Flickering 2.0 about ssd1306ascii HOT 4 CLOSED

The SSD1306 has no clear command so a 128x32 display requires writing 512 bytes to display memory.

This take about 24 ms with 400 kHz I2C so your program shows extreme flickering.

The SSD1306 runs at a fairly slow refresh rate so this contributes to the flicker.

from ssd1306ascii.

I tried a SPI 128x32 display. It does a clear in about 4 ms. I use 8 MHz SPI clock.

Flicker is much better. This loop is fairly good with the 10 ms delay.

void loop() {
    oled.clear(); 
    oled.print("flicker");
    delay(10);
  }

from ssd1306ascii.

I have the same issue. Adafruit library doesn't have flickering at all. At they write to some buffer (I guess) and then show the updated screen by the display() command.
I liked this library for its very small amount of consumed memory. But with this issue I don't see a way to use it in practice.

from ssd1306ascii.

Clearing the entire display causes flickering.

This is why the Adafruit library has less flicker. The Adafruit library doesn't clear areas that have not changed, it rewrites these areas with the same data.

If you selectively rewrite only areas that are modified there will be less flickering.

from ssd1306ascii.