-specific details, is what you should implement. And/or the upper layer application/demo, you should implement.

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