![]() Wire. 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. After seeing ACK signal, the Master puts the data byte (0x23) on the I2C Bus and waits for the ACK signal to be generated on the Bus. ![]() The Master asserts address (0x37) of the Slave on the Bus and waits for the ACK to be generated on the Bus. I am an experienced assembler and C/C++ programmer and hardware developer/designer. The Master brings START condition on the I2C Bus. 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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