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c++ - How shiftOut function works internally? (explanation on source code) - Arduino Stack Exchange

https://arduino.stackexchange.com/questions/12285/how-shiftout-function-works-internally-explanation-on-source-code

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by Edgar Bonet ‧ Arduino Stack Exchange ‧ saved copy from 2026.03.02

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I were examining shiftOut() function code in wiring_shift.c and I didn’t quite understand what is going in digitalWrite function. I see !!(val & (1 << i)) is taking the bit value from val…
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