Once receiving LCDs I realized that the pinout printed on silkscreen had:
This got me confused because A0 and SDA are I2C standard terms but SCK is SPI term?
Engineering (Reverse):Here is my attempt to reverse engineer the two LCDs:
After some some reverse engineering on two different types of modules and going through the LCD datasheet I realized that the connections map as below:
LCD - Bus / Meaning
Vcc - Vcc
Gnd - Gnd
CS - CS (Chip Select)
Reset - Reset (Module Reset)
A0 - D/C (Data / Command)
SDA - MOSI (Master Out Slave In) SPI
SCK - SCK (Serial Clock) SPI
LED - LED Backlight +V (~3v - use a current limit resistor)
I tested one of the LCD using an Arduino compatible system and it worked fine. The other one still needs to be tested. I may have destroyed my modules during RE so take care when you go on a similar quest.