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Improve adc_mic

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This commit is contained in:
Thomas Farstrike
2026-02-15 15:41:15 +01:00
parent 4ab4e31de1
commit d256c54394
1 changed files with 11 additions and 9 deletions
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c_mpos/src/adc_mic.c
+11 -9
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@@ -25,11 +25,12 @@ static mp_obj_t adc_mic_read(void) {
.adc_channel_list = ((uint8_t[]){ADC_CHANNEL_0}),
.adc_channel_num = 1,
.sample_rate_hz = 16000,
//.atten = ADC_ATTEN_DB_2_5,
.atten = ADC_ATTEN_DB_11,
//.atten = ADC_ATTEN_DB_0, // values always 16380
//.atten = ADC_ATTEN_DB_2_5, // values always 16380
.atten = ADC_ATTEN_DB_6, // values around 12500 +/- 320 (silence) or 4000 (loud talk)
//.atten = ADC_ATTEN_DB_11, // values around -1130 +/- 160 (silence)
};
ADC_MIC_DEBUG_PRINT("Config created for channel %d, sample rate %d, atten %d\n",
ADC_CHANNEL_0, 16000, cfg.atten);
ADC_MIC_DEBUG_PRINT("Config created for channel %d, sample rate %d, atten %d\n", ADC_CHANNEL_0, 16000, cfg.atten);
// ────────────────────────────────────────────────
// Initialization (same as before)
@@ -65,10 +66,10 @@ static mp_obj_t adc_mic_read(void) {
// ────────────────────────────────────────────────
// Small reusable buffer + tracking variables
// ────────────────────────────────────────────────
const size_t chunk_samples = 512;
const size_t chunk_samples = 10240;
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);
int16_t *audio_buffer = heap_caps_malloc(buf_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
//int16_t *audio_buffer = heap_caps_thread.start_new_thread(testit, ())_malloc_prefer(buf_size, MALLOC_CAP_DEFAULT | MALLOC_CAP_SPIRAM, MALLOC_CAP_DEFAULT);
if (audio_buffer == NULL) {
esp_codec_dev_close(dev);
esp_codec_dev_delete(dev);
@@ -77,7 +78,7 @@ static mp_obj_t adc_mic_read(void) {
}
// How many chunks to read (adjust as needed)
const int N = 1; // e.g. 50 × 512 = ~1.5 seconds @ 16 kHz
const int N = 5; // e.g. 5 × 10240 = ~3.2 seconds @ 16 kHz
int16_t global_min = 32767;
int16_t global_max = -32768;
@@ -111,7 +112,8 @@ static mp_obj_t adc_mic_read(void) {
if (chunk < 3) {
ADC_MIC_DEBUG_PRINT("Chunk %d first 16 samples:\n", chunk);
for (size_t i = 0; i < 16; i++) {
ADC_MIC_DEBUG_PRINT("%6d ", audio_buffer[i]);
int16_t sample = audio_buffer[i];
ADC_MIC_DEBUG_PRINT("%6d (0x%04X)", sample, (uint16_t)sample);
if ((i + 1) % 8 == 0) ADC_MIC_DEBUG_PRINT("\n");
}
ADC_MIC_DEBUG_PRINT("\n");