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Understanding these three operations will make your life much easier.

Setting a Bit

The bitwise OR operator is used to set a bit. The following code snippet sets bit x.

extern uint8_t value;
value |= 1 << x;

Note: Using the |= assignment operator

value |= 1 << x;

is essentially the same as doing

value = value | (1 << x);

Example

Suppose we have the following value

...

extern uint8_t value;
value &= ~(1 << x);

Note: Using the &= assignment operator

value &= ~(1 << x);

is essentially the same as doing

value = value & ~(1 << x);

Example

Suppose we have the following value 

...

extern uint8_t value;
value ^= 1 << x;

Note: Using the ^= assignment operator

value ^= 1 << x;

is essentially the same as doing

value = value ^ (1 << x);

Example

Suppose we have the following value

...

(0b00010111 >> 2) = 0b000000010b00000101

Then, the AND operator is applied

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