// Record sound as raw data to a SD card, and play it back.
//
// Requires the audio shield:
// http://www.pjrc.com/store/teensy3_audio.html
//
// Three pushbuttons need to be connected:
// Record Button: pin 0 to GND
// Stop Button: pin 1 to GND
// Play Button: pin 2 to GND
//
// This example code is in the public domain.
#include <Bounce.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
// GUItool: begin automatically generated code
AudioInputI2S i2s2;
AudioInputAnalog adc1;
AudioAnalyzePeak peak1;
AudioRecordQueue queue1;
AudioPlaySdRaw playRaw1;
AudioOutputI2S i2s1;
AudioOutputAnalog dac1;
AudioConnection patchCord1(adc1, 0, queue1, 0);
AudioConnection patchCord2(adc1, 0, peak1, 0);
AudioConnection patchCord3(playRaw1, 0, dac1, 0);
//AudioConnection patchCord4(playRaw1, 0, dac1, 1);
//AudioControlSGTL5000 sgtl5000_1;
// GUItool: end automatically generated code
// Bounce objects to easily and reliably read the buttons
Bounce buttonRecord = Bounce(0, 8);
Bounce buttonStop = Bounce(1, 8); // 8 = 8 ms debounce time
Bounce buttonPlay = Bounce(2, 8);
// which input on the audio shield will be used?
//const int myInput = AUDIO_INPUT_LINEIN;
//const int myInput = AUDIO_INPUT_MIC;
// Use these with the Teensy Audio Shield
//#define SDCARD_CS_PIN 10
//#define SDCARD_MOSI_PIN 7
//#define SDCARD_SCK_PIN 14
// Use these with the Teensy 3.5 & 3.6 SD card
//#define SDCARD_CS_PIN BUILTIN_SDCARD
//#define SDCARD_MOSI_PIN 11 // not actually used
//#define SDCARD_SCK_PIN 13 // not actually used
// Use these for the SD adapter
#define SDCARD_CS_PIN 10
#define SDCARD_MOSI_PIN 11
#define SDCARD_SCK_PIN 13
// Remember which mode we're doing
int mode = 0; // 0=stopped, 1=recording, 2=playing
// The file where data is recorded
File frec;
void setup() {
// Configure the pushbutton pins
pinMode(0, INPUT_PULLUP);
pinMode(1, INPUT_PULLUP);
pinMode(2, INPUT_PULLUP);
// Audio connections require memory, and the record queue
// uses this memory to buffer incoming audio.
AudioMemory(60);
// Enable the audio shield, select input, and enable output
// sgtl5000_1.enable();
// sgtl5000_1.inputSelect(myInput);
// sgtl5000_1.volume(0.5);
// Initialize the SD card
SPI.setMOSI(SDCARD_MOSI_PIN);
SPI.setSCK(SDCARD_SCK_PIN);
if (!(SD.begin(SDCARD_CS_PIN))) {
// stop here if no SD card, but print a message
while (1) {
Serial.println("Unable to access the SD card");
delay(500);
}
}
}
void loop() {
// First, read the buttons
buttonRecord.update();
buttonStop.update();
buttonPlay.update();
// Respond to button presses
if (buttonRecord.fallingEdge()) {
Serial.println("Record Button Press");
if (mode == 2) stopPlaying();
if (mode == 0) startRecording();
}
if (buttonStop.fallingEdge()) {
Serial.println("Stop Button Press");
if (mode == 1) stopRecording();
if (mode == 2) stopPlaying();
}
if (buttonPlay.fallingEdge()) {
Serial.println("Play Button Press");
if (mode == 1) stopRecording();
if (mode == 0) startPlaying();
}
// If we're playing or recording, carry on...
if (mode == 1) {
continueRecording();
}
if (mode == 2) {
continuePlaying();
}
// when using a microphone, continuously adjust gain
//if (myInput == AUDIO_INPUT_MIC) adjustMicLevel();
}
void startRecording() {
Serial.println("startRecording");
if (SD.exists("RECORD.RAW")) {
// The SD library writes new data to the end of the
// file, so to start a new recording, the old file
// must be deleted before new data is written.
SD.remove("RECORD.RAW");
}
frec = SD.open("RECORD.RAW", FILE_WRITE);
if (frec) {
queue1.begin();
mode = 1;
}
}
void continueRecording() {
if (queue1.available() >= 2) {
byte buffer[512];
// Fetch 2 blocks from the audio library and copy
// into a 512 byte buffer. The Arduino SD library
// is most efficient when full 512 byte sector size
// writes are used.
memcpy(buffer, queue1.readBuffer(), 256);
queue1.freeBuffer();
memcpy(buffer+256, queue1.readBuffer(), 256);
queue1.freeBuffer();
// write all 512 bytes to the SD card
elapsedMicros usec = 0;
frec.write(buffer, 512);
// Uncomment these lines to see how long SD writes
// are taking. A pair of audio blocks arrives every
// 5802 microseconds, so hopefully most of the writes
// take well under 5802 us. Some will take more, as
// the SD library also must write to the FAT tables
// and the SD card controller manages media erase and
// wear leveling. The queue1 object can buffer
// approximately 301700 us of audio, to allow time
// for occasional high SD card latency, as long as
// the average write time is under 5802 us.
//Serial.print("SD write, us=");
//Serial.println(usec);
}
}
void stopRecording() {
Serial.println("stopRecording");
queue1.end();
if (mode == 1) {
while (queue1.available() > 0) {
frec.write((byte*)queue1.readBuffer(), 256);
queue1.freeBuffer();
}
frec.close();
}
mode = 0;
}
void startPlaying() {
Serial.println("startPlaying");
playRaw1.play("RECORD.RAW");
mode = 2;
}
void continuePlaying() {
if (!playRaw1.isPlaying()) {
playRaw1.stop();
mode = 0;
}
}
void stopPlaying() {
Serial.println("stopPlaying");
if (mode == 2) playRaw1.stop();
mode = 0;
}
void adjustMicLevel() {
// TODO: read the peak1 object and adjust sgtl5000_1.micGain()
// if anyone gets this working, please submit a github pull request :-)
}
