Teensy 3.2 PropShield no Audio

**molleonair** · 02-08-2021, 04:19 PM

Hello ....

Iam Newbie in Teensy Audio and I just want to test
the Hardware i have a teensy 3.2 with a PJIRC PropShield (DAC1 Output)

but nothing happens

Can you check if code is correct

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thanks a lot

Code:

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

// GUItool: begin automatically generated code
AudioPlaySerialflashRaw  playFlashRaw1;  //xy=845.3333129882812,330.33331298828125
AudioOutputAnalog        dac1;           //xy=1028.3333282470703,328.3333282470703
AudioConnection          patchCord1(playFlashRaw1, dac1);
// GUItool: end automatically generated code


void setup() {
  Serial.begin(9600);
  AudioMemory(20);
  dac1.analogReference(EXTERNAL); // much louder!
  delay(50);             // time for DAC voltage stable
  pinMode(5, OUTPUT);
  digitalWrite(5, HIGH); // turn on the amplifier
  delay(10);             // allow time to wake up
}

void loop() {
//Serial.println("BIG");
//playFlashRaw1.play("BIG.RAW");
//delay(2000);
//Serial.println("INTEL");
//playFlashRaw1.play("INTEL.RAW");
//delay(2000);
Serial.println("SOX");
playFlashRaw1.play("SOX.RAW");
delay(2000);
}

**GremlinWrangler** · 02-09-2021, 09:12 AM

Does this hardware work if you do a basic sinewave out the dac1? and since you can connect multiple outputs to a single source if you have a spare PWM capable pin you can try adding one there and connecting a resistor+LED to it and look for brightness changes as audio plays?

You can also run the DAC test at https://www.pjrc.com/teensy/teensy31.html (remember to add the write to pin 5 to enable the speaker).

The DAC driver is fragile so if it has become shorted at anypoint the hardware may be dead.

**PaulS** · 02-09-2021, 09:41 AM

Probably superfluous, but did you solder those 5 pins in the red circle as well?

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Paul

**molleonair** · 02-09-2021, 02:29 PM

Originally Posted by PaulS

Probably superfluous, but did you solder those 5 pins in the red circle as well?

Paul

yes i did and the sine-wave works

**PaulS** · 02-09-2021, 02:54 PM

Originally Posted by molleonair

the sine-wave works

Good, so the hardware seems to be OK then.
So the issue is playing the .raw file, either the file itsself or the audio library.
Did you try the WaveFilePlayer example using an ordinary 44.1kHz/16bit .wav file?

Paul

**molleonair** · 02-09-2021, 03:02 PM

Hi Paul thnx for Help

i found the Problem

i add
SerialFlash.begin (6);
to setup and it works

it was realy difficult to find this in the Web
Maybe someone should add an Example in Arduino Teensy Audio Folder

but now i have to add Fastled to this Teensy and i dont understand when i have to deselect the SerialFlash CS Line (Pin6)
and Select the PIN7 to enable Fastled Data on Prop Shield cause they connected to the same SPI Signals

i want play a sound file and update LED Matrix while playing this file

may you have a tip for me

**MichaelMeissner** · 02-09-2021, 04:33 PM

Originally Posted by molleonair

Hi Paul thnx for Help

i found the Problem

i add
SerialFlash.begin (6);
to setup and it works

it was realy difficult to find this in the Web
Maybe someone should add an Example in Arduino Teensy Audio Folder

but now i have to add Fastled to this Teensy and i dont understand when i have to deselect the SerialFlash CS Line (Pin6)
and Select the PIN7 to enable Fastled Data on Prop Shield cause they connected to the same SPI Signals

i want play a sound file and update LED Matrix while playing this file

may you have a tip for me

I ran into problems switching back and forth between using the SPI device (in my case it was driving two ST7735 displays) and using the prop shield for doing ws2812b/neopixels.

Here is the thread where it was discussed, and Paul S. and KurtE's answers:

https://forum.pjrc.com/threads/46640...D1351-displays

This is the code that I use in a wrapper function around the basic neopixel objects. I don't think I've used this in some time, so the code may have bit-rotted.

