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protocol waveform errors


milu

Question

hey folks

im looking for the help regarding the issue am facing ; im getting error signal while plotting i2c info in logic and protocol mode. especially in logic mode, scl and sda wave forms are irregular and seems kinda error. not sure why . please help me out .

thanks 

rdwaveforms.JPG

digilentmaini2c.JPG

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Hi @milu

In Logic Analyzer set higher sample rate, more than double of the I2C frequency.

The Errors in Protocol/I2C/Spy are probably due noisy signals, ringing or crosstalk:
- make sure to have proper ground connection connection between the devices
- twist the SCL/SDA wires with ground to provide some signals isolation
- check the FreqFilter option, to filter out ringing
- inspect the signals in Logic Analyzer with high (100MHz) sample rate

In newer software version you can find Slave option in Protocol/I2C.

 

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