The I2C/TWI stuff uses 7 bit addresses (even if the address fits into 6!) and depending on a read or write action, shifts it up one bit and ORs in a 1 (for read) or a 0 (for write) to the lowest bit, bit 0, giving the two 8 bit addresses, one for reading and one for writing.

It actually is a 6 bit address, while the following 0x7F is data. I am aware of the 7 bit address limits and so I believe the 0x37 I am sending is a valid address. Wire.begin() // join i2c bus (address optional for master) All suggestions are welcome and most likely it’s something that I am forgetting although all the sample code I’ve viewed does not show me anything I am missing. I’m working on a development board and my EE says that it looks like a software issue. I’ve tried everything I can think of including setting the clock rate but the second and third byte are no where to be seen. When I run the following code I only see one byte of transmission on an oscilloscope over and over (every 100 ms). I’m having trouble with the wire library. I’m working in Visual Studio Code with the Platform io extension on a Mega 2560. Serial.Hi, Last month my password word was stolen from my Arduino account and they have temporarily blocked me out so I thought to post my question here. Serial.print(digitalRead(PIN_SCL)) //should be HIGH

Just put the GPIO (and SDA) to low for some time.ĭoesn't work to change the SDA pin directly to output and write LOW Parallel to a GPIO and check, if the error condition occurs. SDA data line held low ').Īnd want to share it in the first Google result: I connect SDA The SCL line was high, but SDA was being heldĮrror. Problem with a stuck I2C bus on startup (hangs at Well, it's an old issue, but i had the same Update 1 st August 2017 – fix for error 3 (' I2Cīus error. With I2C_ClearBus.cpp and I2C_ClearBus.h files, modified to work with Nov 2022 – added link to I2C_ClearBus.zip Why the Arduino Wire library is not enough. Reliable Startup for I2C Battery Backed RTC Reliable Startup for I2C Battery Backed RTC Why the Arduino Wire library is not enough.

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