SPI-Python: Hardware SPI for RasPi from Python #piday #raspberrypi @Raspberry_Pi


Here’s a tutorial how to AVOID bit-banging and use the hardware via C (while still in Python), shared by Louis Thiery in the Adafruit Forums. And here is the code in Github.

This implementation of SPI in Python is hardware based. Linux-level C code is compiled as a Python module. I first learned how to get SPI working on the Raspberry Pi with help from a tutorial by Brian Hensley. However, I love Python and I wanted to use this hardware implementation of SPI from within Python. I little searching told me that what I wanted to do was to “extend” Python with C and so this reference was very helpful.

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  1. A little confused, how is this different from the SPI support that is already in occidentalis?

  2. There is a Python module for SPI called py-spidev. https://github.com/doceme/py-spidev

    I found it a few weeks ago when I was writing the Gertboard test suite in Python. IIRC it was Jeremy Blythe’s blog where I first heard about it. 🙂

    Not much documentation though, but I managed to get it working.

  3. Oh – this tutorial is supposed to explain how to NOT bit-bang SPI in Python…

    I didn’t know about the py-spidev before I wrote my library. It pretty much lines up exactly with what I did 😛

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