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Work on adc_mic.c

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I get values, but they are all 16380 (0x3FFC).
This commit is contained in:
Thomas Farstrike
2026-02-12 21:23:15 +01:00
parent e8a4682486
commit 07f7c43fa4
1 changed files with 36 additions and 3 deletions
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c_mpos/src/adc_mic.c
+36 -3
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@@ -4,15 +4,30 @@
#include "esp_heap_caps.h"
#include "esp_codec_dev.h" // Include for esp_codec_dev_*
#include "adc_mic.h" // Include for audio_codec_adc_cfg_t, audio_codec_new_adc_data, etc.
#include "sdkconfig.h" // for CONFIG_ADC_MIC_TASK_CORE
#include <errno.h> // For ENOMEM
#define ADC_MIC_DEBUG_PRINT(...) mp_printf(&mp_plat_print, __VA_ARGS__)
static mp_obj_t adc_mic_read(void) {
ADC_MIC_DEBUG_PRINT("Starting adc_mic_read...\n");
ADC_MIC_DEBUG_PRINT("CONFIG_ADC_MIC_TASK_CORE: %d\n", CONFIG_ADC_MIC_TASK_CORE);
// Configure for mono ADC on GPIO1 (ADC1_CHANNEL_0) at 16kHz
audio_codec_adc_cfg_t cfg = DEFAULT_AUDIO_CODEC_ADC_MONO_CFG(ADC_CHANNEL_0, 16000);
//audio_codec_adc_cfg_t cfg = DEFAULT_AUDIO_CODEC_ADC_MONO_CFG(ADC_CHANNEL_0, 16000);
audio_codec_adc_cfg_t cfg = {
.handle = NULL,
.max_store_buf_size = 1024 * 2,
.conv_frame_size = 1024,
.unit_id = ADC_UNIT_1,
.adc_channel_list = ((uint8_t[]){ADC_CHANNEL_0}),
.adc_channel_num = 1,
.sample_rate_hz = 16000,
//.atten = ADC_ATTEN_DB_0, // ← try 0 dB first (0–1.1 V range, higher gain)
.atten = ADC_ATTEN_DB_2_5, // ← try 0 dB first (0–1.1 V range, higher gain)
// or ADC_ATTEN_DB_2_5 for ~0–1.5 V
// keep other fields as default or explicit
};
ADC_MIC_DEBUG_PRINT("Config created for channel %d, sample rate %d\n", ADC_CHANNEL_0, 16000);
ADC_MIC_DEBUG_PRINT("Creating ADC data interface...\n");
@@ -54,7 +69,8 @@ static mp_obj_t adc_mic_read(void) {
ADC_MIC_DEBUG_PRINT("Codec device opened successfully\n");
// Allocate buffer for 16000 samples (16-bit, so 32000 bytes)
const size_t buf_size = 16000 * sizeof(int16_t);
//const size_t buf_size = 16000 * sizeof(int16_t);
const size_t buf_size = 64 * sizeof(int16_t);
ADC_MIC_DEBUG_PRINT("Allocating buffer of size %zu bytes...\n", buf_size);
int16_t *audio_buffer = (int16_t *)heap_caps_malloc(buf_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
if (audio_buffer == NULL) {
@@ -81,7 +97,24 @@ static mp_obj_t adc_mic_read(void) {
// Create MicroPython bytes object from the buffer
ADC_MIC_DEBUG_PRINT("Creating bytes object from buffer...\n");
mp_obj_t buf_obj = mp_obj_new_bytes((const byte *)audio_buffer, ret);
mp_obj_t buf_obj;
if (ret >= 0) {
ADC_MIC_DEBUG_PRINT("Creating full bytes object from buffer...\n");
buf_obj = mp_obj_new_bytes((const byte *)audio_buffer, buf_size);
ADC_MIC_DEBUG_PRINT("First 16 samples:\n");
size_t samples_to_print = 16;
for (size_t i = 0; i < samples_to_print; i++) {
int16_t sample = audio_buffer[i];
ADC_MIC_DEBUG_PRINT("%4d (0x%04X) ", sample, (uint16_t)sample);
if ((i + 1) % 4 == 0) ADC_MIC_DEBUG_PRINT("\n");
}
ADC_MIC_DEBUG_PRINT("\n");
} else {
ADC_MIC_DEBUG_PRINT("Creating empty bytes object from buffer...\n");
buf_obj = mp_obj_new_bytes((const byte *)audio_buffer, 0);
}
// Cleanup
ADC_MIC_DEBUG_PRINT("Cleaning up...\n");