Unable to understand this i2c transaction

[nasher128]

Hi all.

I'm working with a device that I don't have the documentation for but I know it's an i2c device. I've captured the very first byte sent from the master and I really don't understand why the first clock pulse is wider than the rest. I'm trying to implement this using the teensyduino and I really want to understand why this is the case. I've uploaded an image of the transaction.

Could somebody please give me an insight please?

Thanks

[pylon]

I've captured the very first byte sent from the master and I really don't understand why the first clock pulse is wider than the rest.

That's not the first clock pulse, that's the start condition.

You might want to read the I2C documentation first before you start reverse-engineering unknown devices.