Q-format macros

group Q-Format Conversion Macros

Defines

F(N)

Convert fixed-point value to double-precision float.

This macro is meant to allow for parameterized access to the more specific conversion macros, such as F8(), F24(), F31() and so on. Being parameterized allows the user to specify the Q-format (fractional bit count) using another macro. For example:

#define X_FRAC_BITS   24
int32_t x = ...;
...
// Convert x to double
double dbl_x = F(X_FRAC_BITS)(x);

Q(N)

Convert floating-point value to fixed-point value.

This macro is meant to allow for parameterized access to the more specific conversion macros, such as Q8(), Q24(), Q31() and so on. Being parameterized allows the user to specify the Q-format (fractional bit count) using another macro. For example:

#include <math.h>
...
#define PI_FRAC_BITS   24
int32_t x = Q(PI_FRAC_BITS)(M_PI);

Q31(f)

Convert double value to Q1.31 fixed-point value, with rounding.

Q30(f)

Convert double value to Q2.30 fixed-point value, with rounding.

Q29(f)

Convert double value to Q3.29 fixed-point value, with rounding.

Q28(f)

Convert double value to Q4.28 fixed-point value, with rounding.

Q27(f)

Convert double value to Q5.27 fixed-point value, with rounding.

Q26(f)

Convert double value to Q6.26 fixed-point value, with rounding.

Q25(f)

Convert double value to Q7.25 fixed-point value, with rounding.

Q24(f)

Convert double value to Q8.24 fixed-point value, with rounding.

Q23(f)

Convert double value to Q9.23 fixed-point value, with rounding.

Q22(f)

Convert double value to Q10.22 fixed-point value, with rounding.

Q21(f)

Convert double value to Q11.21 fixed-point value, with rounding.

Q20(f)

Convert double value to Q12.20 fixed-point value, with rounding.

Q19(f)

Convert double value to Q13.19 fixed-point value, with rounding.

Q18(f)

Convert double value to Q14.18 fixed-point value, with rounding.

Q17(f)

Convert double value to Q15.17 fixed-point value, with rounding.

Q16(f)

Convert double value to Q16.16 fixed-point value, with rounding.

Q15(f)

Convert double value to Q17.15 fixed-point value, with rounding.

Q14(f)

Convert double value to Q18.14 fixed-point value, with rounding.

Q13(f)

Convert double value to Q19.13 fixed-point value, with rounding.

Q12(f)

Convert double value to Q20.12 fixed-point value, with rounding.

Q11(f)

Convert double value to Q21.11 fixed-point value, with rounding.

Q10(f)

Convert double value to Q22.10 fixed-point value, with rounding.

Q9(f)

Convert double value to Q23.9 fixed-point value, with rounding.

Q8(f)

Convert double value to Q24.8 fixed-point value, with rounding.

F31(x)

Convert Q1.31 fixed-point value to double value.

F30(x)

Convert Q2.30 fixed-point value to double value.

F29(x)

Convert Q3.29 fixed-point value to double value.

F28(x)

Convert Q4.28 fixed-point value to double value.

F27(x)

Convert Q5.27 fixed-point value to double value.

F26(x)

Convert Q6.26 fixed-point value to double value.

F25(x)

Convert Q7.25 fixed-point value to double value.

F24(x)

Convert Q8.24 fixed-point value to double value.

F23(x)

Convert Q9.23 fixed-point value to double value.

F22(x)

Convert Q10.22 fixed-point value to double value.

F21(x)

Convert Q11.21 fixed-point value to double value.

F20(x)

Convert Q12.20 fixed-point value to double value.

F19(x)

Convert Q13.19 fixed-point value to double value.

F18(x)

Convert Q14.18 fixed-point value to double value.

F17(x)

Convert Q15.17 fixed-point value to double value.

F16(x)

Convert Q16.16 fixed-point value to double value.

F15(x)

Convert Q17.15 fixed-point value to double value.

F14(x)

Convert Q18.14 fixed-point value to double value.

F13(x)

Convert Q19.13 fixed-point value to double value.

F12(x)

Convert Q20.12 fixed-point value to double value.

F11(x)

Convert Q21.11 fixed-point value to double value.

F10(x)

Convert Q22.10 fixed-point value to double value.

F9(x)

Convert Q23.9 fixed-point value to double value.

F8(x)

Convert Q24.8 fixed-point value to double value.