Detailed Description
Sanity test for the ESP-DSP real-FFT backend in fl::audio::fft.
Validates that detail::espDspRealForward() produces mathematically correct output for several known test signals. Does NOT compare against kiss_fftr directly (kiss defaults to FIXED16 int16 on FastLED; ESP-DSP is float32, so scale/precision differ). Instead checks known analytic properties:
sine_single: delta at bin k, ~0 elsewhere. Peak|mag > 10 × next|mag. impulse: uniform magnitude across all bins (flat spectrum). dc: only bin 0 non-zero; bins 1..N/2 effectively zero. zero_input: all bins zero.
The ESP-DSP backend is auto-detected via FL_HAS_INCLUDE("esp_dsp.h") — no opt-in #define needed. ESP32 variants whose toolchain does not ship esp_dsp.h (esp32c2 / esp32s2 / esp32h2 / esp32c5) fall through to the empty-sketch path below and build cleanly. See issues #2308 / #2629.
Usage (ESP32 only): bash compile esp32s3 –examples AudioFftParity bash debug AudioFftParity –expect FFT_PARITY_PASS –fail-on FFT_PARITY_FAIL or: bash autoresearch esp32s3 ... (wire up a custom expect via –expect)
Definition in file AudioFftParity.ino.
#include <Arduino.h>#include <FastLED.h>#include "fl/math/math.h"#include "fl/audio/fft/fft_backend.h"
Include dependency graph for AudioFftParity.ino:Go to the source code of this file.
Functions | |
| void | loop () |
| void | setup () |
