SleepyDog with WavFilePlayer Example Not Working

[Casey10110]

I'm trying to figure out why Adafruit's branch of this library is failing when using the SleepyDog library with a Feather M4 Express (SAMD51). When I replace the delays in the WavFilePlayer example code with Watchdog.sleep(500), it crashes after a few cycles and ceases to sleep. Any idea what is preventing it from sleeping? It's like something is triggering the _WFI() before the WDT is able to ...

`

include

include

include

include

include

include

AudioPlaySdWav playWav1; // Use one of these 3 output types: Digital I2S, Digital S/PDIF, or Analog DAC AudioOutputI2S audioOutput; AudioConnection patchCord1(playWav1, 0, audioOutput, 0); AudioConnection patchCord2(playWav1, 1, audioOutput, 1); AudioControlSGTL5000 sgtl5000_1;

// Use these with the Teensy Audio Shield

define SDCARD_CS_PIN 10

define SDCARD_MOSI_PIN 7

define SDCARD_SCK_PIN 14

// Use these with the Teensy 3.5 & 3.6 SD card //#define SDCARD_CS_PIN BUILTIN_SDCARD //#define SDCARD_MOSI_PIN 11 // not actually used //#define SDCARD_SCK_PIN 13 // not actually used

// Use these for the SD+Wiz820 or other adaptors //#define SDCARD_CS_PIN 4 //#define SDCARD_MOSI_PIN 11 //#define SDCARD_SCK_PIN 13

void setup() { Serial.begin(9600);

// Audio connections require memory to work. For more // detailed information, see the MemoryAndCpuUsage example AudioMemory(8);

// Comment these out if not using the audio adaptor board. // This may wait forever if the SDA & SCL pins lack // pullup resistors sgtl5000_1.enable(); sgtl5000_1.volume(0.5);

SPI.setMOSI(SDCARD_MOSI_PIN); SPI.setSCK(SDCARD_SCK_PIN); if (!(SD.begin(SDCARD_CS_PIN))) { // stop here, but print a message repetitively while (1) { Serial.println("Unable to access the SD card"); delay(500); } } }

void playFile(const char *filename) { Serial.print("Playing file: "); Serial.println(filename);

// Start playing the file. This sketch continues to // run while the file plays. playWav1.play(filename);

// A brief delay for the library read WAV info delay(5);

// Simply wait for the file to finish playing. while (playWav1.isPlaying()) { // uncomment these lines if you audio shield // has the optional volume pot soldered //float vol = analogRead(15); //vol = vol / 1024; // sgtl5000_1.volume(vol); } }

void loop() { playFile("SDTEST1.WAV"); // filenames are always uppercase 8.3 format Watchdog.sleep(500); playFile("SDTEST2.WAV"); Watchdog.sleep(500); playFile("SDTEST3.WAV"); Watchdog.sleep(500); playFile("SDTEST4.WAV"); Watchdog.sleep(500); }`

[Casey10110]

The issue does not appear to have to do with Watchdog, as now I am getting crashes using delay() as well ...

[Casey10110]

Cancel that, I actually had a sleep in there next to the delay that I oversaw, and that is causing the crash. I am also now using:

AudioInterrupts(); Watchdog.sleep(500); NoAudioInterrupts();

and this doesn't seem to help.

[FrankBoesing]

Please ask Adafruit. This variant of the library is not written for that CPU. I doubt anyone here can help you.

[Casey10110]

OK, I did but haven't received any response. Thank you, Frank!

[FrankBoesing]

The library needs interrupts - it's likely they wake the CPU.

[Casey10110]

For sure Frank, I've tried to get rid of them all but not yet to any avail. NVIC_DisableIRQ(DMAC_0_IRQn); crashes the sleep function entirely. I've reposted in the Adafruit forum we'll see what they say ...

[Casey10110]

To update, it appears this works:

`// Minimal Crashing Example // Sleep crashes after a certain (seemingly random) number of cycles

include

include

include

AudioPlayFSWav playFSWav; AudioOutputI2S audioOutput; AudioConnection patchCord1(playFSWav, 0, audioOutput, 1); AudioConnection patchCord2(playFSWav, 1, audioOutput, 0);

void setup() { pinMode(LED_BUILTIN, OUTPUT); digitalWrite(LED_BUILTIN, HIGH); // Show we're awake Serial.begin(115200); while(!Serial); // wait for Arduino Serial Monitor (native USB boards) Serial.println("Crash Demo!"); Serial.println(); }

//watch the regular pattern change after a certain number of cycles (sleep drops out) void loop() { Serial.println("Going to sleep in one second..."); AudioNoInterrupts(); DMAC->Channel[0].CHCTRLA.bit.ENABLE = 0; Watchdog.sleep(64); // Sleep for 64 ms, this drops out after a while OSCCTRL->DFLLVAL.reg = OSCCTRL->DFLLVAL.reg; while ( OSCCTRL->DFLLSYNC.bit.DFLLVAL ); DMAC->Channel[0].CHCTRLA.bit.ENABLE = 1; AudioInterrupts(); digitalWrite(LED_BUILTIN, LOW); // Show we're asleep AudioNoInterrupts(); DMAC->Channel[0].CHCTRLA.bit.ENABLE = 0; Watchdog.sleep(64); // Sleep for 64 ms, this drops out after a while OSCCTRL->DFLLVAL.reg = OSCCTRL->DFLLVAL.reg; while ( OSCCTRL->DFLLSYNC.bit.DFLLVAL ); DMAC->Channel[0].CHCTRLA.bit.ENABLE = 1; AudioInterrupts(); digitalWrite(LED_BUILTIN, HIGH); // Show we're awake again } `