Slow Boot times

[CrappyTan]

Hi,

I have an off situation here with your board running the sketch below.

Your board:

DevKit ESP32

Sketch

void setup() {
  Serial.begin(115200);
  Serial.print("I've been alive for ");
  Serial.print(millis());
  Serial.println("ms");

  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

I'm building a project which deep-sleeps, counts pulses with the ULP, wakes up after a set amount, logs on to wifi, publishes the counter with mqtt and goes back to sleep. The normal runtime on the devkit is around 300ms including wifi.

[33 ] ULP wakeup, saving pulse count [33 ] Pulse count from ULP:4 [33 ] Wifi Setup - Starting [68 ] Wifi Setup - Setting up WiFi Manager..... [69 ] Wifi Setup - Setting up WiFi Manager.....done [69 ] Got stored Credentials. Timeout 60s [70 ] Wifi Setup - Done [72 ] Wifi Setup - Connecting [75 ] Connecting to CrappyIoTconnected! Local IP: 337512970 [259 ] Setting up MQTT Starting [259 ] Attempting MQTT connection... [292 ] MQTT connected! [292 ] Leaving MQTT connect [292 ] Setting up MQTT Complete [296 ] Disconnecting from MQTT. [297 ] MQTT disconnected. [297 ] Finished. Going to sleep [297 ] Entering deep sleep

You can see that being alive and "useless" for 1500ms is a battery killer in this way :)

Why would it be taking this long before it actually hit the setup?

C

[UnexpectedMaker]

Do you have PSRAM enabled? If so, it does a RAM check on boot. Disable the PSRAM and see if that helps. Other than the extra RAM, there is no difference between a TinyPICO and any other ESP32 in terms of Booting.

[CrappyTan]

Ah yes. Found the option to disable PSRAM. Arduino IDE > Tools > PSRAM > Enable / Disabled

It now boots in 33ms :)

Thanks!