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Little FFT loop indexing tweak.

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This commit is contained in:
Jared Boone 2016-01-03 17:47:08 -08:00
parent 78992c2f8d
commit 65dd385c94
1 changed files with 2 additions and 1 deletions
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3
firmware/common/dsp_fft.hpp
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@ -112,7 +112,8 @@ void fft_c_preswapped(std::array<T, N>& data) {
static_assert(power_of_two(N), "only defined for N == power of two"); static_assert(power_of_two(N), "only defined for N == power of two");
/* Provide data to this function, pre-swapped. */ /* Provide data to this function, pre-swapped. */
for(size_t mmax = 1; N > mmax; mmax <<= 1) { for(size_t k = 0; k < log_2(N); k++) {
const size_t mmax = 1 << k;
const float theta = -pi / mmax; const float theta = -pi / mmax;
const float wtemp = sin_f32(0.5f * theta); const float wtemp = sin_f32(0.5f * theta);
const T wp { const T wp {