![]() ![]() I☬ means Inter Integrated Circuit (it’s pronounced I-squared-C), and it is a synchronous, multi-master, multi-slave communication protocol. Introducing ESP32 I2C Communication Protocol Installing the ESP32 Board in Arduino IDE (Windows, Mac OS X, and Linux instructions).Follow the next tutorial to install the ESP32 on the Arduino IDE, if you haven’t already. We’ll program the ESP32 using Arduino IDE, so before proceeding with this tutorial you should have the ESP32 add-on installed in your Arduino IDE. ![]() Use Different I2C Pins with ESP32 (change default I2C pins).Serial.In this tutorial, we’ll cover the following concepts: Serial.printf("Register value: %04x\r\n", _builtin_bswap16(buf)) įor an explanation on why we need _builtin_bswap16(), see How to print 16-bit uint16_t as four hex digits in Arduino Option 2: Reading the register into an uint8_t array const uint8_t SLAVE_I2C_ADDRESS = 0b1010 Wire.requestFrom(SLAVE_I2C_ADDRESS, 2) // This register is 16 bits = 2 bytes longĭelay(5) // Wait for data to be available Wire.beginTransmission(SLAVE_I2C_ADDRESS) Option 1: Reading the register into an uint16_t (recommended) const uint8_t SLAVE_I2C_ADDRESS = 0b1010 Ĭonst uint16_t SLAVE_I2C_REGISTER_ADDRESS = 0x50 We will provide a full example with error handling in a followup post. This is a minimal example so it creates minimal confusion for the reader. Additionally, we wait for data using delay() instead of Wire.available(). Note that this code does not implement error handling for the sake of simplicity. In my opinion, it’s most efficient to just try out the standard way of reading a register and start from there. Note that some devices like the LAN9303 have a slightly different addressing scheme or other peculiarities. It will work with almost all I2C devices like EEPROMs, ADCs and others, provided you have the correct. ![]() ![]() The following code demonstrates how to read a register that is 2 bytes (16 bits) long over I2C. ![]()
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