I2C timeout with OLED display on Pico

You could try this:

var exports = {};

var C = {
 OLED_CMD                   : 0x80,
 OLED_WIDTH                 : 128,
 OLED_HEIGHT                : 64
};

// export
exports.connect = function(spi, dc, callback) {
 var oled = Graphics.createArrayBuffer(128,64,1,{ver­tical_byte : true});
 var w = function(c,d) {
   digitalWrite(dc,0);
   spi.write(c);
   digitalWrite(dc,1);
   spi.write(c);
 };
 var extVcc=false;
 
 // configure the OLED
 digitalWrite(dc,0);// command
 spi.write([ 0xAe, // disp off
             0xD5, // clk div
             0x80, // suggested ratio
             0xA8, C.OLED_HEIGHT-1, // set multiplex
             0xD3,0x0, // display offset
             0x40, // start line
             0x8D,extVcc?0x10:0x14, // charge pump
             0x20,0x0, // memory mode
             0xA1, // seg remap 1
             0xC8, // comscandec
             0xDA,0x12, // set compins
             0x81,extVcc?0x9F:0xCF, // set contrast
             0xD9,extVcc?0x22:0xF1, // set precharge
             0xDb,0x40, // set vcom detect
             0xA4, // display all on
             0xA6, // display normal (non-inverted)
             0xAf // disp on
            ]);
   digitalWrite(dc,1);// data
 
 // if there is a callback, call it now(ish)
 if (callback !== undefined) setTimeout(callback, 10);
  
 // write to the screen
 oled.flip = function() { 
   // set how the data is to be sent (whole screen)
   digitalWrite(dc,0);// command
   spi.write([0x21, // columns
     0, C.OLED_WIDTH-1,
     0x22, // rows
     0, 7]);
   digitalWrite(dc,1);// data
   spi.write(this.buffer);
  };
 
 // return graphics
 return oled;
};



B3.reset(); // GND
B4.set(); // VCC

digitalPulse(B7,0,10); // Reset

setTimeout(function() {
  var s = new SPI();
  s.setup({mosi: B6 /* D1 */, sck:B5 /* D0 */});
  var g = exports.connect(s, A8 /* DC */, function(){
   // write some text
   g.drawString("Hello World!",2,2);
   // write to the screen
   g.flip(); 
  }
 );
},50);

Just gave it a go and it seems to work. I'll have a go at tidying it up into a general purpose I2C+SPI module - I shamelessly copied the magic initialisation incantation from Adafruit and it seems to work - looks like some oleds needed more setup than I was giving them