How to use the Bus Pirate v.3.6 as Sniffer?

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How to use the Bus Pirate v.3.6 as Sniffer?

Postby horia » Fri Nov 25, 2016 4:40 am

Hi,
I have a Bus Pirate v3.6 and use I2C between Bus Pirate and DSP /digital signal processor/ through
Dual Bidirectional I2C Bus Voltage-Level Translator/PCA9306/,i.e.3.3V to 1.3V and I use pull-up resistors = 2.2k.
In this case, a logical '0' is equal from 0V to 0.3V and logical '1' is equal from 1.0V to 1.2V.
Now I trying to use the Bus Pirate as I2C Logic analyzer with Logic Sniffer Java client.
Unfortunately, the Bus Pirate does not capture an I2C traffic.
Do I need to restore the SCL and SDA levels to the standard levels./ I mean to say Vdd= +3.3V/
If anyone has any experience to share it.
Thanks!
horia
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Re: How to use the Bus Pirate v.3.6 as Sniffer?

Postby horia » Sun Nov 27, 2016 12:25 pm

I tested the Bus Pirate as I2C Sniffer.For the test I used 3 different power supply :
1. Power supply = 5v --> working properly
2. Power supply = 3.3v --> working properly
3. Power supply = 1.3v --> did not work
horia
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