400KHz I2C with Total Phase's Aardvark only transmits at 100KHz

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Pedro Gelabert
Pedro Gelabert 2017-10-2
回答： Pedro Gelabert 2017-10-5
I am able to use Total Phase's Aardvark I2C/SPI to send and read data with I2C. However, the transfers only occur at 100KHz with MatLab 2016b in Windows and macOS. I have setup my device as follows:
%%*** initialize i2c channel and unlock i2c slave access
Vendor = 'Aardvark';
BoardIndex = 0;
i2c_dev = i2c(Vendor,BoardIndex,RemoteAddress);
i2c_dev.BitRate = 400;
i2c_dev.PullupResistors = 'none';
i2c_dev.TargetPower = 'none';
set(i2c_dev,'OutputBufferSize',512)
fopen(i2c_dev);
Matlab reports the BitRate set at 400KHz, but proving the bus, all SCL clocks are 100KHz. How do I get to set the bitrate to 400KHz?
Using Total Phase's Control Center, I am able to send commands at 400KHz. Thus, the Aardvark can generate SCL clocks at 400KHz.
Thanks.

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回答（2 个）

Nikhil Sreekumar
Nikhil Sreekumar 2017-10-5
Hi Pedro,
Please refer to the bug report below. This addresses the issue that you are facing:
https://www.mathworks.com/support/bugreports/1472060
Thanks
Nikhil
Pedro Gelabert
Pedro Gelabert 2017-10-5
The workaround did not solve the issue. I managed to get MatLab 2017 and that transmits at 400KHz properly.

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