Can't display on Adafruit SSD1107 64x128 display

[alexstratford]

Hi,

I'm trying to connect to Adafruit's Feather OLED display: https://www.adafruit.com/product/4650, I saw a few others on here had managed it, and I've not had any luck so far, despite trying this constructor, the SEEED, and Pimoroni 128x128 ones, and the generic 128x128 one.

Can you help point out what I'm doing wrong or help me work out why its not working? (I'm not using Adafruit's library as I plan to port this over to a much smaller screen, which doesn't have the memory required to support it)

Here's the test code I'm using (It should just open the serial comms, spit out the text, attempt to fill the screen 4 pixels at a time, from 0 to 128 in each axis to avoid rotation issues, spit out the time since boot, then stop):

#include <Wire.h>
#include <U8g2lib.h>

#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
U8G2_SH1107_64X128_F_HW_I2C u8g2(U8G2_R0, D5);


void setup() {
  Serial.begin(115200);
  while (!Serial) {}
  Serial.print("Opened Serial Comms");
  delay(1000);
  // put your setup code here, to run once:
  initScreen();
  displayInfo();
  Serial.printf("Milliseconds since start: %ld\n", millis());
  Serial.end();
}

void loop() {
  ///displayInfo();
}

void initScreen(void) {
  u8g2.setI2CAddress(SCREEN_ADDRESS);
  if(!u8g2.begin()) {
    Serial.print("Cannot allocate screen buffer, available space: ");
    Serial.print(freeRam());
    Serial.println(" bytes");
    Serial.end();
    for(;;); // Don't proceed, loop forever
  }
  Wire.beginTransmission(SCREEN_ADDRESS);
  if (Wire.endTransmission() != 0) {
    Serial.print("SH1107 not connected at: ");
    Serial.println(SCREEN_ADDRESS);
    Serial.end();
    for(;;); // Don't proceed, loop forever
  }
  Serial.println("Screen Initialised");
  u8g2.clearBuffer();
  u8g2.sendBuffer();
}


void displayInfo(void) {
  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_ncenB08_tr);
  u8g2.setDrawColor(0);
  u8g2.print("Hello World");
  for (int x = 0; x<128; x=x+4) {
    for (int y = 0; y<128; y=y+4) {
      u8g2.drawBox(x,y,4,4);
      u8g2.sendBuffer();
      Serial.printf("%ld,%ld\n", x, y);
    }
  }  
}

int freeRam() {
  extern int __heap_start, *__brkval;
  int v;
  return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
}

[olikraus]

use

u8g2.setI2CAddress(SCREEN_ADDRESS*2);

See also: https://github.com/olikraus/u8g2/wiki/u8g2reference#seti2caddress