CODEWITHSUNDEEP
c
Ah Îoon
Ah Îoon

Reputation: 51

How to interpret this bit shift?

I am reading something and I don't understand the meaning of the bit shift that stated below but I think it is basically programming question. I am reading a file and see this #define PIN_GEN (((uint32_t)1)<<31), but I don't quite understand the meaning of (((uint32_t)1)<<31). Could somebody tell me what is the meaning of this?

Upvotes: 2

Views: 65

Answers (1)

chux
chux

Reputation: 153478

((uint32_t)1)<<31 --> Make constant 1 of type uint32_t (32-bit unsigned with no padding) then shift left 31 places. Same as 

((uint32_t) 2147483648u)

The value is likely used as some sort of bit mask to indicate which bit to set.

Upvotes: 2

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