Horizontal = Page

[NedEisele]

Hello,
I have a ssd1309 and I try using your library. However, it doesn't really works for me. When I do the function Fill(White) i have only a Line on the left and when I do TestCircle() I only have half of circles. They are uncomplete. After multiples test I've figured something is wrong with the Init().

I tried doing my own version do just show a pixel as bellow:
uint8_t tab [16]={0}; //Initialisation tableau
/for (int i=0;i<16;i++){
tab[i]=0xFF;
}/
tab[4]=2; //après test 1= rien,0= rien,3=glitch vsiblement 2 marche

ssd1306_WriteCommand(0xB0); //adresse de la page
ssd1306_WriteCommand(0x00); // valeur byte bas
ssd1306_WriteCommand(0x10); //byte haut
ssd1306_WriteData(tab,128); //

/*ssd1306_WriteCommand(0x8D); // Charge Pump Setting
ssd1306_WriteCommand(0x14); // Enable charge pump
ssd1306_WriteCommand(0xC8);*/
ssd1306_WriteCommand(0x20); //Set Memory Addressing Mode
ssd1306_WriteCommand(0x00); //0x00=Horizontal,0x01=Vertical,0x02=Page


ssd1306_WriteCommand(0xA4); // Lecture Ram




ssd1306_WriteCommand(0xAF); //

SSD1306.CurrentX = 0;
SSD1306.CurrentY = 0;

SSD1306.Initialized = 1;

and when i do x00 for Horizontal after the memory x20 it give me the same result as x02, which is a page. Only x01 work as it should. This is I think where my problem is

[afiskon]

Many thanks for your report.

Yes, these displays can be a little finicky. Some manufacturers claim their displays are for instance SSD1309 but the are in fact SSD1309-compatible to some extent. I don't know whether your display was the right one and mine was wrong or vice versa.

Unfortunatelly changing Init() may or may not break the displays it worked with before. Personally I tested in on a dozen or so. Considering the fact that your report seems to be the only one I got in many years (since 2018) I would rather keep the code as is. Anyone who encounters a similar issue can always modify Init() for a particular device, as you did.

Considering all the above I don't think there are any actionable items.