I sprung for something a bit different and I think I'm now paying for it :/
The RA8875 is an attractive device ( SPI and I2C ) but looks like very lil support for these units.
I bought the BuyDisplay TFTM070-5
( Link to Datasheet and some "example code" on manufacturers site ).
Out of the box it wasn't set for SPI so I had to use the settings from the Datasheet:
4 Wire SPI:
J9, J11, J13, J15 - Open
J10, J12, J14, J16 - Short
R1, R2, R3 - 10K
R35, R36, R37, R38 - 0R00
R39, R40, R41, R42 - NC
So far I had no luck even with the Adafruit RA8875 Library and examples.
Connections are as follows :
TFT Pin -> Arduino Due SPI Pin - Function
5 -> 6 - CS ( SCS)
6 -> 4 - MOSI (SDO)
7 -> 1 - MISO (SDI)
8 -> 3 - CLK (SCLK)
As you can see the chip select is pulled low, but not sure if that's done right or not.
Any constructive input is welcome.
There is a 128MBit flash on the unit as well.