mordae/pico-sdr
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Optimize biasing

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This commit is contained in:
Jan Hamal Dvořák 2024-02-20 12:03:06 +01:00
parent f22d77290f
commit c7980567c0
1 changed files with 1 additions and 13 deletions
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14
src/main.c
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@ -89,12 +89,10 @@ static void bias_init(int in_pin, int out_pin)
pio_sm_config pc = pio_get_default_sm_config();
sm_config_set_in_pins(&pc, in_pin);
sm_config_set_sideset(&pc, 2, false, true);
sm_config_set_sideset_pins(&pc, out_pin);
sm_config_set_out_pins(&pc, out_pin, 1);
sm_config_set_set_pins(&pc, out_pin, 1);
sm_config_set_wrap(&pc, 0, 0);
sm_config_set_clkdiv_int_frac(&pc, 1, 0);
sm_config_set_clkdiv_int_frac(&pc, 3, 127);
pio_sm_init(pio1, 0, 0, &pc);
pio_sm_set_consecutive_pindirs(pio1, 0, out_pin, 1, GPIO_OUT);
@ -304,13 +302,6 @@ static void rf_rx(void)
int I = mix(rx_buf + pos, lo_cos + pos, NUM_SAMPLES);
int Q = mix(rx_buf + pos, lo_sin + pos, NUM_SAMPLES);
/*
* Limit our biasing activity to a short period at a time.
* This is sufficient to keep the input biased while limiting
* the interference from biasing to minimum.
*/
pio_sm_exec(pio1, 0, pio_encode_sideset(2, 3) | pio_encode_nop());
/* Remove the large DC bias. */
I -= 16 * NUM_SAMPLES;
Q -= 16 * NUM_SAMPLES;
@ -326,9 +317,6 @@ static void rf_rx(void)
I /= NUM_SAMPLES;
Q /= NUM_SAMPLES;
/* Pause biasing. */
pio_sm_exec(pio1, 0, pio_encode_sideset(2, 2) | pio_encode_nop());
#if LPF_SAMPLES
lpIavg1 += I - lpIh1[lpIidx];
lpIh1[lpIidx] = I;