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improved support for PDM microphones (SPM1423)

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seems that the "swapped channel" workaround is not needed for PDM.
This commit is contained in:
Frank
2022-11-09 00:01:40 +01:00
parent 9fdc176a9e
commit 20aebf2789
2 changed files with 15 additions and 4 deletions
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2
usermods/audioreactive/audio_reactive.h
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@@ -1149,7 +1149,7 @@ class AudioReactive : public Usermod {
#if !defined(CONFIG_IDF_TARGET_ESP32S2) && !defined(CONFIG_IDF_TARGET_ESP32C3)
case 5:
DEBUGSR_PRINT(F("AR: I2S PDM Microphone - ")); DEBUGSR_PRINTLN(F(I2S_MIC_CHANNEL_TEXT));
audioSource = new I2SSource(SAMPLE_RATE, BLOCK_SIZE);
audioSource = new I2SSource(SAMPLE_RATE, BLOCK_SIZE, true, 1.0f/4.0f);
delay(100);
if (audioSource) audioSource->initialize(i2swsPin, i2ssdPin);
break;

17
usermods/audioreactive/audio_source.h
View File

@@ -201,11 +201,20 @@ class I2SSource : public AudioSource {
return;
}
} else {
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 2, 0)
#if !defined(SOC_I2S_SUPPORTS_PDM_RX)
#warning this MCU does not support PDM microphones
#endif
#endif
#if !defined(CONFIG_IDF_TARGET_ESP32S2) && !defined(CONFIG_IDF_TARGET_ESP32C3)
// example from espressif: https://github.com/espressif/esp-idf/blob/release/v4.4/examples/peripherals/i2s/i2s_audio_recorder_sdcard/main/i2s_recorder_main.c
// This is an I2S PDM microphone, these microphones only use a clock and
// data line, to make it simpler to debug, use the WS pin as CLK and SD
// pin as DATA
_config.mode = i2s_mode_t(I2S_MODE_MASTER | I2S_MODE_RX | I2S_MODE_PDM); // Change mode to pdm if clock pin not provided. PDM is not supported on ESP32-S2. PDM RX not supported on ESP32-C3
_config.channel_format =I2S_CHANNEL_FMT_ONLY_LEFT; // seems that PDM mono mode always uses left channel.
//_config.use_apll = true; // experimental - use aPLL clock source to improve sampling quality
//_config.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT; // not needed
#endif
}
@@ -249,9 +258,11 @@ class I2SSource : public AudioSource {
DEBUGSR_PRINTF("AR: I2S#0 driver %s aPLL; fixed_mclk=%d.\n", _config.use_apll? "uses":"without", _config.fixed_mclk);
DEBUGSR_PRINTF("AR: Sample scaling factor = %6.4f\n", _sampleScale);
if(_config.mode & I2S_MODE_MASTER)
DEBUGSR_PRINTLN(F("AR: I2S#0 driver installed in MASTER mode."));
else
if(_config.mode & I2S_MODE_MASTER) {
if (_config.mode & I2S_MODE_PDM)
DEBUGSR_PRINTLN(F("AR: I2S#0 driver installed in PDM MASTER mode."));
else DEBUGSR_PRINTLN(F("AR: I2S#0 driver installed in MASTER mode."));
} else
DEBUGSR_PRINTLN(F("AR: I2S#0 driver installed in SLAVE mode."));
err = i2s_set_pin(I2S_NUM_0, &_pinConfig);