I saw the code
What is the significance of 0.5? Does 0.5 signify any midpoint?Code:typedef signed int SFRAC16; #define Q15(Float_Value) \ ((Float_Value < 0.0) ? (SFRAC16)(32768 * (Float_Value) - 0.5) \ : (SFRAC16)(32767 * (Float_Value) + 0.5))
I saw the code
What is the significance of 0.5? Does 0.5 signify any midpoint?Code:typedef signed int SFRAC16; #define Q15(Float_Value) \ ((Float_Value < 0.0) ? (SFRAC16)(32768 * (Float_Value) - 0.5) \ : (SFRAC16)(32767 * (Float_Value) + 0.5))
This code is a slightly questionable attempt at rounding into a 16 bit signed output. I say questionable because depending on "Float_Value", this could overflow.
The 0.5 is a means of 5/4 rounding of the result into an integer.
This also makes the assumption, it appears, that at singed int is 16 bits, but that's not guaranteed.
Last edited by Niccolo; 10-02-2019 at 11:32 AM.