Code:

#ifdef SPI_HAS_TRANSACTION

// Return true if the pin is one of the special SPI0 pins for ouptut
static inline bool
is_spi0_pin (Neopixel_pin_t pin)
{
  if (pin < 0)
    return false;

#if PROCESSOR_TEENSY_ARM
  switch (pin)
    {
    default:
      break;

#if PROCESSOR_TEENSY_3_5 || PROCESSOR_TEENSY_3_6
    case 27:			// 3.5/3.6 alternate SCLK0
    case 28:			// 3.5/3.6 alternate MOSI0
#endif
    case  7:			// alternate MOSI0
    case 11:			// normal MOSI0
    case 13:			// normal SCLK
    case 14:			// alternate SCLK
      return true;
    }
#endif

  return false;
}

#endif

// display the pixels and possibly blink the LED

void
Neopixel_object::show (void)
{
  if (lowlevel)
    {
#ifdef SPI_HAS_TRANSACTION
      bool pin_spi_p  = do_spi_reserve && is_spi0_pin (pin_neopixel);
      bool pin2_spi_p = do_spi_reserve && is_spi0_pin (pin_neopixel2);

      if (do_spi_reserve)
	{
	  // beginTransaction prevents SPI bus conflicts
	  // We need to reset 11 & 13 to being digital pins
	  // https://forum.pjrc.com/threads/46640-Neopixels-with-SPI-transactions-on-prop-shield-working-with-ST7735-SSD1351-displays
	  SPI.beginTransaction (SPISettings(24000000, MSBFIRST, SPI_MODE0));

	  if (pin_spi_p)
	    pinMode (pin_neopixel, OUTPUT);

	  if (pin2_spi_p)
	    pinMode (pin_neopixel2, OUTPUT);

	  // Doing uncanny eyes, we need a slight delay after doing the beingTransaction so that the first LED doesn't glitch
	  if (do_spi_delay)
	    delay (do_spi_delay);
	}
#endif

      if (pin_enable >= 0)
	digitalWrite (pin_enable, HIGH);

      lowlevel->show ();

      if (do_blink)
	blink ();

      if (pin_enable >= 0)
	digitalWrite (pin_enable, LOW);

#ifdef SPI_HAS_TRANSACTION
      if (do_spi_reserve)
	{
	  // allow other libs to use SPI again
	  SPI.endTransaction ();

#if PROCESSOR_TEENSY_3_X || PROCESSOR_TEENSY_LC
	  if (pin_spi_p)
	    {
	      volatile uint32_t *reg = portConfigRegister (pin_neopixel);
	      *reg = PORT_PCR_MUX (2);
	    }

	  if (pin2_spi_p)
	    {
	      volatile uint32_t *reg = portConfigRegister (pin_neopixel2);
	      *reg = PORT_PCR_MUX (2);
	    }

#elif PROCESSOR_TEENSY_4_x
	  if (pin_spi_p || pin_spi2_p)
	    Serial.println ("Need to add Teensy 4.0 transaction support");
#endif

	}
#endif
    }
  else
    abort_with_message ("Neopixel_object::show, no lowlevel neopixel");
}

Here is the code that sets the various PROCESSOR_TEEENSY macros:

Code:

#if defined(__MK20DX128__)
#define PROCESSOR_TEENSY_3_0		1
#define PROCESSOR_TEENSY_3_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 3.0"

#elif defined(__MK20DX256__)
#define PROCESSOR_TEENSY_3_1		1	// 3.1 and 3.2 are identical except for the voltage regulator
#define PROCESSOR_TEENSY_3_2		1
#define PROCESSOR_TEENSY_3_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 3.2"

#elif defined(__MKL26Z64__)
#define PROCESSOR_TEENSY_LC		1
#define PROCESSOR_NAME			"PJRC Teensy LC"

#elif defined(__MK64FX512__)
#define PROCESSOR_TEENSY_3_5		1
#define PROCESSOR_TEENSY_3_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 3.5"

#elif defined(__MK66FX1M0__)
#define PROCESSOR_TEENSY_3_6		1
#define PROCESSOR_TEENSY_3_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 3.6"

#elif defined(__IMXRT1052__)
#define PROCESSOR_TEENSY_4_BETA1	1
#define PROCESSOR_TEENSY_4_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 4.0 Beta1"

#elif defined(__IMXRT1062__)
#define PROCESSOR_TEENSY_4		1
#define PROCESSOR_TEENSY_4_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1

#if defined(ARDUINO_TEENSY40)
#define PROCESSOR_TEENSY_4_0		1
#define PROCESSOR_TEENSY_4_1		1
#define PROCESSOR_NAME			"PJRC Teensy 4.0"

