output single frecuency CS4344

E

enrique

New member
Hi, I'm trying to understand how this i2s protocol works and what can be done with it for later play with DSP filters.
For now I 'm only trying to generate a simple tone with the Teensy 4.1 and convert to analog with the CS4344, then measure frequency with a scope.

I connected the Teensy pins as described in this tread:


I tried this code but I'm only getting noise. What I'm doing wrong?

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
// GUItool: begin automatically generated code

AudioSynthWaveformSine sine1; //xy=1920.0595201764784,4686.488091605049
AudioOutputI2S i2s1; //xy=2137.9166630336213,4702.91666303362
AudioConnection patchCord1(sine1, 0, i2s1, 0);
AudioConnection patchCord2(sine1, 1, i2s1, 1);
// GUItool: end automatically generated code
void setup(){
sine1.frequency(1000);
sine1.amplitude(1);
}
void loop(){
 
You need to give it some AudioMemory to work with, like so:
C++: 
void setup() {
  AudioMemory(8);
  sine1.frequency(1000);
  sine1.amplitude(1);
}

Paul
 
Hi Paul. Still nothing on the output, with AudioMemory(8) added.
What should I expect on teensy's pins when probe with oscilloscope?

currently:
SDIN varing amplitude square wave
SCLK 11.2 MHz
LRCK 11.2 MHz
MCLK 11.2 MHz

I'm using a clone of this board:

Pmod I2S2 - Digilent Reference

digilent.com digilent.com

Enrique
 
HI Paul, Finally I got the Signal working.

This is the code that works:

#include <Audio.h>

AudioSynthWaveformSine sine1;
AudioOutputI2S i2s1;
AudioControlSGTL5000 audioShield;
AudioConnection patchCord1(sine1, 0, i2s1, 0);
AudioConnection patchCord2(sine1, 0, i2s1, 1);
void setup() {
AudioMemory(10);
audioShield.enable();
audioShield.volume(0.5);
sine1.frequency(1000);
sine1.amplitude(0.5);
}
void loop() {

}
//MCLK pin 23
// SCK (BCLK) Pin 21 (BCLK)
// WS (LRCLK) Pin 20 (LRCLK)
// SDIN Pin 7 (TX)
// GND GND
// VCC (3.3V) 3.3V


It's possible to generate a higher frequency, like 96 khz sampling at 192 khz?

Enrique
 
You must log in or register to reply here.
Back
Top