i2C is not multithreading safe

[fmuntean]

When using background threads to read the sensors and the main thread to update the screen the board hangs. A simple program like this hangs after few seconds:

#include <Arduino.h> #include <mbed.h>

#include <RGB_LED.h> #include <I2C.h> #include <HTS221Sensor.h>

Thread _background;

RGB_LED led;

DevI2C* i2c; HTS221Sensor* sensor; void setupSensor(){ i2c = new DevI2C(D14, D15); sensor = new HTS221Sensor(*i2c); //Temperature and Humidity Sensor sensor -> init(NULL); // init the sensor sensor -> enable();// enable // read id unsigned char id; sensor -> readId(&id); Serial.printf("HTS221 ID: %d\r\n", id); }

void readSensor(){ // get humidity float humidity, temperature; sensor -> getHumidity(&humidity); Serial.printf("Humidity: %.1f%%\n\r",humidity); // get temperature sensor -> getTemperature(&temperature); Serial.printf("Temperature: %.1fC\n\r",temperature); }

static void backgroundTask(){ while(1){ led.setColor(0,5,0); delay(500); led.turnOff(); delay(500);

readSensor();

} }

void setup(){ Serial.begin(115200);

Screen.init();

Screen.print("Setup");
setupSensor();
readSensor();
_background.start(&backgroundTask);

Screen.print("Setup Complete");

}

unsigned long uptime=0; void loop(){ Serial.println(uptime++); delay(1000); readSensor(); Screen.print(3,"..");

}

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