It is possible to run SPI at low MHz speed with just Sketch language on Galileo Gen 2 Arduino board. The amount of data is 16 bit x 320 x 240 pixels = 1228800 bit. The speed is OK for slow full screen updates (0.42 sec update for full screen). For example, if some measurement data has to be shown on small screen.

 

https://www.youtube.com/watch?v=66IiiLOHqlA

 

The sketch is on GitHub

https://gist.github.com/khwas/e336bddf10191ddfd0a5

Fixed one missing ASCII symbol

Fixed one missing ASCII symbol