ESP32 WiFi forceSleepBegin

Projects Programming
1

Hey,

don't need WiFi at all, so I wanna turn it off, as much as possible.
Found some references that setting mode to OFF & forcing to sleep are doing the job.
Sadly I can't call the forceSleepBegin() method, as it's not found

Any ideas?

Thanks,
Recy

#include <WiFi.h>
...
// disable WiFi
  {
    WiFi.mode(WIFI_OFF); 
    WiFi.forceSleepBegin();
    delay(1);
  }

error: 'class WiFiClass' has no member named 'forceSleepBegin'

2

Why load #include <WiFi.h>, if you do not want WiFi?

Here is the API to the ESP32 WiFi Networking APIs - ESP32 - — ESP-IDF Programming Guide latest documentation

You will find that the ESP32 API does not contain a forceSleepBegin() method.

3

I didn't found any reference about it would be guaranteed that, when not including WiFi.h, no power will be consumed. So, to be sure I'm running on a minimum power level, I'm trying to disable as much as possible.

4

ESP32 runs FreeRTOS, and the WiFi is always run on core number 1 (the other being 0).
It seems possible to force core 1 not to run, thus no WiFi, but not from the Arduino IDE. See here for (little) more.

Futher search leads here, so maybe it's possible after all:

/*Simple example of multi loop
* By Evandro Luis Copercini
* Based on pcbreflux video
* Public domain license 2017
*/

#if CONFIG_FREERTOS_UNICORE
#define ARDUINO_RUNNING_CORE 0
#else
#define ARDUINO_RUNNING_CORE 1
#endif

void loop1(void *pvParameters) {
  while (1) {
     Serial.println("loop1");
     delay(1000);
  }
}

void loop2(void *pvParameters) {
  while (1) {
     Serial.println("loop2");
     delay(300);
  }
}

void loop3(void *pvParameters) {
  while (1) {
     Serial.println("loop3");
     delay(4000);
  }
}

void setup() {
  Serial.begin(115200);
  xTaskCreatePinnedToCore(loop1, "loop1", 4096, NULL, 1, NULL, ARDUINO_RUNNING_CORE);
  xTaskCreatePinnedToCore(loop2, "loop2", 4096, NULL, 1, NULL, ARDUINO_RUNNING_CORE);
  xTaskCreatePinnedToCore(loop3, "loop3", 4096, NULL, 1, NULL, ARDUINO_RUNNING_CORE);
}

void loop() {
   Serial.println("loop0");
   delay(5000);
}

Tasks loop1, loop2 and loop3 are supposed to run on core 1. But if you set

#define ARDUINO_RUNNING_CORE 0

maybe these tasks won't run at all and the serial monitor will only show "loop0"

Edit: no, it's not that simple...
But I think it is possible to set this option using the ESP IDF configuration menu. The guide for the ESP-IDF is here.