100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
// I2S Audio Example for ESP32
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// This example demonstrates using I2S audio input to control FastLED strips
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// Based on audio levels from microphone or line input
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//
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// This example uses the extremely popular (as of 2025-September) INMP441 microphone.
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// Notes:
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// - Connect L/R to PWR so it's recognized as a right channel microphone.
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#include <Arduino.h>
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#include <FastLED.h>
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#include "fl/sstream.h"
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#include "fl/type_traits.h"
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#include "fl/audio_input.h"
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#include "platforms/esp/32/audio/sound_util.h"
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using fl::i16;
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// I2S Configuration
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#define I2S_WS_PIN 7 // Word Select (LRCLK)
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#define I2S_SD_PIN 8 // Serial Data (DIN)
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#define I2S_CLK_PIN 4 // Serial Clock (BCLK)
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#define I2S_CHANNEL fl::Right
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fl::AudioConfig config = fl::AudioConfig::CreateInmp441(I2S_WS_PIN, I2S_SD_PIN, I2S_CLK_PIN, I2S_CHANNEL);
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fl::shared_ptr<fl::IAudioInput> audioSource;
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void setup() {
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Serial.begin(115200);
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Serial.println("I2S Audio FastLED Example");
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Serial.println("Waiting 5000ms for audio device to stdout initialization...");
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delay(5000);
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// Initialize I2S Audio
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fl::string errorMsg;
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audioSource = fl::IAudioInput::create(config, &errorMsg);
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if (!audioSource) {
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Serial.print("Failed to create audio source: ");
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Serial.println(errorMsg.c_str());
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return;
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}
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// Start audio capture
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Serial.println("Starting audio capture...");
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audioSource->start();
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// Check for start errors
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fl::string startErrorMsg;
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if (audioSource->error(&startErrorMsg)) {
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Serial.print("Audio start error: ");
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Serial.println(startErrorMsg.c_str());
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return;
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}
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Serial.println("Audio capture started!");
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}
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void loop() {
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EVERY_N_MILLIS(1000) { Serial.println("loop active."); }
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// Check if audio source is valid
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if (!audioSource) {
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Serial.println("Audio source is null!");
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delay(1000);
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return;
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}
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// Check for audio errors
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fl::string errorMsg;
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if (audioSource->error(&errorMsg)) {
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Serial.print("Audio error: ");
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Serial.println(errorMsg.c_str());
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delay(100);
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return;
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}
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// Read audio data
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fl::AudioSample sample = audioSource->read();
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if (sample.isValid()) {
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EVERY_N_MILLIS(100) {
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const auto& audioBuffer = sample.pcm();
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const i16* max_sample = fl::max_element(audioBuffer.begin(), audioBuffer.end());
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const i16* min_sample = fl::min_element(audioBuffer.begin(), audioBuffer.end());
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fl::sstream ss;
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ss << "\nRead " << audioBuffer.size() << " samples, timestamp: " << sample.timestamp() << "ms\n";
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ss << "Max sample: " << *max_sample << "\n";
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ss << "Min sample: " << *min_sample << "\n";
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ss << "RMS: " << sample.rms() << "\n";
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ss << "ZCF: " << sample.zcf() << "\n";
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FL_WARN(ss.str());
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}
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}
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}
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