ESP32 Forum

Posted: **Thu Feb 11, 2021 5:08 pm**

Hi
I'm quite new to the whole make based programming and IDF migrating from the arduino world so,

I'm trying to drive an I2C display using the u8g2_hal library and ss1306 display with an I2C ADC in two separate tasks and it seems like after both tasks start the ESP32 crashed with this error log:

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E (510) i2cdev: Could not read from device [0x48 at 0]: 263
E (510) ads111x: Could not read from register 0x01

I assume it's because the I2C display task tryes to use the bus while the adcRead task reads from it I've tries setting the I2C time out with :

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    i2c_set_timeout(I2C_NUM_0, 100000 / portTICK_RATE_MS);

no luck there and I can't find any function that checks if the I2C bus is being used so how can this be dealt with?

Posted: **Fri Feb 12, 2021 12:06 pm**

You should look into mutexes, see https://www.freertos.org/Real-time-embe ... texes.html.

Posted: **Sun Feb 14, 2021 2:12 pm**

I am using a binary mutex for the job but the I2C command probably works like shot and forget in the ESP32 meaning if I do u8g2_SendBuffer(&u8g2);

which updates the I2C display's buffer it still crashed before as after xSemaphoreGive(mutexBus); while updating the display it still uses the I2C for the display and runs it over with the I2C DAC communication.

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