Please add PDM example - proposal here

[Tuet]

Problem Description

Hi, very nice library, but I took me ages to get PDM on ESP32-S3 to output something usable. Culprit was that .pin_bck MUST be set, otherwise no audio. I got it working now, please add the following example that is derived from examples/examples-stream/streams-generator-i2s/streams-generator-i2s.ino

/streams-generator-i2s-pdm.ino

Device Description

Use a ESP32-S3, select any Pin for PDM where your Amp/Speaker is connected. You MUST choose another pin for clock output even if you not use it - otherwise NO audio output.

Sketch

/**  * @file streams-generator-i2s-pdm.ino  * @author Phil Schatzmann  * @brief see https://github.com/pschatzmann/arduino-audio-tools/blob/main/examples/examples-stream/streams-generator-i2s-pdm/README.md   * @copyright GPLv3  */ #include "AudioTools.h" AudioInfo info(44100, 2, 16); SineWaveGenerator<int16_t> sineWave(32000); // subclass of SoundGenerator with max amplitude of 32000 GeneratedSoundStream<int16_t> sound(sineWave); // Stream generated from sine wave I2SStream out; StreamCopy copier(out, sound); // copies sound into i2s // Arduino Setup void setup(void) { // Open Serial  Serial.begin(115200); while(!Serial); AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info); // start I2S Serial.println("starting I2S..."); auto config = out.defaultConfig(TX_MODE); // special PDM config starts here... config.signal_type = PDM; // Use PDM config.pin_data = 6; // Pin on that audio comes out (but Left+Right is merged together!) config.pin_bck = 17; // Pin where clock comes out (you MUST select a pin even if nothing is connected to it, otherwise no audio output even from .pin_data!) // ...end of PDM config. Rest is standard config. config.copyFrom(info); out.begin(config); // Setup sine wave sineWave.begin(info, N_B4); Serial.println("started..."); } // Arduino loop - copy sound to out  void loop() { copier.copy(); }

Other Steps to Reproduce

No response

What is your development environment (incl. core version info)

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I have checked existing issues, discussions and online documentation

• I confirm I have checked existing issues, discussions and online documentation

[pschatzmann]

Please submit a pull request