Weaker biasing has better SNR
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@ -103,6 +103,9 @@ static void bias_init(int in_pin, int out_pin)
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const uint16_t insn[] = {
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pio_encode_mov_not(pio_pins, pio_pins) | pio_encode_sideset(1, 1),
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pio_encode_nop() | pio_encode_sideset(1, 0) | pio_encode_delay(15),
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pio_encode_nop() | pio_encode_sideset(1, 0) | pio_encode_delay(15),
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pio_encode_nop() | pio_encode_sideset(1, 0) | pio_encode_delay(15),
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};
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pio_program_t prog = {
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