ST7789 Driver - Flickering display?

[daffodilistic]

Hi,

I have a ST7789 display paired with an ESP8266 chip. I managed to reverse-engineer the pin numbers required to display text based on the example code in the TFT_eSPI repository, but there seems to be an issue keeping the display "on" while my code runs, I'm not sure if it's a pin configuration problem, or code problem, as it seems to be related to my delay(1) call. If I increase the amount of time provided to the delay() call it flickers more.

My code and display config settings (in platformio.ini) is located in this GitHub repository: https://github.com/daffodilistic/esp8266_nixie