helix serial.c: add some comment
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/*
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/*
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* WARNING: be careful changing this code, it is very timing dependent
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* WARNING: be careful changing this code, it is very timing dependent
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*
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* 2018-10-28 checked
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* avr-gcc 4.9.2
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* avr-gcc 5.4.0
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* avr-gcc 7.3.0
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*/
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*/
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#ifndef F_CPU
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#ifndef F_CPU
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