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fix: fft function type

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This commit is contained in:
liuyihui 2023-04-25 19:09:55 +08:00
parent 724eb658e7
commit c1d0166c44
2 changed files with 2 additions and 4 deletions
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2
include/fft/fft.h
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@ -8,4 +8,4 @@
#define FFT_BIN(num, re) (uint16_t)((float)(num + 0.5) * re)
#define FFT_INDEX(freq, re) (uint16_t)((float)freq / re)
int FFT(q15_t *data);
void FFT(q15_t *data);

4
src/fft/fft.c
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@ -84,7 +84,7 @@ static inline void butterfly(q15_t *data) {
}
}
int FFT(q15_t *data) {
void FFT(q15_t *data) {
for (uint16_t i = 0; i < N; i++) {
res[Re(i)] = data[i]; // real
res[Im(i)] = 0; // imaginary
@ -93,6 +93,4 @@ int FFT(q15_t *data) {
butterfly(res);
bitreversal((q31_t *)res);
for (uint16_t i = 0; i < N; i++) data[i] = (q15_t)abs(res[Re(i)]);
return 0;
}