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examples/Mic_FFT: pace drawing by captured audio, build on PC #407

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Merged
lovyan03 merged 1 commit into from
Oct 15, 2026
Merged

examples/Mic_FFT: pace drawing by captured audio, build on PC #407

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26 changes: 24 additions & 2 deletions examples/Advanced/Mic_FFT/Mic_FFT.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -9,15 +9,24 @@

#include <set>
#include <map>
#include <stdlib.h>

static void* memory_alloc(size_t size)
{
#if defined ( ESP_PLATFORM )
return heap_caps_malloc(size, MALLOC_CAP_8BIT);
#else
return malloc(size);
#endif
}

static void memory_free(void* ptr)
{
#if defined ( ESP_PLATFORM )
heap_caps_free(ptr);
#else
free(ptr);
#endif
}

struct wav_data_t {
Expand Down Expand Up @@ -719,10 +728,10 @@ void setup(void)
fft_data.sample_rate = SAMPLE_RATE;
fft_data.wav_data = &wav_data;
fft_data.length = (1 << (fft_data.fft_size_bits - 1)) + 1;
fft_data.fdata = (typeof(fft_data.fdata))memory_alloc(fft_data.length * sizeof(fft_data.fdata[0]));
fft_data.fdata = (decltype(fft_data.fdata))memory_alloc(fft_data.length * sizeof(fft_data.fdata[0]));

wav_data.length = WAVE_TOTAL_SIZE;
wav_data.wav = (typeof(wav_data.wav))memory_alloc(WAVE_TOTAL_SIZE * sizeof(wav_data.wav[0]));
wav_data.wav = (decltype(wav_data.wav))memory_alloc(WAVE_TOTAL_SIZE * sizeof(wav_data.wav[0]));
memset(wav_data.wav, 0 , WAVE_TOTAL_SIZE * sizeof(int16_t));
}

Expand All @@ -732,14 +741,27 @@ void loop(void)

if (M5.Mic.isEnabled())
{
static bool has_new_block = false;
int wav_idx = wav_data.latest_index;
while (M5.Mic.isRecording() < 2) {
M5.Mic.record(&(wav_data.wav[wav_idx]), WAVE_BLOCK_SIZE, SAMPLE_RATE, false);
wav_idx += WAVE_BLOCK_SIZE;
if (wav_idx >= WAVE_TOTAL_SIZE) { wav_idx = 0; }
wav_data.latest_index = wav_idx;
has_new_block = true;
};

// Start a new drawing cycle only after a new block has been captured,
// so the history scrolls at the capture rate even on a fast display.
if (step < 0 || step >= 4)
{
if (!has_new_block) {
M5.delay(1);
return;
}
has_new_block = false;
}

{
switch (++step) {
default:
Expand Down
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