Pmod oled contrast setting

[Brooklynoutlier]

The oledinit.vhd file in the resources section for pmod oled seems to use a very low setting for initializing display contrast: 0fh vs. the RESET default, 7fh. Is this because the display is being driven off the 3.3v line from my Arty S7 board? Has anyone else successfully set it higher without letting the magic smoke out of some part of board/add-on?

[JColvin]

Hi @Brooklynoutlier,

I'm not certain why the oledinit.vhd for the Nexys 3 or the Pmod OLED IP OledDriver.c file sets the display contrast at 0x0F rather than the default of 0x7F. The microcontroller code (also at 3.3V) maintains the reset value of 0x7F, so you should be able to adjust the display contrast to a different value than 0x0F without any issues.

Let me know if you have any questions.

Thanks,
JColvin