mordae/pico-sdr
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Remove DC bias

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This commit is contained in:
Jan Hamal Dvořák 2024-02-23 11:19:28 +01:00
parent 07c2ca1cae
commit e92587b522
1 changed files with 8 additions and 0 deletions
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8
src/main.c
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@ -538,6 +538,8 @@ static void rf_rx(void)
uint32_t prev_transfers = dma_hw->ch[dma_ch_in_cos].transfer_count;
unsigned pos = 0;
int dcI = 0, dcQ = 0;
while (true) {
if (multicore_fifo_rvalid()) {
multicore_fifo_pop_blocking();
@ -571,6 +573,12 @@ static void rf_rx(void)
int I = cos_neg - cos_pos;
int Q = sin_neg - sin_pos;
dcI = (dcI * 255 + I * 256) >> 8;
dcQ = (dcQ * 255 + Q * 256) >> 8;
I -= dcI >> 8;
Q -= dcQ >> 8;
*blockptr++ = I;
*blockptr++ = Q;
}