streams-audiokit-sd-audiokit.ino

Author: pschatzmann

examples/examples-audiokit/streams-audiokit-sd-audiokit/streams-audiokit-sd-audiokit.ino

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+/**
+ * @file streams-audiokit-sd-audiokit.ino
+ * @author Phil Schatzmann
+ * @brief We record the input from the microphone to a file and constantly repeat to play the file
+ * @version 0.1
+ * @date 2022-09-01
+ * 
+ * @copyright Copyright (c) 2022
+ * 
+ */
+#include "AudioTools.h"
+#include "AudioLibs/AudioKit.h"
+#include <SPI.h>
+#include <SD.h>
+
+const char *file_name = "/rec.raw";
+uint16_t sample_rate = 16000;
+uint8_t channels = 1;  // The stream will have 2 channels 
+AudioKitStream kit;
+File file;   // final output stream
+StreamCopy copier; // copies data
+bool recording = false;  // flag to make sure that close is only executed one
+uint64_t end_time; // trigger to call endRecord
+ 
+
+void startRecord() {
+  Serial.println("Recording...");
+  // open the output file
+  file = SD.open(file_name, FILE_WRITE);
+  copier.begin(file, kit);  
+  recording = true; 
+}
+
+void endRecord() {
+  if (recording == true){
+    Serial.println("Playing...");
+    file.close();
+    recording = false;
+    file = SD.open(file_name); // reopen in read mode
+    copier.begin(kit, file);  // start playback
+  }
+}
+
+void setup(){
+  Serial.begin(115200);
+  while(!Serial); // wait for serial to be ready
+  AudioLogger::instance().begin(Serial, AudioLogger::Info);  
+
+  // Open SD drive
+  if (!SD.begin(PIN_AUDIO_KIT_SD_CARD_CS)) {
+    Serial.println("initialization failed!");
+    while (1); // stop
+  }
+  Serial.println("initialization done.");
+
+  // setup input and output
+  auto cfg = kit.defaultConfig(RXTX_MODE);
+  cfg.sd_active = true;
+  cfg.sample_rate = sample_rate;
+  cfg.channels = channels;
+  cfg.input_device = AUDIO_HAL_ADC_INPUT_LINE2;
+  kit.begin(cfg);
+  kit.setVolume(1.0);
+
+  startRecord();
+  end_time = millis()+5000; // record for 5 seconds
+
+}
+
+void loop(){
+  // time based stop recording
+  if (recording && millis()>end_time){
+    endRecord();
+  }
+
+  // record or play file
+  copier.copy();  
+
+  // while playing: at end of file -> reposition to beginning 
+  if (file.size()>0 && file.available()==0){
+      file.seek(0);
+      Serial.println("Replay...");
+  }
+}