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ThomasFarstrikeThomasFarstrike
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Improve adc_mic
1 parent 4ab4e31 commit d256c54

1 file changed

Lines changed: 11 additions & 9 deletions

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‎c_mpos/src/adc_mic.c‎

Lines changed: 11 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -25,11 +25,12 @@ static mp_obj_t adc_mic_read(void) {
2525
.adc_channel_list = ((uint8_t[]){ADC_CHANNEL_0}),
2626
.adc_channel_num = 1,
2727
.sample_rate_hz = 16000,
28-
//.atten = ADC_ATTEN_DB_2_5,
29-
.atten = ADC_ATTEN_DB_11,
28+
//.atten = ADC_ATTEN_DB_0, // values always 16380
29+
//.atten = ADC_ATTEN_DB_2_5, // values always 16380
30+
.atten = ADC_ATTEN_DB_6, // values around 12500 +/- 320 (silence) or 4000 (loud talk)
31+
//.atten = ADC_ATTEN_DB_11, // values around -1130 +/- 160 (silence)
3032
};
31-
ADC_MIC_DEBUG_PRINT("Config created for channel %d, sample rate %d, atten %d\n",
32-
ADC_CHANNEL_0, 16000, cfg.atten);
33+
ADC_MIC_DEBUG_PRINT("Config created for channel %d, sample rate %d, atten %d\n", ADC_CHANNEL_0, 16000, cfg.atten);
3334

3435
// ────────────────────────────────────────────────
3536
// Initialization (same as before)
@@ -65,10 +66,10 @@ static mp_obj_t adc_mic_read(void) {
6566
// ────────────────────────────────────────────────
6667
// Small reusable buffer + tracking variables
6768
// ────────────────────────────────────────────────
68-
const size_t chunk_samples = 512;
69+
const size_t chunk_samples = 10240;
6970
const size_t buf_size = chunk_samples * sizeof(int16_t);
70-
//int16_t *audio_buffer = heap_caps_malloc(buf_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
71-
int16_t *audio_buffer = heap_caps_malloc_prefer(buf_size, MALLOC_CAP_DEFAULT | MALLOC_CAP_SPIRAM, MALLOC_CAP_DEFAULT);
71+
int16_t *audio_buffer = heap_caps_malloc(buf_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
72+
//int16_t *audio_buffer = heap_caps_thread.start_new_thread(testit, ())_malloc_prefer(buf_size, MALLOC_CAP_DEFAULT | MALLOC_CAP_SPIRAM, MALLOC_CAP_DEFAULT);
7273
if (audio_buffer == NULL) {
7374
esp_codec_dev_close(dev);
7475
esp_codec_dev_delete(dev);
@@ -77,7 +78,7 @@ static mp_obj_t adc_mic_read(void) {
7778
}
7879

7980
// How many chunks to read (adjust as needed)
80-
const int N = 1; // e.g. 50 × 512 = ~1.5 seconds @ 16 kHz
81+
const int N = 5; // e.g. 5 × 10240 = ~3.2 seconds @ 16 kHz
8182

8283
int16_t global_min = 32767;
8384
int16_t global_max = -32768;
@@ -111,7 +112,8 @@ static mp_obj_t adc_mic_read(void) {
111112
if (chunk < 3) {
112113
ADC_MIC_DEBUG_PRINT("Chunk %d first 16 samples:\n", chunk);
113114
for (size_t i = 0; i < 16; i++) {
114-
ADC_MIC_DEBUG_PRINT("%6d ", audio_buffer[i]);
115+
int16_t sample = audio_buffer[i];
116+
ADC_MIC_DEBUG_PRINT("%6d (0x%04X)", sample, (uint16_t)sample);
115117
if ((i + 1) % 8 == 0) ADC_MIC_DEBUG_PRINT("\n");
116118
}
117119
ADC_MIC_DEBUG_PRINT("\n");

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