Function that toggle LED on and off

 

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  • How do you set, clear, and toggle a single bit? 26 answers

    • Certainly. What you want is to perform a logical XOR with 00000001 (this is called a mask): 

    MASK          INPUT     OUTPUT
00000001 XOR 00000000 = 00000001
00000001 XOR 00000001 = 00000000

    This also makes it possible to toggle more than one bit, eg, if your mask were 00001001 : 

    MASK          INPUT     OUTPUT
00001001 XOR 00000000 = 00001001
00001001 XOR 00001001 = 00000000
00001001 XOR 00001000 = 00000001
00001001 XOR 00000001 = 00001000
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