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I am currently using the Cheetah SPI Host Adapter as a master device and another device as a slave, which is controlled through SPI. When I use the Cheetah GUI, I successfully write commands to the slave. However, I need to write a Python script to execute this same write command without the GUI. What are my options? Is source code available?

Thanks for your question! All Total Phase products include royalty-free API software, including the Cheetah Software API.

API Resources

The API packages include many functional code samples in multiple software languages:  C, Python, Visual Basic, and cheetah .dll /.h/.c files.

Here is a summary of API scripts that you can use as is, or modify as needed for your specifications:

• detect - Detect Cheetah devices attached to the system.
• blast - Shift a running 8-bit counter via SPI.
• timing - Demonstrate the insertion of user defined delays in the middle of an SPI shifting sequence.
• eeprom - Read from or write to an SPI serial EEPROM, such as the Atmel AT25080A found on the Activity Board.
• flash - Read, write, verify, or erase a high-speed SPI flash memory. For early development, take a look at our SPI Flash demo board which includes the ST Micro M25P32
• async - Demonstrate the use of the advanced asynchronous SPI shifting API.

For you, the eeprom.py script could be a good starting point. It demonstrates how to read from or write to an SPI serial EEPROM. Additional tools to consider are our activity boards, such as the High-Speed SPI Flash Demo Board, which includes M25P32, high-speed low voltage flash memory. You can emulate the same to test, develop, and debug your slave device.

For a full set of tools, we also have the SPI Development Kit, which includes a Beagle I2C/SPI Protocol Analyzer, a High-Speed SPI Flash Demo Board, as well as the Cheetah SPI Host Adapter.

Here is an article to look at for more information about using API:

• How Do I Batch API Commands for High-Speed SPI Devices?

Here is an overview about using activity boards:

• Using Total Phase Development Boards to Streamline Debugging I2C, SPI, and CAN Systems

We hope this answers your question. Additional resources that you may find helpful include the following:

• Cheetah SPI Host Adapter User Manual
• Beagle Protocol Analyzer User Manual
• High-Speed Flash Demo Board User Manual
• SPI Background
• Knowledge Base

If you want more information, feel free to contact us with your questions, or request a demo that applies to your application.