![]() I found out that removing Wire.begin() from the class initialize function and putting it in setup() function of the main. This code works perfectly on Arduino UNO but when I upload it to the Due the serial commands don't show in the serial monitor. I have some serial debug commands within my main. I included the wire library in the cpp file of the library ( #include ) and then the initialize function of the class made the board join the bus as a master using Wire.begin(). I wrote a library to communicate to a sensor using I2C using the Wire library. ![]() 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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