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Extract some constexpr math utilities to utility.hpp

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...my dumping ground for so many random bits.
This commit is contained in:
Jared Boone 2016-02-10 10:15:42 -08:00
parent 096e961c67
commit dfbcf5bc75
2 changed files with 9 additions and 8 deletions
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9
firmware/common/dsp_fft.hpp
View File

@ -32,6 +32,7 @@
#include "dsp_types.hpp"
#include "complex.hpp"
#include "hal.h"
#include "utility.hpp"
namespace std {
/* https://github.com/AE9RB/fftbench/blob/master/cxlr.hpp
@ -47,14 +48,6 @@ namespace std {
}
} /* namespace std */
constexpr bool power_of_two(const size_t n) {
return (n & (n - 1)) == 0;
}
constexpr size_t log_2(const size_t n, const size_t p = 0) {
return (n <= 1) ? p : log_2(n / 2, p + 1);
}
template<typename T, size_t N>
void fft_swap(const buffer_c16_t src, std::array<T, N>& dst) {
static_assert(power_of_two(N), "only defined for N == power of two");

8
firmware/common/utility.hpp
View File

@ -61,6 +61,14 @@ inline constexpr T pow(const T base, unsigned const exponent) {
return (exponent == 0) ? 1 : (base * pow(base, exponent - 1));
}
constexpr bool power_of_two(const size_t n) {
return (n & (n - 1)) == 0;
}
constexpr size_t log_2(const size_t n, const size_t p = 0) {
return (n <= 1) ? p : log_2(n / 2, p + 1);
}
float complex16_mag_squared_to_dbv_norm(const float c16_mag_squared);
inline float magnitude_squared(const std::complex<float> c) {