RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ d5b20ba603ae674e1f2f34226b555b0d8702a6bf

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bernard.xiong c05af1b737 update dc and window demo.		16 lat temu
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file	bbd9f470f0 add file read speed test.	16 lat temu
gui	c05af1b737 update dc and window demo.	16 lat temu