21 August 2013
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2
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Today I was trying to get a Netduino 2 .NET Micro Framework microcontroller board to communicate with the ADC Pi board which we build and sell for the Raspberry Pi.
Initially, the boards didn't seem to communicate so I tried to monitor the I2C signals using my Agilent MSOX2024A Oscilloscope which I purchased last month using the digital inputs which allowed me to see the clock and data lines on the SCL and SDA pins. The oscilloscope has a serial locked option for "embedded serial triggering and analysis (I²C, SPI) application" which is an extra £280 to buy. Agilent offer a 30-day free trial to unlock the extra functionality so I applied for a trial license which was processed in a few minutes and was easily installed via a USB stick.
After restarting the oscilloscope the Serial button (which seems to have a LED bug) was enabled and the data from the I2C bus was decoded in real-time on the display. This seems to be a much easier way to monitor changes to the data than using my USB logic analyser which only captures a few seconds of data each time.
The screenshots below show the data on channels 1 & 2 and the decoded HEX data below.
Two data packets are shown on the display
Zoomed into show a single data packet on the display
Two data packets shown on the display with the Lister display active
Single data packet shown on the display with the Lister display active
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