I have been working with your Aardvark I2C/SPI Host Adapter and it’s been working great on all my projects. I have a question for you.
Using the Aardvark adapter for SPI, I programmed a script in python to handle a more complex communication with a µC-System. Here is the problem I want to solve:
Here’s the diagram of what I need to fix:
Response from Technical Support:
Thanks for your question! The project may be complex, but in this case the solution is simple: an external pull-up resistor.
In general, the Aardvark adapter starts driving the SPI clock only where a transactions occurs. Until then, that signal may be in high impedance tri-state mode. With a pull-up resister attached from the SPI clock line to VCC, the Aardvark adapter will detect a logical ‘1’ and then start driving the SPI clock. You won’t need much current – a 100k resistor should do the job.
For more information, please refer to section Pin Driving of the Aardvark I2C/SPI Host Adapter User Manual.
Additional resources that you may find helpful include the following:
We hope this answers your questions. If you have other questions about our protocol analyzers or other Total Phase products, feel free to email us at sales@totalphase.com, or if you already own one of our devices and have a technical question, please submit a request for technical support.