The Device(24LC512 EEPROM) releases SDA at 23us Included is a screen grab of a ACK, STOP, and Start. I don't see any separation between the ACK and the STOP? I would look at your device, when is your device releasing the ACK signal?

However, this is probably not an issue for most I2C slaves (but for mine ).Īfter the Ack clock period, the master does not pull the bus low during the next low period. This is not a repeated start, this is a stop followed by a start!

On the other hand, Wire library 'repeated start' is implemented as follows: The SDA line goes high and low when the SCL line is high. In the picture below you will see the specification of the repeated start:ĭo you see the difference? Exactly, in the specification, the SDA line goes high when the SCL line is low, and then, when SCL is high, SDA line goes low. Now, let's go to the I2C reference here: Repeated Start Condition – I2C Bus

While communicating with a LIS3MDL magnetometer. In the attached image, between the vertical lines of the analyser cursors, you can see the 'repeated start' condition of the function: Wire.endTransmission(false) I am having trouble communicating with an I2C slave implemented in an FPGA, so I checked what was going on in the SDA and SCL lines with a logic analiser. I am not so sure that repeated start has been implemented in the last release of the library.

Arduino wires library exxplained