Ni 8452 I2C SCL

[johndalton]

Hi,

I have ni 8452 and i am working I2C. My problem is that I send example c code to device but i don't observe any clock waveform or data on oscilloscope. Can you help me? How can i see clock waveform. Also, i use pull up resistor.

Thanks. 

[crossrulz]

What pull-up value are you using?  To what voltage?  What device are you trying to communicate with?  Do you have any shorts or loads to ground on the line?

Assuming everything is up to specification, you should be able to just probe directly on the line with an oscilloscope.  I recommend triggering on a falling edge.

[johndalton]

Thanks for reply

Pull up value is disable.

Reference voltage is 3.3V and i use 3.3 kohm resistor value to connect.

I just want to observe clock value, I don't try to communicate any device.

I did falling edge but I don't still observe any changes.