#elif defined(ARDUINO_TEENSY41)
#define PROCESSOR_TEENSY_4_0		0
#define PROCESSOR_TEENSY_4_1		1
#define PROCESSOR_NAME			"PJRC Teensy 4.1"

#else
#define PROCESSOR_TEENSY_4_0		0
#define PROCESSOR_TEENSY_4_1		0
#define PROCESSOR_NAME			"PJRC Teensy 4.x"
#endif

#else
#warning "Unknown Teensy, fix Meissner_Config_Teensy.h"
#define PROCESSOR_NAME			"PJRC Unknown Teensy"
#endif

**molleonair** · 02-09-2021, 04:45 PM

Originally Posted by MichaelMeissner

I ran into problems switching back and forth between using the SPI device (in my case it was driving two ST7735 displays) and using the prop shield for doing ws2812b/neopixels.

Here is the thread where it was discussed, and Paul S. and KurtE's answers:

https://forum.pjrc.com/threads/46640...D1351-displays

This is the code that I use in a wrapper function around the basic neopixel objects. I don't think I've used this in some time, so the code may have bit-rotted.

Code:

#ifdef SPI_HAS_TRANSACTION

// Return true if the pin is one of the special SPI0 pins for ouptut
static inline bool
is_spi0_pin (Neopixel_pin_t pin)
{
  if (pin < 0)
    return false;

#if PROCESSOR_TEENSY_ARM
  switch (pin)
    {
    default:
      break;

#if PROCESSOR_TEENSY_3_5 || PROCESSOR_TEENSY_3_6
    case 27:			// 3.5/3.6 alternate SCLK0
    case 28:			// 3.5/3.6 alternate MOSI0
#endif
    case  7:			// alternate MOSI0
    case 11:			// normal MOSI0
    case 13:			// normal SCLK
    case 14:			// alternate SCLK
      return true;
    }
#endif

  return false;
}

#endif

// display the pixels and possibly blink the LED

void
Neopixel_object::show (void)
{
  if (lowlevel)
    {
#ifdef SPI_HAS_TRANSACTION
      bool pin_spi_p  = do_spi_reserve && is_spi0_pin (pin_neopixel);
      bool pin2_spi_p = do_spi_reserve && is_spi0_pin (pin_neopixel2);

      if (do_spi_reserve)
	{
	  // beginTransaction prevents SPI bus conflicts
	  // We need to reset 11 & 13 to being digital pins
	  // https://forum.pjrc.com/threads/46640-Neopixels-with-SPI-transactions-on-prop-shield-working-with-ST7735-SSD1351-displays
	  SPI.beginTransaction (SPISettings(24000000, MSBFIRST, SPI_MODE0));

	  if (pin_spi_p)
	    pinMode (pin_neopixel, OUTPUT);

	  if (pin2_spi_p)
	    pinMode (pin_neopixel2, OUTPUT);

	  // Doing uncanny eyes, we need a slight delay after doing the beingTransaction so that the first LED doesn't glitch
	  if (do_spi_delay)
	    delay (do_spi_delay);
	}
#endif

      if (pin_enable >= 0)
	digitalWrite (pin_enable, HIGH);

      lowlevel->show ();

      if (do_blink)
	blink ();

      if (pin_enable >= 0)
	digitalWrite (pin_enable, LOW);

#ifdef SPI_HAS_TRANSACTION
      if (do_spi_reserve)
	{
	  // allow other libs to use SPI again
	  SPI.endTransaction ();

#if PROCESSOR_TEENSY_3_X || PROCESSOR_TEENSY_LC
	  if (pin_spi_p)
	    {
	      volatile uint32_t *reg = portConfigRegister (pin_neopixel);
	      *reg = PORT_PCR_MUX (2);
	    }

	  if (pin2_spi_p)
	    {
	      volatile uint32_t *reg = portConfigRegister (pin_neopixel2);
	      *reg = PORT_PCR_MUX (2);
	    }

#elif PROCESSOR_TEENSY_4_x
	  if (pin_spi_p || pin_spi2_p)
	    Serial.println ("Need to add Teensy 4.0 transaction support");
#endif

	}
#endif
    }
  else
    abort_with_message ("Neopixel_object::show, no lowlevel neopixel");
}

Here is the code that sets the various PROCESSOR_TEEENSY macros:

Code:

