Let us say that byte1 = 00001111, and byte2 = 11110000. How would I take the second half of byte1, then take the first half of byte2 and combine them to get one byte of value 11111111. I have done some research, but I just cannot seem to wrap my head around bitmasks and shifting.
How to combine two halves from two bytes to get a single byte
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If it's guaranteed that the "spare" bits are all zeroes, you can just
ORtogether the two bytes, sinceA or 0 == A(see below)If that's not guaranteed, you need
(byte1 AND 0x0f) OR (byte2 AND 0xf0).The
ANDoperations set the unwanted bits to zero (sinceA AND 0 == 0) and then theORoperation combines the bytes, as above.and then
No bit shifts are required because the bits you want to keep are already in the correct bit positions.