ESP8266 ESP-12E nodemcu V1.0 OLED Display SPI mode using U8Glib

After several days of struggle...finally managed to get 4 pin SPI OLED display running on ESP8266 ESP-12 nodemcu dev kit V1.0, without Arduino IDE Final working code available on my blog- Programming IDE - esplorer available at- Graphics library U8glib available at- Followed pin out guidelines from- I have done following pin connections between ESP8266-12E and SPI OLED display -- D3 pin of ESP to RES pin of Display -- D4 pin of ESP to DC pin of Display -- D5 pin of ESP to SCL pin of Display Hardware SPI CLK = GPIO14 -- D7 pin of ESP to SDA pin of Display Hardware SPI MOSI = GPIO13 Note- I dont get any royalty from banggood for these projects, I mention this because it makes easy for you all to understand exactly which make electronic device I am using and how to make it work :). Nodemcu- ESP8266-E12 Dev kit Display- 0.96 inch 4 pin SPI OLED display with 64x128 resolution (The link shows I2C but practically they sell SPI OLED) Please note, the display arrived with pin markings that are different than those shown on their website. Have fun... comments for improvement in code and video are most welcomed.