[My I2C clock is pointy, is it normal ?]

Everything is in the title.
I am using an AT24C256 which i write and read with the Analog Discovery  Module RevC
I see on the Logic Analyser my clock is pointy and not squared. I am powering with the 5V power supply of the analog discovery and use 4.7kOhm resistor as pull up.

Is it normal I see the clock so pointy ?

[Confirming device to select in waveform]

Problem solved 

My device was not recognized by my PC. 

Fortunately I found this thread: 

 

 

[Confirming device to select in waveform]

Hello,

I am trying to use the device shown in the pictures attached to this thread. I am a bit lost in all the options proposed by the device manager especially when it comes to the subsection of the discovery. How do I know the sampling of this device etc...