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'Software' was the directory everything that was not KiCad ended up in, which stopped describing anything a while ago - Validation and the web app are software too. Worse, it put the shared parts inside the firmware, where they read as the firmware's own. They are not. Effects/ has three consumers built from it: the firmware, Validation's bench, and the web app's controls, all generated from the same POT: comments by gen_effects.py. Audio/ has two - the bench compiles the same biquads, the same envelope followers and the same single_sample(), which is the whole reason a measurement on a workstation says anything about the pedal. Neither belongs under Firmware/, so neither is under it any more: Effects/ one file per effect Audio/ the DSP they are built from, and the audio loop Firmware/ the rest of what runs on the pedal, and the submodules WebMIDI/ the web app scripts/ what the build runs Validation/ unchanged Hardware/, Documentation/, Images/ CMakeLists.txt and the wrapper Makefile move to the top with them, because the build now consumes four of those directories and generates into a fifth. board.local and build/ come along; MIDI_CC_MAP.md is generated into Documentation/ rather than into the old Software/ root. scripts/ goes with the build rather than staying under the firmware, because six of the ten had nothing to do with the firmware: gen_effects.py reads Effects/ and writes to three different places, pow2/log2/quarter_sine generate Audio/'s tables, check-readme.py compares Effects/ against the README, and server.py serves the web app. Four of them are invoked from Validation, which was reaching into Firmware/ for tooling - the same burying this commit is undoing. The four that really are about the firmware are ELF checks the top-level build drives anyway, and a second scripts directory would only be a second place to look. C includes say "Audio/foo.h" and the generated map says "Effects/bar.h", with the repository root on the include path for both the firmware and the bench. Spelling the directory out rather than relying on a bare name is what keeps Audio/cycles.h shimmable: a quoted include searches the including file's own directory first. The submodules are renamed as well as moved. git mv updates their paths but leaves the section names, and 'Software/pico-sdk' surviving in .gitmodules would be the word this commit removes, still load-bearing. That meant the nested modules under pico-sdk too - six .git files pointing into .git/modules/Software - which is why 'git submodule update --init --recursive' is worth running once after pulling this. Verified rather than assumed: a clean configure and build, make check (failing only on the missing-eeprom case it already failed on), check-effects, all four analysis pages reproducing every series and drawing every chart, and a flash to the board that still measures a routed reverb where it did before. One latent bug fell out of it. bench/coeff declared only quarter_sine.h of the three generated math tables, and Audio/util.h includes pow2.h and log2.h as well - so building that target with an empty gen/ could never have worked. 'make bench' builds bench/bench first, which generates all three, so it stayed hidden until this rebuilt everything from nothing. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
// NAME: Flanger [FLANGER]
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// PRIORITY: 60
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// POT: "Freq" SQUARED(0.0 10.0) = 2.5 Hz
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// POT: "Delay" LINEAR(0.0 4.0) = 2.0 ms
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// POT: "Depth" LINEAR(0.0 1.0) = 0.5
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// POT: "Feedback" LINEAR(0.0 1.0) = 0.5
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// Flanger effect based on the MIT-licensed DaisySP library by Electrosmith
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// which in turn seems to be based on Soundpipe by Paul Batchelor
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static struct {
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struct lfo_state lfo;
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float delay, depth, feedback;
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// Large enough history buffer for 10ms
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unsigned int idx;
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float samples[1024];
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} flanger;
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static inline void flanger_init(unsigned char pot[10])
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{
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set_lfo_freq(&flanger.lfo, flanger_freq_pot(pot));
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flanger.delay = flanger_delay_pot(pot) * SAMPLES_PER_MSEC;
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flanger.depth = flanger_depth_pot(pot);
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flanger.feedback = flanger_feedback_pot(pot);
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}
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static inline float flanger_step(float in)
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{
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float d = 1 + flanger.delay * (1 + lfo_step(&flanger.lfo, lfo_sinewave) * flanger.depth);
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float out;
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out = sample_array_read(d, &flanger.idx, flanger.samples);
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sample_array_write(tanhf(in + out * flanger.feedback), &flanger.idx, flanger.samples);
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return (in + out) / 2;
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}
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