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lockin-internal: rotate samples

This commit is contained in:
Robert Jördens 2021-02-01 19:31:57 +01:00
parent 08cc2e4840
commit 24a4486847
1 changed files with 2 additions and 2 deletions
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4
src/bin/lockin-internal.rs
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@ -12,7 +12,7 @@ use stabilizer::{hardware, SAMPLE_BUFFER_SIZE, SAMPLE_BUFFER_SIZE_LOG2};
const ONE: i16 = (0.1 * u16::MAX as f32) as _; const ONE: i16 = (0.1 * u16::MAX as f32) as _;
const SQRT2: i16 = (ONE as f32 * 0.707) as _; const SQRT2: i16 = (ONE as f32 * 0.707) as _;
const DAC_SEQUENCE: [i16; SAMPLE_BUFFER_SIZE] = const DAC_SEQUENCE: [i16; SAMPLE_BUFFER_SIZE] =
[0, SQRT2, ONE, SQRT2, 0, -SQRT2, -ONE, -SQRT2]; // TODO: rotate by -2 samples to start with ONE [ONE, SQRT2, 0, -SQRT2, -ONE, -SQRT2, 0, SQRT2];
#[rtic::app(device = stm32h7xx_hal::stm32, peripherals = true, monotonic = rtic::cyccnt::CYCCNT)] #[rtic::app(device = stm32h7xx_hal::stm32, peripherals = true, monotonic = rtic::cyccnt::CYCCNT)]
const APP: () = { const APP: () = {
@ -90,7 +90,7 @@ const APP: () = {
let harmonic: i32 = -1; let harmonic: i32 = -1;
// Demodulation LO phase offset // Demodulation LO phase offset
let phase_offset: i32 = (0.7495 * i32::MAX as f32) as i32; // TODO: adapt to sequence rotation above let phase_offset: i32 = (0.25 * i32::MAX as f32) as i32;
let sample_frequency = (pll_frequency as i32).wrapping_mul(harmonic); let sample_frequency = (pll_frequency as i32).wrapping_mul(harmonic);
let sample_phase = phase_offset let sample_phase = phase_offset
.wrapping_add((pll_phase as i32).wrapping_mul(harmonic)); .wrapping_add((pll_phase as i32).wrapping_mul(harmonic));