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adc_mic works but brittle

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Thomas Farstrike
2026-02-12 22:49:19 +01:00
parent 887e24dac3
commit 9824221374
1 changed files with 2 additions and 2 deletions
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c_mpos/src/adc_mic.c
+2 -2
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@@ -65,7 +65,7 @@ static mp_obj_t adc_mic_read(void) {
// ────────────────────────────────────────────────
// Small reusable buffer + tracking variables
// ────────────────────────────────────────────────
const size_t chunk_samples = 64;
const size_t chunk_samples = 512;
const size_t buf_size = chunk_samples * sizeof(int16_t);
//int16_t *audio_buffer = heap_caps_malloc(buf_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
int16_t *audio_buffer = heap_caps_malloc_prefer(buf_size, MALLOC_CAP_DEFAULT | MALLOC_CAP_SPIRAM, MALLOC_CAP_DEFAULT);
@@ -77,7 +77,7 @@ static mp_obj_t adc_mic_read(void) {
}
// How many chunks to read (adjust as needed)
const int N = 10; // e.g. 50 × 64 = 3200 samples (~0.2 seconds @ 16 kHz)
const int N = 1; // e.g. 50 × 512 = ~1.5 seconds @ 16 kHz
int16_t global_min = 32767;
int16_t global_max = -32768;