FAQ: I heard there is some issue with hardware SPI?

[Lazar Demin]

The Omega2 does not support full-duplex SPI transmissions. This is due to a hardware bug in the underlying MT7688 SoC used in the Omega2.

On the bright side, half-duplex SPI transmissions will work. We've done some work to improve the speed and stability of half-duplex transmissions, read more about it here.

When working with SPI on the Omega, we recommend:

• Using the python-spidev module
• Writing C code that directly uses the Linux spidev interface
  • General information can be found here: https://www.kernel.org/doc/Documentation/spi/spidev
  • And here is a good example of how it can be used: http://linux-sunxi.org/SPIdev#In_the_user_space

A few additional notes:

• The spi-tool utility and the pyOnionSpi module are deprecated and should not be used