NRF52_PDM_PWMTest.ino

For Arduino XIAO 52840 Sense

Recording (pin A0) and playback (pin 5)

This example demonstrates recording and playback on a single device using PDM microphone and PWM output

#include <AutoAnalogAudio.h>
AutoAnalog aaAudio;
 
// REQUIRES MBed Enabled Core for NRF52 (XIAO 52840 Sense)
 
void setup() {
  
  //Startup the PDM Microphone and PWM(pseudo DAC) on pin 5
  aaAudio.begin(1, 1);
  aaAudio.autoAdjust = 0;
  aaAudio.adcBitsPerSample = 16; // 16-bit audio at 16khz is the default on NRF52 and cannot be modified currently (in progress)
  aaAudio.dacBitsPerSample = 16;
  aaAudio.setSampleRate(16000);
 
}
 
void loop() {
 
  aaAudio.getADC(320); // Get 320 Samples from the ADC
  for (int i = 0; i < 320; i++) {  // Copy them into the DAC Buffer and change from signed to unsigned ( + 0x8000)
    aaAudio.dacBuffer16[i] = (uint16_t)(aaAudio.adcBuffer16[i] + 0x8000);
  }
  aaAudio.feedDAC(0,320); // Feed the DAC with the ADC data
}