Issue running in two different tasks Wifi and I2C device

[explorian]

Hi,

I don't know if it is a bug, however I have this situation on ESP32-WROOM-32D.

In the setup function I start 2 separated tasks. One task manages the connection to WiFi network with the "Wifi.h" library, after the Wifi connection completed the task stay IDLE with a infinite loop of delays.
The other task manages the I2C sensor DHT22; it essentially init the sensor and query it in a infinite loop and print the temperatures in the Serial terminal. The libraries used are "#Adafruit_Sensor.h, DHT.h, DHT_U.h".

The problem in this configuration is I get a sensor reading failure after some random number of successful readings (meanly 8-10).

This problem doesn't occur if I perform the same Wifi connection and sensor reading in the same task. I also tried to bind the two tasks on different cores, but I have the same problem.

Anyone may help me to figure out what can be wrong?

Regards

[mikemoy]

Anyone may help me to figure out what can be wrong?

without posting your code, probably not.

[explorian]

Sure:

Code: Untitled.cpp Select all

#include <Arduino.h>

#include <WiFi.h>

#include <Adafruit_Sensor.h>

#include <DHT.h>

#include <DHT_U.h>



// DHT sensor configuration

#define DHTPIN 16     // Digital pin connected to the DHT sensor 

#define DHTTYPE    DHT22     // DHT 22 (AM2302)



#define PRJ_DEFAULT_STACK_SIZE 8192



// wifi credentials

const char* ssid = "xxxxxxxxxxx";

const char* password = "yyyyyyyyyyyyyyyy";





void initWiFi() {

  WiFi.mode(WIFI_STA);

  WiFi.begin(ssid, password);

  Serial.print("Connecting to WiFi ..");

  while (WiFi.status() != WL_CONNECTED) {

    Serial.print('.');

    delay(1000);

  }

  Serial.println(WiFi.localIP());

}



void TaskInternetManager ( void * pvParameters ){



  Serial.print("Task TaskInternetManager running on core ");

  Serial.println(xPortGetCoreID());



  initWiFi();



  for(;;){

    Serial.println(WiFi.localIP());

    delay(10000);

  } 

}









DHT_Unified dht(DHTPIN, DHTTYPE);

uint32_t delayMS;



void initSensorsManager() {

    dht.begin();

    // Print temperature sensor details.

    sensor_t sensor;

    dht.temperature().getSensor(&sensor);

    Serial.println(F("------------------------------------"));

    Serial.println(F("Temperature Sensor"));

    Serial.print  (F("Sensor Type: ")); Serial.println(sensor.name);

    Serial.print  (F("Driver Ver:  ")); Serial.println(sensor.version);

    Serial.print  (F("Unique ID:   ")); Serial.println(sensor.sensor_id);

    Serial.print  (F("Max Value:   ")); Serial.print(sensor.max_value); Serial.println(F("°C"));

    Serial.print  (F("Min Value:   ")); Serial.print(sensor.min_value); Serial.println(F("°C"));

    Serial.print  (F("Resolution:  ")); Serial.print(sensor.resolution); Serial.println(F("°C"));

    Serial.println(F("------------------------------------"));

    // Print humidity sensor details.

    dht.humidity().getSensor(&sensor);

    Serial.println(F("Humidity Sensor"));

    Serial.print  (F("Sensor Type: ")); Serial.println(sensor.name);

    Serial.print  (F("Driver Ver:  ")); Serial.println(sensor.version);

    Serial.print  (F("Unique ID:   ")); Serial.println(sensor.sensor_id);

    Serial.print  (F("Max Value:   ")); Serial.print(sensor.max_value); Serial.println(F("%"));

    Serial.print  (F("Min Value:   ")); Serial.print(sensor.min_value); Serial.println(F("%"));

    Serial.print  (F("Resolution:  ")); Serial.print(sensor.resolution); Serial.println(F("%"));

    Serial.println(F("------------------------------------"));

    // Set delay between sensor readings based on sensor details.

    delayMS = sensor.min_delay / 1000;

}





void sensorLoop() {

  // Delay between measurements.

  delay(delayMS);

  // Get temperature event and print its value.

  sensors_event_t event;

  dht.temperature().getEvent(&event);

  if (isnan(event.temperature)) {

    Serial.println(F("Error reading temperature!"));

  }

  else {

    Serial.print(F("Temperature: "));

    Serial.print(event.temperature);

    Serial.println(F("°C"));

  }

  // Get humidity event and print its value.

  dht.humidity().getEvent(&event);

  if (isnan(event.relative_humidity)) {

    Serial.println(F("Error reading humidity!"));

  }

  else {

    Serial.print(F("Humidity: "));

    Serial.print(event.relative_humidity);

    Serial.println(F("%"));

  }

}



void TaskSensorsManager ( void * pvParameters ){

  Serial.print("Task TaskSensorsManager running on core ");

  Serial.println(xPortGetCoreID());

  initSensorsManager();



  for(;;){

    sensorLoop();

  } 

}









TaskHandle_t TaskInternetManagerHandle;

TaskHandle_t TaskSensorsManagerHandle;





void setup() {

  Serial.begin(115200);



  // Initialize device.

  Serial.println(F("HELLO WORLD"));



  xTaskCreatePinnedToCore( TaskInternetManager, "TaskInternetManager", PRJ_DEFAULT_STACK_SIZE, NULL, 1, &TaskInternetManagerHandle, 0);          /* pin task to core 0 */ 

  xTaskCreatePinnedToCore( TaskSensorsManager, "TaskSensorsManager", PRJ_DEFAULT_STACK_SIZE, NULL, 5, &TaskSensorsManagerHandle, 0);

  

  vTaskDelete(NULL);

}



void loop() {

}

[/code]

[explorian]

Up

[explorian]

up

[Sprite]

Just posting here to say that I don't see any obvious interference between the two... perhaps it's a problem in the dht driver not bein built for another task intercepting it? Possibly you could try running that task on a different core?