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Use ITM, How is the input char saved into ITM_RxBuffer?

Zhang Rex

I'm learning for the code in \Keil\ARM\Examples\Measure, I can input/output debug information though ITM and Debug(printf) Viewer normally.
When I review the source code, I found a input char is saved into ITM_RxBuffer automatically.
Either I change the variable name "ITM_RxBuffer" or I change the magic number ITM_RXBUFFER_EMPTY value(from 0x5AA55AA5 to any other value), it cannot work normally.
Why? If KEIL tool-chain do something implicitly?

Great thanks for any response.

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