mordae/pico-sdr
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Optimize mixer using XOR

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Signed-off-by: Jan Hamal Dvořák <mordae@anilinux.org>
This commit is contained in:
Jan Hamal Dvořák 2024-01-27 12:57:19 +01:00
parent 8ca3a3d2bf
commit d19d4ebc87
1 changed files with 5 additions and 2 deletions
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src/main.c
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@ -486,8 +486,8 @@ static void rf_rx(void)
pos = (pos + 1) & (LO_WORDS - 1); pos = (pos + 1) & (LO_WORDS - 1);
#if SPEED == 3 #if SPEED == 3
I += popcount(rx_word & cos_word) - popcount(rx_word & ~cos_word); I += popcount(rx_word ^ cos_word);
Q += popcount(rx_word & sin_word) - popcount(rx_word & ~sin_word); Q += popcount(rx_word ^ sin_word);
#elif SPEED == 2 #elif SPEED == 2
interp0->accum[0] = rx_word; interp0->accum[0] = rx_word;
interp0->accum[1] = rx_word; interp0->accum[1] = rx_word;
@ -546,6 +546,9 @@ static void rf_rx(void)
#endif #endif
} }
I -= 16 * NUM_SAMPLES;
Q -= 16 * NUM_SAMPLES;
#if EXTRA_BITS #if EXTRA_BITS
I <<= EXTRA_BITS; I <<= EXTRA_BITS;
Q <<= EXTRA_BITS; Q <<= EXTRA_BITS;