Got a new Pi Pico and it looks very promising. Want to use Oled display with it. 


Tried out SSD1306 Oled display first on Arduino. This worked with code below. Then went and tried out Pi Pico for Hello World, blink etc.

Here the Pico is going through the Arduino Oled display program.


/**************************************************************************

 This is an example for our Monochrome OLEDs based on SSD1306 drivers


 Pick one up today in the adafruit shop!

 ------> http://www.adafruit.com/category/63_98


 This example is for a 128x32 pixel display using I2C to communicate

 3 pins are required to interface (two I2C and one reset).


 Adafruit invests time and resources providing this open

 source code, please support Adafruit and open-source

 hardware by purchasing products from Adafruit!


 Written by Limor Fried/Ladyada for Adafruit Industries,

 with contributions from the open source community.

 BSD license, check license.txt for more information

 All text above, and the splash screen below must be

 included in any redistribution.

 **************************************************************************/


#include <SPI.h>

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>


#define SCREEN_WIDTH 128 // OLED display width, in pixels

#define SCREEN_HEIGHT 32 // OLED display height, in pixels


// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)

// The pins for I2C are defined by the Wire-library. 

// On an arduino UNO:       A4(SDA), A5(SCL)

// On an arduino MEGA 2560: 20(SDA), 21(SCL)

// On an arduino LEONARDO:   2(SDA),  3(SCL), ...

#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)

#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


#define NUMFLAKES     10 // Number of snowflakes in the animation example


#define LOGO_HEIGHT   16

#define LOGO_WIDTH    16

static const unsigned char PROGMEM logo_bmp[] =

{ 0b00000000, 0b11000000,

  0b00000001, 0b11000000,

  0b00000001, 0b11000000,

  0b00000011, 0b11100000,

  0b11110011, 0b11100000,

  0b11111110, 0b11111000,

  0b01111110, 0b11111111,

  0b00110011, 0b10011111,

  0b00011111, 0b11111100,

  0b00001101, 0b01110000,

  0b00011011, 0b10100000,

  0b00111111, 0b11100000,

  0b00111111, 0b11110000,

  0b01111100, 0b11110000,

  0b01110000, 0b01110000,

  0b00000000, 0b00110000 };


void setup() {

  Serial.begin(9600);


  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally

  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {

    Serial.println(F("SSD1306 allocation failed"));

    for(;;); // Don't proceed, loop forever

  }


  // Show initial display buffer contents on the screen --

  // the library initializes this with an Adafruit splash screen.

  display.display();

  delay(2000); // Pause for 2 seconds


  // Clear the buffer

  display.clearDisplay();


  // Draw a single pixel in white

  display.drawPixel(10, 10, SSD1306_WHITE);


  // Show the display buffer on the screen. You MUST call display() after

  // drawing commands to make them visible on screen!

  display.display();

  delay(2000);

  // display.display() is NOT necessary after every single drawing command,

  // unless that's what you want...rather, you can batch up a bunch of

  // drawing operations and then update the screen all at once by calling

  // display.display(). These examples demonstrate both approaches...


  testdrawline();      // Draw many lines


  testdrawrect();      // Draw rectangles (outlines)


  testfillrect();      // Draw rectangles (filled)


  testdrawcircle();    // Draw circles (outlines)


  testfillcircle();    // Draw circles (filled)


  testdrawroundrect(); // Draw rounded rectangles (outlines)


  testfillroundrect(); // Draw rounded rectangles (filled)


  testdrawtriangle();  // Draw triangles (outlines)


  testfilltriangle();  // Draw triangles (filled)


  testdrawchar();      // Draw characters of the default font


  testdrawstyles();    // Draw 'stylized' characters


  testscrolltext();    // Draw scrolling text


  testdrawbitmap();    // Draw a small bitmap image


  // Invert and restore display, pausing in-between

  display.invertDisplay(true);

  delay(1000);

  display.invertDisplay(false);

  delay(1000);


  testanimate(logo_bmp, LOGO_WIDTH, LOGO_HEIGHT); // Animate bitmaps

}


void loop() {

}


void testdrawline() {

  int16_t i;


  display.clearDisplay(); // Clear display buffer


  for(i=0; i<display.width(); i+=4) {

    display.drawLine(0, 0, i, display.height()-1, SSD1306_WHITE);

    display.display(); // Update screen with each newly-drawn line

    delay(1);

