SimpleSine.ino

For Arduino Due

Simple Sine Wave Generation Example:

This example demonstrates simple generation of a sine wave & optionally broadcasting the audio via radio

Send a number 1 or 2 over Serial to change frequency, +/- to adjust volume

Note

This code depends on radio.h located in the same directory.

 
/*
    AutoAnalogAudio streaming via DAC & ADC by TMRh20
    Copyright (C) 2016  TMRh20 - tmrh20@gmail.com, github.com/TMRh20
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
*
* SineWave Example:
* Simple generation of a sine wave & optionally broadcasting the audio via radio
* Send a number 1 or 2 over Serial to change frequency, +/- to adjust volume
*
*/
 
 
#include <AutoAnalogAudio.h>
//#include <RF24.h>
//#include "myRadio.h"
 
AutoAnalog aaAudio;
 
void DACC_Handler(void) {
  aaAudio.dacHandler();   //Link the DAC ISR/IRQ to the library. Called by the MCU when DAC is ready for data
}
 
 
void setup() {
 
  Serial.begin(115200);
  Serial.println("Analog Audio Begin");
 
  //Optional: Setup the radio to broadcast the generated audio
  //setupRadio();
 
  aaAudio.begin(0, 1);          //Setup aaAudio using DAC
  aaAudio.autoAdjust = 0;       //Disable automatic timer adjustment
  aaAudio.setSampleRate(16050); //Set the sample rate to 16khz
  arraysetup();                 //Load the DAC buffer using a 32-step sine wave
 
}
 
char shiftVal = 0;
 
uint32_t dispTimer = 0;
 
void loop() {
 
 
  //AutoAdjust is disabled above, so this function will block until the DAC is ready for more data
  //All other processing needs to be completed before the DAC is out of data
  //In this example, the DAC is being fed data in chunks of 32 bytes or 32 8-bit samples
  aaAudio.feedDAC(0, 32);
 
  //Optional: Broadcast the audio over radio
  //radio.startFastWrite(&aaAudio.dacBuffer,32, 1);
 
  //Choose between two different frequencies via Serial command
  //Adjust the volume by sending a '+' or '-' over Serial
  if (Serial.available()) {
    char d = Serial.read();
    switch (d) {
      case '1': arraysetup(); break;
      case '2': arraysetup2(); break;
      case '+': shiftVal > 0 ? --shiftVal : NULL; break;
      case '-': shiftVal < 7 ? ++shiftVal : NULL; break;
      default: arraysetup(); break;
    }
    Serial.print("Volume: ");
    Serial.print(7 - shiftVal, DEC);
    Serial.println("/7");
  }
}
 
 
//Load a 32-step sine wave into the dacBuffer
//Shift the values according to volume
void arraysetup(void) {
  aaAudio.dacBuffer[0] = 127 >> shiftVal;
  aaAudio.dacBuffer[1] = 152 >> shiftVal;
  aaAudio.dacBuffer[2] = 176 >> shiftVal;
  aaAudio.dacBuffer[3] = 198 >> shiftVal;
  aaAudio.dacBuffer[4] = 217 >> shiftVal;
  aaAudio.dacBuffer[5] = 233 >> shiftVal;
  aaAudio.dacBuffer[6] = 245 >> shiftVal;
  aaAudio.dacBuffer[7] = 252 >> shiftVal;
  aaAudio.dacBuffer[8] = 254 >> shiftVal;
  aaAudio.dacBuffer[9] = 252 >> shiftVal;
  aaAudio.dacBuffer[10] = 245 >> shiftVal;
  aaAudio.dacBuffer[11] = 233 >> shiftVal;
  aaAudio.dacBuffer[12] = 217 >> shiftVal;
  aaAudio.dacBuffer[13] = 198 >> shiftVal;
  aaAudio.dacBuffer[14] = 176 >> shiftVal;
  aaAudio.dacBuffer[15] = 152 >> shiftVal;
  aaAudio.dacBuffer[16] = 128 >> shiftVal;
  aaAudio.dacBuffer[17] = 103 >> shiftVal;
  aaAudio.dacBuffer[18] = 79 >> shiftVal;
  aaAudio.dacBuffer[19] = 57 >> shiftVal;
  aaAudio.dacBuffer[20] = 38 >> shiftVal;
  aaAudio.dacBuffer[21] = 22 >> shiftVal;
  aaAudio.dacBuffer[22] = 10 >> shiftVal;
  aaAudio.dacBuffer[23] = 3 >> shiftVal;
  aaAudio.dacBuffer[24] = 0 >> shiftVal;
  aaAudio.dacBuffer[25] = 3 >> shiftVal;
  aaAudio.dacBuffer[26] = 10 >> shiftVal;
  aaAudio.dacBuffer[27] = 22 >> shiftVal;
  aaAudio.dacBuffer[28] = 38 >> shiftVal;
  aaAudio.dacBuffer[29] = 57 >> shiftVal;
  aaAudio.dacBuffer[30] = 79 >> shiftVal;
  aaAudio.dacBuffer[31] = 103 >> shiftVal;
}
 
//Load a 16-step sine wave into the dacBuffer
//Shift the values according to volume
void arraysetup2(void) {
  aaAudio.dacBuffer[0] = 127 >> shiftVal;
  aaAudio.dacBuffer[1] = 176 >> shiftVal;
  aaAudio.dacBuffer[2] = 217 >> shiftVal;
  aaAudio.dacBuffer[3] = 245 >> shiftVal;
  aaAudio.dacBuffer[4] = 254 >> shiftVal;
  aaAudio.dacBuffer[5] = 245 >> shiftVal;
  aaAudio.dacBuffer[6] = 217 >> shiftVal;
  aaAudio.dacBuffer[7] = 176 >> shiftVal;
  aaAudio.dacBuffer[8] = 128 >> shiftVal;
  aaAudio.dacBuffer[9] = 79 >> shiftVal;
  aaAudio.dacBuffer[10] = 38 >> shiftVal;
  aaAudio.dacBuffer[11] = 10 >> shiftVal;
  aaAudio.dacBuffer[12] = 0 >> shiftVal;
  aaAudio.dacBuffer[13] = 10 >> shiftVal;
  aaAudio.dacBuffer[14] = 38 >> shiftVal;
  aaAudio.dacBuffer[15] = 79 >> shiftVal;
  aaAudio.dacBuffer[16] = 127 >> shiftVal;
  aaAudio.dacBuffer[17] = 176 >> shiftVal;
  aaAudio.dacBuffer[18] = 217 >> shiftVal;
  aaAudio.dacBuffer[19] = 245 >> shiftVal;
  aaAudio.dacBuffer[20] = 254 >> shiftVal;
  aaAudio.dacBuffer[21] = 245 >> shiftVal;
  aaAudio.dacBuffer[22] = 217 >> shiftVal;
  aaAudio.dacBuffer[23] = 176 >> shiftVal;
  aaAudio.dacBuffer[24] = 128 >> shiftVal;
  aaAudio.dacBuffer[25] = 79 >> shiftVal;
  aaAudio.dacBuffer[26] = 38 >> shiftVal;
  aaAudio.dacBuffer[27] = 10 >> shiftVal;
  aaAudio.dacBuffer[28] = 0 >> shiftVal;
  aaAudio.dacBuffer[29] = 10 >> shiftVal;
  aaAudio.dacBuffer[30] = 38 >> shiftVal;
  aaAudio.dacBuffer[31] = 79 >> shiftVal;
}