While the Raspberry Pi has very good support for an I2C bus, a lot of very cool chips – including the in system programmer for just about every ATtiny and ATmega microcontroller – use an SPI bus.
The Onion SPI Library, libonionspi is a dynamic C library that provides functions to easily read from and write to devices communicating with the Omega over the GPIOs via the SPI protocol. The library ...
You might already have the hardware on hand to easily interface I2C and SPI devices with Python scripts on your computer. The board seen above is an FT-2232 breakout board. These chips are often used ...
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