#if defined(__MK20DX128__)
#define PROCESSOR_TEENSY_3_0		1
#define PROCESSOR_TEENSY_3_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 3.0"

#elif defined(__MK20DX256__)
#define PROCESSOR_TEENSY_3_1		1	// 3.1 and 3.2 are identical except for the voltage regulator
#define PROCESSOR_TEENSY_3_2		1
#define PROCESSOR_TEENSY_3_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 3.2"

#elif defined(__MKL26Z64__)
#define PROCESSOR_TEENSY_LC		1
#define PROCESSOR_NAME			"PJRC Teensy LC"

#elif defined(__MK64FX512__)
#define PROCESSOR_TEENSY_3_5		1
#define PROCESSOR_TEENSY_3_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 3.5"

#elif defined(__MK66FX1M0__)
#define PROCESSOR_TEENSY_3_6		1
#define PROCESSOR_TEENSY_3_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 3.6"

#elif defined(__IMXRT1052__)
#define PROCESSOR_TEENSY_4_BETA1	1
#define PROCESSOR_TEENSY_4_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1
#define PROCESSOR_NAME			"PJRC Teensy 4.0 Beta1"

#elif defined(__IMXRT1062__)
#define PROCESSOR_TEENSY_4		1
#define PROCESSOR_TEENSY_4_X		1
#define PROCESSOR_TEENSY_3_OR_4_X	1
#define PROCESSOR_TEENSY_ARM		1

#if defined(ARDUINO_TEENSY40)
#define PROCESSOR_TEENSY_4_0		1
#define PROCESSOR_TEENSY_4_1		1
#define PROCESSOR_NAME			"PJRC Teensy 4.0"

#elif defined(ARDUINO_TEENSY41)
#define PROCESSOR_TEENSY_4_0		0
#define PROCESSOR_TEENSY_4_1		1
#define PROCESSOR_NAME			"PJRC Teensy 4.1"

#else
#define PROCESSOR_TEENSY_4_0		0
#define PROCESSOR_TEENSY_4_1		0
#define PROCESSOR_NAME			"PJRC Teensy 4.x"
#endif

#else
#warning "Unknown Teensy, fix Meissner_Config_Teensy.h"
#define PROCESSOR_NAME			"PJRC Unknown Teensy"
#endif

Ok thats too much for me ...
iam newbee and dont know how to use wrapper code

maybe i try Pauls WS2812 non Blocking lib
i think it could work cause it uses serial ports to send the data stream
its not easy for me but i try

thnx so much to all of you

**MichaelMeissner** · 02-09-2021, 05:28 PM

Originally Posted by molleonair

Ok thats too much for me ...
iam newbee and dont know how to use wrapper code

The wrapper code is just a class that I have that has the neopixel data structure as a member, plus some other elements, such as the pins used, etc.

Basically you need something like this:

Code:

  // beginTransaction prevents SPI bus conflicts
  // We need to reset pins 11/13 to be normal digital pins
  // https://forum.pjrc.com/threads/46640-Neopixels-with-SPI-transactions-on-prop-shield-working-with-ST7735-SSD1351-displays
  SPI.beginTransaction (SPISettings(24000000, MSBFIRST, SPI_MODE0));
  pinMode (11, OUTPUT);
  pinMode (13, OUTPUT);
  delay (10);                        // possibly we need a small delay

  // Enable LEDs
  digitalWrite (7, HIGH);

  // Do the show function
  pixels.show ();

  // Wait for any SPI transactions to finish
  SPI.endTransaction ();

  // Reset pins 11/13 to be SPI mode
  volatile uint32_t *pin11 = portConfigRegister (11);
  *pin11 = PORT_PCR_MUX (2);

  volatile uint32_t *ping13 = portConfigRegister (13);
  *pin13 = PORT_PCR_MUX (2);

  // Disable LEDs
  digitalWrite (7, HIGH);

  delay (10);                        // possibly we need a small delay

Originally Posted by molleonair

Ok thats too much for me ...
maybe i try Pauls WS2812 non Blocking lib
i think it could work cause it uses serial ports to send the data stream
its not easy for me but i try

thnx so much to all of you

Or just don't use the prop shield to do the level shifting and use some pin other than 11 or 13. But you need to test whether the pin will work with 3.3v data signals. Many newer ws2812b/neopixels will work with 3.3v signals, some won't (particularly older designs). I think the SK6812 based LEDs will work with 3.3v.

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