Example ino file for using MQSL and MOSI/CS at the same time

t4-sound-display.ino

// This uses the Adafruit ST7735 tft display and teensy 4.0

// audio out -> teensy pin mappings
/*
  + -> 12
  - -> GND
*/

// tft -> teensy pin mappings:
/*
  Vin -> 3.3V (next to VBat)
  Gnd -> GND
  SCK -> 13 (SCK)
  SI -> 11 (MOSI)
  TCS -> 10 (CS)
  RST -> 8 (PWM)
  DC -> 9 (PWM)
*/

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

#include <Adafruit_ST7735.h>
#include <SPI.h>

#define TFT_MOSI 11
#define TFT_SCK  13
#define TFT_DC   9 
#define TFT_CS   10  
#define TFT_RST  8

Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);

float sweep_seconds = 3;   // Length of time for the sweep in seconds

void setup(void)
{
  // Wait for at least 3 seconds for the USB serial connection
  Serial.begin (9600);
  while (!Serial && millis () < 3000);

  tft.initR(INITR_144GREENTAB); // ST7735R

  AudioMemory (8);
  Serial.println ("setup done");
  
  AudioSynthToneSweep tonesweep;
  AudioMixer4 mixer1;
  
  unsigned prev_pin10_config = CORE_PIN10_CONFIG; // 21
  AudioOutputMQS mqs;
  CORE_PIN10_CONFIG = prev_pin10_config;
  
  AudioConnection   patchCord1 (tonesweep, 0, mixer1, 0);
  AudioConnection   patchCord4 (mixer1,    0, mqs,    0);

  char str[8];
  while (1) {
    itoa(millis(), str, 10);
    displayText(str);
    for (int i=0; i < 300; i++) {
      do_sweep(tonesweep, mixer1, mqs);
      sweep_seconds *= 0.9;
    }
    sweep_seconds = 3;
  }

  Serial.println ("Done");
}

void loop (void)
{
}

void do_sweep (AudioSynthToneSweep& tonesweep, AudioMixer4& mixer1, AudioOutputMQS& mqs)
{
  float gain = 1.0f;
  mixer1.gain (0, gain);

  Serial.printf ("Sweep down");
  if (!tonesweep.play(0.8, 2000, 200, sweep_seconds)) {
    Serial.println("ToneSweep - play failed");
    while (1);
  }
  while (tonesweep.isPlaying ());

  Serial.println ("Sweep done");
}

void displayText(const char *text) {
  tft.fillScreen(ST77XX_BLACK);
  tft.setCursor(0, 0);
  tft.setTextColor(ST77XX_WHITE);
  tft.setTextWrap(true);
  tft.print(text);
}