  }

  for(i=0; i<display.height(); i+=4) {

    display.drawLine(0, 0, display.width()-1, i, SSD1306_WHITE);

    display.display();

    delay(1);

  }

  delay(250);


  display.clearDisplay();


  for(i=0; i<display.width(); i+=4) {

    display.drawLine(0, display.height()-1, i, 0, SSD1306_WHITE);

    display.display();

    delay(1);

  }

  for(i=display.height()-1; i>=0; i-=4) {

    display.drawLine(0, display.height()-1, display.width()-1, i, SSD1306_WHITE);

    display.display();

    delay(1);

  }

  delay(250);


  display.clearDisplay();


  for(i=display.width()-1; i>=0; i-=4) {

    display.drawLine(display.width()-1, display.height()-1, i, 0, SSD1306_WHITE);

    display.display();

    delay(1);

  }

  for(i=display.height()-1; i>=0; i-=4) {

    display.drawLine(display.width()-1, display.height()-1, 0, i, SSD1306_WHITE);

    display.display();

    delay(1);

  }

  delay(250);


  display.clearDisplay();


  for(i=0; i<display.height(); i+=4) {

    display.drawLine(display.width()-1, 0, 0, i, SSD1306_WHITE);

    display.display();

    delay(1);

  }

  for(i=0; i<display.width(); i+=4) {

    display.drawLine(display.width()-1, 0, i, display.height()-1, SSD1306_WHITE);

    display.display();

    delay(1);

  }


  delay(2000); // Pause for 2 seconds

}


void testdrawrect(void) {

  display.clearDisplay();


  for(int16_t i=0; i<display.height()/2; i+=2) {

    display.drawRect(i, i, display.width()-2*i, display.height()-2*i, SSD1306_WHITE);

    display.display(); // Update screen with each newly-drawn rectangle

    delay(1);

  }


  delay(2000);

}


void testfillrect(void) {

  display.clearDisplay();


  for(int16_t i=0; i<display.height()/2; i+=3) {

    // The INVERSE color is used so rectangles alternate white/black

    display.fillRect(i, i, display.width()-i*2, display.height()-i*2, SSD1306_INVERSE);

    display.display(); // Update screen with each newly-drawn rectangle

    delay(1);

  }


  delay(2000);

}


void testdrawcircle(void) {

  display.clearDisplay();


  for(int16_t i=0; i<max(display.width(),display.height())/2; i+=2) {

    display.drawCircle(display.width()/2, display.height()/2, i, SSD1306_WHITE);

    display.display();

    delay(1);

  }


  delay(2000);

}


void testfillcircle(void) {

  display.clearDisplay();


  for(int16_t i=max(display.width(),display.height())/2; i>0; i-=3) {

    // The INVERSE color is used so circles alternate white/black

    display.fillCircle(display.width() / 2, display.height() / 2, i, SSD1306_INVERSE);

    display.display(); // Update screen with each newly-drawn circle

    delay(1);

  }


  delay(2000);

}


void testdrawroundrect(void) {

  display.clearDisplay();


  for(int16_t i=0; i<display.height()/2-2; i+=2) {

    display.drawRoundRect(i, i, display.width()-2*i, display.height()-2*i,

      display.height()/4, SSD1306_WHITE);

    display.display();

    delay(1);

  }


  delay(2000);

}


void testfillroundrect(void) {

  display.clearDisplay();


  for(int16_t i=0; i<display.height()/2-2; i+=2) {

    // The INVERSE color is used so round-rects alternate white/black

    display.fillRoundRect(i, i, display.width()-2*i, display.height()-2*i,

      display.height()/4, SSD1306_INVERSE);

    display.display();

    delay(1);

  }


  delay(2000);

}


void testdrawtriangle(void) {

  display.clearDisplay();


  for(int16_t i=0; i<max(display.width(),display.height())/2; i+=5) {

    display.drawTriangle(

      display.width()/2  , display.height()/2-i,

      display.width()/2-i, display.height()/2+i,

      display.width()/2+i, display.height()/2+i, SSD1306_WHITE);

    display.display();

    delay(1);

  }


  delay(2000);

