FreeRTOS single thread vs Function call

Question

Good day to everyone,

I am currently working on project using ATmega2560. I want to use threading, that is why I decided to use FreeRTOS. However, I cannot make one thread to work fine, so that I start writing second one. So, I have following code:

#include <stdlib.h>
#include <avr/wdt.h>
#include <Arduino_FreeRTOS.h>
#include <semphr.h>

void setup()
{
    pinMode(car_state_pin, INPUT);
    pinMode(battery_pin, INPUT);

    Serial.begin(9600);
    Serial2.begin(9600);
    Serial3.begin(9600);

    watchdogSetup(); //setup WD for 8 secs

    Serial.println("Create Tasks");

    Serial.flush();
    Serial2.flush();
    Serial3.flush();

    xTaskCreate(collect_data, (const portCHAR *) "GPS_Collect_Data", 128, NULL, 1, NULL);

    //collect_data(NULL);
}

And I have function collect_data which should run as thread:

void collect_data(void *pvParameters)
{

    (void)pvParameters;
    uint8_t len;
    char *tmp;

    for (;;)
    {
        millis_delay(2000);

        if (digitalRead(car_state_pin) == HIGH)
        {

            Serial.println("Collecting Data");
            tmp = (char *) calloc(50, sizeof(char));

            do
            {
                wdt_reset();
                len = gps_get_data(tmp);            
                Serial.println("Len < 15!");
                millis_delay(100);
            } while (strlen(tmp) < 15);


            /* Add imei and state of the car into the data string */
            len += sprintf(tmp + len, "%s,%d,%d", imei, digitalRead(car_state_pin), digitalRead(battery_pin));
            tmp[len] = 0;

#ifdef DEBUG
            Serial.print("TMP IS: ");
            Serial.println(tmp);

            Serial.print("Len is: ");
            Serial.println(len);
#endif

            free(tmp);
        }
    }
}

The problem is, this current code does not work properly, it resets automatically after printing "Collecting Data" and it just repeats forever (So output is:

Creating Tasks
Collecting Data
Creating Tasks
Collecting Data

and so on). However, when I comment xTaskCreate and do normal function call (uncomment the last line of setup), it works perfect. Can there be any reason, why thread wouldn't work as normal function call? I guessed maybe because of stacksize, but I've increased it and still no result.

FreeRTOS single thread vs Function call

0 Answers0