Dan East
A first port of the excellent Adafruit ST7735 library Also supports the S6D02A1 controller (Use 1k resistors in series on all logic lines).
Fork of
Adafruit_ST7735
by 
Andrew Lindsay
Modified version of the ST7735 library to support the Samsung S6D02A1 controller. These 1.8" 128x160 displays can be purchased dirt cheap (under $5 on eBay or aliexpress with free shipping).
You must also import the Adafruit_GFX library, as this library is dependent upon it.
I've used up to 20 MHz SPI with no problem. That is hardcoded in the library, and is currently set to 4 MHz (unmodified from the original library).
The library is exactly the same for S6D02A1 and ST7735 except for the initialization routines.
Use 1k resistors in series on all 5 logic lines as 3V3 is required (display is not damaged by 5V logic, but it will not work)
Constructor pin names that match the S6D02A1: Adafruit_ST7735(DIN, NC, CLK, CD, D/C, RST) ;
Source of initialization codes for the S6D02A1: https://github.com/zigwart/Adafruit_QDTech/blob/master/Adafruit_QDTech.cpp
Changes
| Revision | Date | Who | Commit message |
|---|---|---|---|
| 3:6c3a23e87409 | 2014-11-19 | daneast | Add support for S6D02A1 controller.; Works fine with 20 MHz SPI.; Use 1k resistors in series on all logic lines. |
| 2:18ecda534e06 | 2014-03-03 | SomeRandomBloke | reduced SPI speed to 4MHz |
| 1:226fd3534967 | 2013-08-15 | SomeRandomBloke | Updates to GFX constructor |
| 0:99ee879ef5a9 | 2013-03-26 | SomeRandomBloke | new commit; |