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99 lines
4.9 KiB
99 lines
4.9 KiB
/*
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Oscillator with Pitch modulation
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Created: Patrick Radius, Jan 2017
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Purpose: Demonstrates the ability of the oscillator and pitch modulation.
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Demonstrates audio processing using floating point data type.
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Uses Teensy Audio Adapter.
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MIT License. use at your own risk.
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*/
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//These are the includes from the Teensy Audio Library
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#include <Audio.h> //Teensy Audio Librarya
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#include <Wire.h>
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#include <SPI.h>
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#include <SD.h>
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#include <SerialFlash.h>
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#include <OpenAudio_ArduinoLibrary.h> //for AudioConvert_I16toF32, AudioConvert_F32toI16, and AudioEffectGain_F32
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#define DO_USB 1 //set to 1 to enable USB audio. Be sure to go under the "Tools" menu and do "USB Type" -> "Audio"
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//create audio library objects for handling the audio
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AudioControlSGTL5000_Extended sgtl5000; //controller for the Teensy Audio Board
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AudioOutputI2S i2s_out; //Digital audio *to* the Teensy Audio Board DAC. Expects Int16. Stereo
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AudioConvert_F32toI16 float2Int; //Converts Float to Int16. See class in AudioStream_F32.h
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AudioSynthWaveform_F32 osc1; // Audio-rate oscillator.
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AudioSynthWaveform_F32 lfo1; // Low-frequency oscillator to modulate the main oscillator with.
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AudioConnection_F32 patchCord1(osc1, 0, float2Int, 0); // connect the oscillator to the float 2 int converter
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AudioConnection_F32 patchCord2(lfo1, 0, osc1, 0); // connect the output of the lfo to the mod input of the oscillator
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AudioConnection patchCord3(float2Int, 0, i2s_out, 0); //Left out.
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AudioConnection patchCord4(float2Int, 0, i2s_out, 1); //Right out.
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//For output, you always need an i2s or else you have no clock to drive the audio subsystem.
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//So, even if you're not going to use the headphone/line-out, you need these lines
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AudioConnection patchCord5(float2Int, 0, i2s_out, 0); //connect the Left float processor to the Left output.
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AudioConnection patchCord6(float2Int, 0, i2s_out, 1); //connect the Right float processor to the Right output.
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//Now, if you want USB output, it gets enabled here
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#if DO_USB
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AudioOutputUSB usb_out;
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AudioConnection patchCord7(float2Int, 0, usb_out, 0); //connect the float processor to the Left output
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AudioConnection patchCord8(float2Int, 0, usb_out, 1); //connect the float processor to the Right output
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#endif
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// define the overall setup() function, the function that is called once when the device is booting
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void setup() {
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Serial.begin(115200); //open the USB serial link to enable debugging messages
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delay(500); //give the computer's USB serial system a moment to catch up.
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Serial.println("Teensy: AudioSynthWaveform_F32 example..."); //identify myself over the USB serial
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// Audio connections require memory, and the record queue
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// uses this memory to buffer incoming audio.
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AudioMemory(12); //allocate Int16 audio data blocks
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AudioMemory_F32(10); //allocate Float32 audio data blocks
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// Enable the audio shield, no input, and enable output
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sgtl5000.enable(); //start the audio board
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sgtl5000.volume(0.5); //volume can be 0.0 to 1.0. 0.5 seems to be the usual default.
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osc1.begin(1.0, 440.0, 0); // run main oscillator at nominal amplitude, note A4, sine wave
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lfo1.begin(1.0, 0.25, 1); // run lfo at nominal amplitude, 0.25hz (so 4 second period), saw wave
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osc1.pitchModAmount(3.0); // Set the amount of pitch modulation to be around 3 octaves
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} //end setup()
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unsigned long curTime_millis = 0;
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unsigned long lastMemUpdate_millis=0;
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// define the loop() function, the function that is repeated over and over for the life of the device
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void loop() {
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printCPUandMemoryUsage(&Serial);
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} //end loop();
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void printCPUandMemoryUsage(Stream *s) {
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//print status information to the Serial port
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curTime_millis = millis(); //what time is it right now
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if ((curTime_millis - lastMemUpdate_millis) < 0) lastMemUpdate_millis=0; //handle case where millis wraps around!
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if ((curTime_millis - lastMemUpdate_millis) > 2000) { // print a summary of the current & maximum usage
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s->print("Usage/Max: ");
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s->print("oscillator CPU = "); s->print(osc1.processorUsage()); s->print("/"); s->print(osc1.processorUsageMax());s->print(", ");
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s->print("LFO CPU = "); s->print(lfo1.processorUsage()); s->print("/"); s->print(lfo1.processorUsageMax());s->print(", ");
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s->print("all CPU = " ); s->print(AudioProcessorUsage()); s->print("/"); s->print(AudioProcessorUsageMax());s->print(", ");
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s->print("Int16 Mem = ");s->print(AudioMemoryUsage()); s->print("/"); s->print(AudioMemoryUsageMax());s->print(", ");
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s->print("Float Mem = ");s->print(AudioMemoryUsage_F32());s->print("/"); s->print(AudioMemoryUsageMax_F32()); s->print(", ");
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s->println();
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lastMemUpdate_millis = curTime_millis; //we will use this value the next time around.
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}
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};
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