}


void testfilltriangle(void) {

  display.clearDisplay();


  for(int16_t i=max(display.width(),display.height())/2; i>0; i-=5) {

    // The INVERSE color is used so triangles alternate white/black

    display.fillTriangle(

      display.width()/2  , display.height()/2-i,

      display.width()/2-i, display.height()/2+i,

      display.width()/2+i, display.height()/2+i, SSD1306_INVERSE);

    display.display();

    delay(1);

  }


  delay(2000);

}


void testdrawchar(void) {

  display.clearDisplay();


  display.setTextSize(1);      // Normal 1:1 pixel scale

  display.setTextColor(SSD1306_WHITE); // Draw white text

  display.setCursor(0, 0);     // Start at top-left corner

  display.cp437(true);         // Use full 256 char 'Code Page 437' font


  // Not all the characters will fit on the display. This is normal.

  // Library will draw what it can and the rest will be clipped.

  for(int16_t i=0; i<256; i++) {

    if(i == '\n') display.write(' ');

    else          display.write(i);

  }


  display.display();

  delay(2000);

}


void testdrawstyles(void) {

  display.clearDisplay();


  display.setTextSize(1);             // Normal 1:1 pixel scale

  display.setTextColor(SSD1306_WHITE);        // Draw white text

  display.setCursor(0,0);             // Start at top-left corner

  display.println(F("Hello, world!"));


  display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text

  display.println(3.141592);


  display.setTextSize(2);             // Draw 2X-scale text

  display.setTextColor(SSD1306_WHITE);

  display.print(F("0x")); display.println(0xDEADBEEF, HEX);


  display.display();

  delay(2000);

}


void testscrolltext(void) {

  display.clearDisplay();


  display.setTextSize(2); // Draw 2X-scale text

  display.setTextColor(SSD1306_WHITE);

  display.setCursor(10, 0);

  display.println(F("skkcroll"));

  display.display();      // Show initial text

  delay(100);


  // Scroll in various directions, pausing in-between:

  display.startscrollright(0x00, 0x0F);

  delay(2000);

  display.stopscroll();

  delay(1000);

  display.startscrollleft(0x00, 0x0F);

  delay(2000);

  display.stopscroll();

  delay(1000);

  display.startscrolldiagright(0x00, 0x07);

  delay(2000);

  display.startscrolldiagleft(0x00, 0x07);

  delay(2000);

  display.stopscroll();

  delay(1000);

}


void testdrawbitmap(void) {

  display.clearDisplay();


  display.drawBitmap(

    (display.width()  - LOGO_WIDTH ) / 2,

    (display.height() - LOGO_HEIGHT) / 2,

    logo_bmp, LOGO_WIDTH, LOGO_HEIGHT, 1);

  display.display();

  delay(1000);

}


#define XPOS   0 // Indexes into the 'icons' array in function below

#define YPOS   1

#define DELTAY 2


void testanimate(const uint8_t *bitmap, uint8_t w, uint8_t h) {

  int8_t f, icons[NUMFLAKES][3];


  // Initialize 'snowflake' positions

  for(f=0; f< NUMFLAKES; f++) {

    icons[f][XPOS]   = random(1 - LOGO_WIDTH, display.width());

    icons[f][YPOS]   = -LOGO_HEIGHT;

    icons[f][DELTAY] = random(1, 6);

    Serial.print(F("x: "));

    Serial.print(icons[f][XPOS], DEC);

    Serial.print(F(" y: "));

    Serial.print(icons[f][YPOS], DEC);

    Serial.print(F(" dy: "));

    Serial.println(icons[f][DELTAY], DEC);

  }


  for(;;) { // Loop forever...

    display.clearDisplay(); // Clear the display buffer


    // Draw each snowflake:

    for(f=0; f< NUMFLAKES; f++) {

      display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, SSD1306_WHITE);

    }


    display.display(); // Show the display buffer on the screen

    delay(200);        // Pause for 1/10 second


    // Then update coordinates of each flake...

    for(f=0; f< NUMFLAKES; f++) {

      icons[f][YPOS] += icons[f][DELTAY];

      // If snowflake is off the bottom of the screen...

      if (icons[f][YPOS] >= display.height()) {

        // Reinitialize to a random position, just off the top

        icons[f][XPOS]   = random(1 - LOGO_WIDTH, display.width());

        icons[f][YPOS]   = -LOGO_HEIGHT;

        icons[f][DELTAY] = random(1, 6);

      }

    }

  }

}


 

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