Those work fine for pulling data from registers that only hold and return 1 or 2 Bytes of signed & unsigned int data. Wire.requestFrom(BQ20Z45_Address,2,true) Wire.requestFrom(BQ20Z45_Address,1,true) My current sketch is using the following 3 functions to read registers over the Wire library on a Arduino Micro and its working perfectly.I’ll try to be as clear as I can, so lets start off with the first task I need help with. I have a working library that is successfully communicating with the battery management chip over i2c and I’m pulling most of the info I need but there are more registers I need help with accessing. Wire.I’m needing some help understanding how to communicate with a battery management system via i2c. Wire.write(val++) // sends potentiometer value byte Wire.write(byte(0x55)) // sends instruction byte Wire.beginTransmission(44) // transmit to device #44 (0x2c) Wire.begin() // join i2c bus (address optional for master) If I reduce the transmission to just the step #2 instruction single data byte, the same result is shown. The 2 data bytes are not being transmitted. The only byte I can see in my oscilloscope is just the first one (please see picture below). variable 1 test byte constantly incremented.first the I2C protocol device address - Start / 8 + 1bits.
work fine using standard Arduino libraries, the mentioned example doesn't work for me in my working NANO board. Although several I2C devices like DS3231 RTC, etc.
I am an experienced assembler and C/C++ programmer and hardware developer/designer. I just copied and reduced the code below a little from the example. Written by Nicholas Zambetti and Shawn Bonkowski, demonstrates use of the Wire library. I am starting to study the Wire library (no previous Arduino Wire library experience), I read some info taken from here.Īs you all know, this really simple example changes the value of a AD5171 digital potentiometer via I2C.
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