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olikraus / u8g2

U8glib library for monochrome displays, version 2
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strange gfx issue with esp8266 #1874

Closed pike2k closed 1 year ago

pike2k commented 2 years ago

I have a project where I had an odd Esp8266 that took 7-12Vin and did not work with 5V except for USB. It was was marked LoLin NodeMCU v3.

This ESP8266 had no gfx issue

I then replaced this with a different model of a unit marked (you guessed it) LoLin NodeMCU v3. This unit however does NOT take 12V on Vin (magic smoke). It does however work with 5V applied to Vin (I had more units). This 5V unit however has 1 or maybe 2,3 "stuck" pixels down in the right corner. If I swith to a different Oled (these are 128x32 btw) it shows a similar issue.

This is the line I use: U8G2_SH1106_128X32_VISIONOX_F_HW_I2C oled(U8G2_R2, / reset=/ U8X8_PIN_NONE);

Is it known that different ESP8266 running same code produces different output with u8g2? Any way around this gfx glitch?

pike2k commented 2 years ago

Addendum. Today the issue is not present on the same ESP8266 which showed the issue yesterday.

olikraus commented 2 years ago

so we can close this issue?

pike2k commented 2 years ago

Sadly this issue is random and comes and goes. I have not yet found a common thread :(

olikraus commented 2 years ago

Maybe communication is instable. Did you ever try software emulated I2C with u8g2?